Fixed PDSCH UE example. Added ue_dl and ue_sync modules. Fixed other minor bugs

CMakeLists.txt

@@ -77,7 +77,10 @@ IF(CMAKE_COMPILER_IS_GNUCXX)
 ENDIF(CMAKE_COMPILER_IS_GNUCXX)
 
 IF(CMAKE_COMPILER_IS_GNUCC)
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror -Wall -Wno-format-extra-args -Winline -Wno-unused-result -Wno-format -std=c99 -D_GNU_SOURCE")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wno-format-extra-args -Winline -Wno-unused-result -Wno-format -std=c99 -D_GNU_SOURCE")
+   # IF(${CMAKE_BUILD_TYPE} STREQUAL "Debug")
+   #   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror -Wno-error=implicit-function-declaration -Wno-error=unused-but-set-variable")
+   # ENDIF(${CMAKE_BUILD_TYPE} STREQUAL "Debug")
     IF(NOT WIN32)
         ADD_CXX_COMPILER_FLAG_IF_AVAILABLE(-fvisibility=hidden HAVE_VISIBILITY_HIDDEN)
     ENDIF(NOT WIN32)

cmake/modules/FindVolk.cmake

@@ -25,16 +25,35 @@ FIND_LIBRARY(
 )
 
 # Some functions are not defined in old volk versions
-SET(CMAKE_REQUIRED_LIBRARIES volk m)	
+SET(CMAKE_REQUIRED_LIBRARIES ${VOLK_LIBRARIES} m)
 CHECK_FUNCTION_EXISTS_MATH(volk_32f_index_max_16u HAVE_VOLK_MAX_FUNCTION)
 CHECK_FUNCTION_EXISTS_MATH(volk_32f_accumulator_s32f HAVE_VOLK_ACC_FUNCTION)
 CHECK_FUNCTION_EXISTS_MATH(volk_32fc_s32fc_multiply_32fc HAVE_VOLK_MULT_FUNCTION)
 CHECK_FUNCTION_EXISTS_MATH(volk_32fc_conjugate_32fc HAVE_VOLK_CONJ_FUNCTION)
 CHECK_FUNCTION_EXISTS_MATH(volk_32fc_x2_multiply_32fc HAVE_VOLK_MULT2_FUNCTION)
+CHECK_FUNCTION_EXISTS_MATH(volk_32fc_32f_multiply_32fc HAVE_VOLK_MULT_REAL_FUNCTION)
+CHECK_FUNCTION_EXISTS_MATH(volk_32f_s32f_multiply_32f HAVE_VOLK_MULT_FLOAT_FUNCTION)
 CHECK_FUNCTION_EXISTS_MATH(volk_32fc_magnitude_32f HAVE_VOLK_MAG_FUNCTION)
+CHECK_FUNCTION_EXISTS_MATH(volk_32f_x2_divide_32f HAVE_VOLK_DIVIDE_FUNCTION)
+CHECK_FUNCTION_EXISTS_MATH(volk_32fc_32f_dot_prod_32fc HAVE_VOLK_DOTPROD_FC_FUNCTION)
+CHECK_FUNCTION_EXISTS_MATH(volk_32f_x2_dot_prod_32f HAVE_VOLK_DOTPROD_F_FUNCTION)
+CHECK_FUNCTION_EXISTS_MATH(volk_32fc_s32f_atan2_32f HAVE_VOLK_ATAN_FUNCTION)
+CHECK_FUNCTION_EXISTS_MATH(volk_32f_s32f_convert_16i HAVE_VOLK_CONVERT_FI_FUNCTION)
+CHECK_FUNCTION_EXISTS_MATH(volk_32fc_deinterleave_32f_x2 HAVE_VOLK_DEINTERLEAVE_FUNCTION)
+
+CHECK_FUNCTION_EXISTS_MATH(volk_32f_x2_subtract_32f HAVE_VOLK_SUB_FLOAT_FUNCTION)
 
 
 SET(VOLK_DEFINITIONS "HAVE_VOLK")
+IF(${HAVE_VOLK_SUB_FLOAT_FUNCTION})
+  SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_SUB_FLOAT_FUNCTION")
+ENDIF()
+IF(${HAVE_VOLK_DEINTERLEAVE_FUNCTION})
+  SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_DEINTERLEAVE_FUNCTION")
+ENDIF()
+IF(${HAVE_VOLK_CONVERT_FI_FUNCTION})
+  SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_CONVERT_FI_FUNCTION")
+ENDIF()
 IF(${HAVE_VOLK_MAX_FUNCTION})
   SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_MAX_FUNCTION")
 ENDIF()
@@ -50,10 +69,27 @@ ENDIF()
 IF(${HAVE_VOLK_MULT2_FUNCTION})
   SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_MULT2_FUNCTION")
 ENDIF()
+IF(${HAVE_VOLK_MULT_FLOAT_FUNCTION})
+  SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_MULT_FLOAT_FUNCTION")
+ENDIF()
+IF(${HAVE_VOLK_MULT_REAL_FUNCTION})
+  SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_MULT_REAL_FUNCTION")
+ENDIF()
 IF(${HAVE_VOLK_MAG_FUNCTION})
   SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_MAG_FUNCTION")
 ENDIF()
-
+IF(${HAVE_VOLK_DIVIDE_FUNCTION})
+  SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_DIVIDE_FUNCTION")
+ENDIF()
+IF(${HAVE_VOLK_DOTPROD_FC_FUNCTION})
+  SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_DOTPROD_FC_FUNCTION")
+ENDIF()
+IF(${HAVE_VOLK_DOTPROD_F_FUNCTION})
+  SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_DOTPROD_F_FUNCTION")
+ENDIF()
+IF(${HAVE_VOLK_ATAN_FUNCTION})
+  SET(VOLK_DEFINITIONS "${VOLK_DEFINITIONS}; HAVE_VOLK_ATAN_FUNCTION")
+ENDIF()
 INCLUDE(FindPackageHandleStandardArgs)
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(VOLK DEFAULT_MSG VOLK_LIBRARIES VOLK_INCLUDE_DIRS)
 MARK_AS_ADVANCED(VOLK_LIBRARIES VOLK_INCLUDE_DIRS VOLK_DEFINITIONS)

cuhd/include/liblte/cuhd/cuhd.h

@@ -31,26 +31,63 @@
 extern "C" {
 #endif
 #include <stdbool.h>
+#include <stdint.h>
   
 #include "liblte/config.h"
 #include "liblte/cuhd/cuhd_utils.h"
 
-LIBLTE_API int cuhd_open(char *args, void **handler);
+LIBLTE_API int cuhd_open(char *args, 
+                         void **handler);
+
 LIBLTE_API int cuhd_close(void *h);
 
 LIBLTE_API int cuhd_start_rx_stream(void *h);
-LIBLTE_API int cuhd_start_rx_stream_nsamples(void *h, int nsamples);
+
+LIBLTE_API int cuhd_start_rx_stream_nsamples(void *h, 
+                                             uint32_t nsamples);
+
 LIBLTE_API int cuhd_stop_rx_stream(void *h);
+
 LIBLTE_API bool cuhd_rx_wait_lo_locked(void *h);
-LIBLTE_API double cuhd_set_rx_srate(void *h, double freq);
+
-LIBLTE_API double cuhd_set_rx_gain(void *h, double gain);
+LIBLTE_API double cuhd_set_rx_srate(void *h, 
-LIBLTE_API double cuhd_set_rx_freq(void *h, double freq);
+                                    double freq);
-LIBLTE_API int cuhd_recv(void *h, void *data, int nsamples, int blocking);
+
-
+LIBLTE_API double cuhd_set_rx_gain(void *h, 
-LIBLTE_API double cuhd_set_tx_srate(void *h, double freq);
+                                   double gain);
-LIBLTE_API double cuhd_set_tx_gain(void *h, double gain);
+
-LIBLTE_API double cuhd_set_tx_freq(void *h, double freq);
+LIBLTE_API double cuhd_set_rx_freq(void *h, 
-LIBLTE_API int cuhd_send(void *h, void *data, int nsamples, int blocking);
+                                   double freq);
+
+LIBLTE_API double cuhd_set_rx_freq_offset(void *h, 
+                                          double freq, 
+                                          double off);
+
+LIBLTE_API int cuhd_recv(void *h, 
+                         void *data, 
+                         uint32_t nsamples, 
+                         bool blocking);
+
+LIBLTE_API int cuhd_recv_timed(void *h,
+                    void *data,
+                    uint32_t nsamples,
+                    bool blocking,
+                    time_t *secs,
+                    double *frac_secs);
+
+LIBLTE_API double cuhd_set_tx_srate(void *h, 
+                                    double freq);
+
+LIBLTE_API double cuhd_set_tx_gain(void *h, 
+                                   double gain);
+
+LIBLTE_API double cuhd_set_tx_freq(void *h,
+                                   double freq);
+
+LIBLTE_API int cuhd_send(void *h, 
+                         void *data, 
+                         uint32_t nsamples, 
+                         bool blocking);
 
 
 #ifdef __cplusplus

cuhd/lib/cuhd_imp.cpp

@@ -35,7 +35,8 @@
 #include "liblte/cuhd/cuhd.h"
 
 
-void my_handler(uhd::msg::type_t type, const std::string &msg){
+void my_handler(uhd::msg::type_t type, const std::string & msg)
+{
   //handle the message...
 }
 
@@ -46,15 +47,17 @@ typedef _Complex float complex_t;
 bool isLocked(void *h)
 {
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
-   std::vector<std::string> mb_sensors = handler->usrp->get_mboard_sensor_names();
+  std::vector < std::string > mb_sensors =
-   std::vector<std::string> rx_sensors = handler->usrp->get_rx_sensor_names(0);
+    handler->usrp->get_mboard_sensor_names();
-   if(std::find(rx_sensors.begin(), rx_sensors.end(), "lo_locked") != rx_sensors.end()) {
+  std::vector < std::string > rx_sensors =
+    handler->usrp->get_rx_sensor_names(0);
+  if (std::find(rx_sensors.begin(), rx_sensors.end(), "lo_locked") !=
+      rx_sensors.end()) {
     return handler->usrp->get_rx_sensor("lo_locked", 0).to_bool();
-   }
+  } else if (std::find(mb_sensors.begin(), mb_sensors.end(), "ref_locked") !=
-   else if(std::find(mb_sensors.begin(), mb_sensors.end(), "ref_locked") != mb_sensors.end()) {
+             mb_sensors.end()) {
     return handler->usrp->get_mboard_sensor("ref_locked", 0).to_bool();
-   }
+  } else {
-   else {
     usleep(500);
     return true;
   }
@@ -64,15 +67,15 @@ bool cuhd_rx_wait_lo_locked(void *h)
 {
 
   double report = 0.0;
-     while(isLocked(h) && report < 3.0)
+  while (isLocked(h) && report < 3.0) {
-     {
     report += 0.1;
     usleep(1000);
   }
   return isLocked(h);
 }
 
-int cuhd_start_rx_stream(void *h) {
+int cuhd_start_rx_stream(void *h)
+{
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
   uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
   cmd.time_spec = handler->usrp->get_time_now();
@@ -81,7 +84,8 @@ int cuhd_start_rx_stream(void *h) {
   return 0;
 }
 
-int cuhd_stop_rx_stream(void *h) {
+int cuhd_stop_rx_stream(void *h)
+{
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
   uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
   cmd.time_spec = handler->usrp->get_time_now();
@@ -90,7 +94,8 @@ int cuhd_stop_rx_stream(void *h) {
   return 0;
 }
 
-int cuhd_start_rx_stream_nsamples(void *h, int nsamples) {
+int cuhd_start_rx_stream_nsamples(void *h, uint32_t nsamples)
+{
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
   uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_MORE);
   cmd.time_spec = handler->usrp->get_time_now();
@@ -100,13 +105,11 @@ int cuhd_start_rx_stream_nsamples(void *h, int nsamples) {
   return 0;
 }
 
-int cuhd_open(char *args, void **h) {
+int cuhd_open(char *args, void **h)
+{
   cuhd_handler *handler = new cuhd_handler();
   std::string _args = std::string(args);
-	handler->usrp = uhd::usrp::multi_usrp::make(_args);
+  handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=30720000");
-
-	// Try to set LTE clock
-	handler->usrp->set_master_clock_rate(30720000);
 
   handler->usrp->set_clock_source("internal");
 
@@ -122,33 +125,44 @@ int cuhd_open(char *args, void **h) {
   return 0;
 }
 
-int cuhd_close(void *h) {
+int cuhd_close(void *h)
+{
   cuhd_stop_rx_stream(h);
         /** Something else to close the USRP?? */
   return 0;
 }
 
 
-double cuhd_set_rx_srate(void *h, double freq) {
+double cuhd_set_rx_srate(void *h, double freq)
+{
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
   handler->usrp->set_rx_rate(freq);
   double ret = handler->usrp->get_rx_rate();
   return ret;
 }
 
-double cuhd_set_rx_gain(void *h, double gain) {
+double cuhd_set_rx_gain(void *h, double gain)
+{
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
   handler->usrp->set_rx_gain(gain);
   return handler->usrp->get_rx_gain();
 }
 
-double cuhd_set_rx_freq(void *h, double freq) {
+double cuhd_set_rx_freq(void *h, double freq)
+{
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
   handler->usrp->set_rx_freq(freq);
   return handler->usrp->get_rx_freq();
 }
 
-int cuhd_recv(void *h, void *data, int nsamples, int blocking) {
+double cuhd_set_rx_freq_offset(void *h, double freq, double off) {
+  cuhd_handler* handler = static_cast<cuhd_handler*>(h);
+  handler->usrp->set_rx_freq(uhd::tune_request_t(freq,off));
+  return handler->usrp->get_rx_freq();
+}
+
+int cuhd_recv(void *h, void *data, uint32_t nsamples, bool blocking)
+{
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
   uhd::rx_metadata_t md;
   if (blocking) {
@@ -160,6 +174,9 @@ int cuhd_recv(void *h, void *data, int nsamples, int blocking) {
         return -1;
       }
       n += p;
+      if (md.error_code != uhd::rx_metadata_t::ERROR_CODE_NONE) {
+        std::cout << "\nError code: " << md.to_pp_string() << "\n\n";
+      }
     } while (n < nsamples);
     return nsamples;
   } else {
@@ -167,25 +184,64 @@ int cuhd_recv(void *h, void *data, int nsamples, int blocking) {
   }
 }
 
-double cuhd_set_tx_gain(void *h, double gain) {
+int cuhd_recv_timed(void *h,
+                    void *data,
+                    uint32_t nsamples,
+                    int blocking,
+                    time_t *secs,
+                    double *frac_secs) {
+  cuhd_handler* handler = static_cast<cuhd_handler*>(h);
+  uhd::rx_metadata_t md;
+  *secs = -1;
+  *frac_secs = -1;
+  int p;
+  if (blocking) {
+    int n=0;
+    complex_t *data_c = (complex_t*) data;
+    do {
+      p=handler->rx_stream->recv(&data_c[n], nsamples-n, md);
+      if (p == -1) {
+        return -1;
+      }
+      if(*secs < 0){
+        *secs = md.time_spec.get_full_secs();
+        *frac_secs = md.time_spec.get_frac_secs();
+      }
+      n+=p;
+    } while(n<nsamples);
+    return n;
+  } else {
+    p = handler->rx_stream->recv(data, nsamples, md, 0.0);
+    *secs = md.time_spec.get_full_secs();
+    *frac_secs = md.time_spec.get_frac_secs();
+    return p;
+  }
+}
+
+
+double cuhd_set_tx_gain(void *h, double gain)
+{
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
   handler->usrp->set_tx_gain(gain);
   return handler->usrp->get_tx_gain();
 }
 
-double cuhd_set_tx_srate(void *h, double freq) {
+double cuhd_set_tx_srate(void *h, double freq)
+{
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
   handler->usrp->set_tx_rate(freq);
   return handler->usrp->get_tx_rate();
 }
 
-double cuhd_set_tx_freq(void *h, double freq) {
+double cuhd_set_tx_freq(void *h, double freq)
+{
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
   handler->usrp->set_tx_freq(freq);
   return handler->usrp->get_tx_freq();
 }
 
-int cuhd_send(void *h, void *data, int nsamples, int blocking) {
+int cuhd_send(void *h, void *data, uint32_t nsamples, bool blocking)
+{
   cuhd_handler *handler = static_cast < cuhd_handler * >(h);
   uhd::tx_metadata_t md;
   if (blocking) {

lte/phy/examples/CMakeLists.txt

@@ -51,7 +51,7 @@ LIST(FIND OPTIONAL_LIBS graphics GRAPHICS_FIND)
 # These two can be compiled without UHD or graphics support
 #################################################################
 
-add_executable(pdsch_ue pdsch_ue.c)
+add_executable(pdsch_ue pdsch_ue.c iodev.c)
 target_link_libraries(pdsch_ue lte_phy)
 
 add_executable(pdsch_enodeb pdsch_enodeb.c)

lte/phy/examples/pdsch_enodeb.c

@@ -189,11 +189,13 @@ void base_init() {
     exit(-1);
   }
 
-  if (pdsch_init(&pdsch, 1234, cell)) {
+  if (pdsch_init(&pdsch, cell)) {
     fprintf(stderr, "Error creating PDSCH object\n");
     exit(-1);
   }
   
+  pdsch_set_rnti(&pdsch, 1234);
+  
   if (pdsch_harq_init(&harq_process, &pdsch)) {
     fprintf(stderr, "Error initiating HARQ process\n");
     exit(-1);
@@ -365,7 +367,7 @@ int main(int argc, char **argv) {
       } else {
 #ifndef DISABLE_UHD
         vec_sc_prod_cfc(output_buffer, uhd_amp, output_buffer, sf_n_samples);
-        cuhd_send(uhd, output_buffer, sf_n_samples, 1);
+        cuhd_send(uhd, output_buffer, sf_n_samples, true);
 #endif
       }
       nf++;

lte/phy/examples/pdsch_ue.c

@@ -37,83 +37,59 @@
 #include <signal.h>
 
 #include "liblte/phy/phy.h"
-
+#include "iodev.h"
-#ifndef DISABLE_UHD
-#include "liblte/cuhd/cuhd.h"
-void *uhd;
-#endif
 
 #ifndef DISABLE_GRAPHICS
-#include "liblte/graphics/plot.h"
+void init_plots();
-plot_real_t poutfft;
+void do_plots(ue_dl_t *q, uint32_t sf_idx);
-plot_complex_t pce;
-plot_scatter_t pscatrecv, pscatequal;
 #endif
 
-#define MHZ         1000000
-#define SAMP_FREQ   1920000
-
-#define NOF_PORTS 2
-
-float find_threshold = 9.0;
-int nof_frames = -1;
-int pkt_errors = 0, pkts_total = 0;
-int frame_cnt;
-char *input_file_name = NULL;
-int disable_plots = 0;
-
-/* These are the number of PRBs used during the SYNC procedure */
-int sampling_nof_prb = 6;
-
-/* Number of samples in a subframe */
-int sf_n_samples;
-
-lte_cell_t cell;
-
-uint32_t cell_id_file = 1;
-
-int cell_id_initated = 0, mib_initiated = 0;
-int frame_number; 
-
-bool pbch_only = false; 
-
 int go_exit = 0;
 
-float uhd_freq = 2600000000.0, uhd_gain = 20.0;
+/* Local function definitions */
-char *uhd_args = "";
+void init_plots();
-
+
-filesource_t fsrc;
+/**********************************************************************
-cf_t *input_buffer, *sf_buffer, *fft_buffer, *input_decim_buffer, *ce[MAX_PORTS];
+ *  Program arguments processing
-float *tmp_plot;
+ ***********************************************************************/
-pbch_t pbch;
+typedef struct {
-pcfich_t pcfich;
+  uint32_t cell_id_file;
-pdcch_t pdcch;
+  uint32_t nof_prb_file; 
-pdsch_t pdsch;
+  uint16_t rnti; 
-pdsch_harq_t harq_process;
+  int nof_subframes;
-regs_t regs;
+  bool disable_plots;
-lte_fft_t fft;
+  bool pbch_only; 
-chest_t chest;
+  iodev_cfg_t io_config; 
-sync_frame_t sframe;
+}prog_args_t;
-
+
-#define CLRSTDOUT printf("\r\n"); fflush(stdout); printf("\r\n")
+void args_default(prog_args_t *args) {
-
+  args->cell_id_file = 1; 
-#define DOWNSAMPLE_FACTOR(x, y) lte_symbol_sz(x) / lte_symbol_sz(y)
+  args->nof_prb_file = 6;
-
+  args->rnti = SIRNTI;
-void usage(char *prog) {
+  args->nof_subframes = -1; 
-  printf("Usage: %s [icagfndvtpb]\n", prog);
+  args->disable_plots = false; 
-  printf("\t-i input_file [Default use USRP]\n");
+  args->pbch_only = false; 
-  printf("\t-c cell_id if reading from file [Default %d]\n", cell_id_file);
+  args->io_config.find_threshold = -1.0; 
+  args->io_config.input_file_name = NULL; 
+  args->io_config.uhd_args = "";
+  args->io_config.uhd_freq = -1.0;
+  args->io_config.uhd_gain = 20.0; 
+}
+
+void usage(prog_args_t *args, char *prog) {
+  printf("Usage: %s [cargfndvtb] [-i input_file | -f rx_frequency (in Hz)]\n", prog);
+  printf("\t-c cell_id if reading from file [Default %d]\n", args->cell_id_file);
+  printf("\t-p nof_prb if reading from file [Default %d]\n", args->nof_prb_file);
+  printf("\t-r RNTI to look for [Default 0x%x]\n", args->rnti);
 #ifndef DISABLE_UHD
-  printf("\t-a UHD args [Default %s]\n", uhd_args);
+  printf("\t-a UHD args [Default %s]\n", args->io_config.uhd_args);
-  printf("\t-g UHD RX gain [Default %.2f dB]\n", uhd_gain);
+  printf("\t-g UHD RX gain [Default %.2f dB]\n", args->io_config.uhd_gain);
-  printf("\t-f UHD RX frequency [Default %.1f MHz]\n", uhd_freq / 1000000);
 #else
   printf("\t   UHD is disabled. CUHD library not available\n");
 #endif
-  printf("\t-b Decode PBCH only [Default All]\n");
+  printf("\t-b Decode PBCH only [Default All channels]\n");
-  printf("\t-p sampling_nof_prb [Default %d]\n", sampling_nof_prb);
+  printf("\t-n nof_subframes [Default %d]\n", args->nof_subframes);
-  printf("\t-n nof_frames [Default %d]\n", nof_frames);
+  printf("\t-t PSS threshold [Default %f]\n", args->io_config.find_threshold);
-  printf("\t-t PSS threshold [Default %f]\n", find_threshold);
 #ifndef DISABLE_GRAPHICS
   printf("\t-d disable plots [Default enabled]\n");
 #else
@@ -122,585 +98,219 @@ void usage(char *prog) {
   printf("\t-v [set verbose to debug, default none]\n");
 }
 
-void parse_args(int argc, char **argv) {
+void parse_args(prog_args_t *args, int argc, char **argv) {
   int opt;
-  while ((opt = getopt(argc, argv, "icagfndvtpb")) != -1) {
+  args_default(args);
+  while ((opt = getopt(argc, argv, "icagfndvtbp")) != -1) {
     switch (opt) {
     case 'i':
-      input_file_name = argv[optind];
+      args->io_config.input_file_name = argv[optind];
       break;
     case 'c':
-      cell_id_file = atoi(argv[optind]);
+      args->cell_id_file = atoi(argv[optind]);
+      break;
+    case 'p':
+      args->nof_prb_file = atoi(argv[optind]);
       break;
     case 'a':
-      uhd_args = argv[optind];
+      args->io_config.uhd_args = argv[optind];
       break;
     case 'g':
-      uhd_gain = atof(argv[optind]);
+      args->io_config.uhd_gain = atof(argv[optind]);
       break;
     case 'f':
-      uhd_freq = atof(argv[optind]);
+      args->io_config.uhd_freq = atof(argv[optind]);
       break;
     case 'b':
-      pbch_only = true;
+      args->pbch_only = true;
       break;
     case 't':
-      find_threshold = atof(argv[optind]);
+      args->io_config.find_threshold = atof(argv[optind]);
-      break;
-    case 'p':
-      sampling_nof_prb = atof(argv[optind]);
       break;
     case 'n':
-      nof_frames = atoi(argv[optind]);
+      args->nof_subframes = atoi(argv[optind]);
       break;
     case 'd':
-      disable_plots = 1;
+      args->disable_plots = true;
       break;
     case 'v':
       verbose++;
       break;
     default:
-      usage(argv[0]);
+      usage(args, argv[0]);
       exit(-1);
     }
   }
+  if (args->io_config.uhd_freq < 0 && args->io_config.input_file_name == NULL) {
+    usage(args, argv[0]);
   }
-
-#ifndef DISABLE_GRAPHICS
-
-void init_plots() {
-  plot_init();
-  plot_real_init(&poutfft);
-  plot_real_setTitle(&poutfft, "Output FFT - Magnitude");
-  plot_real_setLabels(&poutfft, "Index", "dB");
-  plot_real_setYAxisScale(&poutfft, -60, 0);
-  plot_real_setXAxisScale(&poutfft, 1, 504);
-
-  plot_complex_init(&pce);
-  plot_complex_setTitle(&pce, "Channel Estimates");
-  plot_complex_setYAxisScale(&pce, Ip, -0.01, 0.01);
-  plot_complex_setYAxisScale(&pce, Q, -0.01, 0.01);
-  plot_complex_setYAxisScale(&pce, Magnitude, 0, 0.01);
-  plot_complex_setYAxisScale(&pce, Phase, -M_PI, M_PI);
-
-  plot_scatter_init(&pscatrecv);
-  plot_scatter_setTitle(&pscatrecv, "Received Symbols");
-  plot_scatter_setXAxisScale(&pscatrecv, -0.01, 0.01);
-  plot_scatter_setYAxisScale(&pscatrecv, -0.01, 0.01);
-
-  plot_scatter_init(&pscatequal);
-  plot_scatter_setTitle(&pscatequal, "Equalized Symbols");
-  plot_scatter_setXAxisScale(&pscatequal, -1, 1);
-  plot_scatter_setYAxisScale(&pscatequal, -1, 1);
-}
-
-#endif
-
-
-/* This function initializes the objects defined as global variables */
-int base_init(int nof_prb) {
-  int i;
-  
-  int sf_n_re = 2 * CPNORM_NSYMB * nof_prb * RE_X_RB;
-  int sf_n_samples = 2 * SLOT_LEN_CPNORM(lte_symbol_sz(nof_prb));
-
-
-#ifndef DISABLE_GRAPHICS
-  if (!disable_plots) {
-    tmp_plot = malloc(sizeof(cf_t) * sf_n_re);
-    if (!tmp_plot) {
-      perror("malloc");
-      return -1;
-    }
-    init_plots();
-  }
-#else
-  printf("-- PLOTS are disabled. Graphics library not available --\n\n");
-#endif
-
-  if (input_file_name) {
-    if (filesource_init(&fsrc, input_file_name, COMPLEX_FLOAT_BIN)) {
-      return -1;
-    }
-  } else {
-    /* open UHD device */
-#ifndef DISABLE_UHD
-    printf("Opening UHD device...\n");
-    if (cuhd_open(uhd_args, &uhd)) {
-      fprintf(stderr, "Error opening uhd\n");
-      return -1;
-    }
-#else
-    printf("Error UHD not available. Select an input file\n");
-    return -1;
-#endif
 }
+/**********************************************************************/
 
-  /* For the input buffer, we allocate space for 1 ms of samples */
+void sigintHandler(int x) {
-  input_buffer = (cf_t*) malloc(sf_n_samples * sizeof(cf_t));
+  go_exit = 1; 
-  if (!input_buffer) {
-    perror("malloc");
-    return -1;
 }
 
-  input_decim_buffer = (cf_t*) malloc(sf_n_samples * sizeof(cf_t));
+int main(int argc, char **argv) {
-  if (!input_decim_buffer) {
+  int ret; 
-    perror("malloc");
+  cf_t *sf_buffer; 
-    return -1;
+  iodev_t iodev; 
-  }
+  prog_args_t prog_args; 
+  lte_cell_t cell; 
+  ue_dl_t ue_dl; 
+  bool ue_dl_initiated = false; 
+  int64_t sf_cnt;
+  uint32_t sf_idx;
+  pbch_mib_t mib; 
   
-  /* This buffer is the aligned version of input_buffer */
+  parse_args(&prog_args, argc, argv);
-  sf_buffer = (cf_t*) malloc(sf_n_samples * sizeof(cf_t));
-  if (!sf_buffer) {
-    perror("malloc");
-    return -1;
-  }
   
-  /* For the rest of the buffers, we allocate for the number of RE in one subframe */
+  if (iodev_init(&iodev, &prog_args.io_config)) {
-  fft_buffer = (cf_t*) malloc(sf_n_re * sizeof(cf_t));
+    fprintf(stderr, "Error initiating input device\n");
-  if (!fft_buffer) {
+    exit(-1);
-    perror("malloc");
-    return -1;
   }
   
-  for (i = 0; i < MAX_PORTS; i++) {
+  if (!prog_args.disable_plots) {
-    ce[i] = (cf_t*) malloc(sf_n_re * sizeof(cf_t));
+    init_plots();    
-    if (!ce[i]) {
-      perror("malloc");
-      return -1;
-    }
   }
   
-  if (sync_frame_init(&sframe, DOWNSAMPLE_FACTOR(nof_prb,6))) {
+  /* Setup SIGINT handler */
-    fprintf(stderr, "Error initiating PSS/SSS\n");
+  printf("\n --- Press Ctrl+C to exit --- \n");
-    return -1;
+  signal(SIGINT, sigintHandler);
-  }
 
-  if (chest_init(&chest, LINEAR, nof_prb * RE_X_RB, CPNORM_NSYMB, NOF_PORTS)) {
+  /* Initialize frame and subframe counters */
-    fprintf(stderr, "Error initializing equalizer\n");
+  sf_cnt = 0;
-    return -1;
+  sf_idx = 0; 
-  }
   
-  if (lte_fft_init(&fft, CPNORM, nof_prb)) {
+  /* Main loop */
-    fprintf(stderr, "Error initializing FFT\n");
+  while (!go_exit && (sf_cnt < prog_args.nof_subframes || prog_args.nof_subframes == -1)) {
-    return -1;
-  }
 
-  return 0;
+    ret = iodev_receive(&iodev, &sf_buffer);
+    if (ret < 0) {
+      fprintf(stderr, "Error reading from input device (%d)\n", ret);
+      break;
     }
     
-void base_free() {
+    /* iodev_receive returns 1 if successfully read 1 aligned subframe */
-  int i;
+    if (ret == 1) {
-
+      if (!ue_dl_initiated) {
-  if (input_file_name) {
+        if (iodev_isUSRP(&iodev)) {
-    filesource_free(&fsrc);
+          cell = ue_sync_get_cell(&iodev.sframe);
+          mib = ue_sync_get_mib(&iodev.sframe);
         } else {
-#ifndef DISABLE_UHD
+          cell.id = prog_args.cell_id_file;
-    cuhd_close(uhd);
+          cell.cp = CPNORM; 
-#endif
+          cell.nof_ports = 1; // TODO: Use prog_args 
-  }
+          cell.nof_prb = prog_args.nof_prb_file; 
-
+          mib.phich_resources = R_1; 
-#ifndef DISABLE_GRAPHICS
+          mib.phich_length = PHICH_NORM;
-  if (!disable_plots) {
-    if (tmp_plot) {
-      free(tmp_plot);      
-    }
-    plot_exit();
-  }
-#endif
-
-  pbch_free(&pbch);
-  pdsch_free(&pdsch);
-  pdcch_free(&pdcch);
-  regs_free(&regs);
-  sync_frame_free(&sframe);
-  lte_fft_free(&fft);
-  chest_free(&chest);
-
-  free(input_buffer);
-  free(input_decim_buffer);
-  free(fft_buffer);
-  for (i = 0; i < MAX_PORTS; i++) {
-    free(ce[i]);
         }        
+        if (ue_dl_init(&ue_dl, cell, mib.phich_resources, mib.phich_length, 1234)) { 
+          fprintf(stderr, "Error initiating UE downlink processing module\n");
+          exit(-1);
         }
-
+        pdsch_set_rnti(&ue_dl.pdsch, prog_args.rnti);
-int mib_init(phich_resources_t phich_resources, phich_length_t phich_length) {
+        ue_dl_initiated = true; 
-
+      } else {
-  if (!lte_cell_isvalid(&cell)) {
+        if (iodev_isUSRP(&iodev)) {
-    fprintf(stderr, "Invalid cell properties: Id=%d, Ports=%d, PRBs=%d\n",
+          sf_idx = ue_sync_get_sfidx(&iodev.sframe);
-            cell.id, cell.nof_ports, cell.nof_prb);
-    return -1;
         } 
-  if (cell.nof_prb > sampling_nof_prb) {
+        if (ue_dl_process(&ue_dl, sf_buffer, sf_idx, ue_sync_get_mib(&iodev.sframe).sfn, prog_args.rnti)) {
-    fprintf(stderr, "Error sampling frequency is %.2f Mhz but captured signal has %d PRB\n", 
+          fprintf(stderr, "\nError running receiver\n");fflush(stdout);
-      (float) lte_sampling_freq_hz(sampling_nof_prb)/MHZ, cell.nof_prb);
+          exit(-1);
-    return -1;
         }
-  if (regs_init(&regs, phich_resources, phich_length, cell)) {
+        if (!(sf_cnt % 10)) {         
-    fprintf(stderr, "Error initiating REGs\n");
+          printf("Cell ID: %3d, CFO: %+.4f KHz, SFO: %+.4f Khz, TimeOffset: %4d, Errors: %4d/%4d/%d, BLER: %.1e\r",
-    return -1;
+              cell.id, iodev.sframe.cur_cfo * 15, iodev.sframe.mean_time_offset / 5, iodev.sframe.peak_idx,
+              (int) ue_dl.pkt_errors, (int) ue_dl.pkts_total, (int) ue_dl.nof_trials, (float) ue_dl.pkt_errors / ue_dl.pkts_total);
+          fflush(stdout);       
+          if (VERBOSE_ISINFO()) {
+            printf("\n");
           }
-
-  if (pcfich_init(&pcfich, &regs, cell)) {
-    fprintf(stderr, "Error creating PCFICH object\n");
-    return -1;
         }  
-
+        if (!prog_args.disable_plots && sf_idx == 5) {
-  if (pdcch_init(&pdcch, &regs, cell)) {
+          do_plots(&ue_dl, sf_idx);          
-    fprintf(stderr, "Error creating PDCCH object\n");
-    return -1;
         }
-
-  if (pdsch_init(&pdsch, 1234, cell)) {
-    fprintf(stderr, "Error creating PDSCH object\n");
-    return -1;
       }
-  
+      if (iodev_isfile(&iodev)) {
-  if (pdsch_harq_init(&harq_process, &pdsch)) {
+        sf_idx++;       
-    fprintf(stderr, "Error initiating HARQ process\n");
+        if (sf_idx == NSUBFRAMES_X_FRAME) {
-    return -1;
+          sf_idx = 0;
         }        
-  
-  chest_set_nof_ports(&chest, cell.nof_ports);
-  
-  mib_initiated = 1;
-  
-  DEBUG("Receiver initiated cell.id=%d nof_prb=%d\n", cell.id, cell.nof_prb);
-  
-  return 0;
       }
-
-int cell_id_init(int nof_prb, int cell_id) {
-
-  lte_cell_t cell;
-  
-  cell.id = cell_id;
-  cell.nof_prb = nof_prb;
-  cell.nof_ports = 2;
-  cell.cp = CPNORM;
-  
-  if (chest_ref_LTEDL(&chest, cell)) {
-    fprintf(stderr, "Error initializing reference signal\n");
-    return -1;
     }
-
+    if (prog_args.nof_subframes > 0) {
-  if (pbch_init(&pbch, cell)) {
+      sf_cnt++;      
-    fprintf(stderr, "Error initiating PBCH\n");
-    return -1;
     }    
-  
+    if (iodev_isfile(&iodev)) {
-  cell_id_initated = 1;
+      usleep(5000);
-  DEBUG("PBCH initiated cell_id=%d\n", cell_id);
-  
-  return 0;
     }
-
-char data[10000];
-
-int pdsch_run(cf_t *input, uint32_t sf_idx) {
-  uint32_t cfi, cfi_distance, i;
-  cf_t *input_decim;
-  ra_pdsch_t ra_dl;
-  dci_location_t locations[10];
-  dci_msg_t dci_msg;
-  uint32_t nof_locations;
-  
-  /* Downsample if the signal bandwith is shorter */
-  if (sampling_nof_prb > cell.nof_prb) {
-    decim_c(input, input_decim_buffer, sf_n_samples, DOWNSAMPLE_FACTOR(sampling_nof_prb, cell.nof_prb));
-    input_decim = input_decim_buffer;
-  } else {
-    input_decim = input;
   }
 
-  lte_fft_run_sf(&fft, input_decim, fft_buffer);
+  if (ue_dl_initiated) {
-
+    ue_dl_free(&ue_dl);    
-  /* Get channel estimates for each port */
-  chest_ce_sf(&chest, fft_buffer, ce, sf_idx);
-  
-  /* First decode PCFICH and obtain CFI */
-  if (pcfich_decode(&pcfich, fft_buffer, ce, sf_idx, &cfi, &cfi_distance)<0) {
-    fprintf(stderr, "Error decoding PCFICH\n");
-    return -1;
   }
+  iodev_free(&iodev);
 
-  INFO("Decoded CFI=%d with distance %d\n", cfi, cfi_distance);
+  printf("\nBye\n");
-
+  exit(0);
-  if (regs_set_cfi(&regs, cfi)) {
-    fprintf(stderr, "Error setting CFI\n");
-    return -1;
-  }
-  
-  /* Search only UE-specific locations */
-  nof_locations = pdcch_ue_locations(&pdcch, locations, 10, sf_idx, cfi, 1234);
-
-  uint16_t crc_rem = 0;
-  for (i=0;i<nof_locations && crc_rem != 1234;i++) {
-    if (pdcch_extract_llr(&pdcch, fft_buffer, ce, locations[i], sf_idx, cfi)) {
-      fprintf(stderr, "Error extracting LLRs\n");
-      return -1;
-    }
-    if (pdcch_decode_msg(&pdcch, &dci_msg, Format1, &crc_rem)) {
-      fprintf(stderr, "Error decoding DCI msg\n");
-      return -1;
-    }
 }
 
-  if (crc_rem == 1234) {
-    if (dci_msg_to_ra_dl(&dci_msg, 1234, 1234, cell, cfi, &ra_dl)) {
-      fprintf(stderr, "Error unpacking PDSCH scheduling DCI message\n");
-      return -1;
-    }
 
-    if (pdsch_harq_setup(&harq_process, ra_dl.mcs, &ra_dl.prb_alloc)) {
-      fprintf(stderr, "Error configuring HARQ process\n");
-      return -1;
-    }
 
-    if (pdsch_decode(&pdsch, fft_buffer, ce, data, sf_idx, &harq_process, ra_dl.rv_idx)) {
-      pkt_errors++;
-    }
-    pkts_total++;    
-  }
 
+/**********************************************************************
+ *  Plotting Functions
+ ***********************************************************************/
 #ifndef DISABLE_GRAPHICS
-  if (!disable_plots && crc_rem == 1234) {
-    int n_re = 2 * RE_X_RB * CPNORM_NSYMB * cell.nof_prb;
-    for (i = 0; i < n_re; i++) {
-      tmp_plot[i] = 10 * log10f(cabsf(fft_buffer[i]));
-      if (isinf(tmp_plot[i])) {
-        tmp_plot[i] = -80;
-      }
-    }
-    plot_real_setNewData(&poutfft, tmp_plot, n_re);
-    plot_complex_setNewData(&pce, ce[0], n_re);
-    plot_scatter_setNewData(&pscatrecv, pdsch.pdsch_symbols[0], ra_dl.prb_alloc.re_sf[sf_idx]);
-    plot_scatter_setNewData(&pscatequal, pdsch.pdsch_d, ra_dl.prb_alloc.re_sf[sf_idx]);    
-  }
-#endif
-
-  return 0;
-}
 
-int mib_decoder_run(cf_t *input, pbch_mib_t *mib) {
-  lte_fft_run_sf(&fft, input, fft_buffer);
 
-  /* Get channel estimates for each port */
+#include "liblte/graphics/plot.h"
-  chest_ce_sf(&chest, fft_buffer, ce, 0);
+plot_real_t poutfft;
+plot_complex_t pce;
+plot_scatter_t pscatrecv, pscatequal;
 
-  DEBUG("Decoding PBCH\n", 0);
+float tmp_plot[SLOT_LEN_RE(MAX_PRB, CPNORM)];
-  return pbch_decode(&pbch, fft_buffer, ce, mib);
-}
 
-int run_receiver(cf_t *input, uint32_t cell_id, uint32_t sf_idx) {
+void init_plots() {
-  pbch_mib_t mib;
+  plot_init();
+  plot_real_init(&poutfft);
+  plot_real_setTitle(&poutfft, "Output FFT - Magnitude");
+  plot_real_setLabels(&poutfft, "Index", "dB");
+  plot_real_setYAxisScale(&poutfft, -60, 0);
 
-  if (!cell_id_initated) {
+  plot_complex_init(&pce);
-    cell_id_init(sampling_nof_prb, cell_id);
+  plot_complex_setTitle(&pce, "Channel Estimates");
-  }
+  plot_complex_setYAxisScale(&pce, Ip, -0.01, 0.01);
-  if (!cell.nof_prb || pbch_only) {
+  plot_complex_setYAxisScale(&pce, Q, -0.01, 0.01);
+  plot_complex_setYAxisScale(&pce, Magnitude, 0, 0.01);
+  plot_complex_setYAxisScale(&pce, Phase, -M_PI, M_PI);
 
-    if (!sf_idx) {
+  plot_scatter_init(&pscatrecv);
-      if (mib_decoder_run(input, &mib)) {
+  plot_scatter_setTitle(&pscatrecv, "Received Symbols");
-        INFO("MIB decoded!\n", 0);
+  plot_scatter_setXAxisScale(&pscatrecv, -0.01, 0.01);
-        cell.id = cell_id;
+  plot_scatter_setYAxisScale(&pscatrecv, -0.01, 0.01);
-        cell.cp = CPNORM;
-        cell.nof_ports = mib.nof_ports;
-        cell.nof_prb = mib.nof_prb;
-        frame_number = mib.sfn; 
 
-        if (!mib_initiated) {
+  plot_scatter_init(&pscatequal);
-          if (mib_init(mib.phich_resources, mib.phich_length)) {
+  plot_scatter_setTitle(&pscatequal, "Equalized Symbols");
-            return -1;
+  plot_scatter_setXAxisScale(&pscatequal, -1, 1);
-          }
+  plot_scatter_setYAxisScale(&pscatequal, -1, 1);
-        }
-        if (VERBOSE_ISINFO() || !frame_cnt) {
-          CLRSTDOUT;
-          printf(" - Phy. CellId:\t    %d\n", cell_id);
-          pbch_mib_fprint(stdout, &mib);                  
-        }
-      } else if (pbch_only) {
-        pkt_errors++;
 }
-      if (pbch_only) {
+
-        #ifndef DISABLE_GRAPHICS
+void do_plots(ue_dl_t *q, uint32_t sf_idx) {
-        if (!disable_plots) {
   int i;
-          int n_re = 2 * RE_X_RB * CPNORM_NSYMB * sampling_nof_prb;
+  uint32_t nof_re = SLOT_LEN_RE(q->cell.nof_prb, q->cell.cp);
-          for (i = 0; i < n_re; i++) {
+  uint32_t nof_symbols = q->harq_process[0].prb_alloc.re_sf[sf_idx];
-            tmp_plot[i] = 10 * log10f(cabsf(fft_buffer[i]));
+  for (i = 0; i < nof_re; i++) {
+    tmp_plot[i] = 10 * log10f(cabsf(q->sf_symbols[i]));
     if (isinf(tmp_plot[i])) {
       tmp_plot[i] = -80;
     }
   }
-          plot_real_setNewData(&poutfft, tmp_plot, n_re);
+  plot_real_setNewData(&poutfft, tmp_plot, nof_re);        
-          plot_complex_setNewData(&pce, ce[0], n_re);
+  plot_complex_setNewData(&pce, q->ce[0], nof_re);
-          plot_scatter_setNewData(&pscatrecv, pbch.pbch_symbols[0], pbch.nof_symbols);
+  plot_scatter_setNewData(&pscatrecv, q->pdsch.pdsch_symbols[0], nof_symbols);
-          plot_scatter_setNewData(&pscatequal, pbch.pbch_d, pbch.nof_symbols);    
+  plot_scatter_setNewData(&pscatequal, q->pdsch.pdsch_d, nof_symbols);
 }
-        #endif
-        pkts_total++;
-      }
-    }    
-  } 
-  if (cell.nof_prb && !pbch_only) {
-    if (pdsch_run(input, sf_idx)) {
-      fprintf(stderr, "\nError running PDSCH decoder\n");
-      return -1;
-    }
-  }
-  return 0;
-}
-
-void sigintHandler(int sig_num) {
-  go_exit = 1;
-}
-
-void setup_uhd() {
-  double samp_freq; 
-
-#ifndef DISABLE_UHD
-  /* Get the sampling rate from the number of PRB */
-  samp_freq = lte_sampling_freq_hz(sampling_nof_prb);
-
-  INFO("Setting sampling frequency %.2f MHz\n", (float) samp_freq/MHZ);
-  cuhd_set_rx_srate(uhd, samp_freq);
-  cuhd_set_rx_gain(uhd, uhd_gain);
 
-  /* set uhd_freq */
-  cuhd_set_rx_freq(uhd, (double) uhd_freq);
-  cuhd_rx_wait_lo_locked(uhd);
-  DEBUG("Set uhd_freq to %.3f MHz\n", (double ) uhd_freq);
-
-  DEBUG("Starting receiver...\n", 0);
-  cuhd_start_rx_stream(uhd);
 #endif
-}
-
-void read_io(cf_t *buffer, int nsamples) {
-  int n; 
-  DEBUG(" -----   RECEIVING %d SAMPLES ---- \n", nsamples);
-  if (input_file_name) {
-    n = filesource_read(&fsrc, buffer, nsamples);
-    if (n == -1) {
-      fprintf(stderr, "Error reading file\n");
-      exit(-1);
-      /* wrap file if arrive to end */
-    } else if (n < nsamples) {
-      DEBUG("Read %d from file. Seeking to 0\n",n);
-      filesource_seek(&fsrc, 0);
-      filesource_read(&fsrc, buffer, nsamples);
-    }
-  } else {
-#ifndef DISABLE_UHD
-    cuhd_recv(uhd, buffer, nsamples, 1);
-#endif
-  }
-}
-
-int main(int argc, char **argv) {
-  int ret; 
-  uint32_t sf_idx; 
-  uint32_t cell_id;
-  cf_t *in_ptr; 
-  
-#ifdef DISABLE_UHD
-  if (argc < 3) {
-    usage(argv[0]);
-    exit(-1);
-  }
-#endif
-
-  parse_args(argc, argv);
-
-  if (base_init(sampling_nof_prb)) {
-    fprintf(stderr, "Error initializing memory\n");
-    exit(-1);
-  }
-
-  /* If input_file_name is NULL, we read from the USRP */
-  if (!input_file_name) {
-    setup_uhd();
-  }
-
-  printf("\n --- Press Ctrl+C to exit --- \n");
-  
-  signal(SIGINT, sigintHandler);
-
-  /* Initialize variables */
-  frame_cnt = 0;
-  frame_number = -1;
-    
-  /* The number of samples read from the USRP or file corresponds to 1 ms (subframe) */
-  sf_n_samples = 1920 * lte_symbol_sz(sampling_nof_prb)/128;
-  
-  sync_frame_set_threshold(&sframe, find_threshold);
-
-  sf_idx = 0;
-  cell_id = cell_id_file;
-  if (input_file_name) {
-    in_ptr = input_buffer;    
-  } else {    
-    in_ptr = sf_buffer;
-  }
-
-  while (!go_exit && (frame_cnt < nof_frames || nof_frames == -1)) {
-
-    read_io(input_buffer, sf_n_samples);
-
-    if (!input_file_name) {
-      ret = sync_frame_push(&sframe, input_buffer, sf_buffer);
-    } else {
-      ret = 1;
-    }
-    switch(ret ) {
-      case 0:
-        /* not yet synched */
-        break;
-      case 1:
-        /* sf_buffer is aligned to the subframe */
-        
-        if (!(frame_cnt%10)) {
-          frame_number++;
-        }
-        
-        if (!input_file_name) {
-          sf_idx = sync_frame_sfidx(&sframe);
-          cell_id = sync_frame_cell_id(&sframe);
-        } 
-        
-        /* synch'd and tracking */
-        if (run_receiver(in_ptr, cell_id, sf_idx)) {
-          fprintf(stderr, "\nError running receiver\n");fflush(stdout);
-          exit(-1);
-        }
-        
-        if (!(frame_cnt % 10)) {
-          printf("SFN: %4d, CFO: %+.4f KHz, SFO: %+.4f Khz, TimeOffset: %4d, Errors: %4d/%4d, BLER: %.1e\r",
-              frame_number, sframe.cur_cfo * 15, sframe.timeoffset / 5, sframe.peak_idx,
-              pkt_errors, pkts_total,
-              (float) pkt_errors / pkts_total);
-          fflush(stdout);          
-        }
-        if (input_file_name) {
-          sf_idx++;          
-        }
-        break;
-      default:
-        fprintf(stderr, "Error running automatic synchronization\n");
-        exit(-1);
-    }
-
-    frame_cnt++;
-    if (input_file_name) {
-      usleep(5000);
-    }
-  }
-
-  base_free();
-
-  printf("\nBye\n");
-  exit(0);
-}
-

lte/phy/examples/scan_mib.c

@@ -162,11 +162,11 @@ int base_init(int frame_length) {
       return -1;
     }
   }
-  if (sync_init(&ssync, FLEN)) {
+  if (sync_init(&ssync, FLEN, 128, 128)) {
     fprintf(stderr, "Error initiating PSS/SSS\n");
     return -1;
   }
-  if (chest_init(&chest, LINEAR, CPNORM, 6, MAX_PORTS)) {
+  if (chest_init(&chest, CPNORM, 6, MAX_PORTS)) {
     fprintf(stderr, "Error initializing equalizer\n");
     return -1;
   }
@@ -349,12 +349,14 @@ int main(int argc, char **argv) {
   int cell_id;
   float max_peak_to_avg;
   float sfo;
-  int find_idx, track_idx, last_found;
+  uint32_t track_idx, find_idx; 
+  int last_found;
   enum sync_state state;
   int n;
   int mib_attempts;
   int nslot;
   pbch_mib_t mib;
+  int ret;
   
   if (argc < 3) {
     usage(argv[0]);
@@ -434,14 +436,14 @@ int main(int argc, char **argv) {
         cuhd_recv(uhd, input_buffer, FLEN, 1);
 #endif
         /* set find_threshold and go to FIND state */
-        sync_set_threshold(&ssync, find_threshold);
+        sync_set_threshold(&ssync, find_threshold, find_threshold/2);
         state = FIND;
         break;
       case FIND:
         /* find peak in all frame */
-        find_idx = sync_find(&ssync, &input_buffer[FLEN]);
+        ret = sync_find(&ssync, &input_buffer[FLEN], &find_idx);
         DEBUG("[%3d/%d]: PAR=%.2f\n", freq, nof_bands, sync_get_peak_to_avg(&ssync));
-        if (find_idx != -1) {
+        if (ret == 1) {
           /* if found peak, go to track and set lower threshold */
           frame_cnt = -1;
           last_found = 0;
@@ -462,7 +464,7 @@ int main(int argc, char **argv) {
       case TRACK:
         INFO("Tracking PSS find_idx %d offset %d\n", find_idx, find_idx - track_len);
 
-        track_idx = sync_track(&ssync, &input_buffer[FLEN + find_idx - track_len]);
+        ret = sync_track(&ssync, input_buffer, FLEN + find_idx - track_len, &track_idx);
         p2a_v[frame_cnt] = sync_get_peak_to_avg(&ssync);
 
         /* save cell id for the best peak-to-avg */
@@ -470,7 +472,7 @@ int main(int argc, char **argv) {
           max_peak_to_avg = p2a_v[frame_cnt];
           cell_id = sync_get_cell_id(&ssync);
         }
-        if (track_idx != -1) {
+        if (ret == 1) {
           cfo_v[frame_cnt] = sync_get_cfo(&ssync);
           last_found = frame_cnt;
           find_idx += track_idx - track_len;
@@ -506,7 +508,7 @@ int main(int argc, char **argv) {
 
         // Correct CFO
         INFO("Correcting CFO=%.4f\n", cfo[freq]);
-        cfo_correct(&cfocorr, &input_buffer[FLEN], (-cfo[freq])/128);
+        cfo_correct(&cfocorr, &input_buffer[FLEN], &input_buffer[FLEN], (-cfo[freq])/128);
 
         if (nslot == 0) {
           if (mib_decoder_run(&input_buffer[FLEN+find_idx], &mib)) {

lte/phy/examples/scan_pss.c

@@ -261,10 +261,12 @@ int main(int argc, char **argv) {
   sync_t sfind, strack;
   float max_peak_to_avg;
   float sfo;
-  int find_idx, track_idx, last_found;
+  uint32_t find_idx, track_idx; 
+  int last_found;
   enum sync_state state;
   int n;
   filesink_t fs;
+  int ret; 
 
   if (argc < 3) {
     usage(argv[0]);
@@ -278,13 +280,13 @@ int main(int argc, char **argv) {
     exit(-1);
   }
 
-  if (sync_init(&sfind, FLEN)) {
+  if (sync_init(&sfind, FLEN, 128, 128)) {
     fprintf(stderr, "Error initiating PSS/SSS\n");
     exit(-1);
   }
   sync_pss_det_peak_to_avg(&sfind);
 
-  if (sync_init(&strack, track_len)) {
+  if (sync_init(&strack, track_len, 128, 128)) {
     fprintf(stderr, "Error initiating PSS/SSS\n");
     exit(-1);
   }
@@ -315,6 +317,9 @@ int main(int argc, char **argv) {
   max_peak_to_avg = 0;
   last_found = 0;
   frame_cnt = 0;
+
+  sync_set_threshold(&sfind, find_threshold, track_threshold);
+
   while(freq<nof_bands) {
     /* scan only bands above rssi_threshold */
     if (!IS_SIGNAL(freq)) {
@@ -346,19 +351,16 @@ int main(int argc, char **argv) {
         /* receive first frame */
         cuhd_recv(uhd, input_buffer, FLEN, 1);
 
-        /* set find_threshold and go to FIND state */
-        sync_set_threshold(&sfind, find_threshold);
         state = FIND;
         break;
       case FIND:
         /* find peak in all frame */
-        find_idx = sync_find(&sfind, &input_buffer[FLEN]);
+        ret = sync_find(&sfind, &input_buffer[FLEN], &find_idx);
         DEBUG("[%3d/%d]: PAR=%.2f\n", freq, nof_bands, sync_get_peak_to_avg(&sfind));
-        if (find_idx != -1) {
+        if (ret == 1) {
           /* if found peak, go to track and set lower threshold */
           frame_cnt = -1;
           last_found = 0;
-          sync_set_threshold(&strack, track_threshold);
           state = TRACK;
           INFO("[%3d/%d]: EARFCN %d Freq. %.2f MHz PSS found PAR %.2f dB\n", freq, nof_bands,
                         channels[freq].id, channels[freq].fd,
@@ -380,7 +382,7 @@ int main(int argc, char **argv) {
 
         filesink_write(&fs, &input_buffer[FLEN+find_idx+track_len], track_len);
 
-        track_idx = sync_find(&strack, &input_buffer[FLEN + find_idx - track_len]);
+        ret = sync_find(&strack, &input_buffer[FLEN + find_idx - track_len], &track_idx);
         p2a_v[frame_cnt] = sync_get_peak_to_avg(&strack);
 
         /* save cell id for the best peak-to-avg */
@@ -388,7 +390,7 @@ int main(int argc, char **argv) {
           max_peak_to_avg = p2a_v[frame_cnt];
           cell_id = sync_get_cell_id(&strack);
         }
-        if (track_idx != -1) {
+        if (ret == 1) {
           cfo_v[frame_cnt] = sync_get_cfo(&strack);
           last_found = frame_cnt;
           find_idx += track_idx - track_len;

lte/phy/examples/synch_file.c

@@ -112,10 +112,10 @@ int main(int argc, char **argv) {
   float mean_value[3];
   int frame_cnt;
   cf_t *input;
-  int m0, m1;
+  uint32_t m0, m1;
   float m0_value, m1_value;
-  int N_id_2;
+  uint32_t N_id_2;
-  int sss_idx;
+  uint32_t sss_idx;
   struct timeval tdata[3];
   int *exec_time;
 
@@ -173,7 +173,7 @@ int main(int argc, char **argv) {
       fprintf(stderr, "Error initializing N_id_2\n");
       exit(-1);
     }
-    if (sss_synch_init(&sss[N_id_2])) {
+    if (sss_synch_init(&sss[N_id_2], 128)) {
       fprintf(stderr, "Error initializing SSS object\n");
       exit(-1);
     }
@@ -196,7 +196,7 @@ int main(int argc, char **argv) {
 
     gettimeofday(&tdata[1], NULL);
     if (force_cfo != CFO_AUTO) {
-      cfo_correct(&cfocorr, input, -force_cfo/128);
+      cfo_correct(&cfocorr, input, input, -force_cfo/128);
     }
 
     if (force_N_id_2 != -1) {

lte/phy/include/liblte/phy/ch_estimation/chest.h

@@ -33,19 +33,19 @@
 #include <stdio.h>
 
 #include "liblte/config.h"
+
+#include "liblte/phy/resampling/interp.h"
 #include "liblte/phy/ch_estimation/refsignal.h"
-#include "liblte/phy/filter/filter2d.h"
 #include "liblte/phy/common/phy_common.h"
 
 typedef _Complex float cf_t; /* this is only a shortcut */
 
-typedef enum {LINEAR} chest_interp_t;
 typedef void (*interpolate_fnc_t) (cf_t *input, 
                                    cf_t *output, 
-                                   int M, 
+                                   uint32_t M, 
-                                   int len, 
+                                   uint32_t len, 
-                                   int off_st, 
+                                   uint32_t off_st, 
-                                   int off_end);
+                                   uint32_t off_end);
 
 /** This is an OFDM channel estimator.
  * It works with any reference signal pattern, provided by the object
@@ -61,11 +61,12 @@ typedef struct LIBLTE_API {
   uint32_t nof_symbols;
   
   refsignal_t refsignal[MAX_PORTS][NSLOTS_X_FRAME];
-  interpolate_fnc_t interp;
+  interp_t interp_time[MAX_PORTS]; 
+  interp_t interp_freq[MAX_PORTS]; 
+  
 }chest_t;
 
 LIBLTE_API int chest_init(chest_t *q, 
-                          chest_interp_t interp, 
                           uint32_t nof_re, 
                           uint32_t nof_symbols, 
                           uint32_t nof_ports);
@@ -76,7 +77,6 @@ LIBLTE_API int chest_set_nof_ports(chest_t *q,
                                     uint32_t nof_ports);
 
 LIBLTE_API int chest_init_LTEDL(chest_t *q, 
-                                chest_interp_t interp, 
                                 lte_cell_t cell);
 
 LIBLTE_API int chest_ref_LTEDL_slot_port(chest_t *q, 

lte/phy/include/liblte/phy/common/phy_common.h

@@ -59,6 +59,11 @@ typedef enum {CPNORM, CPEXT} lte_cp_t;
 
 #define MAX_NSYMB     7
 
+#define MAX_PRB   110
+#define RE_X_RB   12
+
+#define SYMBOL_SZ_MAX   2048
+
 #define CPNORM_NSYMB    7
 #define CPNORM_SF_NSYMB 2*CPNORM_NSYMB
 #define CPNORM_0_LEN    160
@@ -79,20 +84,21 @@ typedef enum {CPNORM, CPEXT} lte_cp_t;
 
 #define SLOT_LEN_CPNORM(symbol_sz) (symbol_sz+CP(symbol_sz,CPNORM_0_LEN)+(CPNORM_NSYMB-1)*(symbol_sz+CP(symbol_sz,CPNORM_LEN)))
 #define SLOT_LEN_CPEXT(symbol_sz) (CPEXT_NSYMB*(symbol_sz+CP(symbol_sz, CPEXT_LEN)))
-#define SLOT_LEN(symbol_sz, cp) CP_ISNORM(cp)?SLOT_LEN_CPNORM(symbol_sz):SLOT_LEN_CPEXT(symbol_sz)
+#define SLOT_LEN(symbol_sz, cp) (CP_ISNORM(cp)?SLOT_LEN_CPNORM(symbol_sz):SLOT_LEN_CPEXT(symbol_sz))
 
-#define SF_LEN_CPNORM(symbol_sz) 2*SLOT_LEN_CPNORM(symbol_sz)
+#define SF_LEN_CPNORM(symbol_sz) (2*SLOT_LEN_CPNORM(symbol_sz))
-#define SF_LEN_CPEXT(symbol_sz) 2*SLOT_LEN_CPEXT(symbol_sz)
+#define SF_LEN_CPEXT(symbol_sz) (2*SLOT_LEN_CPEXT(symbol_sz))
 #define SF_LEN(symbol_sz, cp) (2*SLOT_LEN(symbol_sz, cp))
+#define SF_LEN_MAX      SF_LEN(SYMBOL_SZ_MAX, CPNORM)
+
+#define SLOT_LEN_RE(nof_prb, cp) (nof_prb*RE_X_RB*CP_NSYMB(cp))
+#define SF_LEN_RE(nof_prb, cp) (2*SLOT_LEN_RE(nof_prb, cp))
 
 #define SLOT_IDX_CPNORM(idx, symbol_sz) (idx==0?(CP(symbol_sz, CPNORM_0_LEN)):(CP(symbol_sz, CPNORM_0_LEN)+idx*(symbol_sz+CP(symbol_sz, CPNORM_LEN))))
 #define SLOT_IDX_CPEXT(idx, symbol_sz) (idx*(symbol_sz+CP(symbol_sz, CPEXT_LEN)))
 
 #define SAMPLE_IDX(nof_prb, symbol_idx, sample_idx) (symbol_idx*nof_prb*RE_X_RB + sample_idx)
 
-#define MAX_PRB   110
-#define RE_X_RB   12
-
 #define RS_VSHIFT(cell_id) (cell_id%6)
 
 #define GUARD_RE(nof_prb) ((lte_symbol_sz(nof_prb)-nof_prb*RE_X_RB)/2)
@@ -136,8 +142,15 @@ LIBLTE_API enum band_geographical_area {
 
 LIBLTE_API bool lte_cell_isvalid(lte_cell_t *cell);
 
+LIBLTE_API bool lte_N_id_2_isvalid(uint32_t N_id_2);
+
+LIBLTE_API bool lte_N_id_1_isvalid(uint32_t N_id_1);
+
+LIBLTE_API bool lte_symbol_sz_isvalid(uint32_t symbol_sz); 
+
 LIBLTE_API int lte_symbol_sz(uint32_t nof_prb);
 
+
 LIBLTE_API int lte_sampling_freq_hz(uint32_t nof_prb);
 
 LIBLTE_API uint32_t lte_re_x_prb(uint32_t ns, 
@@ -151,6 +164,8 @@ LIBLTE_API uint32_t lte_voffset(uint32_t symbol_id,
 
 LIBLTE_API int lte_cb_size(uint32_t index);
 
+LIBLTE_API char *lte_cp_string(lte_cp_t cp); 
+
 LIBLTE_API char *lte_mod_string(lte_mod_t mod);
 
 LIBLTE_API uint32_t lte_mod_bits_x_symbol(lte_mod_t mod);

lte/phy/include/liblte/phy/phch/pdcch.h

@@ -44,12 +44,6 @@
 
 typedef _Complex float cf_t;
 
-#define NOF_COMMON_FORMATS      2
-const dci_format_t common_formats[NOF_COMMON_FORMATS] = { Format1A, Format1C };
-
-#define NOF_UE_FORMATS          2
-const dci_format_t ue_formats[NOF_UE_FORMATS] = { Format0, Format1 }; // 1A has the same payload as 0
-
 
 typedef enum LIBLTE_API {
   SEARCH_UE, SEARCH_COMMON

lte/phy/include/liblte/phy/phch/pdsch.h

@@ -43,7 +43,7 @@
 #include "liblte/phy/phch/dci.h"
 #include "liblte/phy/phch/regs.h"
 
-#define TDEC_ITERATIONS         1
+#define TDEC_ITERATIONS         6
 
 typedef _Complex float cf_t;
 
@@ -73,6 +73,7 @@ typedef struct LIBLTE_API {
   lte_cell_t cell;
   
   uint32_t max_symbols;
+  bool rnti_is_set; 
   uint16_t rnti; 
   
   /* buffers */
@@ -96,11 +97,13 @@ typedef struct LIBLTE_API {
 }pdsch_t;
 
 LIBLTE_API int pdsch_init(pdsch_t *q, 
-                          uint16_t user_rnti, 
                           lte_cell_t cell);
 
 LIBLTE_API void pdsch_free(pdsch_t *q);
 
+LIBLTE_API int pdsch_set_rnti(pdsch_t *q, 
+                               uint16_t rnti);
+
 LIBLTE_API int pdsch_harq_init(pdsch_harq_t *p, 
                                pdsch_t *pdsch);
 

lte/phy/include/liblte/phy/phch/ue_sync.h

@@ -0,0 +1,168 @@
+/**
+ *
+ * \section COPYRIGHT
+ *
+ * Copyright 2013-2014 The libLTE Developers. See the
+ * COPYRIGHT file at the top-level directory of this distribution.
+ *
+ * \section LICENSE
+ *
+ * This file is part of the libLTE library.
+ *
+ * libLTE is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * libLTE is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * A copy of the GNU Lesser General Public License can be found in
+ * the LICENSE file in the top-level directory of this distribution
+ * and at http://www.gnu.org/licenses/.
+ *
+ */
+
+#ifndef UE_SYNC_
+#define UE_SYNC_
+
+#include <stdbool.h>
+
+#include "liblte/config.h"
+#include "liblte/phy/sync/sync.h"
+#include "liblte/phy/sync/cfo.h"
+#include "liblte/phy/ch_estimation/chest.h"
+#include "liblte/phy/phch/pbch.h"
+#include "liblte/phy/common/fft.h"
+
+/**************************************************************
+ *
+ * This object automatically manages the cell association and
+ * synchronization procedure. By default, it associates with the 
+ * CELL whose correlation peak to average ratio is the highest. 
+ * 
+ * TODO: Associate with arbitrary CELL ID
+ * 
+ * The main function is ue_sync_get_buffer(), which returns a pointer
+ * to the aligned subframe of samples (before FFT). This function
+ * should be called regularly, returning every 1 ms. It reads from the 
+ * USRP, aligns the samples to the subframe and performs time/freq synch. 
+ *
+ * The function returns 0 during the cell association procedure, which includes
+ * PSS/SSS synchronization, MIB decoding from the PBCH and sampling frequency
+ * adjustment (according to signal bandwidth) and resynchronization. 
+ * 
+ * The function returns 1 when the signal is correctly acquired and the 
+ * returned buffer is aligned with the subframe. 
+ * 
+ * 
+ *************************************************************/
+
+typedef enum LIBLTE_API { SF_FIND, SF_TRACK} ue_sync_state_t;
+
+#define SYNC_PBCH_NOF_PRB       6
+#define SYNC_PBCH_NOF_PORTS     2
+
+#define TRACK_MAX_LOST          10
+#define PAR_THRESHOLD_FIND      20    
+
+#define NOF_MIB_DECODES         10
+
+#define MEASURE_EXEC_TIME 
+
+typedef struct LIBLTE_API {
+  sync_t s;
+
+  void *stream; 
+  double (*set_rate_callback)(void*, double);
+  int (*recv_callback)(void*, void*, uint32_t); 
+
+  ue_sync_state_t state;
+  
+  cf_t *input_buffer; 
+  cf_t *sf_symbols; 
+  cf_t *ce[SYNC_PBCH_NOF_PORTS];
+  
+  /* These count half frames (5ms) */
+  uint64_t frame_ok_cnt;
+  uint32_t frame_no_cnt; 
+  uint32_t frame_total_cnt; 
+  
+  /* this is the system frame number (SFN) */
+  uint32_t frame_number; 
+  
+  lte_cell_t cell; 
+  uint32_t sf_idx;
+  
+  cfo_t cfocorr;
+  float cur_cfo;
+  
+  /* Variables for PBCH decoding */
+  pbch_mib_t mib; 
+  lte_fft_t fft; 
+  chest_t chest; 
+  pbch_t pbch; 
+  bool pbch_initialized; 
+  uint32_t pbch_decoded; 
+  bool pbch_decode_always; 
+  bool pbch_decoder_enabled;
+  uint32_t pbch_last_trial;
+  
+  bool decode_sss_on_track; 
+  
+  uint32_t peak_idx;
+  int time_offset;
+  float mean_time_offset; 
+  #ifdef MEASURE_EXEC_TIME
+  float mean_exec_time;
+  #endif
+} ue_sync_t;
+
+
+LIBLTE_API int ue_sync_init(ue_sync_t *q, 
+                               double (set_rate_callback)(void*, double),
+                               int (recv_callback)(void*, void*, uint32_t), 
+                               void *stream_handler);
+
+LIBLTE_API void ue_sync_free(ue_sync_t *q);
+
+LIBLTE_API int ue_sync_get_buffer(ue_sync_t *q, 
+                                  cf_t **sf_symbols);
+
+
+LIBLTE_API void ue_sync_reset(ue_sync_t *q);
+
+LIBLTE_API void ue_sync_decode_sss_on_track(ue_sync_t *q, bool enabled);
+
+LIBLTE_API void ue_sync_pbch_enable(ue_sync_t *q, bool enabled); 
+
+LIBLTE_API void ue_sync_pbch_always(ue_sync_t *q, bool enabled); 
+
+LIBLTE_API void ue_sync_set_threshold(ue_sync_t *q, 
+                                      float threshold);
+
+LIBLTE_API ue_sync_state_t ue_sync_get_state(ue_sync_t *q);
+
+LIBLTE_API uint32_t ue_sync_get_sfidx(ue_sync_t *q);
+
+LIBLTE_API uint32_t ue_sync_get_peak_idx(ue_sync_t *q);
+
+LIBLTE_API lte_cell_t ue_sync_get_cell(ue_sync_t *q);
+
+LIBLTE_API pbch_mib_t ue_sync_get_mib(ue_sync_t *q);
+
+LIBLTE_API bool ue_sync_is_mib_decoded(ue_sync_t *q); 
+
+LIBLTE_API float ue_sync_get_cfo(ue_sync_t *q);
+
+LIBLTE_API float ue_sync_get_sfo(ue_sync_t *q);
+
+
+
+
+
+
+#endif // SYNC_FRAME_
+

lte/phy/include/liblte/phy/phy.h

@@ -54,6 +54,10 @@
 #include "liblte/phy/ch_estimation/chest.h"
 #include "liblte/phy/ch_estimation/refsignal.h"
 
+#include "liblte/phy/resampling/interp.h"
+#include "liblte/phy/resampling/decim.h"
+#include "liblte/phy/resampling/resample_arb.h"
+
 #include "liblte/phy/channel/ch_awgn.h"
 
 #include "liblte/phy/fec/viterbi.h"
@@ -88,18 +92,15 @@
 #include "liblte/phy/phch/pbch.h"
 #include "liblte/phy/phch/pcfich.h"
 #include "liblte/phy/phch/phich.h"
+#include "liblte/phy/phch/ue_sync.h"
+#include "liblte/phy/phch/ue_dl.h"
 
 #include "liblte/phy/scrambling/scrambling.h"
 
-#include "liblte/phy/resampling/interp.h"
-#include "liblte/phy/resampling/decim.h"
-#include "liblte/phy/resampling/resample_arb.h"
-
 #include "liblte/phy/sync/pss.h"
 #include "liblte/phy/sync/sfo.h"
 #include "liblte/phy/sync/sss.h"
 #include "liblte/phy/sync/sync.h"
-#include "liblte/phy/sync/sync_frame.h"
 #include "liblte/phy/sync/cfo.h"
 
 #ifdef __cplusplus

lte/phy/include/liblte/phy/resampling/interp.h

@@ -26,15 +26,73 @@
  */
 
 #ifndef INTERP_H
-#define INTERP_H_
+#define INTERP_H
+
+#include <stdint.h>
 
 #include "liblte/config.h"
 
 typedef _Complex float cf_t;
 
+typedef enum LIBLTE_API {LINEAR} interp_type_t;
+
+typedef struct LIBLTE_API {
+  interp_type_t type; 
+  
+  float *in_mag; 
+  float *in_arg;
+  float *in_mag0; 
+  float *in_arg0;
+  float *in_mag1; 
+  float *in_arg1;
+  
+  float *out_mag; 
+  float *out_arg;
+  float *out_arg2;
+  int16_t *table_idx; 
+  
+  cf_t *out_cexp;
+  cf_t *out_prod;
+  
+  cf_t *cexptable; 
+  
+  uint32_t len; 
+  uint32_t M; 
+  
+}interp_t;
+
+LIBLTE_API int interp_init(interp_t *q, 
+                           interp_type_t type, 
+                           uint32_t len,
+                           uint32_t M);
+
+LIBLTE_API void interp_free(interp_t *q); 
+
+LIBLTE_API void interp_run(interp_t *q, 
+                           cf_t *input, 
+                           cf_t *output);
+
+LIBLTE_API void interp_run_offset(interp_t *q, 
+                                  cf_t *input, 
+                                  cf_t *output, 
+                                  uint32_t off_st, 
+                                  uint32_t off_end);
+
+LIBLTE_API void interp_linear_offset(cf_t *input, 
+                                     cf_t *output, 
+                                     uint32_t M, 
+                                     uint32_t len, 
+                                     uint32_t off_st, 
+                                     uint32_t off_end);
+
+LIBLTE_API void interp_linear_c(cf_t *input, 
+                                cf_t *output, 
+                                uint32_t M, 
+                                uint32_t len);
 
-LIBLTE_API void interp_linear_offset(cf_t *input, cf_t *output, int M, int len, int off_st, int off_end);
+LIBLTE_API void interp_linear_f(float *input, 
-LIBLTE_API void interp_linear_c(cf_t *input, cf_t *output, int M, int len);
+                                float *output, 
-LIBLTE_API void interp_linear_f(float *input, float *output, int M, int len);
+                                uint32_t M, 
+                                uint32_t len);
 
 #endif // INTERP_H

lte/phy/include/liblte/phy/sync/cfo.h

@@ -49,10 +49,20 @@ typedef struct LIBLTE_API {
   cf_t *cur_cexp;
 }cfo_t;
 
-LIBLTE_API int cfo_init(cfo_t *h, int nsamples);
+LIBLTE_API int cfo_init(cfo_t *h, 
+                        uint32_t nsamples);
+
 LIBLTE_API void cfo_free(cfo_t *h);
 
-LIBLTE_API void cfo_set_tol(cfo_t *h, float tol);
+LIBLTE_API int cfo_realloc(cfo_t *h, 
-LIBLTE_API void cfo_correct(cfo_t *h, cf_t *x, float freq);
+                           uint32_t samples);
+
+LIBLTE_API void cfo_set_tol(cfo_t *h, 
+                            float tol);
+
+LIBLTE_API void cfo_correct(cfo_t *h, 
+                            cf_t *input,
+                            cf_t *output,
+                            float freq);
 
 #endif // CFO_

lte/phy/include/liblte/phy/sync/pss.h

@@ -42,7 +42,6 @@ typedef _Complex float cf_t; /* this is only a shortcut */
 #define DEFAULT_CORRELATION_TH 10000
 #define DEFAULT_NOSYNC_TIMEOUT  5
 
-#define PSS_LEN_FREQ   129    // FFT-based convolution removes 1 leaving it in 128
 #define PSS_LEN     62
 #define PSS_RE      6*12
 
@@ -67,50 +66,47 @@ typedef struct LIBLTE_API {
   conv_fft_cc_t conv_fft;
 #endif
 
-  int frame_size;
+  uint32_t frame_size;
-  int N_id_2;
+  uint32_t N_id_2;
+  uint32_t fft_size;
 
   cf_t *pss_signal_freq[3]; // One sequence for each N_id_2
   cf_t *tmp_input;
   float *conv_abs;
   cf_t *conv_output;
     
-#ifdef ENABLE_HL
-  cf_t *frame_buffer;
-  cf_t *tmp_nco;
-  float current_cfo;
-  bool cfo_auto;          
-  int nof_nosync_frames;
-  int nosync_timeout_frames;   
-  float correlation_threshold;  
-  int frame_start_idx;
-  int fb_wp;
-#endif
-  
-  
 }pss_synch_t;
 
 typedef enum { PSS_TX, PSS_RX } pss_direction_t;
 
 /* Basic functionality */
-LIBLTE_API int pss_synch_init(pss_synch_t *q, int frame_size);
+LIBLTE_API int pss_synch_init_fft(pss_synch_t *q, 
+                                  uint32_t frame_size, 
+                                  uint32_t fft_size);
+
+LIBLTE_API int pss_synch_init(pss_synch_t *q, 
+                              uint32_t frame_size);
+
 LIBLTE_API void pss_synch_free(pss_synch_t *q);
-LIBLTE_API int pss_generate(cf_t *signal, int N_id_2);
-LIBLTE_API void pss_put_slot(cf_t *pss_signal, cf_t *slot, int nof_prb, lte_cp_t cp);
 
-LIBLTE_API int pss_synch_set_N_id_2(pss_synch_t *q, int N_id_2);
+LIBLTE_API int pss_generate(cf_t *signal, 
-LIBLTE_API int pss_synch_find_pss(pss_synch_t *q, cf_t *input, float *corr_peak_value, float *corr_mean_value);
+                            uint32_t N_id_2);
-LIBLTE_API float pss_synch_cfo_compute(pss_synch_t* q, cf_t *pss_recv);
+
+LIBLTE_API void pss_put_slot(cf_t *pss_signal, 
+                             cf_t *slot, 
+                             uint32_t nof_prb, 
+                             lte_cp_t cp);
 
+LIBLTE_API int pss_synch_set_N_id_2(pss_synch_t *q, 
+                                    uint32_t N_id_2);
 
-/* Automatic frame management functions (for periodic calling) */
+LIBLTE_API int pss_synch_find_pss(pss_synch_t *q, 
-LIBLTE_API int pss_synch_periodic(pss_synch_t *q, cf_t *input, cf_t *output, int nsamples);
+                                  cf_t *input, 
-LIBLTE_API void pss_synch_set_timeout(pss_synch_t *q, int nof_frames);
+                                  float *corr_peak_value, 
-LIBLTE_API void pss_synch_set_threshold(pss_synch_t *q, float threshold);
+                                  float *corr_mean_value);
-LIBLTE_API void pss_synch_set_cfo_mode(pss_synch_t *q, bool cfo_auto);
-LIBLTE_API float pss_synch_get_cfo(pss_synch_t *q);
-LIBLTE_API int pss_synch_get_frame_start_idx(pss_synch_t *q);
 
+LIBLTE_API float pss_synch_cfo_compute(pss_synch_t* q, 
+                                       cf_t *pss_recv);
 
 
 /* High-level API */

lte/phy/include/liblte/phy/sync/sss.h

@@ -38,17 +38,12 @@
 
 typedef _Complex float cf_t; /* this is only a shortcut */
 
-/** gives the beginning of the SSS symbol (to be passed to sss_synch_m0m1).
- * subframe_sz is the length of the subframe, e.g. 1920 for the 1.9 MHz
- * symbol_sz is the OFDM symbol size (including CP), e.g. 137 for the 1.9 MHz
- */
-#define SSS_SYMBOL_ST(subframe_sz, symbol_sz) (subframe_sz/2-2*symbol_sz)
-#define SSS_POS_SYMBOL  33
 
-#define SSS_DFT_LEN 128
 #define N_SSS      31
 #define SSS_LEN    2*N_SSS
 
+#define SSS_MAX_FFT_LEN 2048
+
 struct sss_tables{
   int z1[N_SSS][N_SSS];
   int c[2][N_SSS];
@@ -56,7 +51,7 @@ struct sss_tables{
 };
 
 /* Allocate 32 complex to make it multiple of 32-byte AVX instructions alignment requirement.
- * Should use vect_malloc() to make it platform agnostic.
+ * Should use vec_malloc() to make it platform agnostic.
  */
 struct fc_tables{
   cf_t z1[N_SSS+1][N_SSS+1];
@@ -70,34 +65,67 @@ typedef struct LIBLTE_API {
 
   dft_plan_t dftp_input;
   
+  uint32_t fft_size;
+
   float corr_peak_threshold;
-  int symbol_sz;
+  uint32_t symbol_sz;
-  int subframe_sz;
+  uint32_t subframe_sz;
-  int N_id_2;
+  uint32_t N_id_2;
   
-  int N_id_1_table[30][30];
+  uint32_t N_id_1_table[30][30];
   struct fc_tables fc_tables[3]; // one for each N_id_2
 
 }sss_synch_t;
 
 
 /* Basic functionality */
-LIBLTE_API int sss_synch_init(sss_synch_t *q);
+LIBLTE_API int sss_synch_init(sss_synch_t *q,
+                              uint32_t fft_size);
+
+LIBLTE_API int sss_synch_realloc(sss_synch_t *q, 
+                                 uint32_t fft_size); 
+
 LIBLTE_API void sss_synch_free(sss_synch_t *q);
-LIBLTE_API void sss_generate(float *signal0, float *signal5, int cell_id);
-LIBLTE_API void sss_put_slot(float *sss, cf_t *symbol, int nof_prb, lte_cp_t cp);
 
-LIBLTE_API int sss_synch_set_N_id_2(sss_synch_t *q, int N_id_2);
+LIBLTE_API void sss_generate(float *signal0, 
+                             float *signal5, 
+                             uint32_t cell_id);
+
+LIBLTE_API void sss_put_slot(float *sss, 
+                             cf_t *symbol, 
+                             uint32_t nof_prb, 
+                             lte_cp_t cp);
+
+LIBLTE_API int sss_synch_set_N_id_2(sss_synch_t *q, 
+                                    uint32_t N_id_2);
+
+LIBLTE_API int sss_synch_m0m1(sss_synch_t *q, 
+                              cf_t *input, 
+                              uint32_t *m0, 
+                              float *m0_value, 
+                              uint32_t *m1, 
+                              float *m1_value);
+
+LIBLTE_API uint32_t sss_synch_subframe(uint32_t m0, 
+                                       uint32_t m1);
+
+LIBLTE_API int sss_synch_N_id_1(sss_synch_t *q, 
+                                uint32_t m0, 
+                                uint32_t m1);
+
+LIBLTE_API int sss_synch_frame(sss_synch_t *q, 
+                               cf_t *input, 
+                               uint32_t *subframe_idx, 
+                               uint32_t *N_id_1);
+
+LIBLTE_API void sss_synch_set_threshold(sss_synch_t *q, 
+                                        float threshold);
 
-LIBLTE_API void sss_synch_m0m1(sss_synch_t *q, cf_t *input, int *m0, float *m0_value,
+LIBLTE_API void sss_synch_set_symbol_sz(sss_synch_t *q, 
-    int *m1, float *m1_value);
+                                        uint32_t symbol_sz);
-LIBLTE_API int sss_synch_subframe(int m0, int m1);
-LIBLTE_API int sss_synch_N_id_1(sss_synch_t *q, int m0, int m1);
 
-LIBLTE_API int sss_synch_frame(sss_synch_t *q, cf_t *input, int *subframe_idx, int *N_id_1);
+LIBLTE_API void sss_synch_set_subframe_sz(sss_synch_t *q, 
-LIBLTE_API void sss_synch_set_threshold(sss_synch_t *q, float threshold);
+                                          uint32_t subframe_sz);
-LIBLTE_API void sss_synch_set_symbol_sz(sss_synch_t *q, int symbol_sz);
-LIBLTE_API void sss_synch_set_subframe_sz(sss_synch_t *q, int subframe_sz);
 
 
 /* High-level API */
@@ -105,18 +133,18 @@ LIBLTE_API void sss_synch_set_subframe_sz(sss_synch_t *q, int subframe_sz);
 typedef struct LIBLTE_API {
   sss_synch_t obj;
   struct sss_synch_init {
-    int N_id_2;
+    uint32_t N_id_2;
   } init;
   cf_t *input;
-  int in_len;
+  uint32_t in_len;
   struct sss_synch_ctrl_in {
-    int symbol_sz;
+    uint32_t symbol_sz;
-    int subframe_sz;
+    uint32_t subframe_sz;
-    int correlation_threshold;
+    uint32_t correlation_threshold;
   } ctrl_in;
   struct sss_synch_ctrl_out {
-    int subframe_idx;
+    uint32_t subframe_idx;
-    int N_id_1;
+    uint32_t N_id_1;
   } ctrl_out;
 }sss_synch_hl;
 

lte/phy/include/liblte/phy/sync/sync.h

@@ -30,11 +30,15 @@
 #define SYNC_
 
 #include <stdbool.h>
+#include <math.h>
 
 #include "liblte/config.h"
 #include "liblte/phy/sync/pss.h"
 #include "liblte/phy/sync/sss.h"
 
+#define FFT_SIZE_MIN    64
+#define FFT_SIZE_MAX    2048
+
 /**
  *
  * This object performs time and frequency synchronization using the PSS and SSS signals.
@@ -49,19 +53,19 @@
 
 enum sync_pss_det { ABSOLUTE, PEAK_MEAN};
 
-#define TRACK_THRESHOLD  10.0
-#define TRACK_LEN        300
-
 typedef struct LIBLTE_API {
-  pss_synch_t pss; 
+  pss_synch_t pss_find; 
   pss_synch_t pss_track; 
   sss_synch_t sss;
   enum sync_pss_det pss_mode;
-  float threshold;
+  float find_threshold;
+  float track_threshold;
   float peak_to_avg;
-  int N_id_2;
+  uint32_t N_id_2;
-  int N_id_1;
+  uint32_t N_id_1;
-  int slot_id;
+  uint32_t slot_id;
+  uint32_t fft_size;
+  uint32_t find_frame_size;
   float cfo;
   bool detect_cp;
   bool sss_en;
@@ -69,42 +73,72 @@ typedef struct LIBLTE_API {
 }sync_t;
 
 
-LIBLTE_API int sync_init(sync_t *q, int frame_size);
+LIBLTE_API int sync_init(sync_t *q, 
+                         uint32_t find_frame_size, 
+                         uint32_t track_frame_size,
+                         uint32_t fft_size);
+
 LIBLTE_API void sync_free(sync_t *q);
 
+LIBLTE_API int sync_realloc(sync_t *q,
+                            uint32_t find_frame_size, 
+                            uint32_t track_frame_size,
+                            uint32_t fft_size);
+
 /* Finds a correlation peak in the input signal. The signal must be sampled at 1.92 MHz and should be 
  subframe_size long at least */
-LIBLTE_API int sync_find(sync_t *q, cf_t *input);
+LIBLTE_API int sync_find(sync_t *q, 
+                         cf_t *input,
+                         uint32_t *peak_position);
 
 /* Tracks the correlation peak in the input signal. The signal must be sampled at 1.92 MHz and should be 
  TRACK_LEN long at least */
-LIBLTE_API int sync_track(sync_t *q, cf_t *input);
+LIBLTE_API int sync_track(sync_t *q, 
+                          cf_t *input,
+                          uint32_t offset, 
+                          uint32_t *peak_position);
 
 /* Sets the threshold for peak comparison */
-LIBLTE_API void sync_set_threshold(sync_t *q, float threshold);
+LIBLTE_API void sync_set_threshold(sync_t *q, 
+                                   float find_threshold,
+                                   float track_threshold);
+
 /* Set peak comparison to absolute value */
 LIBLTE_API void sync_pss_det_absolute(sync_t *q);
+
 /* Set peak comparison to relative to the mean */
 LIBLTE_API void sync_pss_det_peak_to_avg(sync_t *q);
 
 /* Gets the slot id (0 or 10) */
-LIBLTE_API int sync_get_slot_id(sync_t *q);
+LIBLTE_API uint32_t sync_get_slot_id(sync_t *q);
+
 /* Gets the last peak-to-average ratio */
 LIBLTE_API float sync_get_peak_to_avg(sync_t *q);
+
 /* Gets the N_id_2 from the last call to synch_run() */
-LIBLTE_API int sync_get_N_id_2(sync_t *q);
+LIBLTE_API uint32_t sync_get_N_id_2(sync_t *q);
+
 /* Gets the N_id_1 from the last call to synch_run() */
-LIBLTE_API int sync_get_N_id_1(sync_t *q);
+LIBLTE_API uint32_t sync_get_N_id_1(sync_t *q);
+
 /* Gets the Physical CellId from the last call to synch_run() */
 LIBLTE_API int sync_get_cell_id(sync_t *q);
+
 /* Gets the CFO estimation from the last call to synch_run() */
 LIBLTE_API float sync_get_cfo(sync_t *q);
+
 /* Gets the CP length estimation from the last call to synch_run() */
 LIBLTE_API lte_cp_t sync_get_cp(sync_t *q);
+
 /* Enables/Disables SSS detection  */
-LIBLTE_API void sync_sss_en(sync_t *q, bool enabled);
+LIBLTE_API void sync_sss_en(sync_t *q, 
+                            bool enabled);
+
+LIBLTE_API bool sync_sss_detected(sync_t *q);
+
 /* Enables/Disables CP detection  */
-LIBLTE_API void sync_cp_en(sync_t *q, bool enabled);
+LIBLTE_API void sync_cp_en(sync_t *q, 
+                           bool enabled);
 
 #endif // SYNC_
 

lte/phy/include/liblte/phy/sync/sync_frame.h

@@ -1,111 +0,0 @@
-/**
- *
- * \section COPYRIGHT
- *
- * Copyright 2013-2014 The libLTE Developers. See the
- * COPYRIGHT file at the top-level directory of this distribution.
- *
- * \section LICENSE
- *
- * This file is part of the libLTE library.
- *
- * libLTE is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as
- * published by the Free Software Foundation, either version 3 of
- * the License, or (at your option) any later version.
- *
- * libLTE is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Lesser General Public License for more details.
- *
- * A copy of the GNU Lesser General Public License can be found in
- * the LICENSE file in the top-level directory of this distribution
- * and at http://www.gnu.org/licenses/.
- *
- */
-
-#ifndef SYNC_FRAME_
-#define SYNC_FRAME_
-
-#include <stdbool.h>
-
-#include "liblte/config.h"
-#include "liblte/phy/sync/sync.h"
-#include "liblte/phy/sync/cfo.h"
-
-/**
- *
- * Uses sync object to automatically manage the FIND and TRACKING states. 
- * It is suposed to work on a subframe basis. The input signal must be sampled at 
- * a frequency integer multiple of 1.92 MHz. The signal is internally downsampled 
- * and fed to the sync object. 
- * 
- * This object also deals with frame alignment and CFO correction, returning an 
- * output signal aligned both in time and frequency. 
- */
-
-enum sync_frame_state { SF_FIND, SF_TRACK };
-
-#define SYNC_SF_LEN      1920  // 1ms at 1.92 MHz
-
-#define TRACK_MAX_LOST   10
-
-
-typedef struct LIBLTE_API {
-  sync_t s;
-  enum sync_frame_state state;
-  uint32_t downsampling; 
-  resample_arb_t resample;
-  unsigned long frame_cnt;
-  bool fb_wp; 
-  uint32_t frame_size; 
-  cf_t *input_buffer; 
-  cf_t *input_downsampled;
-  cfo_t cfocorr;
-  float cur_cfo;
-  uint32_t peak_idx;
-  uint32_t cell_id;
-  float timeoffset; 
-  uint32_t last_found;
-  uint32_t sf_idx;
-}sync_frame_t;
-
-
-/* Initializes the automatic tracker, setting the downsampling ratio for the input signal. 
- * downsampling is the ratio of the provided signal sampling frequency to 1.92 Mhz. E.g. if input is sampled at 3.84 Mhz, 
- * downsampling should be 2.
-*/
-LIBLTE_API int sync_frame_init(sync_frame_t *q, 
-                               uint32_t downsampling);
-
-LIBLTE_API void sync_frame_free(sync_frame_t *q);
-
-LIBLTE_API void sync_frame_set_threshold(sync_frame_t *q, 
-                                         float threshold);
-
-LIBLTE_API uint32_t sync_frame_cell_id(sync_frame_t *q);
-
-LIBLTE_API uint32_t sync_frame_sfidx(sync_frame_t *q);
-
-/* Automatically time/freq synchronizes the input signal. Returns 1 if the signal is synched and locked, 
- * and fills the output buffer with the time and frequency aligned version of the signal.
- * If 0 is returned, the PSS was not found. -1 is returned in case of error. 
- * 
- * The provided signal can be sampled at an integer multiple of 1.92 Mhz. 
- * The sampling ratio is provided when calling the sync_auto_reset() function. 
- * 
- * The buffer input must have subframe_size samples (used in sync_init)
- */
-LIBLTE_API int sync_frame_push(sync_frame_t *q, 
-                               cf_t *input, 
-                               cf_t *output);
-
-/* Resets the automatic tracker */
-LIBLTE_API void sync_frame_reset(sync_frame_t *q);
-
-
-
-
-#endif // SYNC_FRAME_
-

lte/phy/include/liblte/phy/utils/cexptab.h

@@ -30,19 +30,28 @@
 #define CEXPTAB_
 
 #include <complex.h>
+#include <stdint.h>
 #include "liblte/config.h"
 
 typedef _Complex float cf_t;
 
 typedef struct LIBLTE_API {
-  int size;
+  uint32_t size;
   cf_t *tab;
 }cexptab_t;
 
-LIBLTE_API int cexptab_init(cexptab_t *nco, int size);
+LIBLTE_API int cexptab_init(cexptab_t *nco, 
+                            uint32_t size);
+
 LIBLTE_API void cexptab_free(cexptab_t *nco);
 
-LIBLTE_API void cexptab_gen(cexptab_t *nco, cf_t *x, float freq, int len);
+LIBLTE_API void cexptab_gen(cexptab_t *nco, 
-LIBLTE_API void cexptab_gen_direct(cf_t *x, float freq, int len);
+                            cf_t *x, 
+                            float freq, 
+                            uint32_t len);
+
+LIBLTE_API void cexptab_gen_direct(cf_t *x, 
+                                   float freq, 
+                                   uint32_t len);
 
 #endif // CEXPTAB_

lte/phy/include/liblte/phy/utils/convolution.h

@@ -32,23 +32,36 @@
 #include "liblte/config.h"
 #include "liblte/phy/utils/dft.h"
 
+typedef _Complex float cf_t;
+
 typedef struct LIBLTE_API {
-  _Complex float *input_fft;
+  cf_t *input_fft;
-  _Complex float *filter_fft;
+  cf_t *filter_fft;
-  _Complex float *output_fft;
+  cf_t *output_fft;
-  _Complex float *output_fft2;
+  cf_t *output_fft2;
-  int input_len;
+  uint32_t input_len;
-  int filter_len;
+  uint32_t filter_len;
-  int output_len;
+  uint32_t output_len;
   dft_plan_t input_plan;
   dft_plan_t filter_plan;
   dft_plan_t output_plan;
 }conv_fft_cc_t;
 
-LIBLTE_API int conv_fft_cc_init(conv_fft_cc_t *state, int input_len, int filter_len);
+LIBLTE_API int conv_fft_cc_init(conv_fft_cc_t *q, 
-LIBLTE_API void conv_fft_cc_free(conv_fft_cc_t *state);
+                                uint32_t input_len, 
-LIBLTE_API int conv_fft_cc_run(conv_fft_cc_t *state, _Complex float *input, _Complex float *filter, _Complex float *output);
+                                uint32_t filter_len);
+
+LIBLTE_API void conv_fft_cc_free(conv_fft_cc_t *q);
+
+LIBLTE_API uint32_t conv_fft_cc_run(conv_fft_cc_t *q, 
+                               cf_t *input, 
+                               cf_t *filter, 
+                               cf_t *output);
 
-LIBLTE_API int conv_cc(_Complex float *input, _Complex float *filter, _Complex float *output, int input_len, int filter_len);
+LIBLTE_API uint32_t conv_cc(cf_t *input, 
+                       cf_t *filter, 
+                       cf_t *output, 
+                       uint32_t input_len, 
+                       uint32_t filter_len);
 
 #endif // CONVOLUTION_H_

lte/phy/include/liblte/phy/utils/vector.h

@@ -30,51 +30,74 @@
 #define VECTOR_
 
 #include <stdio.h>
+#include <stdint.h>
 #include "liblte/config.h"
 
 typedef _Complex float cf_t;
 
 /** Return the sum of all the elements */
-LIBLTE_API int vec_acc_ii(int *x, int len);
+LIBLTE_API int vec_acc_ii(int *x, uint32_t len);
-LIBLTE_API float vec_acc_ff(float *x, int len);
+LIBLTE_API float vec_acc_ff(float *x, uint32_t len);
-LIBLTE_API cf_t vec_acc_cc(cf_t *x, int len);
+LIBLTE_API cf_t vec_acc_cc(cf_t *x, uint32_t len);
 
-LIBLTE_API void *vec_malloc(int size);
+LIBLTE_API void *vec_malloc(uint32_t size);
+
+LIBLTE_API void *vec_realloc(void *ptr, uint32_t old_size, uint32_t new_size);
 
 /* print vectors */
-LIBLTE_API void vec_fprint_c(FILE *stream, cf_t *x, int len);
+LIBLTE_API void vec_fprint_c(FILE *stream, cf_t *x, uint32_t len);
-LIBLTE_API void vec_fprint_f(FILE *stream, float *x, int len);
+LIBLTE_API void vec_fprint_f(FILE *stream, float *x, uint32_t len);
-LIBLTE_API void vec_fprint_b(FILE *stream, char *x, int len);
+LIBLTE_API void vec_fprint_b(FILE *stream, char *x, uint32_t len);
-LIBLTE_API void vec_fprint_i(FILE *stream, int *x, int len);
+LIBLTE_API void vec_fprint_i(FILE *stream, int *x, uint32_t len);
+LIBLTE_API void vec_fprint_hex(FILE *stream, char *x, uint32_t len);
+
+/* Saves a vector to a file */
+LIBLTE_API void vec_save_file(char *filename, void *buffer, uint32_t len);
 
 /* sum two vectors */
-LIBLTE_API void vec_sum_ch(char *z, char *x, char *y, int len);
+LIBLTE_API void vec_sum_ch(char *x, char *y, char *z, uint32_t len);
-LIBLTE_API void vec_sum_ccc(cf_t *z, cf_t *x, cf_t *y, int len);
+LIBLTE_API void vec_sum_ccc(cf_t *x, cf_t *y, cf_t *z, uint32_t len);
+
+/* substract two vectors z=x-y */
+LIBLTE_API void vec_sub_fff(float *x, float *y, float *z, uint32_t len); 
 
 /* scalar product */
-LIBLTE_API void vec_sc_prod_cfc(cf_t *x, float h, cf_t *z, int len);
+LIBLTE_API void vec_sc_prod_cfc(cf_t *x, float h, cf_t *z, uint32_t len);
-LIBLTE_API void vec_sc_prod_ccc(cf_t *x, cf_t h, cf_t *z, int len);
+LIBLTE_API void vec_sc_prod_ccc(cf_t *x, cf_t h, cf_t *z, uint32_t len);
+LIBLTE_API void vec_sc_prod_fff(float *x, float h, float *z, uint32_t len); 
+
+LIBLTE_API void vec_convert_fi(float *x, int16_t *z, float scale, uint32_t len);
+
+LIBLTE_API void vec_deinterleave_cf(cf_t *x, float *real, float *imag, uint32_t len); 
 
 /* vector product (element-wise) */
-LIBLTE_API void vec_prod_ccc(cf_t *x, cf_t *y, cf_t *z, int len);
+LIBLTE_API void vec_prod_ccc(cf_t *x, cf_t *y, cf_t *z, uint32_t len);
-LIBLTE_API void vec_prod_ccc_unalign(cf_t *x, cf_t *y, cf_t *z, int len);
+
+/* vector product (element-wise) */
+LIBLTE_API void vec_prod_cfc(cf_t *x, float *y, cf_t *z, uint32_t len);
+
+LIBLTE_API cf_t vec_dot_prod_ccc(cf_t *x, cf_t *y, uint32_t len);
+LIBLTE_API float vec_dot_prod_fff(float *x, float *y, uint32_t len);
 
 /* z=x/y vector division (element-wise) */
-LIBLTE_API void vec_div_ccc(cf_t *x, cf_t *y, cf_t *z, int len);
+LIBLTE_API void vec_div_ccc(cf_t *x, cf_t *y, cf_t *z, uint32_t len);
 
 /* conjugate */
-LIBLTE_API void vec_conj_cc(cf_t *x, cf_t *y, int len);
+LIBLTE_API void vec_conj_cc(cf_t *x, cf_t *y, uint32_t len);
 
 /* average vector power */
-LIBLTE_API float vec_avg_power_cf(cf_t *x, int len);
+LIBLTE_API float vec_avg_power_cf(cf_t *x, uint32_t len);
 
 /* return the index of the maximum value in the vector */
-LIBLTE_API int vec_max_fi(float *x, int len);
+LIBLTE_API uint32_t vec_max_fi(float *x, uint32_t len);
 
 /* quantify vector of floats and convert to unsigned char */
-LIBLTE_API void vec_quant_fuc(float *in, unsigned char *out, float gain, float offset, float clip, int len);
+LIBLTE_API void vec_quant_fuc(float *in, unsigned char *out, float gain, float offset, float clip, uint32_t len);
 
 /* magnitude of each vector element */
-LIBLTE_API void vec_abs_cf(cf_t *x, float *abs, int len);
+LIBLTE_API void vec_abs_cf(cf_t *x, float *abs, uint32_t len);
+
+/* argument of each vector element */
+LIBLTE_API void vec_arg_cf(cf_t *x, float *arg, uint32_t len);
 
 #endif // VECTOR_

lte/phy/lib/ch_estimation/src/chest.c

@@ -32,13 +32,14 @@
 #include <math.h>
 
 #include "liblte/phy/ch_estimation/chest.h"
-#include "liblte/phy/resampling/interp.h"
 #include "liblte/phy/utils/vector.h"
 #include "liblte/phy/utils/debug.h"
 
 #define SLOT_SZ(q) (q->nof_symbols * q->symbol_sz)
 #define SF_SZ(q) (2 * SLOT_SZ(q))
 
+//#define VOLK_INTERP
+
 void chest_fprint(chest_t *q, FILE *stream, uint32_t nslot, uint32_t port_id) {
   chest_ref_fprint(q, stream, nslot, port_id);
   chest_recvsig_fprint(q, stream, nslot, port_id);
@@ -102,6 +103,7 @@ int chest_ce_ref(chest_t *q, cf_t *input, uint32_t nslot, uint32_t port_id, uint
       port_id   <  q->nof_ports) 
   {
     if (nref < q->refsignal[port_id][nslot].nof_refs) {
+
       fidx = q->refsignal[port_id][nslot].refs[nref].freq_idx; // reference frequency index
       tidx = q->refsignal[port_id][nslot].refs[nref].time_idx; // reference time index
 
@@ -153,10 +155,15 @@ int chest_ce_slot_port(chest_t *q, cf_t *input, cf_t *ce, uint32_t nslot, uint32
       /* interpolate the symbols with references
       * in the freq domain */
       for (i=0;i<r->nsymbols;i++) {
+#ifdef VOLK_INTERP
+        interp_run_offset(&q->interp_freq[port_id], 
+                          &r->ch_est[i * r->nof_refs/2], &ce[r->symbols_ref[i] * q->nof_re], 
+                          r->voffset, RE_X_RB/2-r->voffset);
+#else
         interp_linear_offset(&r->ch_est[i * r->nof_refs/2],
             &ce[r->symbols_ref[i] * q->nof_re], RE_X_RB/2,
             r->nof_refs/2, r->voffset, RE_X_RB/2-r->voffset);
-
+#endif
       }
       /* now interpolate in the time domain */
       for (i=0;i<q->nof_re; i++) {
@@ -164,8 +171,13 @@ int chest_ce_slot_port(chest_t *q, cf_t *input, cf_t *ce, uint32_t nslot, uint32
           for (j=0;j<r->nsymbols;j++) {
             x[j] = ce[r->symbols_ref[j] * q->nof_re + i];
           }
+#ifdef VOLK_INTERP
+          interp_run_offset(&q->interp_time[port_id], x, y, 
+                            r->symbols_ref[0], 3);
+#else
           interp_linear_offset(x, y, r->symbols_ref[1]-r->symbols_ref[0],
               2, r->symbols_ref[0], 3);
+#endif
         } else {
           for (j=0;j<MAX_NSYMB;j++) {
             y[j] = ce[r->symbols_ref[0] * q->nof_re + i];
@@ -225,7 +237,7 @@ int chest_ce_sf(chest_t *q, cf_t *input, cf_t *ce[MAX_PORTS], uint32_t sf_idx) {
   return LIBLTE_SUCCESS;
 }
 
-int chest_init(chest_t *q, chest_interp_t interp, uint32_t nof_re, uint32_t nof_symbols, uint32_t nof_ports) {
+int chest_init(chest_t *q, uint32_t nof_re, uint32_t nof_symbols, uint32_t nof_ports) {
   int ret = LIBLTE_ERROR_INVALID_INPUTS;
   
   if (q         != NULL &&
@@ -237,11 +249,6 @@ int chest_init(chest_t *q, chest_interp_t interp, uint32_t nof_re, uint32_t nof_
     q->nof_symbols = nof_symbols;
     q->nof_re = nof_re;
       
-    switch(interp) {
-    case LINEAR:
-      q->interp = interp_linear_offset;
-    }
-
     INFO("Initializing channel estimator size %dx%d, nof_ports=%d\n",
         q->nof_symbols, q->nof_re, nof_ports);
 
@@ -250,9 +257,9 @@ int chest_init(chest_t *q, chest_interp_t interp, uint32_t nof_re, uint32_t nof_
   return ret;
 }
 
-int chest_init_LTEDL(chest_t *q, chest_interp_t interp, lte_cell_t cell) {
+int chest_init_LTEDL(chest_t *q, lte_cell_t cell) {
   int ret; 
-  ret = chest_init(q, interp, cell.nof_prb * RE_X_RB, CP_NSYMB(cell.cp), cell.nof_ports);
+  ret = chest_init(q, cell.nof_prb * RE_X_RB, CP_NSYMB(cell.cp), cell.nof_ports);
   if (ret != LIBLTE_SUCCESS) {
     return ret;
   } else {
@@ -268,6 +275,16 @@ int chest_ref_LTEDL_slot_port(chest_t *q, uint32_t nslot, uint32_t port_id, lte_
       nslot     < NSLOTS_X_FRAME)
   {
     ret = refsignal_init_LTEDL(&q->refsignal[port_id][nslot], port_id, nslot, cell);
+    
+    if (ret == LIBLTE_SUCCESS) {
+      if (nslot == 0) {
+        ret = interp_init(&q->interp_freq[port_id], LINEAR, q->refsignal[port_id][nslot].nof_refs/2, RE_X_RB/2);
+        if (ret == LIBLTE_SUCCESS) {
+          ret = interp_init(&q->interp_time[port_id], LINEAR, 2, 
+                    q->refsignal[port_id][nslot].symbols_ref[1] - q->refsignal[port_id][nslot].symbols_ref[0]);
+        }
+      }
+    }
   }
   return ret;
 }
@@ -339,7 +356,7 @@ int chest_initialize(chest_hl* h) {
   cell.nof_prb = h->init.nof_prb;
   cell.cp = h->init.nof_symbols == CPNORM_NSYMB ? CPNORM : CPEXT;
   
-  if (chest_init_LTEDL(&h->obj, LINEAR, cell)) {
+  if (chest_init_LTEDL(&h->obj, cell)) {
     fprintf(stderr, "Error initializing equalizer\n");
     return -1;
   }

lte/phy/lib/ch_estimation/test/chest_test.c

@@ -162,7 +162,7 @@ int main(int argc, char **argv) {
 
   while(cid <= max_cid) {
     cell.id = cid; 
-    if (chest_init_LTEDL(&eq, LINEAR, cell)) {
+    if (chest_init_LTEDL(&eq, cell)) {
       fprintf(stderr, "Error initializing equalizer\n");
       goto do_exit;
     }

lte/phy/lib/common/src/phy_common.c

@@ -65,6 +65,23 @@ bool lte_cell_isvalid(lte_cell_t *cell) {
   }
 }
 
+bool lte_N_id_2_isvalid(uint32_t N_id_2) {
+  if (N_id_2 < 3) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+bool lte_N_id_1_isvalid(uint32_t N_id_1) {
+  if (N_id_1 < 169) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+
 /*
  * Returns Turbo coder interleaver size for Table 5.1.3-3 (36.212) index
  */
@@ -106,6 +123,14 @@ uint32_t lte_mod_bits_x_symbol(lte_mod_t mod) {
   }   
 }
 
+char *lte_cp_string(lte_cp_t cp) {
+  if (cp == CPNORM) {
+    return "Normal";
+  } else {
+    return "Extended";
+  }
+}
+
 /*
  * Finds index of minimum K>=long_cb in Table 5.1.3-3 of 36.212
  */
@@ -130,6 +155,7 @@ int lte_sampling_freq_hz(uint32_t nof_prb) {
       return 15000 * n;
     }
 }
+
 int lte_symbol_sz(uint32_t nof_prb) {
   if (nof_prb<=0) {
     return LIBLTE_ERROR;
@@ -150,6 +176,18 @@ int lte_symbol_sz(uint32_t nof_prb) {
   return LIBLTE_ERROR;
 }
 
+bool lte_symbol_sz_isvalid(uint32_t symbol_sz) {
+  if (symbol_sz == 128  || 
+      symbol_sz == 256  ||
+      symbol_sz == 512  ||
+      symbol_sz == 1024 ||
+      symbol_sz == 2048) {
+    return true;
+  } else {
+    return false; 
+  }
+}
+
 uint32_t lte_voffset(uint32_t symbol_id, uint32_t cell_id, uint32_t nof_ports) {
   if (nof_ports == 1 && symbol_id==0) {
     return (cell_id+3) % 6;

lte/phy/lib/phch/src/dci.c

@@ -61,7 +61,7 @@ int dci_msg_to_ra_dl(dci_msg_t *msg, uint16_t msg_rnti, uint16_t c_rnti,
       return ret; 
     }
     
-    if (VERBOSE_ISINFO()) {
+    if (VERBOSE_ISDEBUG()) {
       dci_msg_type_fprint(stdout, type);    
     }
     if (type.type == PDSCH_SCHED) {
@@ -72,7 +72,7 @@ int dci_msg_to_ra_dl(dci_msg_t *msg, uint16_t msg_rnti, uint16_t c_rnti,
         return ret;
       } 
       
-      if (VERBOSE_ISINFO()) {
+      if (VERBOSE_ISDEBUG()) {
         ra_pdsch_fprint(stdout, ra_dl, cell.nof_prb);
       }
       

lte/phy/lib/phch/src/pdcch.c

@@ -50,6 +50,13 @@
 #define MIN(a,b) ((a>b)?b:a)
 
 
+#define NOF_COMMON_FORMATS      2
+const dci_format_t common_formats[NOF_COMMON_FORMATS] = { Format1A, Format1C };
+
+#define NOF_UE_FORMATS          2
+const dci_format_t ue_formats[NOF_UE_FORMATS] = { Format0, Format1 }; // 1A has the same payload as 0
+
+
 static void set_cfi(pdcch_t *q, uint32_t cfi) {
   if (cfi > 0 && cfi < 4) {
     q->nof_regs = (regs_pdcch_nregs(q->regs, cfi) / 9) * 9;
@@ -228,7 +235,8 @@ uint32_t pdcch_ue_locations(pdcch_t *q, dci_location_t *c, uint32_t max_candidat
  * Returns the number of candidates saved in the array c.   
  */
 uint32_t pdcch_common_locations(pdcch_t *q, dci_location_t *c, uint32_t max_candidates, 
-                                 uint32_t cfi) {
+                                uint32_t cfi) 
+{
   uint32_t i, l, L, k;
 
   set_cfi(q, cfi);
@@ -271,8 +279,8 @@ static int dci_decode(pdcch_t *q, float *e, char *data, uint32_t E, uint32_t nof
 
   if (q         != NULL         &&
       data      != NULL         &&
-      E         < q->max_bits   && 
+      E         <= q->max_bits   && 
-      nof_bits  < DCI_MAX_BITS)
+      nof_bits  <= DCI_MAX_BITS)
   {
 
     /* unrate matching */
@@ -301,6 +309,7 @@ static int dci_decode(pdcch_t *q, float *e, char *data, uint32_t E, uint32_t nof
     }
     return LIBLTE_SUCCESS;
   } else {
+    fprintf(stderr, "Invalid parameters: E: %d, max_bits: %d, nof_bits: %d\n", E, q->max_bits, nof_bits);
     return LIBLTE_ERROR_INVALID_INPUTS;
   }
 }

lte/phy/lib/phch/src/pdsch.c

@@ -171,7 +171,7 @@ int pdsch_get(pdsch_t *q, cf_t *sf_symbols, cf_t *pdsch_symbols,
 }
 
 /** Initializes the PDCCH transmitter and receiver */
-int pdsch_init(pdsch_t *q, uint16_t user_rnti, lte_cell_t cell) {
+int pdsch_init(pdsch_t *q, lte_cell_t cell) {
   int ret = LIBLTE_ERROR_INVALID_INPUTS;
   int i;
 
@@ -183,7 +183,6 @@ int pdsch_init(pdsch_t *q, uint16_t user_rnti, lte_cell_t cell) {
     ret = LIBLTE_ERROR;
     
     q->cell = cell;
-    q->rnti = user_rnti;
     
     q->max_symbols = q->cell.nof_prb * MAX_PDSCH_RE(q->cell.cp);
 
@@ -205,12 +204,7 @@ int pdsch_init(pdsch_t *q, uint16_t user_rnti, lte_cell_t cell) {
     demod_soft_init(&q->demod);
     demod_soft_alg_set(&q->demod, APPROX);
     
-    for (i = 0; i < NSUBFRAMES_X_FRAME; i++) {
+    q->rnti_is_set = false; 
-      if (sequence_pdsch(&q->seq_pdsch[i], q->rnti, 0, 2 * i, q->cell.id,
-          q->max_symbols * q->mod[3].nbits_x_symbol)) {
-        goto clean;
-      }
-    }
 
     if (tcod_init(&q->encoder, MAX_LONG_CB)) {
       goto clean;
@@ -304,8 +298,20 @@ void pdsch_free(pdsch_t *q) {
 
 }
 
+int pdsch_set_rnti(pdsch_t *q, uint16_t rnti) {
+  uint32_t i;
+  for (i = 0; i < NSUBFRAMES_X_FRAME; i++) {
+    if (sequence_pdsch(&q->seq_pdsch[i], rnti, 0, 2 * i, q->cell.id,
+        q->max_symbols * q->mod[3].nbits_x_symbol)) {
+      return LIBLTE_ERROR; 
+    }
+  }
+  q->rnti_is_set = true; 
+  q->rnti = rnti; 
+  return LIBLTE_SUCCESS;
+}
 /* Calculate Codeblock Segmentation as in Section 5.1.2 of 36.212 */
-int codeblock_segmentation(struct cb_segm *s, uint32_t tbs) {
+static int codeblock_segmentation(struct cb_segm *s, uint32_t tbs) {
   uint32_t Bp, B, idx1;
   int ret; 
   
@@ -499,7 +505,7 @@ int pdsch_decode_tb(pdsch_t *q, char *data, uint32_t tbs, uint32_t nb_e,
         n_e = nb_e - rp;
       }
 
-      INFO("CB#%d: cb_len: %d, rlen: %d, wp: %d, rp: %d, F: %d, E: %d\n", i,
+      DEBUG("CB#%d: cb_len: %d, rlen: %d, wp: %d, rp: %d, F: %d, E: %d\n", i,
           cb_len, rlen - F, wp, rp, F, n_e);
 
       /* Rate Unmatching */
@@ -526,7 +532,7 @@ int pdsch_decode_tb(pdsch_t *q, char *data, uint32_t tbs, uint32_t nb_e,
       if (i < harq_process->cb_segm.C - 1) {
         memcpy(&data[wp], &q->cb_in[F], (rlen - F) * sizeof(char));
       } else {
-        INFO("Last CB, appending parity: %d to %d from %d and 24 from %d\n",
+        DEBUG("Last CB, appending parity: %d to %d from %d and 24 from %d\n",
             rlen - F - 24, wp, F, rlen - 24);
         /* Append Transport Block parity bits to the last CB */
         memcpy(&data[wp], &q->cb_in[F], (rlen - F - 24) * sizeof(char));
@@ -538,7 +544,7 @@ int pdsch_decode_tb(pdsch_t *q, char *data, uint32_t tbs, uint32_t nb_e,
       rp += n_e;
     }
 
-    INFO("END CB#%d: wp: %d, rp: %d\n", i, wp, rp);
+    DEBUG("END CB#%d: wp: %d, rp: %d\n", i, wp, rp);
 
     // Compute transport block CRC
     par_rx = crc_checksum(&q->crc_tb, data, tbs);
@@ -577,7 +583,8 @@ int pdsch_decode(pdsch_t *q, cf_t *sf_symbols, cf_t *ce[MAX_PORTS], char *data,
       sf_symbols            != NULL &&
       data                  != NULL &&
       subframe              <  10   &&
-      harq_process     != NULL)
+      harq_process          != NULL && 
+      harq_process->mcs.mod > 0)
   {
     
     nof_bits = harq_process->mcs.tbs;
@@ -585,8 +592,8 @@ int pdsch_decode(pdsch_t *q, cf_t *sf_symbols, cf_t *ce[MAX_PORTS], char *data,
     nof_bits_e = nof_symbols * q->mod[harq_process->mcs.mod - 1].nbits_x_symbol;
 
 
-    INFO("Decoding PDSCH SF: %d, Mod %d, NofBits: %d, NofSymbols: %d, NofBitsE: %d\n",
+    INFO("Decoding PDSCH SF: %d, Mod %d, NofBits: %d, NofSymbols: %d, NofBitsE: %d, rv_idx: %d\n",
-        subframe, harq_process->mcs.mod, nof_bits, nof_symbols, nof_bits_e);
+        subframe, harq_process->mcs.mod, nof_bits, nof_symbols, nof_bits_e, rv_idx);
 
     /* number of layers equals number of ports */
     for (i = 0; i < q->cell.nof_ports; i++) {
@@ -651,12 +658,14 @@ int pdsch_encode_tb(pdsch_t *q, char *data, uint32_t tbs, uint32_t nb_e,
   uint32_t i;
   uint32_t cb_len, rp, wp, rlen, F, n_e;
   char *e_bits = q->pdsch_e;
+  int ret = LIBLTE_ERROR_INVALID_INPUTS; 
   
   if (q             != NULL &&
       data          != NULL &&
       nb_e          <  q->max_symbols * q->mod[3].nbits_x_symbol)
   {
   
+    if (q->rnti_is_set) {
       if (rv_idx == 0) {
         /* Compute transport block CRC */
         par = crc_checksum(&q->crc_tb, data, tbs);
@@ -746,11 +755,13 @@ int pdsch_encode_tb(pdsch_t *q, char *data, uint32_t tbs, uint32_t nb_e,
 
       INFO("END CB#%d: wp: %d, rp: %d\n", i, wp, rp);
       
-    return LIBLTE_SUCCESS;
+      ret = LIBLTE_SUCCESS;      
     } else {
-    return LIBLTE_ERROR_INVALID_INPUTS;
+      fprintf(stderr, "Must call pdsch_set_rnti() to set the encoder/decoder RNTI\n");  
     }
   } 
+  return ret; 
+}
 
 /** Converts the PDSCH data bits to symbols mapped to the slot ready for transmission
  */
@@ -761,6 +772,7 @@ int pdsch_encode(pdsch_t *q, char *data, cf_t *sf_symbols[MAX_PORTS], uint32_t s
   uint32_t nof_symbols, nof_bits, nof_bits_e;
   /* Set pointers for layermapping & precoding */
   cf_t *x[MAX_LAYERS];
+   int ret = LIBLTE_ERROR_INVALID_INPUTS; 
    
    if (q             != NULL &&
        data          != NULL &&
@@ -768,6 +780,7 @@ int pdsch_encode(pdsch_t *q, char *data, cf_t *sf_symbols[MAX_PORTS], uint32_t s
        harq_process  != NULL)
   {
 
+    if (q->rnti_is_set) {
       for (i=0;i<q->cell.nof_ports;i++) {
         if (sf_symbols[i] == NULL) {
           return LIBLTE_ERROR_INVALID_INPUTS;
@@ -808,7 +821,6 @@ int pdsch_encode(pdsch_t *q, char *data, cf_t *sf_symbols[MAX_PORTS], uint32_t s
         return LIBLTE_ERROR;
       }
       
-
       scrambling_b_offset(&q->seq_pdsch[subframe], (char*) q->pdsch_e, 0, nof_bits_e);
 
       mod_modulate(&q->mod[harq_process->mcs.mod - 1], (char*) q->pdsch_e, q->pdsch_d, nof_bits_e);
@@ -826,9 +838,11 @@ int pdsch_encode(pdsch_t *q, char *data, cf_t *sf_symbols[MAX_PORTS], uint32_t s
       for (i = 0; i < q->cell.nof_ports; i++) {
         pdsch_put(q, q->pdsch_symbols[i], sf_symbols[i], &harq_process->prb_alloc, subframe);
       }
-    return LIBLTE_SUCCESS;
+      ret = LIBLTE_SUCCESS;
     } else {
-    return LIBLTE_ERROR_INVALID_INPUTS;
+     fprintf(stderr, "Must call pdsch_set_rnti() to set the encoder/decoder RNTI\n");       
+    }
   } 
+  return ret; 
 }
   

lte/phy/lib/phch/src/ue_sync.c

@@ -0,0 +1,555 @@
+/**
+ *
+ * \section COPYRIGHT
+ *
+ * Copyright 2013-2014 The libLTE Developers. See the
+ * COPYRIGHT file at the top-level directory of this distribution.
+ *
+ * \section LICENSE
+ *
+ * This file is part of the libLTE library.
+ *
+ * libLTE is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * libLTE is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * A copy of the GNU Lesser General Public License can be found in
+ * the LICENSE file in the top-level directory of this distribution
+ * and at http://www.gnu.org/licenses/.
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <assert.h>
+#include <unistd.h>
+
+
+#include "liblte/phy/phch/ue_sync.h"
+
+#include "liblte/phy/utils/debug.h"
+#include "liblte/phy/utils/vector.h"
+
+#define MAX_TIME_OFFSET 128
+cf_t dummy[MAX_TIME_OFFSET];
+
+#define EXPAVERAGE(data, average, nframes) ((data + average * nframes) / (nframes + 1))  
+
+#define CURRENT_FFTSIZE   lte_symbol_sz(q->cell.nof_prb)
+#define CURRENT_SFLEN     SF_LEN(CURRENT_FFTSIZE, q->cell.cp)
+
+#define CURRENT_SLOTLEN_RE SLOT_LEN_RE(q->cell.nof_prb, q->cell.cp)
+#define CURRENT_SFLEN_RE SF_LEN_RE(q->cell.nof_prb, q->cell.cp)
+
+#define MAXIMUM_SFLEN       SF_LEN(2048, CPNORM)
+#define MAXIMUM_SFLEN_RE    SF_LEN_RE(110, CPNORM)
+
+static int mib_decoder_initialize(ue_sync_t *q);
+static void mib_decoder_free(ue_sync_t *q);
+
+int ue_sync_init(ue_sync_t *q, 
+                    double (set_rate_callback)(void*, double),
+                    int (recv_callback)(void*, void*, uint32_t),
+                    void *stream_handler) 
+{
+  int ret = LIBLTE_ERROR_INVALID_INPUTS;
+  
+  if (q                   != NULL && 
+      stream_handler      != NULL)
+  {
+    ret = LIBLTE_ERROR;
+    
+    bzero(q, sizeof(ue_sync_t));
+
+    ue_sync_reset(q);
+
+    q->cell.nof_prb = SYNC_PBCH_NOF_PRB;
+    q->cell.nof_ports = SYNC_PBCH_NOF_PORTS; 
+    q->cell.id = 0; 
+    q->cell.cp = CPNORM;
+    
+    q->pbch_decoded = false; 
+    q->pbch_initialized = false; 
+    q->pbch_decoder_enabled = true; 
+    q->pbch_decode_always = false; 
+    q->decode_sss_on_track = false; 
+    
+    q->stream = stream_handler;
+    q->recv_callback = recv_callback;
+    q->set_rate_callback = set_rate_callback;
+    
+    INFO("Setting sampling frequency 1.92 MHz\n",0);
+    q->set_rate_callback(q->stream, 1920000.0);
+    
+    if(sync_init(&q->s, CURRENT_SFLEN, CURRENT_FFTSIZE, CURRENT_FFTSIZE)) {
+      goto clean_exit;
+    }
+    
+    sync_pss_det_peak_to_avg(&q->s);
+    
+    if (cfo_init(&q->cfocorr, MAXIMUM_SFLEN)) {
+      fprintf(stderr, "Error initiating CFO\n");
+      goto clean_exit;
+    }
+   
+    q->input_buffer = vec_malloc(3 * MAXIMUM_SFLEN * sizeof(cf_t));
+    if (!q->input_buffer) {
+      perror("malloc");
+      goto clean_exit;
+    }
+    
+    q->sf_symbols = vec_malloc(MAXIMUM_SFLEN_RE * sizeof(cf_t));
+    if (!q->sf_symbols) {
+      perror("malloc");
+      goto clean_exit; 
+    }
+    for (int i=0;i<SYNC_PBCH_NOF_PORTS;i++) {
+      q->ce[i] = vec_malloc(MAXIMUM_SFLEN_RE * sizeof(cf_t));
+      if (!q->ce[i]) {
+        perror("malloc");
+        goto clean_exit; 
+      }
+    }
+   
+    //float th = PAR_THRESHOLD_FIND * (1+(float) CURRENT_FFTSIZE/128/10);
+    sync_set_threshold(&q->s, PAR_THRESHOLD_FIND, PAR_THRESHOLD_FIND/4);
+    
+    ret = LIBLTE_SUCCESS;
+  }
+  
+clean_exit:
+  if (ret == LIBLTE_ERROR) {
+    ue_sync_free(q);
+  }
+  return ret; 
+}
+
+void ue_sync_free(ue_sync_t *q) {
+  if (q->input_buffer) {
+    free(q->input_buffer);
+  }
+  if (q->sf_symbols) {
+    free(q->sf_symbols);
+  }
+  for (int i=0;i<SYNC_PBCH_NOF_PORTS;i++) {
+    if (q->ce[i]) {
+      free(q->ce[i]);
+    }
+  }
+  mib_decoder_free(q);
+  cfo_free(&q->cfocorr);
+  sync_free(&q->s);
+}
+
+void ue_sync_set_threshold(ue_sync_t *q, float threshold) {
+  sync_set_threshold(&q->s, threshold, threshold/2);
+}
+
+lte_cell_t ue_sync_get_cell(ue_sync_t *q) {
+  return q->cell;
+}
+
+pbch_mib_t ue_sync_get_mib(ue_sync_t *q) {
+  return q->mib;
+}
+
+uint32_t ue_sync_peak_idx(ue_sync_t *q) {
+  return q->peak_idx;
+}
+
+ue_sync_state_t ue_sync_get_state(ue_sync_t *q) {
+  return q->state;
+}
+
+static int update_srate(ue_sync_t *q) {
+  struct timeval t[3];
+    
+  gettimeofday(&t[1], NULL);
+  if (sync_realloc(&q->s, CURRENT_SFLEN, CURRENT_FFTSIZE, CURRENT_FFTSIZE)) {
+    fprintf(stderr, "Error realloc'ing SYNC\n");
+    return LIBLTE_ERROR;
+  }
+  gettimeofday(&t[2], NULL);
+  get_time_interval(t);
+  
+  if (NOF_MIB_DECODES > 1) {
+    mib_decoder_free(q);  
+    if (mib_decoder_initialize(q)) {
+      fprintf(stderr, "Error reinitializing MIB decoder\n");
+      return LIBLTE_ERROR; 
+    }
+  }  
+
+  // Finally set the new sampling rate
+  q->set_rate_callback(q->stream, (float) lte_sampling_freq_hz(q->cell.nof_prb));
+ 
+  ue_sync_reset(q);
+  printf("Set sampling rate %.2f MHz, fft_size=%d, sf_len=%d Texec=%d us\n", 
+       (float) lte_sampling_freq_hz(q->cell.nof_prb)/1000000, 
+       CURRENT_FFTSIZE, CURRENT_SFLEN, (int) t[0].tv_usec);
+  
+  return LIBLTE_SUCCESS;
+}
+
+uint32_t ue_sync_get_sfidx(ue_sync_t *q) {
+  return q->sf_idx;    
+}
+
+float ue_sync_get_cfo(ue_sync_t *q) {
+  return 15000 * q->cur_cfo;
+}
+
+float ue_sync_get_sfo(ue_sync_t *q) {
+  return 1000*q->mean_time_offset/5;
+}
+
+bool ue_sync_is_mib_decoded(ue_sync_t *q) {
+  return q->pbch_decoded;
+}
+
+void ue_sync_pbch_enable(ue_sync_t *q, bool enabled) {
+  q->pbch_decoder_enabled = enabled; 
+}
+
+void ue_sync_pbch_always(ue_sync_t *q, bool enabled) {
+  q->pbch_decode_always = enabled;
+}
+
+void ue_sync_decode_sss_on_track(ue_sync_t *q, bool enabled) {
+  q->decode_sss_on_track = enabled; 
+}
+
+static int mib_decoder_initialize(ue_sync_t *q) {
+    
+  if (lte_fft_init(&q->fft, q->cell.cp, q->cell.nof_prb)) {
+    fprintf(stderr, "Error initializing FFT\n");
+    return -1;
+  }
+  if (chest_init_LTEDL(&q->chest, q->cell)) {
+    fprintf(stderr, "Error initializing reference signal\n");
+    return -1;
+  }
+  if (pbch_init(&q->pbch, q->cell)) {
+    fprintf(stderr, "Error initiating PBCH\n");
+    return -1;
+  }
+  q->pbch_initialized = 1;
+  DEBUG("PBCH initiated cell_id=%d\n", q->cell.id);
+  
+  return 0;
+}
+
+static void mib_decoder_free(ue_sync_t *q) {
+  chest_free(&q->chest);
+  pbch_free(&q->pbch);
+  lte_fft_free(&q->fft);
+}
+
+static int mib_decoder_run(ue_sync_t *q) {
+  int ret; 
+  
+  /* Run FFT for the second slot */
+  lte_fft_run_sf(&q->fft, q->input_buffer, q->sf_symbols);
+
+  /* Get channel estimates of slot #1 for each port */
+  chest_ce_sf(&q->chest, q->sf_symbols, q->ce, 0);
+  
+  if (q->pbch_last_trial && 
+    (q->frame_total_cnt - q->pbch_last_trial > 2)) 
+  {
+    pbch_decode_reset(&q->pbch);
+    INFO("Resetting PBCH decoder: last trial %d, now is %d\n", 
+         q->pbch_last_trial, q->frame_total_cnt);
+    q->pbch_last_trial = 0;
+  }
+  
+  if (pbch_decode(&q->pbch, q->sf_symbols, q->ce, &q->mib) == 1) {        
+    q->frame_number = q->mib.sfn; 
+    q->cell.nof_ports = q->mib.nof_ports;
+    q->cell.nof_prb = q->mib.nof_prb;
+    
+    if (!q->pbch_decoded) {
+      printf("MIB decoded:\n");
+      pbch_mib_fprint(stdout, &q->mib);
+      ret = update_srate(q);
+    } else { 
+      INFO("MIB decoded #%d SFN: %d\n", q->pbch_decoded, q->mib.sfn);
+    }
+    q->pbch_decoded++;
+    
+    pbch_decode_reset(&q->pbch);
+
+  } else {
+    INFO("MIB not decoded: %d\n", q->frame_total_cnt);
+    q->pbch_last_trial = q->frame_total_cnt;
+  }
+  
+  return ret; 
+}
+
+static int find_peak_ok(ue_sync_t *q) {
+  int ret; 
+  
+  if (q->peak_idx < CURRENT_SFLEN) {
+    /* Receive the rest of the next subframe */
+    if (q->recv_callback(q->stream, &q->input_buffer[CURRENT_SFLEN], q->peak_idx+CURRENT_SFLEN/2) < 0) {
+      return LIBLTE_ERROR;
+    }
+  }
+  
+  if (sync_sss_detected(&q->s)) {
+    ret = sync_get_cell_id(&q->s);
+    if (ret >= 0) {
+      q->cell.id = (uint32_t) ret;
+      q->cell.cp = sync_get_cp(&q->s);
+    }
+    
+    /* Get the subframe index (0 or 5) */
+    q->sf_idx = sync_get_slot_id(&q->s)/2;
+   
+    /* Reset variables */ 
+    q->frame_ok_cnt = 0;
+    q->frame_no_cnt = 0;
+    q->frame_total_cnt = 0;       
+
+    /* Goto Tracking state */
+    q->state = SF_TRACK;      
+    ret = LIBLTE_SUCCESS;
+  
+    INFO("Found peak %d, SF_idx: %d, Cell_id: %d CP: %s\n", 
+        q->peak_idx, q->sf_idx, q->cell.id, lte_cp_string(q->cell.cp));       
+    
+    if (q->peak_idx < CURRENT_SFLEN) {
+      q->sf_idx++;
+    }
+    
+    return ret;
+  } else {
+    INFO("Found peak at %d, SSS not detected\n", q->peak_idx);
+    return 0;
+  }
+}
+
+int track_peak_ok(ue_sync_t *q, uint32_t track_idx) {
+  int ret = LIBLTE_SUCCESS; 
+  
+   /* Make sure subframe idx is what we expect */
+  if ((q->sf_idx != sync_get_slot_id(&q->s)/2) && q->decode_sss_on_track) {
+    printf("\nWarning: Expected SF idx %d but got %d!\n", 
+          q->sf_idx, sync_get_slot_id(&q->s)/2);
+    q->sf_idx = sync_get_slot_id(&q->s)/2;
+  } else {
+    q->time_offset = ((int) track_idx - (int) CURRENT_FFTSIZE); 
+
+    /* If the PSS peak is beyond the frame (we sample too slowly), 
+      discard the offseted samples to align next frame */
+    if (q->time_offset > 0 && q->time_offset < MAX_TIME_OFFSET) {
+      ret = q->recv_callback(q->stream, dummy, (uint32_t) q->time_offset);        
+    } else {
+      ret = LIBLTE_SUCCESS;
+    }
+    
+    /* compute cumulative moving average CFO */
+    q->cur_cfo = EXPAVERAGE(sync_get_cfo(&q->s), q->cur_cfo, q->frame_ok_cnt);
+    
+    /* compute cumulative moving average time offset */
+    q->mean_time_offset = (float) EXPAVERAGE((float) q->time_offset, q->mean_time_offset, q->frame_ok_cnt);
+
+    q->peak_idx = CURRENT_SFLEN/2 + q->time_offset;  
+    q->frame_ok_cnt++;
+    q->frame_no_cnt = 0;
+    
+    
+    if (ret >= LIBLTE_SUCCESS) {
+      ret = LIBLTE_SUCCESS; 
+    }
+  }
+  
+  return ret;
+}
+
+int track_peak_no(ue_sync_t *q) {
+  
+  /* if we missed too many PSS go back to FIND */
+  q->frame_no_cnt++; 
+  if (q->frame_no_cnt >= TRACK_MAX_LOST) {
+    printf("\n%d frames lost. Going back to FIND\n", (int) q->frame_no_cnt);
+    q->state = SF_FIND;
+  } else {
+    INFO("Tracking peak not found, %d lost\n", (int) q->frame_no_cnt);    
+  }
+
+  return LIBLTE_SUCCESS;
+}
+
+static int receive_samples(ue_sync_t *q) {
+  
+  /* A negative time offset means there are samples in our buffer for the next subframe, 
+   because we are sampling too fast. 
+  */
+  if (q->time_offset < 0) {
+    q->time_offset = -q->time_offset;
+  } 
+  /* copy last part of the last subframe (use move since there could be overlapping) */
+  memmove(q->input_buffer, &q->input_buffer[CURRENT_SFLEN-q->time_offset], q->time_offset*sizeof(cf_t));
+
+  /* Get 1 subframe from the USRP getting more samples and keeping the previous samples, if any */  
+  if (q->recv_callback(q->stream, &q->input_buffer[q->time_offset], CURRENT_SFLEN - q->time_offset) < 0) {
+    return LIBLTE_ERROR;
+  }
+  
+  /* reset time offset */
+  q->time_offset = 0;
+
+  return LIBLTE_SUCCESS; 
+}
+
+int ue_sync_get_buffer(ue_sync_t *q, cf_t **sf_symbols) {
+  int ret = LIBLTE_ERROR_INVALID_INPUTS; 
+  uint32_t track_idx; 
+  struct timeval t[3];
+
+  if (q               != NULL   &&
+      sf_symbols      != NULL   &&
+      q->input_buffer != NULL)
+  {
+    
+    if (receive_samples(q)) {
+      fprintf(stderr, "Error receiving samples\n");
+      return -1;
+    }
+    
+    switch (q->state) {
+      case SF_FIND:
+        q->s.sss_en = true; 
+        
+        /* Find peak and cell id */
+        ret = sync_find(&q->s, q->input_buffer, &q->peak_idx);
+        if (ret < 0) {
+          fprintf(stderr, "Error finding correlation peak (%d)\n", ret);
+          return -1;
+        }
+        
+        DEBUG("Find PAR=%.2f\n", sync_get_peak_to_avg(&q->s));
+        
+        if (ret == 1) {
+          ret = find_peak_ok(q);
+          /* Initialize PBCH decoder */
+          if (ret == LIBLTE_SUCCESS) {
+            if (!q->pbch_initialized && q->pbch_decoder_enabled) {
+              ret = mib_decoder_initialize(q);
+              if (ret < 0) {
+                fprintf(stderr, "Error initializing MIB decoder\n");
+              }
+            }
+          } else if (ret < 0) {
+            if (ret < 0) {
+              fprintf(stderr, "Error processing find peak \n");
+            }
+          }
+        } 
+      break;
+      case SF_TRACK:
+        ret = LIBLTE_SUCCESS;
+        
+        q->s.sss_en = q->decode_sss_on_track; 
+        
+        q->sf_idx = (q->sf_idx + 1) % 10;
+
+        DEBUG("TRACK: SF=%d FrameCNT: %d\n", q->sf_idx, q->frame_total_cnt);
+        
+        /* Every SF idx 0 and 5, find peak around known position q->peak_idx */
+        if (q->sf_idx == 0 || q->sf_idx == 5) {
+
+          #ifdef MEASURE_EXEC_TIME
+          gettimeofday(&t[1], NULL);
+          #endif
+          
+          track_idx = 0; 
+          
+          /* track pss around the middle of the subframe, where the PSS is */
+          ret = sync_track(&q->s, q->input_buffer, CURRENT_SFLEN/2-CURRENT_FFTSIZE, &track_idx);
+          if (ret < 0) {
+            fprintf(stderr, "Error tracking correlation peak\n");
+            return -1;
+          }
+          
+          #ifdef MEASURE_EXEC_TIME
+          gettimeofday(&t[2], NULL);
+          get_time_interval(t);
+          q->mean_exec_time = (float) EXPAVERAGE((float) t[0].tv_usec, q->mean_exec_time, q->frame_total_cnt);
+          #endif
+
+          if (ret == 1) {
+            ret = track_peak_ok(q, track_idx);
+          } else {
+            ret = track_peak_no(q); 
+          }
+          
+          INFO("TRACK %3d: SF=%d Track_idx=%d Offset=%d CFO: %f\n", 
+                (int) q->frame_total_cnt, q->sf_idx, track_idx, q->time_offset, sync_get_cfo(&q->s));
+          
+          q->frame_total_cnt++; 
+          
+          if (ret == LIBLTE_ERROR) {
+            fprintf(stderr, "Error processing tracking peak\n");
+            ue_sync_reset(q);
+            return LIBLTE_SUCCESS;
+          } 
+        }
+        
+        /* Do CFO Correction and deliver the frame */
+        cfo_correct(&q->cfocorr, q->input_buffer, q->input_buffer, -q->cur_cfo / CURRENT_FFTSIZE);         
+        *sf_symbols = q->input_buffer;
+        
+        /* At subframe 0, try to decode PBCH if not yet decoded */
+        if (q->sf_idx == 0) {
+          if(q->pbch_decoder_enabled                     &&
+            (q->pbch_decoded < NOF_MIB_DECODES || q->pbch_decode_always)) 
+          {
+            mib_decoder_run(q);
+          } else {
+            q->mib.sfn = (q->mib.sfn + 1) % 1024;
+          }
+        }
+
+        if (ret == LIBLTE_SUCCESS) {
+          if (q->pbch_decoder_enabled) {
+            if (q->pbch_decoded >= NOF_MIB_DECODES) {
+              ret = 1; 
+            } else {
+              ret = 0;
+            }
+          } else {
+            ret = 1;
+          }
+        }
+      break;
+    }
+  }  
+  DEBUG("UE SYNC returns %d\n", ret);
+  return ret; 
+}
+
+void ue_sync_reset(ue_sync_t *q) {
+  q->state = SF_FIND;
+    
+  q->pbch_last_trial = 0; 
+  q->frame_ok_cnt = 0;
+  q->frame_no_cnt = 0;
+  q->frame_total_cnt = 0; 
+  q->cur_cfo = 0;
+  q->mean_time_offset = 0;
+  q->time_offset = 0;
+  #ifdef MEASURE_EXEC_TIME
+  q->mean_exec_time = 0;
+  #endif
+}
+

lte/phy/lib/phch/test/CMakeLists.txt

@@ -19,6 +19,23 @@
 # and at http://www.gnu.org/licenses/.
 #
 
+########################################################################
+# UE SYNC TEST (Only compiled if CUHD is available)
+########################################################################
+LIST(FIND OPTIONAL_LIBS cuhd CUHD_FIND)
+LIST(FIND OPTIONAL_LIBS graphics GRAPHICS_FIND)
+IF(${CUHD_FIND} GREATER -1)
+  ADD_EXECUTABLE(ue_sync_usrp ue_sync_usrp.c)
+  TARGET_LINK_LIBRARIES(ue_sync_usrp lte_phy cuhd)
+ENDIF(${CUHD_FIND} GREATER -1)
+
+IF(${GRAPHICS_FIND} EQUAL -1)
+  SET_TARGET_PROPERTIES(ue_sync_usrp PROPERTIES COMPILE_DEFINITIONS "DISABLE_GRAPHICS")
+ELSE(${GRAPHICS_FIND} EQUAL -1)
+  target_link_libraries(ue_sync_usrp graphics)
+ENDIF(${GRAPHICS_FIND} EQUAL -1)
+
+
 ########################################################################
 # PBCH TEST  
 ########################################################################

lte/phy/lib/phch/test/pbch_file_test.c

@@ -136,7 +136,7 @@ int base_init() {
     return -1;
   }
 
-  if (chest_init_LTEDL(&chest, LINEAR, cell)) {
+  if (chest_init_LTEDL(&chest, cell)) {
     fprintf(stderr, "Error initializing equalizer\n");
     return -1;
   }

lte/phy/lib/phch/test/pcfich_file_test.c

@@ -141,7 +141,7 @@ int base_init() {
     }
   }
   
-  if (chest_init_LTEDL(&chest, LINEAR, cell)) {
+  if (chest_init_LTEDL(&chest, cell)) {
     fprintf(stderr, "Error initializing equalizer\n");
     return -1;
   }

lte/phy/lib/phch/test/pdcch_file_test.c

@@ -155,7 +155,7 @@ int base_init() {
     }
   }
 
-  if (chest_init_LTEDL(&chest, LINEAR, cell)) {
+  if (chest_init_LTEDL(&chest, cell)) {
     fprintf(stderr, "Error initializing equalizer\n");
     return -1;
   }

lte/phy/lib/phch/test/pdsch_file_test.c

@@ -158,7 +158,7 @@ int base_init() {
     }
   }
 
-  if (chest_init_LTEDL(&chest, LINEAR, cell)) {
+  if (chest_init_LTEDL(&chest, cell)) {
     fprintf(stderr, "Error initializing equalizer\n");
     return -1;
   }
@@ -183,10 +183,11 @@ int base_init() {
     exit(-1);
   }
 
-  if (pdsch_init(&pdsch, rnti, cell)) {
+  if (pdsch_init(&pdsch, cell)) {
     fprintf(stderr, "Error creating PDSCH object\n");
     exit(-1);
   }
+  pdsch_set_rnti(&pdsch, rnti);
   
   if (pdsch_harq_init(&harq_process, &pdsch)) {
     fprintf(stderr, "Error initiating HARQ process\n");

lte/phy/lib/phch/test/pdsch_re_test.c

@@ -78,7 +78,8 @@ int main(int argc, char **argv) {
     cell.nof_ports = test_re_ports[i];
     cell.cp = test_re_cp[i];
 
-    pdsch_init(&pdsch, 0, cell);
+    pdsch_init(&pdsch, cell);
+    pdsch_set_rnti(&pdsch, 0);
 
     memset(prb_alloc.re_sf, 0, sizeof(uint32_t) * 10);
     prb_alloc.slot[0].nof_prb = test_re_prb[i];

lte/phy/lib/phch/test/pdsch_test.c

@@ -166,11 +166,13 @@ int main(int argc, char **argv) {
     goto quit;
   }
 
-  if (pdsch_init(&pdsch, 1234, cell)) {
+  if (pdsch_init(&pdsch, cell)) {
     fprintf(stderr, "Error creating PDSCH object\n");
     goto quit;
   }
   
+  pdsch_set_rnti(&pdsch, 1234);
+  
   if (pdsch_harq_init(&harq_process, &pdsch)) {
     fprintf(stderr, "Error initiating HARQ process\n");
     goto quit;

lte/phy/lib/phch/test/phich_file_test.c

@@ -166,7 +166,7 @@ int base_init() {
     }
   }
 
-  if (chest_init_LTEDL(&chest, LINEAR, cell)) {
+  if (chest_init_LTEDL(&chest, cell)) {
     fprintf(stderr, "Error initializing equalizer\n");
     return -1;
   }

lte/phy/lib/resampling/src/interp.c

@@ -27,12 +27,173 @@
 
 #include <complex.h>
 #include <math.h>
+#include <stdlib.h>
+
 #include "liblte/phy/resampling/interp.h"
+#include "liblte/phy/utils/vector.h"
 #include "liblte/phy/utils/debug.h"
 
+#define TABLE_SIZE      1024
+
+
+#ifdef TABLE_SIZE
+  #define ARG2IDX(arg) ((uint32_t) ((1+(arg)/M_PI)*TABLE_SIZE/2))
+  #define MYCEXP(arg) q->cexptable[ARG2IDX(arg)]
+#else
+  #define MYCEXP(arg) (cosf(arg) + I*sinf(arg))
+#endif
+
+#define MAX_OFFSET      64
+
+int interp_init(interp_t *q, interp_type_t type, uint32_t len, uint32_t M) {
+  int ret = LIBLTE_ERROR_INVALID_INPUTS; 
+  
+  if (q != NULL) {
+    ret = LIBLTE_ERROR; 
+    
+    q->in_arg = vec_malloc(len * sizeof(float));
+    if (!q->in_arg) {
+      goto clean_and_exit;
+    }
+    q->in_mag = vec_malloc(len * sizeof(float));
+    if (!q->in_mag) {
+      goto clean_and_exit;
+    }
+    q->out_arg = vec_malloc((MAX_OFFSET + M * len) * sizeof(float));
+    if (!q->out_arg) {
+      goto clean_and_exit;
+    }
+    q->out_arg2 = vec_malloc((MAX_OFFSET + M * len) * sizeof(float));
+    if (!q->out_arg2) {
+      goto clean_and_exit;
+    }
+    q->table_idx = vec_malloc((MAX_OFFSET + M * len) * sizeof(int16_t));
+    if (!q->table_idx) {
+      goto clean_and_exit;
+    }
+    q->out_mag = vec_malloc((MAX_OFFSET + M * len) * sizeof(float));
+    if (!q->out_mag) {
+      goto clean_and_exit;
+    }
+    q->out_cexp = vec_malloc((MAX_OFFSET + M * len) * sizeof(cf_t));
+    if (!q->out_cexp) {
+      goto clean_and_exit;
+    }
+    q->out_prod = vec_malloc((MAX_OFFSET + M * len) * sizeof(cf_t));
+    if (!q->out_prod) {
+      goto clean_and_exit;
+    }
+#ifdef TABLE_SIZE
+    q->cexptable = vec_malloc(TABLE_SIZE * sizeof(cf_t));
+    uint32_t i;
+    for (i=0;i<TABLE_SIZE;i++) {
+      q->cexptable[i] = cexpf(I*M_PI*(2*((float) i/TABLE_SIZE) - 1));
+    }
+#endif
+    q->M = M; 
+    q->len = len; 
+    ret = LIBLTE_SUCCESS;
+  }
+  
+clean_and_exit:
+  if (ret == LIBLTE_ERROR) {
+    interp_free(q);
+  }
+  return ret; 
+}
+
+void interp_free(interp_t *q) {
+  if (q) {
+    if (q->in_arg) {
+      free(q->in_arg);
+    }
+    if (q->in_mag) {
+      free(q->in_mag);
+    }
+    if (q->out_arg) {
+      free(q->out_arg);
+    }
+    if (q->out_cexp) {
+      free(q->out_cexp);
+    }
+    if (q->out_mag) {
+      free(q->out_mag);
+    }
+    
+    if (q->out_prod) {
+      free(q->out_prod);
+    }
+#ifdef TABLE_SIZE
+    if (q->cexptable) {
+      free(q->cexptable);
+    }
+#endif
+  }
+}
+
+void interp_run_offset(interp_t *q, cf_t *input, cf_t *output, uint32_t off_st, uint32_t off_end) {
+  uint32_t i, j, n;
+  float mag0=0, mag1=0, arg0=0, arg1=0;
+  float dmag, darg; 
+  uint32_t M = q->M; 
+  uint32_t len1 = q->len-1;
+  
+  if (off_st + off_end < MAX_OFFSET) {
+    vec_abs_cf(input, q->in_mag, q->len);
+    vec_arg_cf(input, q->in_arg, q->len);   
+    
+    mag0 = q->in_mag[0];
+    mag1 = q->in_mag[1];
+    arg0 = q->in_arg[0];
+    arg1 = q->in_arg[1];
+    dmag=(mag1-mag0)/M;
+    darg=(arg1-arg0)/M; 
+    for (j=0;j<off_st;j++) {
+      q->out_mag[j] = mag0 - (j+1)*dmag;
+      q->out_arg[j] = arg0 - (j+1)*darg;
+    }
+    
+    for (i=0;i<len1;i++) {
+      mag0 = q->in_mag[i];
+      mag1 = q->in_mag[i+1];
+      arg0 = q->in_arg[i];
+      arg1 = q->in_arg[i+1];
+      dmag=(mag1-mag0)/M;
+      darg=(arg1-arg0)/M;
+      for (j=0;j<M;j++) {
+        q->out_mag[i*M+j+off_st] = mag0 + j*dmag;
+        q->out_arg[i*M+j+off_st] = arg0 + j*darg;
+      }
+    }
+    if (q->len > 1) {
+      for (j=0;j<off_end;j++) {
+        q->out_mag[i*M+j+off_st] = mag1 + j*dmag;
+        q->out_arg[i*M+j+off_st] = arg1 + j*darg;
+      }
+    }
+    uint32_t len=i*M+j+off_st;
+#ifdef TABLE_SIZE
+    vec_convert_fi(q->out_arg, q->table_idx, (float) TABLE_SIZE/2/M_PI, len);
+    for (n=0;n<len;n++) {
+      q->out_cexp[n] = q->cexptable[q->table_idx[n]+TABLE_SIZE/2];
+    }
+#else
+    for (n=0;n<len;n++) {
+      q->out_cexp[n] = MYCEXP(q->out_arg[n]);
+    }
+#endif
+    vec_prod_cfc(q->out_cexp, q->out_mag, output, len);
+  }
+
+}
+
+void interp_run(interp_t *q, cf_t *input, cf_t *output) {
+    interp_run_offset(q, input, output, 0, 1);
+}
+
 /* Performs 1st order linear interpolation with out-of-bound interpolation */
-void interp_linear_offset(cf_t *input, cf_t *output, int M, int len, int off_st, int off_end) {
+void interp_linear_offset(cf_t *input, cf_t *output, uint32_t M, uint32_t len, uint32_t off_st, uint32_t off_end) {
-  int i, j;
+  uint32_t i, j;
   float mag0=0, mag1=0, arg0=0, arg1=0, mag=0, arg=0;
 
   for (i=0;i<len-1;i++) {
@@ -63,14 +224,14 @@ void interp_linear_offset(cf_t *input, cf_t *output, int M, int len, int off_st,
 }
 
 /* Performs 1st order linear interpolation */
-void interp_linear_c(cf_t *input, cf_t *output, int M, int len) {
+void interp_linear_c(cf_t *input, cf_t *output, uint32_t M, uint32_t len) {
-  interp_linear_offset(input, output, M, len, 0, 0);
+  interp_linear_offset(input, output, M, len, 0, 1);
 }
 
 
-/* Performs 1st order integer linear interpolation */
+/* Performs 1st order uint32_teger linear interpolation */
-void interp_linear_f(float *input, float *output, int M, int len) {
+void interp_linear_f(float *input, float *output, uint32_t M, uint32_t len) {
-  int i, j;
+  uint32_t i, j;
   for (i=0;i<len-1;i++) {
     for (j=0;j<M;j++) {
       output[i*M+j] = input[i] + j * (input[i+1]-input[i]) / M;

lte/phy/lib/resampling/test/CMakeLists.txt

@@ -31,5 +31,7 @@ TARGET_LINK_LIBRARIES(resample_arb_bench lte_phy)
 
 ADD_TEST(resample resample_arb_test)
  
+ADD_EXECUTABLE(interp_test_volk interp_test_volk.c)
+TARGET_LINK_LIBRARIES(interp_test_volk lte_phy)
 
 

lte/phy/lib/sync/src/cfo.c

@@ -34,14 +34,14 @@
 #include "liblte/phy/utils/vector.h"
 #include "liblte/phy/utils/debug.h"
 
-int cfo_init(cfo_t *h, int nsamples) {
+int cfo_init(cfo_t *h, uint32_t nsamples) {
-  int ret = -1;
+  int ret = LIBLTE_ERROR;
   bzero(h, sizeof(cfo_t));
 
   if (cexptab_init(&h->tab, CFO_CEXPTAB_SIZE)) {
     goto clean;
   }
-  h->cur_cexp = malloc(sizeof(cf_t) * nsamples);
+  h->cur_cexp = vec_malloc(sizeof(cf_t) * nsamples);
   if (!h->cur_cexp) {
     goto clean;
   }
@@ -50,9 +50,9 @@ int cfo_init(cfo_t *h, int nsamples) {
   h->nsamples = nsamples;
   cexptab_gen(&h->tab, h->cur_cexp, h->last_freq, h->nsamples);
 
-  ret = 0;
+  ret = LIBLTE_SUCCESS;
 clean:
-  if (ret == -1) {
+  if (ret == LIBLTE_ERROR) {
     cfo_free(h);
   }
   return ret;
@@ -70,11 +70,23 @@ void cfo_set_tol(cfo_t *h, float tol) {
   h->tol = tol;
 }
 
-void cfo_correct(cfo_t *h, cf_t *x, float freq) {
+int cfo_realloc(cfo_t *h, uint32_t samples) {
+  h->cur_cexp = realloc(h->cur_cexp, sizeof(cf_t) * samples); 
+  if (!h->cur_cexp) {
+    perror("realloc");
+    return LIBLTE_ERROR;
+  }
+  cexptab_gen(&h->tab, h->cur_cexp, h->last_freq, samples);
+  h->nsamples = samples;
+  
+  return LIBLTE_SUCCESS;
+}
+
+void cfo_correct(cfo_t *h, cf_t *input, cf_t *output, float freq) {
   if (fabs(h->last_freq - freq) > h->tol) {
     h->last_freq = freq;
     cexptab_gen(&h->tab, h->cur_cexp, h->last_freq, h->nsamples);
-    INFO("CFO generating new table for frequency %.4f\n", freq);
+    DEBUG("CFO generating new table for frequency %.4f\n", freq);
   }
-  vec_prod_ccc(h->cur_cexp, x, x, h->nsamples);
+  vec_prod_ccc(h->cur_cexp, input, output, h->nsamples);
 }

lte/phy/lib/sync/src/find_sss.c

@@ -31,18 +31,10 @@
 #include "liblte/phy/utils/vector.h"
 #include "liblte/phy/sync/sss.h"
 
-cf_t corr_sz(cf_t *z, cf_t *s) {
+void corr_all_zs(cf_t *z, cf_t s[N_SSS+1][N_SSS+1], cf_t *output) {
-  cf_t sum;
+  uint32_t m;
-  cf_t zsprod[32];
-  vec_prod_ccc(z, s, zsprod, N_SSS - 1);
-  sum = vec_acc_cc(zsprod, N_SSS - 1);
-
-  return sum;
-}
-void corr_all_zs(cf_t *z, cf_t s[32][32], cf_t *output) {
-  int m;
   for (m = 0; m < N_SSS; m++) {
-    output[m] = corr_sz(z, s[m]);
+    output[m] = vec_dot_prod_ccc(z, s[m], N_SSS - 1);
   }
 }
 
@@ -58,22 +50,30 @@ void corr_all_zs(cf_t *z, cf_t s[32][32], cf_t *output) {
 
  *
  */
-void sss_synch_m0m1(sss_synch_t *q, cf_t *input, int *m0, float *m0_value,
+int sss_synch_m0m1(sss_synch_t *q, cf_t *input, uint32_t *m0, float *m0_value,
-    int *m1, float *m1_value) {
+    uint32_t *m1, float *m1_value) 
+{
+
+  int ret = LIBLTE_ERROR_INVALID_INPUTS; 
+
+  if (q                 != NULL   &&
+      input             != NULL   &&
+      m0                != NULL   && 
+      m1                != NULL)
+  {
     
-  /* This is aprox 3-4 kbytes of stack. Consider moving to sss_synch_t?? */
+    /* Consider moving to sss_synch_t?? */
     cf_t zdelay[N_SSS+1],zconj[N_SSS+1],zprod[N_SSS+1];
     cf_t y[2][N_SSS+1], z[N_SSS+1], tmp[N_SSS+1];
     float tmp_real[N_SSS+1];
-  cf_t input_fft[SSS_DFT_LEN];
+    cf_t input_fft[SSS_MAX_FFT_LEN];
-
+    uint32_t i;
-  int i;
 
     dft_run_c(&q->dftp_input, input, input_fft);
     
     for (i = 0; i < N_SSS; i++) {
-    y[0][i] = input_fft[SSS_POS_SYMBOL + 2 * i];
+      y[0][i] = input_fft[q->fft_size/2-N_SSS + 2 * i];
-    y[1][i] = input_fft[SSS_POS_SYMBOL + 2 * i + 1];
+      y[1][i] = input_fft[q->fft_size/2-N_SSS + 2 * i + 1];
     }
     
     vec_prod_ccc(y[0], q->fc_tables[q->N_id_2].c[0], z, N_SSS);
@@ -100,12 +100,14 @@ void sss_synch_m0m1(sss_synch_t *q, cf_t *input, int *m0, float *m0_value,
     if (m1_value) {
       *m1_value = tmp_real[*m1];
     }    
-
+    ret = LIBLTE_SUCCESS;
+  } 
+  return ret; 
 }
 
 void convert_tables(struct fc_tables *fc_tables, struct sss_tables *in) {
-  int i, j;
+  uint32_t i, j;
-  bzero(fc_tables, sizeof(struct fc_tables));
+
   for (i = 0; i < N_SSS; i++) {
     for (j = 0; j < N_SSS; j++) {
       __real__ fc_tables->z1[i][j] = (float) in->z1[i][j];

lte/phy/lib/sync/src/gen_sss.c

@@ -58,19 +58,19 @@ void generate_zsc_tilde(int *z_tilde, int *s_tilde, int *c_tilde) {
     z_tilde[i] = 1 - 2 * x[i];
 }
 
-void generate_m0m1(int N_id_1, int *m0, int *m1) {
+void generate_m0m1(uint32_t N_id_1, uint32_t *m0, uint32_t *m1) {
-  int q_prime = N_id_1 / (N_SSS - 1);
+  uint32_t q_prime = N_id_1 / (N_SSS - 1);
-  int q = (N_id_1 + (q_prime * (q_prime + 1) / 2)) / (N_SSS - 1);
+  uint32_t q = (N_id_1 + (q_prime * (q_prime + 1) / 2)) / (N_SSS - 1);
-  int m_prime = N_id_1 + (q * (q + 1) / 2);
+  uint32_t m_prime = N_id_1 + (q * (q + 1) / 2);
   *m0 = m_prime % N_SSS;
   *m1 = (*m0 + m_prime / N_SSS + 1) % N_SSS;
 }
 
 
 /* table[m0][m1-1]=N_id_1 */
-void generate_N_id_1_table(int table[30][30]) {
+void generate_N_id_1_table(uint32_t table[30][30]) {
-  int m0, m1;
+  uint32_t m0, m1;
-  int N_id_1;
+  uint32_t N_id_1;
   for (N_id_1=0;N_id_1<168;N_id_1++) {
     generate_m0m1(N_id_1, &m0, &m1);
     table[m0][m1-1] = N_id_1;
@@ -78,60 +78,60 @@ void generate_N_id_1_table(int table[30][30]) {
 }
 
 
-void generate_s(int *s, int *s_tilde, int m0_m1) {
+void generate_s(int *s, int *s_tilde, uint32_t m0_m1) {
-  int i;
+  uint32_t i;
   for (i = 0; i < N_SSS; i++) {
     s[i] = s_tilde[(i + m0_m1) % N_SSS];
   }
 }
 
 void generate_s_all(int s[N_SSS][N_SSS], int *s_tilde) {
-  int i;
+  uint32_t i;
   for (i = 0; i < N_SSS; i++) {
     generate_s(s[i], s_tilde, i);
   }
 }
 
-void generate_c(int *c, int *c_tilde, int N_id_2, int is_c0) {
+void generate_c(int *c, int *c_tilde, uint32_t N_id_2, bool is_c0) {
-  int i;
+  uint32_t i;
   for (i = 0; i < N_SSS; i++) {
-    c[i] = c_tilde[(i + N_id_2 + (is_c0 > 0 ? 3 : 0)) % N_SSS];
+    c[i] = c_tilde[(i + N_id_2 + (is_c0 ? 3 : 0)) % N_SSS];
   }
 }
 
-void generate_z(int *z, int *z_tilde, int m0_m1) {
+void generate_z(int *z, int *z_tilde, uint32_t m0_m1) {
-  int i;
+  uint32_t i;
   for (i = 0; i < N_SSS; i++) {
     z[i] = z_tilde[(i + (m0_m1 % 8)) % N_SSS];
   }
 }
 
 void generate_z_all(int z[N_SSS][N_SSS], int *z_tilde) {
-  int i;
+  uint32_t i;
   for (i = 0; i < N_SSS; i++) {
     generate_z(z[i], z_tilde, i);
   }
 }
 
-void generate_sss_all_tables(struct sss_tables *tables, int N_id_2) {
+void generate_sss_all_tables(struct sss_tables *tables, uint32_t N_id_2) {
-  int i;
+  uint32_t i;
   int s_t[N_SSS], c_t[N_SSS], z_t[N_SSS];
 
   generate_zsc_tilde(z_t, s_t, c_t);
   generate_s_all(tables->s, s_t);
   generate_z_all(tables->z1, z_t);
   for (i = 0; i < 2; i++) {
-    generate_c(tables->c[i], c_t, N_id_2, i);
+    generate_c(tables->c[i], c_t, N_id_2, i > 0);
   }
 }
 
-void sss_generate(float *signal0, float *signal5, int cell_id) {
+void sss_generate(float *signal0, float *signal5, uint32_t cell_id) {
 
-  int i;
+  uint32_t i;
-  int id1 = cell_id / 3;
+  uint32_t id1 = cell_id / 3;
-  int id2 = cell_id % 3;
+  uint32_t id2 = cell_id % 3;
-  int m0;
+  uint32_t m0;
-  int m1;
+  uint32_t m1;
   int s_t[N_SSS], c_t[N_SSS], z_t[N_SSS];
   int s0[N_SSS], s1[N_SSS], c0[N_SSS], c1[N_SSS], z1_0[N_SSS], z1_1[N_SSS];
 

lte/phy/lib/sync/src/pss.c

@@ -37,144 +37,142 @@
 #include "liblte/phy/utils/vector.h"
 #include "liblte/phy/utils/convolution.h"
 
-#define NOT_SYNC  0xF0F0F0F0
-
-
-int pss_synch_init_N_id_2(pss_synch_t *q, int N_id_2) {
-  q->N_id_2 = N_id_2;
 
+int pss_synch_init_N_id_2(cf_t *pss_signal_freq, uint32_t N_id_2, uint32_t fft_size) {
   dft_plan_t plan;
-  cf_t pss_signal_pad[PSS_LEN_FREQ];
+  cf_t pss_signal_pad[2048];
   cf_t pss_signal_time[PSS_LEN];
+  int ret = LIBLTE_ERROR_INVALID_INPUTS;
   
-  if (N_id_2 < 0 || N_id_2 > 2) {
+  if (lte_N_id_2_isvalid(N_id_2)    && 
-    fprintf(stderr, "Invalid N_id_2 %d\n", N_id_2);
+      fft_size                  < 2048) 
-    return -1;
+  {
-  }
     
     pss_generate(pss_signal_time, N_id_2);
 
-  memset(pss_signal_pad, 0, PSS_LEN_FREQ * sizeof(cf_t));
+    bzero(pss_signal_pad, fft_size * sizeof(cf_t));
-  memset(q->pss_signal_freq[N_id_2], 0, PSS_LEN_FREQ * sizeof(cf_t));
+    bzero(pss_signal_freq, fft_size * sizeof(cf_t));
-  memcpy(&pss_signal_pad[33], pss_signal_time, PSS_LEN * sizeof(cf_t));
+    memcpy(&pss_signal_pad[(fft_size-PSS_LEN)/2], pss_signal_time, PSS_LEN * sizeof(cf_t));
 
-  if (dft_plan(&plan, PSS_LEN_FREQ - 1, BACKWARD, COMPLEX)) {
+    if (dft_plan(&plan, fft_size, BACKWARD, COMPLEX)) {
-    return -1;
+      return LIBLTE_ERROR;
     }
+    
     dft_plan_set_mirror(&plan, true);
     dft_plan_set_dc(&plan, true);
-  dft_run_c(&plan, pss_signal_pad, q->pss_signal_freq[q->N_id_2]);
+    dft_run_c(&plan, pss_signal_pad, pss_signal_freq);
 
-  vec_sc_prod_cfc(q->pss_signal_freq[q->N_id_2], (float) 1 / (PSS_LEN_FREQ - 1),
+    vec_sc_prod_cfc(pss_signal_freq, (float) 1 / (fft_size), pss_signal_pad, fft_size);
-      pss_signal_pad, PSS_LEN_FREQ);
+    vec_conj_cc(pss_signal_pad, pss_signal_freq, fft_size);
-
-  vec_conj_cc(pss_signal_pad, q->pss_signal_freq[q->N_id_2], PSS_LEN_FREQ);
 
     dft_plan_free(&plan);
     
-  return 0;
+    ret = LIBLTE_SUCCESS;
+  }
+  return ret;
 }
 
-/* Initializes the object. subframe_size is the size, in samples, of the 1ms subframe
+/* Initializes the PSS synchronization object with fft_size=128
+ */
+int pss_synch_init(pss_synch_t *q, uint32_t frame_size) {
+  return pss_synch_init_fft(q, frame_size, 128);
+}
+/* Initializes the PSS synchronization object. 
  * 
+ * It correlates a signal of frame_size samples with the PSS sequence in the frequency 
+ * domain. The PSS sequence is transformed using fft_size samples. 
  */
-int pss_synch_init(pss_synch_t *q, int frame_size) {
+int pss_synch_init_fft(pss_synch_t *q, uint32_t frame_size, uint32_t fft_size) {
-  int ret = -1;
+  int ret = LIBLTE_ERROR_INVALID_INPUTS;
-  int N_id_2; 
+    
+  if (q != NULL) {
+  
+    uint32_t N_id_2; 
+    uint32_t buffer_size; 
     bzero(q, sizeof(pss_synch_t));
     
-  q->conv_abs = vec_malloc((PSS_LEN_FREQ + frame_size) * sizeof(float));
+    q->N_id_2 = 10;
+    q->fft_size = fft_size;
+    q->frame_size = frame_size;
+    
+    buffer_size = fft_size + frame_size + 1;
+    
+    q->conv_abs = vec_malloc(buffer_size * sizeof(float));
     if (!q->conv_abs) {
       fprintf(stderr, "Error allocating memory\n");
       goto clean_and_exit;
     }
-  q->tmp_input = vec_malloc((PSS_LEN_FREQ + frame_size) * sizeof(cf_t));
+    q->tmp_input = vec_malloc(buffer_size * sizeof(cf_t));
     if (!q->tmp_input) {
       fprintf(stderr, "Error allocating memory\n");
       goto clean_and_exit;
     }
-  q->conv_output = vec_malloc((PSS_LEN_FREQ + frame_size) * sizeof(cf_t));
+    q->conv_output = vec_malloc(buffer_size * sizeof(cf_t));
     if (!q->conv_output) {
       fprintf(stderr, "Error allocating memory\n");
       goto clean_and_exit;
     }
     for (N_id_2=0;N_id_2<3;N_id_2++) {
-    q->pss_signal_freq[N_id_2] = vec_malloc((PSS_LEN_FREQ + frame_size) * sizeof(cf_t));
+      q->pss_signal_freq[N_id_2] = vec_malloc(buffer_size * sizeof(cf_t));
       if (!q->pss_signal_freq[N_id_2]) {
         fprintf(stderr, "Error allocating memory\n");
         goto clean_and_exit;
       }
-    if (pss_synch_init_N_id_2(q, N_id_2)) {
+      /* The PSS is translated into the frequency domain for each N_id_2  */
-      fprintf(stderr, "Error initiating PSS detector for N_id_2=%d\n", N_id_2);
+      if (pss_synch_init_N_id_2(q->pss_signal_freq[N_id_2], N_id_2, fft_size)) {
+        fprintf(stderr, "Error initiating PSS detector for N_id_2=%d fft_size=%d\n", N_id_2, fft_size);
         goto clean_and_exit;
       }      
     }    
-
-#ifdef ENABLE_SF
-  q->frame_buffer = vec_malloc(4 * frame_size * sizeof(cf_t));
-  if (!q->frame_buffer) {
-    fprintf(stderr, "Error allocating memory\n");
-    goto clean_and_exit;
-  }
-  q->correlation_threshold = DEFAULT_CORRELATION_TH;
-  q->nosync_timeout_frames = DEFAULT_NOSYNC_TIMEOUT;
-  q->cfo_auto = true;
-  q->frame_start_idx = NOT_SYNC;
-  q->fb_wp = 0;
-#endif
-
     #ifdef CONVOLUTION_FFT
-  if (conv_fft_cc_init(&q->conv_fft, frame_size, PSS_LEN_FREQ)) {
+    if (conv_fft_cc_init(&q->conv_fft, frame_size, fft_size)) {
       fprintf(stderr, "Error initiating convolution FFT\n");
       goto clean_and_exit;
     }
     #endif
     
-  q->N_id_2 = -1;
+    ret = LIBLTE_SUCCESS;
-  q->frame_size = frame_size;
+  }
 
-  ret = 0;
+clean_and_exit: 
-  clean_and_exit: if (ret == -1) {
+  if (ret == LIBLTE_ERROR) {
     pss_synch_free(q);
   }
   return ret;
 }
 
 void pss_synch_free(pss_synch_t *q) {
-  int i;
+  uint32_t i;
+
+  if (q) {
     for (i=0;i<3;i++) {
       if (q->pss_signal_freq[i]) {
         free(q->pss_signal_freq[i]);
       }
     }
-  if (q->conv_abs) {
+  #ifdef CONVOLUTION_FFT
-    free(q->conv_abs);
+    conv_fft_cc_free(&q->conv_fft);
-  }
+    
+  #endif
     if (q->tmp_input) {
       free(q->tmp_input);
     }
     if (q->conv_output) {
       free(q->conv_output);
     }
-
+    if (q->conv_abs) {
-#ifdef ENABLE_SF
+      free(q->conv_abs);
-  if (q->frame_buffer) {
-    free(q->frame_buffer);
     }
-#endif
-
-#ifdef CONVOLUTION_FFT
-  conv_fft_cc_free(&q->conv_fft);
-#endif
 
     bzero(q, sizeof(pss_synch_t));    
   }
+}
 
 /**
  * This function calculates the Zadoff-Chu sequence.
  * @param signal Output array.
  */
-int pss_generate(cf_t *signal, int N_id_2) {
+int pss_generate(cf_t *signal, uint32_t N_id_2) {
   int i;
   float arg;
   const float root_value[] = { 25.0, 29.0, 34.0 };
@@ -182,7 +180,7 @@ int pss_generate(cf_t *signal, int N_id_2) {
 
   int sign = -1;
 
-  if (N_id_2 < 0 || N_id_2 > 2) {
+  if (N_id_2 > 2) {
     fprintf(stderr, "Invalid N_id_2 %d\n", N_id_2);
     return -1;
   }
@@ -206,7 +204,7 @@ int pss_generate(cf_t *signal, int N_id_2) {
 
 /** 36.211 10.3 section 6.11.1.2
  */
-void pss_put_slot(cf_t *pss_signal, cf_t *slot, int nof_prb, lte_cp_t cp) {
+void pss_put_slot(cf_t *pss_signal, cf_t *slot, uint32_t nof_prb, lte_cp_t cp) {
   int k;
   k = (CP_NSYMB(cp) - 1) * nof_prb * RE_X_RB + nof_prb * RE_X_RB / 2 - 31;
   memset(&slot[k - 5], 0, 5 * sizeof(cf_t));
@@ -217,8 +215,8 @@ void pss_put_slot(cf_t *pss_signal, cf_t *slot, int nof_prb, lte_cp_t cp) {
 
 /** Sets the current N_id_2 value. Returns -1 on error, 0 otherwise
  */
-int pss_synch_set_N_id_2(pss_synch_t *q, int N_id_2) {
+int pss_synch_set_N_id_2(pss_synch_t *q, uint32_t N_id_2) {
-    if (N_id_2 < 0 || N_id_2 > 2) {
+  if (!lte_N_id_2_isvalid((N_id_2))) {
     fprintf(stderr, "Invalid N_id_2 %d\n", N_id_2);
     return -1;
   } else {
@@ -227,27 +225,38 @@ int pss_synch_set_N_id_2(pss_synch_t *q, int N_id_2) {
   }
 }
 
-
 /** Returns the index of the PSS correlation peak in a subframe.
  * The frame starts at corr_peak_pos-subframe_size/2.
  * The value of the correlation is stored in corr_peak_value.
  *
  * Input buffer must be subframe_size long.
  */
-int pss_synch_find_pss(pss_synch_t *q, cf_t *input, float *corr_peak_value,
+int pss_synch_find_pss(pss_synch_t *q, cf_t *input, 
-    float *corr_mean_value) {
+                       float *corr_peak_value, float *corr_mean_value) 
-  int corr_peak_pos;
+{
-  int conv_output_len;
+  int ret = LIBLTE_ERROR_INVALID_INPUTS;
+  
+  if (q                 != NULL  && 
+      input             != NULL)
+  {
+
+    uint32_t corr_peak_pos;
+    uint32_t conv_output_len;
+    
+    if (!lte_N_id_2_isvalid(q->N_id_2)) {
+      fprintf(stderr, "Error finding PSS peak, N_id_2 not set\n");
+      return LIBLTE_ERROR;
+    }
     
-  memset(&q->pss_signal_freq[q->N_id_2][PSS_LEN_FREQ], 0, q->frame_size * sizeof(cf_t));
+    bzero(&q->pss_signal_freq[q->N_id_2][q->fft_size], q->frame_size * sizeof(cf_t));
     memcpy(q->tmp_input, input, q->frame_size * sizeof(cf_t));
-  memset(&q->tmp_input[q->frame_size], 0, PSS_LEN_FREQ * sizeof(cf_t));
+    bzero(&q->tmp_input[q->frame_size], q->fft_size * sizeof(cf_t));
 
   #ifdef CONVOLUTION_FFT
     conv_output_len = conv_fft_cc_run(&q->conv_fft, q->tmp_input,
         q->pss_signal_freq[q->N_id_2], q->conv_output);
   #else
-  conv_output_len = conv_cc(input, q->pss_signal_freq[q->N_id_2], q->conv_output, q->frame_size, PSS_LEN_FREQ);
+    conv_output_len = conv_cc(input, q->pss_signal_freq[q->N_id_2], q->conv_output, q->frame_size, q->fft_size);
   #endif
 
     vec_abs_cf(q->conv_output, q->conv_abs, conv_output_len);
@@ -260,7 +269,9 @@ int pss_synch_find_pss(pss_synch_t *q, cf_t *input, float *corr_peak_value,
           / conv_output_len;
     }
 
-  return (int) corr_peak_pos;
+    ret = (int) corr_peak_pos;          
+  } 
+  return ret;
 }
 
 /* Returns the CFO estimation given a PSS received sequence
@@ -270,159 +281,12 @@ int pss_synch_find_pss(pss_synch_t *q, cf_t *input, float *corr_peak_value,
  */
 float pss_synch_cfo_compute(pss_synch_t* q, cf_t *pss_recv) {
   cf_t y0, y1, yr;
-  cf_t y[PSS_LEN_FREQ - 1];
 
-  vec_prod_ccc_unalign(q->pss_signal_freq[q->N_id_2], pss_recv, y, PSS_LEN_FREQ - 1);
+  y0 = vec_dot_prod_ccc(q->pss_signal_freq[q->N_id_2], pss_recv, q->fft_size/2);
+  y1 = vec_dot_prod_ccc(&q->pss_signal_freq[q->N_id_2][q->fft_size/2], &pss_recv[q->fft_size/2], q->fft_size/2);
   
-  y0 = vec_acc_cc(y, (PSS_LEN_FREQ - 1) / 2);
-  y1 = vec_acc_cc(&y[(PSS_LEN_FREQ - 1) / 2], (PSS_LEN_FREQ - 1) / 2);
   yr = conjf(y0) * y1;
 
   return atan2f(__imag__ yr, __real__ yr) / M_PI;
 }
 
-#ifdef ENABLE_SF
-
-void pss_synch_set_timeout(pss_synch_t *q, int nof_frames) {
-  q->nosync_timeout_frames = nof_frames;
-}
-
-void pss_synch_set_threshold(pss_synch_t *q, float threshold) {
-  q->correlation_threshold = threshold;
-}
-
-void pss_synch_set_cfo_mode(pss_synch_t *q, bool cfo_auto) {
-  q->cfo_auto = cfo_auto;
-}
-
-float pss_synch_get_cfo(pss_synch_t *q) {
-  return q->current_cfo;
-}
-
-int pss_synch_get_frame_start_idx(pss_synch_t *q) {
-  return q->frame_start_idx;
-}
-
-/** This function is designed to be called periodically on a subframe basis.
- * The function finds the PSS correlation peak and computes (does not adjust) CFO automatically as defined by
- * pss_synch_set_cfo_mode().
- *
- * If the PSS sequence is not found, returns 0 writes nothing to the output buffer.
- * If the PSS sequence is found, aligns the beginning of the subframe to the output buffer and returns the number of samples
- * written to the output buffer.
- * If synchronized, subsequent calls to this function align the input buffer to the subframe beginning.
- */
-int pss_synch_frame(pss_synch_t *q, cf_t *input, cf_t *output, int nsamples) {
-  int max_idx, tmp_start_idx;
-  int retval;
-  float max_value;
-
-  if (nsamples != q->frame_size) {
-    fprintf(stderr, "Configured for frame size %d but got %d samples\n",
-        q->frame_size, nsamples);
-    return -1;
-  }
-
-  if (q->N_id_2 < 0) {
-    fprintf(stderr,
-        "N_id_2 must be configured before calling pss_synch()\n");
-    return -1;
-  }
-
-  max_idx = pss_synch_find_pss(q, input, &max_value, NULL);
-  if (max_value > q->correlation_threshold) {
-    tmp_start_idx = max_idx - nsamples / 2;
-    if (q->frame_start_idx != tmp_start_idx) {
-      printf("Re-synchronizing: new index is %d, old was %d\n",
-          tmp_start_idx, q->frame_start_idx);
-    }
-    q->frame_start_idx = tmp_start_idx;
-  } else {
-    if (q->nosync_timeout_frames > 0) {
-      q->nof_nosync_frames++;
-      if (q->nof_nosync_frames >= q->nosync_timeout_frames) {
-        q->frame_start_idx = NOT_SYNC;
-      }
-    }
-  }
-
-  if (q->frame_start_idx == NOT_SYNC) {
-
-    memcpy(q->frame_buffer, input, nsamples * sizeof(cf_t));
-    retval = 0;
-
-  } else if (q->frame_start_idx > 0) {
-
-    if (q->fb_wp) {
-      memcpy(&q->frame_buffer[(nsamples - q->frame_start_idx)], input,
-          q->frame_start_idx * sizeof(cf_t));
-      memcpy(output, q->frame_buffer, nsamples * sizeof(cf_t));
-      retval = nsamples;
-    } else {
-      retval = 0;
-    }
-    memcpy(q->frame_buffer, &input[q->frame_start_idx],
-        (nsamples - q->frame_start_idx) * sizeof(cf_t));
-    q->fb_wp = 1;
-
-  } else {
-
-    memcpy(output, &q->frame_buffer[nsamples + q->frame_start_idx],
-        (-q->frame_start_idx) * sizeof(cf_t));
-    memcpy(&output[-q->frame_start_idx], input,
-        (nsamples + q->frame_start_idx) * sizeof(cf_t));
-    memcpy(&q->frame_buffer[nsamples + q->frame_start_idx],
-        &input[nsamples + q->frame_start_idx],
-        (-q->frame_start_idx) * sizeof(cf_t));
-    retval = nsamples;
-  }
-
-  if (q->frame_start_idx != NOT_SYNC && q->cfo_auto && retval) {
-    q->current_cfo = pss_synch_cfo_compute(q,
-        &output[q->frame_size / 2 - PSS_LEN_FREQ + 1]);
-  }
-
-  return retval;
-}
-
-/** High-level API */
-
-int pss_synch_initialize(pss_synch_hl* h) {
-  int fs = h->init.frame_size;
-  if (!fs) {
-    fs = DEFAULT_FRAME_SIZE;
-  }
-  if (pss_synch_init(&h->obj, fs)) {
-    return -1;
-  }
-  if (h->init.unsync_nof_pkts) {
-    pss_synch_set_timeout(&h->obj, h->init.unsync_nof_pkts);
-  }
-
-  pss_synch_set_N_id_2(&h->obj, h->init.N_id_2);
-  if (h->init.do_cfo) {
-    pss_synch_set_cfo_mode(&h->obj, true);
-  } else {
-    pss_synch_set_cfo_mode(&h->obj, false);
-  }
-  return 0;
-}
-
-int pss_synch_work(pss_synch_hl* hl) {
-
-  if (hl->ctrl_in.correlation_threshold) {
-    pss_synch_set_threshold(&hl->obj, hl->ctrl_in.correlation_threshold);
-  }
-
-  hl->out_len = pss_synch_frame(&hl->obj, hl->input, hl->output, hl->in_len);
-
-  return 0;
-}
-
-int pss_synch_stop(pss_synch_hl* hl) {
-  pss_synch_free(&hl->obj);
-  return 0;
-}
-
-#endif
-

lte/phy/lib/sync/src/sss.c

@@ -35,29 +35,58 @@
 #include "liblte/phy/sync/sss.h"
 #include "liblte/phy/utils/dft.h"
 #include "liblte/phy/utils/convolution.h"
+#include "liblte/phy/utils/vector.h"
 
-void generate_sss_all_tables(struct sss_tables *tables, int N_id_2);
+void generate_sss_all_tables(struct sss_tables *tables, uint32_t N_id_2);
 void convert_tables(struct fc_tables *fc_tables, struct sss_tables *in);
-void generate_N_id_1_table(int table[30][30]);
+void generate_N_id_1_table(uint32_t table[30][30]);
 
-int sss_synch_init(sss_synch_t *q) {
+int sss_synch_init(sss_synch_t *q, uint32_t fft_size) {
-  int N_id_2;
+  
+  if (q                 != NULL  &&
+      fft_size          < 2048)
+  {
+    uint32_t N_id_2;
     struct sss_tables sss_tables;
 
     bzero(q, sizeof(sss_synch_t));
     
-  if (dft_plan(&q->dftp_input, SSS_DFT_LEN, FORWARD, COMPLEX)) {
+    if (dft_plan(&q->dftp_input, fft_size, FORWARD, COMPLEX)) {
-    return -1;
+      sss_synch_free(q);
+      return LIBLTE_ERROR;
     }
+    q->fft_size = fft_size; 
+    
     generate_N_id_1_table(q->N_id_1_table);
     dft_plan_set_mirror(&q->dftp_input, true);
     dft_plan_set_dc(&q->dftp_input, true);
+    
     for (N_id_2=0;N_id_2<3;N_id_2++) {
       generate_sss_all_tables(&sss_tables, N_id_2);
       convert_tables(&q->fc_tables[N_id_2], &sss_tables);
     }
     q->N_id_2 = 0;
-  return 0;
+    return LIBLTE_SUCCESS;
+  } 
+  return LIBLTE_ERROR_INVALID_INPUTS;
+}
+
+int sss_synch_realloc(sss_synch_t *q, uint32_t fft_size) {
+  if (q                 != NULL  &&
+      fft_size          < 2048)
+  {
+    dft_plan_free(&q->dftp_input);
+    if (dft_plan(&q->dftp_input, fft_size, FORWARD, COMPLEX)) {
+      sss_synch_free(q);
+      return LIBLTE_ERROR;
+    }
+    dft_plan_set_mirror(&q->dftp_input, true);
+    dft_plan_set_dc(&q->dftp_input, true);
+    
+    q->fft_size = fft_size;
+    return LIBLTE_SUCCESS;
+  }
+  return LIBLTE_ERROR_INVALID_INPUTS;
 }
 
 void sss_synch_free(sss_synch_t *q) {
@@ -66,22 +95,24 @@ void sss_synch_free(sss_synch_t *q) {
 }
 
 /** Sets the N_id_2 to search for */
-int sss_synch_set_N_id_2(sss_synch_t *q, int N_id_2) {
+int sss_synch_set_N_id_2(sss_synch_t *q, uint32_t N_id_2) {
-  if (N_id_2 < 0 || N_id_2 > 2) {
+  if (!lte_N_id_2_isvalid(N_id_2)) {
     fprintf(stderr, "Invalid N_id_2 %d\n", N_id_2);
-    return -1;
+    return LIBLTE_ERROR;
   } else {
     q->N_id_2 = N_id_2;
-    return 0;
+    return LIBLTE_SUCCESS;
   }
 }
 
 /** 36.211 10.3 section 6.11.2.2
  */
-void sss_put_slot(float *sss, cf_t *slot, int nof_prb, lte_cp_t cp) {
+void sss_put_slot(float *sss, cf_t *slot, uint32_t nof_prb, lte_cp_t cp) {
-  int i, k;
+  uint32_t i, k;
 
   k = (CP_NSYMB(cp) - 2) * nof_prb * RE_X_RB + nof_prb * RE_X_RB / 2 - 31;
+  
+  if (k > 5) {
     memset(&slot[k - 5], 0, 5 * sizeof(cf_t));
     for (i = 0; i < SSS_LEN; i++) {
       __real__ slot[k + i] = sss[i];
@@ -89,48 +120,6 @@ void sss_put_slot(float *sss, cf_t *slot, int nof_prb, lte_cp_t cp) {
     }
     memset(&slot[k + SSS_LEN], 0, 5 * sizeof(cf_t));
   }
-
-/* In this function, input points to the beginning of the subframe. Saves result in subframe_idx and N_id_1
- * Return 1 if the sequence was found, 0 if the peak is not found, -1 if the subframe_sz or symbol_sz are
- * invalid or not configured.
- * Before calling this function, the correlation threshold and symbol size duration need to be set
- * using sss_synch_set_threshold() and sss_synch_set_symbol_sz().
- */
-int sss_synch_frame(sss_synch_t *q, cf_t *input, int *subframe_idx, int *N_id_1) {
-  int m0, m1;
-  float m0_value, m1_value;
-
-  if (q->subframe_sz <= 0 || q->symbol_sz <= 0) {
-    return -1;
-  }
-
-  sss_synch_m0m1(q, &input[SSS_SYMBOL_ST(q->subframe_sz, q->symbol_sz)], &m0,
-      &m0_value, &m1, &m1_value);
-
-  if (m0_value > q->corr_peak_threshold
-      && m1_value > q->corr_peak_threshold) {
-    if (subframe_idx) {
-      *subframe_idx = sss_synch_subframe(m0, m1);
-    }
-    if (N_id_1) {
-      *N_id_1 = sss_synch_N_id_1(q, m0, m1);
-    }
-    return 1;
-  } else {
-    return 0;
-  }
-}
-
-/** Used by sss_synch_frame() to compute the beginning of the SSS symbol
- * symbol_sz MUST INCLUDE THE CYCLIC PREFIX SIZE
- */
-void sss_synch_set_symbol_sz(sss_synch_t *q, int symbol_sz) {
-  q->symbol_sz = symbol_sz;
-}
-
-/** Used by sss_synch_frame() to compute the beginning of the SSS symbol */
-void sss_synch_set_subframe_sz(sss_synch_t *q, int subframe_sz) {
-  q->subframe_sz = subframe_sz;
 }
 
 /** Sets the SSS correlation peak detection threshold */
@@ -139,7 +128,7 @@ void sss_synch_set_threshold(sss_synch_t *q, float threshold) {
 }
 
 /** Returns the subframe index based on the m0 and m1 values */
-int sss_synch_subframe(int m0, int m1) {
+uint32_t sss_synch_subframe(uint32_t m0, uint32_t m1) {
   if (m1 > m0) {
     return 0;
   } else {
@@ -148,9 +137,9 @@ int sss_synch_subframe(int m0, int m1) {
 }
 
 /** Returns the N_id_1 value based on the m0 and m1 values */
-int sss_synch_N_id_1(sss_synch_t *q, int m0, int m1) {
+int sss_synch_N_id_1(sss_synch_t *q, uint32_t m0, uint32_t m1) {
-  if (m0 < 0 || m0 > 29 || m1 < 0 || m1 > 29) {
+  if (m0==m1 || m0 > 29 || m1 > 29) {
-    return -1;
+    return LIBLTE_ERROR;
   }
   if (m1 > m0) {
     return q->N_id_1_table[m0][m1 - 1];
@@ -163,12 +152,12 @@ int sss_synch_N_id_1(sss_synch_t *q, int m0, int m1) {
 
 int sss_synch_initialize(sss_synch_hl* h) {
 
-  if (sss_synch_init(&h->obj)) {
+  if (sss_synch_init(&h->obj, 128)) {
-    return -1;
+    return LIBLTE_ERROR;
   }
   sss_synch_set_N_id_2(&h->obj, h->init.N_id_2);
 
-  return 0;
+  return LIBLTE_SUCCESS;
 }
 
 int sss_synch_work(sss_synch_hl* hl) {
@@ -176,20 +165,12 @@ int sss_synch_work(sss_synch_hl* hl) {
   if (hl->ctrl_in.correlation_threshold) {
     sss_synch_set_threshold(&hl->obj, hl->ctrl_in.correlation_threshold);
   }
-  if (hl->ctrl_in.subframe_sz) {
-    sss_synch_set_subframe_sz(&hl->obj, hl->ctrl_in.subframe_sz);
-  }
-  if (hl->ctrl_in.symbol_sz) {
-    sss_synch_set_symbol_sz(&hl->obj, hl->ctrl_in.symbol_sz);
-  }
-  sss_synch_frame(&hl->obj, hl->input, &hl->ctrl_out.subframe_idx,
-      &hl->ctrl_out.N_id_1);
  
-  return 0;
+  return LIBLTE_SUCCESS;
 }
 
 int sss_synch_stop(sss_synch_hl* hl) {
   sss_synch_free(&hl->obj);
-  return 0;
+  return LIBLTE_SUCCESS;
 }
 

lte/phy/lib/sync/src/sync.c

@@ -25,44 +25,106 @@
  *
  */
 
-
-
 #include <strings.h>
 
 #include "liblte/phy/utils/debug.h"
 #include "liblte/phy/common/phy_common.h"
 #include "liblte/phy/sync/sync.h"
+#include "liblte/phy/utils/vector.h"
+
+
+static bool fft_size_isvalid(uint32_t fft_size) {
+  if (fft_size >= FFT_SIZE_MIN && fft_size <= FFT_SIZE_MAX && (fft_size%64) == 0) {
+    return true;
+  } else {
+    return false;
+  }
+}
 
-int sync_init(sync_t *q, int frame_size) {
+int sync_init(sync_t *q, uint32_t find_frame_size, uint32_t track_frame_size, uint32_t fft_size) {
 
+  int ret = LIBLTE_ERROR_INVALID_INPUTS; 
+  
+  if (q                 != NULL         &&
+      find_frame_size   > fft_size &&
+      find_frame_size   < 307200        &&
+      fft_size_isvalid(fft_size))
+  {
     bzero(q, sizeof(sync_t));
-  q->threshold = 1.5;
     q->pss_mode = PEAK_MEAN;
     q->detect_cp = true;
     q->sss_en = true;
+    q->N_id_2 = 1000; 
+    q->N_id_1 = 1000;
+    q->fft_size = fft_size;
+    q->find_frame_size = find_frame_size;
     
-  if (pss_synch_init(&q->pss, frame_size)) {
+    if (pss_synch_init_fft(&q->pss_find, find_frame_size, fft_size)) {
       fprintf(stderr, "Error initializing PSS object\n");
-    return -1;
+      return LIBLTE_ERROR;
+    }
+    if (sss_synch_init(&q->sss, fft_size)) {
+      fprintf(stderr, "Error initializing SSS object\n");
+      return LIBLTE_ERROR;
     }
-  if (pss_synch_init(&q->pss_track, TRACK_LEN)) {
+    if (pss_synch_init_fft(&q->pss_track, track_frame_size, fft_size)) {
       fprintf(stderr, "Error initializing PSS track object\n");
-    return -1;
+      return LIBLTE_ERROR;
     }      
-  if (sss_synch_init(&q->sss)) {
+
-    fprintf(stderr, "Error initializing SSS object\n");
+    DEBUG("SYNC init with find_frame_size=%d and fft_size=%d\n", find_frame_size, fft_size);
-    return -1;
+    
+    ret = LIBLTE_SUCCESS;
+  }  
+  return ret;
 }
-  DEBUG("PSS and SSS initiated\n",0);
 
-  return 0;
+int sync_realloc(sync_t *q, uint32_t find_frame_size, uint32_t track_frame_size, 
+                 uint32_t fft_size)
+{
+  int ret = LIBLTE_ERROR_INVALID_INPUTS; 
+  
+  if (q                 != NULL         &&
+      find_frame_size   > fft_size &&
+      find_frame_size   < 307200        &&
+      fft_size_isvalid(fft_size))
+  {
+    q->N_id_2 = 1000; 
+    q->N_id_1 = 1000;
+    q->fft_size = fft_size;
+    q->find_frame_size = find_frame_size;
+    
+    pss_synch_free(&q->pss_find);
+    if (pss_synch_init_fft(&q->pss_find, find_frame_size, fft_size)) {
+      fprintf(stderr, "Error initializing PSS object\n");
+      return LIBLTE_ERROR;
+    }
+   
+    pss_synch_free(&q->pss_track);      
+    if (pss_synch_init_fft(&q->pss_track, track_frame_size, fft_size)) {
+      fprintf(stderr, "Error initializing PSS track object\n");
+      return LIBLTE_ERROR;
+    }
+    
+    if (sss_synch_realloc(&q->sss, fft_size)) {
+      fprintf(stderr, "Error realloc'ing SSS object\n");
+      return LIBLTE_ERROR;
+    }
+
+    DEBUG("SYNC init with find_frame_size=%d and fft_size=%d\n", find_frame_size, fft_size);
+    
+    ret = LIBLTE_SUCCESS;
+  }
+  return ret; 
 }
 
 void sync_free(sync_t *q) {
-  pss_synch_free(&q->pss);
+  if (q) {
     pss_synch_free(&q->pss_track);      
+    pss_synch_free(&q->pss_find);
     sss_synch_free(&q->sss);  
   }
+}
 
 void sync_pss_det_absolute(sync_t *q) {
   q->pss_mode = ABSOLUTE;
@@ -71,31 +133,42 @@ void sync_pss_det_peak_to_avg(sync_t *q) {
   q->pss_mode = PEAK_MEAN;
 }
 
-void sync_set_threshold(sync_t *q, float threshold) {
+void sync_set_threshold(sync_t *q, float find_threshold, float track_threshold) {
-  q->threshold = threshold;
+  q->find_threshold = find_threshold;
+  q->track_threshold = track_threshold;
 }
 
 void sync_sss_en(sync_t *q, bool enabled) {
   q->sss_en = enabled;
 }
 
+bool sync_sss_detected(sync_t *q) {
+  return lte_N_id_1_isvalid(q->N_id_1);
+}
+
 int sync_get_cell_id(sync_t *q) {
-  if (q->N_id_1 >=0 && q->N_id_2 >= 0) {
+  if (q->N_id_2 != 10) {
+    if (lte_N_id_2_isvalid(q->N_id_2) && lte_N_id_1_isvalid(q->N_id_1)) {
       return q->N_id_1*3 + q->N_id_2;      
     } else {
-    return -1;
+      fprintf(stderr, "Error getting cell_id, invalid N_id_1 or N_id_2\n");
+      return LIBLTE_ERROR;
+    }
+  } else {
+    fprintf(stderr, "Error getting cell_id, N_id_2 not set\n");
+    return LIBLTE_ERROR;
   }
 }
 
-int sync_get_N_id_1(sync_t *q) {
+uint32_t sync_get_N_id_1(sync_t *q) {
   return q->N_id_1;
 }
 
-int sync_get_N_id_2(sync_t *q) {
+uint32_t sync_get_N_id_2(sync_t *q) {
   return q->N_id_2;
 }
 
-int sync_get_slot_id(sync_t *q) {
+uint32_t sync_get_slot_id(sync_t *q) {
   return q->slot_id;
 }
 
@@ -115,57 +188,66 @@ lte_cp_t sync_get_cp(sync_t *q) {
   return q->cp;
 }
 
-int sync_sss(sync_t *q, cf_t *input, int N_id_2, int peak_pos, bool en_cp) {
+int sync_sss(sync_t *q, cf_t *input, uint32_t peak_pos, bool en_cp) {
-  int m0, m1, sss_idx_n, sss_idx_e;
+  uint32_t m0, m1;
+  int sss_idx_n, sss_idx_e, ret;
   float m0_value_e, m1_value_e,m0_value_n, m1_value_n;
-  int slot_id_e, N_id_1_e, slot_id_n, N_id_1_n;
+  uint32_t slot_id_e, N_id_1_e, slot_id_n, N_id_1_n;
 
-  sss_synch_set_N_id_2(&q->sss, N_id_2);
+  sss_synch_set_N_id_2(&q->sss, q->N_id_2);
       
   /* Make sure we have enough room to find SSS sequence */
-  sss_idx_n = peak_pos-2*(128+CP(128,CPNORM_LEN));
+  sss_idx_n = (int) peak_pos - 2*(q->fft_size + CP(q->fft_size, CPNORM_LEN));
-  sss_idx_e = peak_pos-2*(128+CP(128,CPEXT_LEN));
+  sss_idx_e = (int) peak_pos - 2*(q->fft_size + CP(q->fft_size, CPEXT_LEN));
 
   if (en_cp) {
     if (sss_idx_n < 0 || sss_idx_e < 0) {
       INFO("Not enough room to decode SSS (%d, %d)\n", sss_idx_n, sss_idx_e);
-      return -1;
+      return LIBLTE_SUCCESS;
     }
   } else {
     if (CP_ISNORM(q->cp)) {
       if (sss_idx_n < 0) {
-        INFO("Not enough room to decode SSS (%d)\n", sss_idx_n);
+        INFO("Not enough room to decode normal CP SSS (sss_idx=%d, peak_pos=%d)\n", sss_idx_n, peak_pos);
-        return -1;
+        return LIBLTE_SUCCESS;
       }
     } else {
       if (sss_idx_e < 0) {
-        INFO("Not enough room to decode SSS (%d)\n", sss_idx_e);
+        INFO("Not enough room to decode extended CP SSS (sss_idx=%d, peak_pos=%d)\n", sss_idx_e, peak_pos);
-        return -1;
+        return LIBLTE_SUCCESS;
       }
     }
   }
       
-  N_id_1_e = -1;
+  slot_id_n = 0;
-  N_id_1_n = -1;
+  slot_id_e = 0;
-  slot_id_e = -1;
+  N_id_1_n = 0;
-  slot_id_n = -1;
+  N_id_1_e = 0;
   
   /* try Normal CP length */
   if (en_cp || CP_ISNORM(q->cp)) {
-    sss_synch_m0m1(&q->sss, &input[sss_idx_n],
+    sss_synch_m0m1(&q->sss, &input[sss_idx_n], &m0, &m0_value_n, &m1, &m1_value_n);
-        &m0, &m0_value_n, &m1, &m1_value_n);
 
     slot_id_n = 2 * sss_synch_subframe(m0, m1);
-    N_id_1_n = sss_synch_N_id_1(&q->sss, m0, m1);
+    ret = sss_synch_N_id_1(&q->sss, m0, m1);
+    if (ret >= 0) {
+      N_id_1_n = (uint32_t) ret;
+    } else {
+      N_id_1_n = 1000;
+    }
   }
 
   if (en_cp || CP_ISEXT(q->cp)) {
     /* Now try Extended CP length */
-    sss_synch_m0m1(&q->sss, &input[sss_idx_e],
+    sss_synch_m0m1(&q->sss, &input[sss_idx_e], &m0, &m0_value_e, &m1, &m1_value_e);
-        &m0, &m0_value_e, &m1, &m1_value_e);
 
     slot_id_e = 2 * sss_synch_subframe(m0, m1);
-    N_id_1_e = sss_synch_N_id_1(&q->sss, m0, m1);
+    ret = sss_synch_N_id_1(&q->sss, m0, m1);
+    if (ret >= 0) {
+      N_id_1_e = (uint32_t) ret;
+    } else {
+      N_id_1_e = 1000;
+    }
   }
   
   /* Correlation with extended CP hypoteshis is greater than with normal? */
@@ -174,56 +256,93 @@ int sync_sss(sync_t *q, cf_t *input, int N_id_2, int peak_pos, bool en_cp) {
     q->cp = CPEXT;
     q->slot_id = slot_id_e;
     q->N_id_1 = N_id_1_e;
-  /* then is normal CP */
+  /* otherwise is normal CP */
   } else {
     q->cp = CPNORM;
     q->slot_id = slot_id_n;
     q->N_id_1 = N_id_1_n;
   }
   
-  INFO("SSS detected N_id_1=%d, slot_idx=%d, %s CP\n",
+  DEBUG("SSS detected N_id_1=%d, slot_idx=%d, position=%d/%d %s CP\n",
-    q->N_id_1, q->slot_id, CP_ISNORM(q->cp)?"Normal":"Extended");
+    q->N_id_1, q->slot_id, sss_idx_n, sss_idx_e, CP_ISNORM(q->cp)?"Normal":"Extended");
 
-  return 0;
+  return 1;
 }
 
-int sync_track(sync_t *q, cf_t *input) {
+int sync_track(sync_t *q, cf_t *input, uint32_t offset, uint32_t *peak_position) {
-  float peak_value, mean_value;
+  
-  int peak_detected = 0;
+  int ret = LIBLTE_ERROR_INVALID_INPUTS; 
+  
+  if (q                 != NULL   &&
+      input             != NULL   && 
+      fft_size_isvalid(q->fft_size))
+  {
+    float peak_value, mean_value, *mean_ptr;
+    bool peak_detected;
+    uint32_t peak_pos;
+
     pss_synch_set_N_id_2(&q->pss_track, q->N_id_2);
     
-  int peak_pos = pss_synch_find_pss(&q->pss, input, &peak_value, &mean_value);
+    if (q->pss_mode == ABSOLUTE) {
+      mean_ptr = NULL;
+    } else {
+      mean_ptr = &mean_value;
+    }
+    
+    peak_pos = pss_synch_find_pss(&q->pss_track, &input[offset], &peak_value, mean_ptr);
 
-  if (q->peak_to_avg > TRACK_THRESHOLD) {
+    peak_detected = false;
-    peak_detected = 1;    
+    if (q->pss_mode == ABSOLUTE) {
+      if (peak_value > q->track_threshold) {
+        peak_detected = true;
       }
+    } else {
+      q->peak_to_avg = peak_value / mean_value;
+      if (q->peak_to_avg  > q->track_threshold) {
+        peak_detected = true;
+      }
+    }
+    DEBUG("PSS possible tracking peak pos=%d peak=%.2f par=%.2f threshold=%.2f\n",
+          peak_pos, peak_value, q->peak_to_avg, q->track_threshold);
     if (peak_detected) {
-
+      q->cfo = pss_synch_cfo_compute(&q->pss_track, &input[offset+peak_pos-q->fft_size]);
-    q->cfo = pss_synch_cfo_compute(&q->pss, &input[peak_pos-128]);
 
       if (q->sss_en) {
-      if (sync_sss(q, input, q->N_id_2, peak_pos, false)) {
+        if (sync_sss(q, input, offset + peak_pos, false) < 0) {
-        return -1;
+          fprintf(stderr, "Error synchronizing with SSS\n");
+          return LIBLTE_ERROR;
         }
       }
     
-    return peak_pos;
+      if (peak_position) {
+        *peak_position = peak_pos;
+      }
+      ret = 1;      
     } else {
-    return -1;
+      ret = LIBLTE_SUCCESS;
+    }
   }
+  return ret; 
 }
 
-int sync_find(sync_t *q, cf_t *input) {
+int sync_find(sync_t *q, cf_t *input, uint32_t *peak_position) {
-  int N_id_2, peak_pos[3];
+  uint32_t N_id_2, peak_pos[3];
   float peak_value[3];
   float mean_value[3];
   float max=-999;
-  int i;
+  uint32_t i;
-  int peak_detected;
+  int ret; 
+  bool peak_detected;
 
   for (N_id_2=0;N_id_2<3;N_id_2++) {
-    pss_synch_set_N_id_2(&q->pss, N_id_2);
+    pss_synch_set_N_id_2(&q->pss_find, N_id_2);
-    peak_pos[N_id_2] = pss_synch_find_pss(&q->pss, input, &peak_value[N_id_2], &mean_value[N_id_2]);
+    ret = pss_synch_find_pss(&q->pss_find, input, &peak_value[N_id_2], &mean_value[N_id_2]);
+    if (ret < 0) {
+      fprintf(stderr, "Error finding PSS for N_id_2=%d\n", N_id_2);
+      return LIBLTE_ERROR;
+    } 
+    peak_pos[N_id_2] = (uint32_t) ret;
+    
   }
   for (i=0;i<3;i++) {
     if (peak_value[i] > max) {
@@ -235,38 +354,43 @@ int sync_find(sync_t *q, cf_t *input) {
   q->peak_to_avg = peak_value[N_id_2] / mean_value[N_id_2];
 
   DEBUG("PSS possible peak N_id_2=%d, pos=%d peak=%.2f par=%.2f threshold=%.2f\n",
-      N_id_2, peak_pos[N_id_2], peak_value[N_id_2], q->peak_to_avg, q->threshold);
+      N_id_2, peak_pos[N_id_2], peak_value[N_id_2], q->peak_to_avg, q->find_threshold);
 
   /* If peak detected */
-  peak_detected = 0;
+  peak_detected = false;
-  if (peak_pos[N_id_2] - 128 >= 0) {
+  if (peak_pos[N_id_2] > q->fft_size) {
     if (q->pss_mode == ABSOLUTE) {
-      if (peak_value[N_id_2] > q->threshold) {
+      if (peak_value[N_id_2] > q->find_threshold) {
-        peak_detected = 1;
+        peak_detected = true;
       }
     } else {
-      if (q->peak_to_avg  > q->threshold) {
+      if (q->peak_to_avg  > q->find_threshold) {
-        peak_detected = 1;
+        peak_detected = true;
       }
     }
   }
+  
   if (peak_detected) {
     q->N_id_2 = N_id_2;
-    pss_synch_set_N_id_2(&q->pss, q->N_id_2);
+    pss_synch_set_N_id_2(&q->pss_find, q->N_id_2);
-    q->cfo = pss_synch_cfo_compute(&q->pss, &input[peak_pos[q->N_id_2]-128]);
+    q->cfo = pss_synch_cfo_compute(&q->pss_find, &input[peak_pos[N_id_2]-q->fft_size]);
     
-    INFO("PSS peak detected N_id_2=%d, pos=%d peak=%.2f par=%.2f th=%.2f cfo=%.4f\n", N_id_2,
+    DEBUG("PSS peak detected N_id_2=%d, pos=%d peak=%.2f par=%.2f th=%.2f cfo=%.4f\n", N_id_2,
-        peak_pos[N_id_2], peak_value[N_id_2], q->peak_to_avg, q->threshold, q->cfo);
+        peak_pos[N_id_2], peak_value[N_id_2], q->peak_to_avg, q->find_threshold, q->cfo);
 
     if (q->sss_en) {     
-      if (sync_sss(q, input, q->N_id_2, peak_pos[q->N_id_2], q->detect_cp)) {
+      if (sync_sss(q, input, peak_pos[q->N_id_2], q->detect_cp) < 0) {
-        return -1;
+        fprintf(stderr, "Error synchronizing with SSS\n");
+        return LIBLTE_ERROR;
       }
     }
     
-    return peak_pos[N_id_2];
+    if (peak_position) {
+      *peak_position = peak_pos[N_id_2];
+    }
 
+    return 1;
   } else {
-    return -1;
+    return LIBLTE_SUCCESS;
   }
 }

lte/phy/lib/sync/src/sync_frame.c

@@ -1,244 +0,0 @@
-/**
- *
- * \section COPYRIGHT
- *
- * Copyright 2013-2014 The libLTE Developers. See the
- * COPYRIGHT file at the top-level directory of this distribution.
- *
- * \section LICENSE
- *
- * This file is part of the libLTE library.
- *
- * libLTE is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as
- * published by the Free Software Foundation, either version 3 of
- * the License, or (at your option) any later version.
- *
- * libLTE is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Lesser General Public License for more details.
- *
- * A copy of the GNU Lesser General Public License can be found in
- * the LICENSE file in the top-level directory of this distribution
- * and at http://www.gnu.org/licenses/.
- *
- */
-
-#include <stdlib.h>
-#include <string.h>
-#include <strings.h>
-#include <assert.h>
-
-#include "liblte/phy/resampling/decim.h"
-#include "liblte/phy/resampling/resample_arb.h"
-#include "liblte/phy/utils/debug.h"
-#include "liblte/phy/sync/sync_frame.h"
-
-
-int sync_frame_init(sync_frame_t *q, uint32_t downsampling) {
-  int ret = -1;
-  bzero(q, sizeof(sync_frame_t));
-
-  if(sync_init(&q->s, SYNC_SF_LEN)) {
-    goto clean_exit;
-  }
-  sync_pss_det_peak_to_avg(&q->s);
-
-  if (cfo_init(&q->cfocorr, SYNC_SF_LEN * downsampling)) {
-    fprintf(stderr, "Error initiating CFO\n");
-    goto clean_exit;
-  }
-  
-  q->input_buffer = malloc(2 * SYNC_SF_LEN * downsampling * sizeof(cf_t));
-  if (!q->input_buffer) {
-    perror("malloc");
-    goto clean_exit;
-  }
-  
-  q->input_downsampled = malloc(SYNC_SF_LEN * sizeof(cf_t));
-  if (!q->input_downsampled) {
-    perror("malloc");
-    goto clean_exit;
-  }
-
-  resample_arb_init(&q->resample, (float) 1/downsampling);  
-  
-  q->downsampling = downsampling;
-  sync_frame_reset(q);
-  ret = 0;
-  
-clean_exit:
-  if (ret == -1) {
-    sync_frame_free(q);
-  }
-  return ret; 
-}
-
-void sync_frame_free(sync_frame_t *q) {
-  if (q->input_buffer) {
-    free(q->input_buffer);
-  }
-  if (q->input_downsampled) {
-    free(q->input_downsampled);
-  }
-
-  cfo_free(&q->cfocorr);
-  sync_free(&q->s);
-}
-
-void sync_frame_run(sync_frame_t *q, cf_t *input) {
-  uint32_t track_idx; 
-  
-  switch (q->state) {
-    
-  case SF_FIND:
-    q->peak_idx = sync_find(&q->s, input);
-    q->cell_id = sync_get_cell_id(&q->s);
-      
-    INFO("FIND %3d:\tPAR=%.2f\n", (int) q->frame_cnt, sync_get_peak_to_avg(&q->s));
-    
-    if (q->peak_idx != -1 && q->cell_id != -1) {
-
-      /* Get the subframe index (0 or 5) */
-      q->sf_idx = sync_get_slot_id(&q->s)/2;
-
-      /* Reset variables */ 
-      q->last_found = 0;
-      q->timeoffset = 0;
-      q->frame_cnt = 0;
-
-      /* Goto Tracking state */
-      q->state = SF_TRACK; 
-    }  
-    break;      
-  case SF_TRACK:
-
-    q->sf_idx = (q->sf_idx + 1) % 10;
-    
-    /* Every SF idx 0 and 5, find peak around known position q->peak_idx */
-    if (q->sf_idx != 0 && q->sf_idx != 5) {
-      break;
-    }
-        
-    assert(q->peak_idx < TRACK_LEN);
-    
-    track_idx = sync_track(&q->s, &input[q->peak_idx - TRACK_LEN]);
-
-    INFO("TRACK %3d: SF=%d. Previous idx is %d New Offset is %d\n", 
-         (int) q->frame_cnt, q->sf_idx, q->peak_idx, track_idx - TRACK_LEN);
-
-    if (track_idx != -1) {
-        INFO("Expected SF idx %d but got %d. Going back to FIND\n", q->sf_idx,
-             sync_get_slot_id(&q->s)/2);
-      
-      /* Make sure subframe idx is what we expect */
-      if (q->sf_idx != sync_get_slot_id(&q->s)/2) {
-        INFO("Expected SF idx %d but got %d. Going back to FIND\n", q->sf_idx,
-             sync_get_slot_id(&q->s)/2);
-        q->state = SF_FIND;
-      }
-      
-      /* compute cumulative moving average CFO */
-      q->cur_cfo = (sync_get_cfo(&q->s) + q->frame_cnt * q->cur_cfo) / (q->frame_cnt + 1);
-      
-      /* compute cumulative moving average time offset */
-      q->timeoffset = (float) ((float) track_idx - TRACK_LEN + q->timeoffset * q->frame_cnt)
-          / (q->frame_cnt + 1);
-      
-      q->last_found = q->frame_cnt;
-      q->peak_idx = (q->peak_idx + track_idx - TRACK_LEN) % SYNC_SF_LEN;  
-      
-      if (q->peak_idx < 0) {
-        INFO("PSS lost (peak_idx=%d). Going back to FIND\n", q->peak_idx);
-        q->state = SF_FIND;        
-      }
-    } else {
-      /* if sync not found, adjust time offset with the averaged value */
-      q->peak_idx = (q->peak_idx + (uint32_t) q->timeoffset) % SYNC_SF_LEN;
-
-      /* if we missed too many PSS go back to FIND */
-      if (q->frame_cnt - q->last_found > TRACK_MAX_LOST) {
-        INFO("%d frames lost. Going back to FIND", (int) q->frame_cnt - q->last_found);
-        q->state = SF_FIND;
-      }
-    }
-    q->frame_cnt++;
-    break;
-  }
-}
-
-void sync_frame_set_threshold(sync_frame_t *q, float threshold) {
-  sync_set_threshold(&q->s, threshold);
-}
-
-uint32_t sync_frame_cell_id(sync_frame_t *q) {
-  return q->cell_id;
-}
-
-uint32_t sync_frame_sfidx(sync_frame_t *q) {
-  return q->sf_idx;
-}
-
-
-int sync_frame_push(sync_frame_t *q, cf_t *input, cf_t *output) {
-  int retval = 0; 
-  int frame_start;
-  cf_t *input_ds;
-  uint32_t sf_len; 
-  
-  if (q->downsampling == 1) {
-    input_ds = input;
-  } else {
-    //resample_arb_compute(&q->resample, input, q->input_downsampled, SYNC_SF_LEN * q->downsampling);
-    decim_c(input, q->input_downsampled, q->downsampling, SYNC_SF_LEN * q->downsampling);
-    input_ds = q->input_downsampled;
-  }
-  
-  sync_frame_run(q, input_ds);
-  
-  sf_len = q->downsampling * SYNC_SF_LEN;
-  
-  if (q->state == SF_FIND) {
-    memcpy(q->input_buffer, input, sf_len * sizeof(cf_t));
-  } else {
-    frame_start = q->downsampling * q->peak_idx - sf_len/2;
-    
-    DEBUG("Peak_idx=%d, frame_start=%d cfo=%.3f\n",q->peak_idx, 
-        frame_start, q->cur_cfo);
-    
-    if (frame_start > 0) {
-      if (q->fb_wp) {
-        memcpy(&q->input_buffer[(sf_len - frame_start)], input, frame_start * sizeof(cf_t));
-        memcpy(output, q->input_buffer, sf_len * sizeof(cf_t));
-        retval = 1;
-      } 
-      memcpy(q->input_buffer, &input[frame_start], (sf_len - frame_start) * sizeof(cf_t));
-      q->fb_wp = true;
-    } else {
-      memcpy(output, &q->input_buffer[sf_len + frame_start], (-frame_start) * sizeof(cf_t));
-      memcpy(&output[-frame_start], input, (sf_len + frame_start) * sizeof(cf_t));
-      memcpy(&q->input_buffer[sf_len + frame_start], &input[sf_len + frame_start], (-frame_start) * sizeof(cf_t));
-      retval = 1;
-    }
-  }
-
-  /* Frequency Synchronization */
-  if (retval) {
-    cfo_correct(&q->cfocorr, output, -q->cur_cfo / 128);   
-  }
-  
-  if (!retval) {
-    DEBUG("Frame Buffered\n",0);
-  }
-  
-  return retval; 
-}
-
-void sync_frame_reset(sync_frame_t *q) {
-  q->state = SF_FIND;
-  q->frame_cnt = 0;
-  q->fb_wp = false; 
-  q->cur_cfo = 0;
-}
-

lte/phy/lib/sync/test/CMakeLists.txt

@@ -19,6 +19,7 @@
 # and at http://www.gnu.org/licenses/.
 #
 
+
 ########################################################################
 # SYNC TEST  
 ########################################################################

lte/phy/lib/sync/test/cfo_test.c

@@ -96,8 +96,8 @@ int main(int argc, char **argv) {
     return -1;
   }
 
-  cfo_correct(&cfocorr, output, freq);
+  cfo_correct(&cfocorr, output, output, freq);
-  cfo_correct(&cfocorr, output, -freq);
+  cfo_correct(&cfocorr, output, output, -freq);
 
   mse = 0;
   for (i=0;i<num_samples;i++) {

lte/phy/lib/sync/test/sync_test.c

@@ -78,7 +78,8 @@ int main(int argc, char **argv) {
   cf_t pss_signal[PSS_LEN];
   float sss_signal0[SSS_LEN]; // for subframe 0
   float sss_signal5[SSS_LEN]; // for subframe 5
-  int cid, max_cid, find_idx;
+  int cid, max_cid; 
+  uint32_t find_idx;
   sync_t sync;
   lte_fft_t ifft;
 
@@ -101,12 +102,12 @@ int main(int argc, char **argv) {
     exit(-1);
   }
 
-  if (sync_init(&sync, FLEN)) {
+  if (sync_init(&sync, FLEN, 128, 128)) {
     fprintf(stderr, "Error initiating PSS/SSS\n");
     return -1;
   }
 
-  sync_set_threshold(&sync, 20);
+  sync_set_threshold(&sync, 20, 10);
 
   if (cell_id == -1) {
     cid = 0;
@@ -131,7 +132,7 @@ int main(int argc, char **argv) {
       memset(fft_buffer, 0, sizeof(cf_t) * 2 * FLEN);
       lte_ifft_run_slot(&ifft, buffer, &fft_buffer[offset]);
 
-      find_idx = sync_find(&sync, fft_buffer);
+      sync_find(&sync, fft_buffer, &find_idx);
       find_ns = sync_get_slot_id(&sync);
       printf("cell_id: %d find: %d, offset: %d, ns=%d find_ns=%d\n", cid, find_idx, offset,
           ns, find_ns);

lte/phy/lib/utils/src/cexptab.c

@@ -33,8 +33,8 @@
 
 #include "liblte/phy/utils/cexptab.h"
 
-int cexptab_init(cexptab_t *h, int size) {
+int cexptab_init(cexptab_t *h, uint32_t size) {
-  int i;
+  uint32_t i;
 
   h->size = size;
   h->tab = malloc(sizeof(cf_t) * size);
@@ -42,9 +42,9 @@ int cexptab_init(cexptab_t *h, int size) {
     for (i = 0; i < size; i++) {
       h->tab[i] = cexpf(_Complex_I * 2 * M_PI * (float) i / size);
     }
-    return 0;
+    return LIBLTE_SUCCESS;
   } else {
-    return -1;
+    return LIBLTE_ERROR;
   }
 }
 
@@ -55,9 +55,9 @@ void cexptab_free(cexptab_t *h) {
   bzero(h, sizeof(cexptab_t));
 }
 
-void cexptab_gen(cexptab_t *h, cf_t *x, float freq, int len) {
+void cexptab_gen(cexptab_t *h, cf_t *x, float freq, uint32_t len) {
-  int i;
+  uint32_t i;
-  unsigned int idx;
+  uint32_t idx;
   float phase_inc = freq * h->size;
   float phase=0;
 
@@ -68,15 +68,15 @@ void cexptab_gen(cexptab_t *h, cf_t *x, float freq, int len) {
     while (phase < 0) {
       phase += (float) h->size;
     }
-    idx = (unsigned int) phase;
+    idx = (uint32_t) phase;
     x[i] = h->tab[idx];
     phase += phase_inc;
 
   }
 }
 
-void cexptab_gen_direct(cf_t *x, float freq, int len) {
+void cexptab_gen_direct(cf_t *x, float freq, uint32_t len) {
-  int i;
+  uint32_t i;
   for (i = 0; i < len; i++) {
     x[i] = cexpf(_Complex_I * 2 * M_PI * freq * i);
   }

lte/phy/lib/utils/src/convolution.c

@@ -34,61 +34,61 @@
 #include "liblte/phy/utils/convolution.h"
 
 
-int conv_fft_cc_init(conv_fft_cc_t *state, int input_len, int filter_len) {
+int conv_fft_cc_init(conv_fft_cc_t *q, uint32_t input_len, uint32_t filter_len) {
-  state->input_len = input_len;
+  q->input_len = input_len;
-  state->filter_len = filter_len;
+  q->filter_len = filter_len;
-  state->output_len = input_len+filter_len-1;
+  q->output_len = input_len+filter_len;
-  state->input_fft = vec_malloc(sizeof(_Complex float)*state->output_len);
+  q->input_fft = vec_malloc(sizeof(cf_t)*q->output_len);
-  state->filter_fft = vec_malloc(sizeof(_Complex float)*state->output_len);
+  q->filter_fft = vec_malloc(sizeof(cf_t)*q->output_len);
-  state->output_fft = vec_malloc(sizeof(_Complex float)*state->output_len);
+  q->output_fft = vec_malloc(sizeof(cf_t)*q->output_len);
-  if (!state->input_fft || !state->filter_fft || !state->output_fft) {
+  if (!q->input_fft || !q->filter_fft || !q->output_fft) {
-    return -1;
+    return LIBLTE_ERROR;
   }
-  if (dft_plan(&state->input_plan,state->output_len,FORWARD,COMPLEX)) {
+  if (dft_plan(&q->input_plan,q->output_len,FORWARD,COMPLEX)) {
-    return -2;
+    return LIBLTE_ERROR;
   }
-  if (dft_plan(&state->filter_plan,state->output_len,FORWARD,COMPLEX)) {
+  if (dft_plan(&q->filter_plan,q->output_len,FORWARD,COMPLEX)) {
-    return -3;
+    return LIBLTE_ERROR;
   }
-  if (dft_plan(&state->output_plan,state->output_len,BACKWARD,COMPLEX)) {
+  if (dft_plan(&q->output_plan,q->output_len,BACKWARD,COMPLEX)) {
-    return -4;
+    return LIBLTE_ERROR;
   }
-  return 0;
+  return LIBLTE_SUCCESS;
 }
 
-void conv_fft_cc_free(conv_fft_cc_t *state) {
+void conv_fft_cc_free(conv_fft_cc_t *q) {
-  if (state->input_fft) {
+  if (q->input_fft) {
-    free(state->input_fft);
+    free(q->input_fft);
   }
-  if (state->filter_fft) {
+  if (q->filter_fft) {
-    free(state->filter_fft);
+    free(q->filter_fft);
   }
-  if (state->output_fft) {
+  if (q->output_fft) {
-    free(state->output_fft);
+    free(q->output_fft);
   }
-  dft_plan_free(&state->input_plan);
+  dft_plan_free(&q->input_plan);
-  dft_plan_free(&state->filter_plan);
+  dft_plan_free(&q->filter_plan);
-  dft_plan_free(&state->output_plan);
+  dft_plan_free(&q->output_plan);
 }
 
-int conv_fft_cc_run(conv_fft_cc_t *state, _Complex float *input, _Complex float *filter, _Complex float *output) {
+uint32_t conv_fft_cc_run(conv_fft_cc_t *q, cf_t *input, cf_t *filter, cf_t *output) {
 
-  dft_run_c(&state->input_plan, input, state->input_fft);
+  dft_run_c(&q->input_plan, input, q->input_fft);
-  dft_run_c(&state->filter_plan, filter, state->filter_fft);
+  dft_run_c(&q->filter_plan, filter, q->filter_fft);
 
-  vec_prod_ccc(state->input_fft,state->filter_fft,state->output_fft,state->output_len);
+  vec_prod_ccc(q->input_fft,q->filter_fft,q->output_fft,q->output_len);
 
-  dft_run_c(&state->output_plan, state->output_fft, output);
+  dft_run_c(&q->output_plan, q->output_fft, output);
 
-  return state->output_len;
+  return q->output_len;
 
 }
 
-int conv_cc(_Complex float *input, _Complex float *filter, _Complex float *output, int input_len, int filter_len) {
+uint32_t conv_cc(cf_t *input, cf_t *filter, cf_t *output, uint32_t input_len, uint32_t filter_len) {
-  int i,j;
+  uint32_t i,j;
-  int output_len;
+  uint32_t output_len;
   output_len=input_len+filter_len-1;
-  memset(output,0,output_len*sizeof(_Complex float));
+  memset(output,0,output_len*sizeof(cf_t));
   for (i=0;i<input_len;i++) {
     for (j=0;j<filter_len;j++) {
       output[i+j]+=input[i]*filter[j];

lte/phy/lib/utils/src/vector.c

@@ -26,16 +26,19 @@
  */
 
 
-#include "liblte/phy/utils/vector.h"
 #include <float.h>
 #include <complex.h>
 #include <stdlib.h>
+#include <string.h>
+
+#include "liblte/phy/utils/vector.h"
+#include "liblte/phy/utils/bit.h"
 
 #ifdef HAVE_VOLK
 #include "volk/volk.h"
 #endif
 
-int vec_acc_ii(int *x, int len) {
+int vec_acc_ii(int *x, uint32_t len) {
   int i;
   int z=0;
   for (i=0;i<len;i++) {
@@ -44,10 +47,10 @@ int vec_acc_ii(int *x, int len) {
   return z;
 }
 
-float vec_acc_ff(float *x, int len) {
+float vec_acc_ff(float *x, uint32_t len) {
 #ifdef HAVE_VOLK_ACC_FUNCTION
   float result;
-  volk_32f_accumulator_s32f_u(&result,x,(unsigned int) len);
+  volk_32f_accumulator_s32f(&result,x,len);
   return result;
 #else
   int i;
@@ -59,7 +62,7 @@ float vec_acc_ff(float *x, int len) {
 #endif
 }
 
-cf_t vec_acc_cc(cf_t *x, int len) {
+cf_t vec_acc_cc(cf_t *x, uint32_t len) {
   int i;
   cf_t z=0;
   for (i=0;i<len;i++) {
@@ -68,21 +71,43 @@ cf_t vec_acc_cc(cf_t *x, int len) {
   return z;
 }
 
-void vec_sum_ccc(cf_t *z, cf_t *x, cf_t *y, int len) {
+void vec_sub_fff(float *x, float *y, float *z, uint32_t len) {
+#ifndef HAVE_VOLK_SUB_FLOAT_FUNCTION
+  int i;
+  for (i=0;i<len;i++) {
+    z[i] = x[i]-y[i];
+  }
+#else
+  volk_32f_x2_subtract_32f(z,x,y,len);
+#endif 
+}
+
+void vec_sum_ccc(cf_t *x, cf_t *y, cf_t *z, uint32_t len) {
   int i;
   for (i=0;i<len;i++) {
     z[i] = x[i]+y[i];
   }
 }
 
-void vec_sum_bbb(char *z, char *x, char *y, int len) {
+void vec_sum_bbb(char *x, char *y, char *z, uint32_t len) {
   int i;
   for (i=0;i<len;i++) {
     z[i] = x[i]+y[i];
   }
 }
 
-void vec_sc_prod_cfc(cf_t *x, float h, cf_t *z, int len) {
+void vec_sc_prod_fff(float *x, float h, float *z, uint32_t len) {
+#ifndef HAVE_VOLK_MULT_FLOAT_FUNCTION
+  int i;
+  for (i=0;i<len;i++) {
+    z[i] = x[i]*h;
+  }
+#else
+  volk_32f_s32f_multiply_32f(z,x,h,len);
+#endif
+}
+
+void vec_sc_prod_cfc(cf_t *x, float h, cf_t *z, uint32_t len) {
 #ifndef HAVE_VOLK_MULT_FUNCTION
   int i;
   for (i=0;i<len;i++) {
@@ -92,29 +117,50 @@ void vec_sc_prod_cfc(cf_t *x, float h, cf_t *z, int len) {
   cf_t hh;
   __real__ hh = h;
   __imag__ hh = 0;
-  volk_32fc_s32fc_multiply_32fc_u(z,x,hh,(unsigned int) len);
+  volk_32fc_s32fc_multiply_32fc(z,x,hh,len);
 #endif
 }
 
-void vec_sc_prod_ccc(cf_t *x, cf_t h, cf_t *z, int len) {
+void vec_sc_prod_ccc(cf_t *x, cf_t h, cf_t *z, uint32_t len) {
 #ifndef HAVE_VOLK_MULT_FUNCTION
   int i;
   for (i=0;i<len;i++) {
     z[i] = x[i]*h;
   }
 #else
-  volk_32fc_s32fc_multiply_32fc_u(z,x,h,(unsigned int) len);
+  volk_32fc_s32fc_multiply_32fc(z,x,h,len);
 #endif
 }
 
+void vec_convert_fi(float *x, int16_t *z, float scale, uint32_t len) {
+#ifdef HAVE_VOLK_CONVERT_FI_FUNCTION
+  volk_32f_s32f_convert_16i(z, x, scale, len);
+#else 
+  int i;
+  for (i=0;i<len;i++) {
+    z[i] = (int16_t) (x[i]*scale);
+  }
+#endif
+}
 
+void vec_deinterleave_cf(cf_t *x, float *real, float *imag, uint32_t len) {
+ #ifdef HAVE_VOLK_DEINTERLEAVE_FUNCTION
+  volk_32fc_deinterleave_32f_x2(real, imag, x, len);
+#else 
+  int i;
+  for (i=0;i<len;i++) {
+    real[i] = __real__ x[i];
+    imag[i] = __imag__ x[i];
+  }
+#endif 
+}
 
-void *vec_malloc(int size) {
+void *vec_malloc(uint32_t size) {
 #ifndef HAVE_VOLK
   return malloc(size);
 #else
   void *ptr;
-  if (posix_memalign(&ptr,64,size)) {
+  if (posix_memalign(&ptr,volk_get_alignment(),size)) {
     return NULL;
   } else {
     return ptr;
@@ -122,18 +168,32 @@ void *vec_malloc(int size) {
 #endif
 }
 
-void vec_fprint_c(FILE *stream, cf_t *x, int len) {
+void *vec_realloc(void *ptr, uint32_t old_size, uint32_t new_size) {
+#ifndef HAVE_VOLK
+  return realloc(ptr, new_size);
+#else
+  void *new_ptr;
+  if (posix_memalign(&new_ptr,volk_get_alignment(),new_size)) {
+    return NULL;
+  } else {
+    memcpy(new_ptr, ptr, old_size);
+    free(ptr);
+    return new_ptr;
+  }
+#endif
+}
+
+
+void vec_fprint_c(FILE *stream, cf_t *x, uint32_t len) {
   int i;
   fprintf(stream, "[");
   for (i=0;i<len;i++) {
     fprintf(stream, "%+2.2f%+2.2fi, ", __real__ x[i], __imag__ x[i]);
-    //if (!((i+1)%10))
-    //  fprintf(stream, "\n");
   }
   fprintf(stream, "];\n");
 }
 
-void vec_fprint_f(FILE *stream, float *x, int len) {
+void vec_fprint_f(FILE *stream, float *x, uint32_t len) {
   int i;
   fprintf(stream, "[");
   for (i=0;i<len;i++) {
@@ -143,7 +203,7 @@ void vec_fprint_f(FILE *stream, float *x, int len) {
 }
 
 
-void vec_fprint_b(FILE *stream, char *x, int len) {
+void vec_fprint_b(FILE *stream, char *x, uint32_t len) {
   int i;
   fprintf(stream, "[");
   for (i=0;i<len;i++) {
@@ -152,7 +212,7 @@ void vec_fprint_b(FILE *stream, char *x, int len) {
   fprintf(stream, "];\n");
 }
 
-void vec_fprint_i(FILE *stream, int *x, int len) {
+void vec_fprint_i(FILE *stream, int *x, uint32_t len) {
   int i;
   fprintf(stream, "[");
   for (i=0;i<len;i++) {
@@ -161,36 +221,116 @@ void vec_fprint_i(FILE *stream, int *x, int len) {
   fprintf(stream, "];\n");
 }
 
-void vec_conj_cc(cf_t *x, cf_t *y, int len) {
+void vec_fprint_hex(FILE *stream, char *x, uint32_t len) {
+  uint32_t i, nbytes, byte;
+  nbytes = len/8;
+  fprintf(stream, "[", len);
+  for (i=0;i<nbytes;i++) {
+    byte = bit_unpack(&x, 8);
+    fprintf(stream, "%02x ", byte);
+  }
+  if (len%8) {
+    byte = bit_unpack(&x, len%8);
+    fprintf(stream, "%02x ", byte);
+  }
+  fprintf(stream, "];\n");
+}
+
+void vec_save_file(char *filename, void *buffer, uint32_t len) {
+  FILE *f; 
+  f = fopen(filename, "w");
+  if (f) {
+    fwrite(buffer, len, 1, f);
+    fclose(f);
+  } else {
+    perror("fopen");
+  }  
+}
+
+void vec_conj_cc(cf_t *x, cf_t *y, uint32_t len) {
 #ifndef HAVE_VOLK_CONJ_FUNCTION
   int i;
   for (i=0;i<len;i++) {
     y[i] = conjf(x[i]);
   }
 #else
-  volk_32fc_conjugate_32fc_u(y,x,(unsigned int) len);
+  volk_32fc_conjugate_32fc(y,x,len);
+#endif
+}
+
+void vec_prod_cfc(cf_t *x, float *y, cf_t *z, uint32_t len) {
+#ifndef HAVE_VOLK_MULT_REAL_FUNCTION
+  int i;
+  for (i=0;i<len;i++) {
+    z[i] = x[i]*y[i];
+  }
+#else
+  volk_32fc_32f_multiply_32fc(z,x,y,len);
 #endif
 }
 
-void vec_prod_ccc(cf_t *x,cf_t *y, cf_t *z, int len) {
+
+void vec_prod_ccc(cf_t *x,cf_t *y, cf_t *z, uint32_t len) {
 #ifndef HAVE_VOLK_MULT2_FUNCTION
   int i;
   for (i=0;i<len;i++) {
     z[i] = x[i]*y[i];
   }
 #else
-  volk_32fc_x2_multiply_32fc_u(z,x,y,(unsigned int) len);
+  volk_32fc_x2_multiply_32fc(z,x,y,len);
 #endif
 }
 
-void vec_div_ccc(cf_t *x, cf_t *y, cf_t *z, int len) {
+void vec_div_ccc(cf_t *x, cf_t *y, cf_t *z, uint32_t len) {
   int i;
   for (i=0;i<len;i++) {
     z[i] = x[i] / y[i];
   }
 }
 
-float vec_avg_power_cf(cf_t *x, int len) {
+void vec_div_fff(float *x, float *y, float *z, uint32_t len) {
+#ifdef HAVE_VOLK_DIVIDE_FUNCTION
+  volk_32f_x2_divide_32f(z, x, y, len);
+#else
+  int i;
+  for (i=0;i<len;i++) {
+    z[i] = x[i] / y[i];
+  }
+#endif
+}
+
+cf_t vec_dot_prod_ccc(cf_t *x, cf_t *y, uint32_t len) {
+#ifdef HAVE_VOLK_DOTPROD_FC_FUNCTION
+  cf_t res;
+  volk_32fc_x2_dot_prod_32fc(&res, x, y, len);
+  return res; 
+#else 
+  uint32_t i;
+  cf_t res = 0;
+  for (i=0;i<len;i++) {
+    res += x[i]*y[i];
+  }
+  return res;
+#endif
+}
+
+float vec_dot_prod_fff(float *x, float *y, uint32_t len) {
+#ifdef HAVE_VOLK_DOTPROD_F_FUNCTION
+  float res;
+  volk_32f_x2_dot_prod_32f(&res, x, y, len);
+  return res; 
+#else 
+  uint32_t i;
+  float res = 0;
+  for (i=0;i<len;i++) {
+    res += x[i]*y[i];
+  }
+  return res;
+#endif  
+}
+
+
+float vec_avg_power_cf(cf_t *x, uint32_t len) {
   int j;
   float power = 0;
   for (j=0;j<len;j++) {
@@ -200,40 +340,42 @@ float vec_avg_power_cf(cf_t *x, int len) {
   return power / len;
 }
 
-void vec_prod_ccc_unalign(cf_t *x,cf_t *y, cf_t *z, int len) {
+void vec_abs_cf(cf_t *x, float *abs, uint32_t len) {
-#ifndef HAVE_VOLK_MULT_FUNCTION
+#ifndef HAVE_VOLK_MAG_FUNCTION
   int i;
   for (i=0;i<len;i++) {
-    z[i] = x[i]*y[i];
+    abs[i] = cabsf(x[i]);
   }
 #else
-  volk_32fc_x2_multiply_32fc_u(z,x,y,(unsigned int) len);
+  volk_32fc_magnitude_32f(abs,x,len);
+
 #endif
+
 }
 
-void vec_abs_cf(cf_t *x, float *abs, int len) {
+void vec_arg_cf(cf_t *x, float *arg, uint32_t len) {
-#ifndef HAVE_VOLK_MAG_FUNCTION
+#ifndef HAVE_VOLK_ATAN_FUNCTION
   int i;
   for (i=0;i<len;i++) {
-    abs[i] = cabsf(x[i]);
+    arg[i] = cargf(x[i]);
   }
 #else
-  volk_32fc_magnitude_32f_u(abs,x,(unsigned int) len);
+  volk_32fc_s32f_atan2_32f(arg,x,1,len);
 
 #endif
 
 }
 
-int vec_max_fi(float *x, int len) {
+uint32_t vec_max_fi(float *x, uint32_t len) {
 #ifdef HAVE_VOLK_MAX_FUNCTION
-  unsigned int target=0;
+  uint32_t target=0;
-  volk_32f_index_max_16u_u(&target,x,(unsigned int) len);
+  volk_32f_index_max_16u(&target,x,len);
-  return (int) target;
+  return target;
 
 #else
-  int i;
+  uint32_t i;
   float m=-FLT_MAX;
-  int p=0;
+  uint32_t p=0;
   for (i=0;i<len;i++) {
     if (x[i]>m) {
       m=x[i];
@@ -244,7 +386,7 @@ int vec_max_fi(float *x, int len) {
 #endif
 }
 
-void vec_quant_fuc(float *in, unsigned char *out, float gain, float offset, float clip, int len) {
+void vec_quant_fuc(float *in, unsigned char *out, float gain, float offset, float clip, uint32_t len) {
   int i;
   int tmp;
   for (i=0;i<len;i++) {

matlab/sync/find_pss.m

@@ -27,17 +27,5 @@ function [ fs eps p_m w2] = find_pss( x, N_id_2, doplot, threshold)
             mean(abs(w2)), m, 10*log10(m/mean(abs(w2))));
     end
     
-    % Estimate PSS-aided CFO
-    if (i > 128 && i<length(x)&& p_m > threshold)
-        y=ccf.*x(i-128:i-1);
-    
-        y0=y(1:64);
-        y1=y(65:length(y));    
-    
-        eps=angle(conj(sum(y0))*sum(y1))/pi;    
-    else
-         eps = NaN;
-         fs = NaN;
-    end
 end
 

matlab/sync/lte_generate_sss.m

@@ -1,123 +0,0 @@
-%
-% Copyright 2011-2012 Ben Wojtowicz
-%
-%    This program is free software: you can redistribute it and/or modify
-%    it under the terms of the GNU Affero General Public License as published by
-%    the Free Software Foundation, either version 3 of the License, or
-%    (at your option) any later version.
-%
-%    This program is distributed in the hope that it will be useful,
-%    but WITHOUT ANY WARRANTY; without even the implied warranty of
-%    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-%    GNU Affero General Public License for more details.
-%
-%    You should have received a copy of the GNU Affero General Public License
-%    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-%
-% Function:    lte_generate_sss
-% Description: Generates LTE secondary synchronization signals
-% Inputs:      N_id_1    - Physical layer cell identity group
-%              N_id_2    - Physical layer identity
-% Outputs:     sss_d_u_0 - The sequence d(n) used for the secondary
-%                          synchronization signal, an interleaved
-%                          concatenation of two length-31 binary
-%                          sequences for subframe 0
-% Outputs:     sss_d_u_5 - The sequence d(n) used for the secondary
-%                          synchronization signal, an interleaved
-%                          concatenation of two length-31 binary
-%                          sequences for subframe 5
-% Spec:        3GPP TS 36.211 section 6.11.2.1 v10.1.0
-% Notes:       None
-% Rev History: Ben Wojtowicz 10/28/2011 Created
-%              Ben Wojtowicz 01/29/2012 Fixed license statement
-%
-function [sss_d_u_0, sss_d_u_5 c0 c1 m0 m1] = lte_generate_sss(N_id_1, N_id_2)
-    % Validate N_id_1
-    if(~(N_id_1 >= 0 && N_id_1 <= 167))
-        fprintf('ERROR: Invalid N_id_1 (%u)\n', N_id_1);
-        sss_d_u_0 = 0;
-        sss_d_u_5 = 0;
-        return;
-    end
-
-    % Validate N_id_2
-    if(~(N_id_2 >= 0 && N_id_2 <= 2))
-        fprintf('ERROR: Invalid N_id_2 (%u)\n', N_id_2);
-        sss_d_u_0 = 0;
-        sss_d_u_5 = 0;
-        return;
-    end
-
-    % Generate m0 and m1
-    q_prime = floor(N_id_1/30);
-    q       = floor((N_id_1 + (q_prime*(q_prime+1)/2))/30);
-    m_prime = N_id_1 + (q*(q+1)/2);
-    m0      = mod(m_prime, 31);
-    m1      = mod((m0 + floor(m_prime/31) + 1), 31);
-
-    % Generate s_tilda
-    x_s_tilda(0+1) = 0;
-    x_s_tilda(1+1) = 0;
-    x_s_tilda(2+1) = 0;
-    x_s_tilda(3+1) = 0;
-    x_s_tilda(4+1) = 1;
-    for(i_hat=0:25)
-        x_s_tilda(i_hat+5+1) = mod((x_s_tilda(i_hat+2+1) + x_s_tilda(i_hat+1)), 2);
-    end
-    for(idx=0:30)
-        s_tilda(idx+1) = 1 - 2*x_s_tilda(idx+1);
-    end
-
-    % Generate c_tilda
-    x_c_tilda(0+1) = 0;
-    x_c_tilda(1+1) = 0;
-    x_c_tilda(2+1) = 0;
-    x_c_tilda(3+1) = 0;
-    x_c_tilda(4+1) = 1;
-    for(i_hat=0:25)
-        x_c_tilda(i_hat+5+1) = mod((x_c_tilda(i_hat+3+1) + x_c_tilda(i_hat+1)), 2);
-    end
-    for(idx=0:30)
-        c_tilda(idx+1) = 1 - 2*x_c_tilda(idx+1);
-    end
-
-    % Generate z_tilda
-    x_z_tilda(0+1) = 0;
-    x_z_tilda(1+1) = 0;
-    x_z_tilda(2+1) = 0;
-    x_z_tilda(3+1) = 0;
-    x_z_tilda(4+1) = 1;
-    for(i_hat=0:25)
-        x_z_tilda(i_hat+5+1) = mod((x_z_tilda(i_hat+4+1) + x_z_tilda(i_hat+2+1) + x_z_tilda(i_hat+1+1) + x_z_tilda(i_hat+1)), 2);
-    end
-    for(idx=0:30)
-        z_tilda(idx+1) = 1 - 2*x_z_tilda(idx+1);
-    end
-
-    % Generate s0_m0 and s1_m1
-    for(n=0:30)
-        s0_m0(n+1) = s_tilda(mod(n + m0, 31)+1);
-        s1_m1(n+1) = s_tilda(mod(n + m1, 31)+1);
-    end
-
-    % Generate c0 and c1
-    for(n=0:30)
-        c0(n+1) = c_tilda(mod(n + N_id_2, 31)+1);
-        c1(n+1) = c_tilda(mod(n + N_id_2 + 3, 31)+1);
-    end
-
-    % Generate z1_m0 and z1_m1
-    for(n=0:30)
-        z1_m0(n+1) = z_tilda(mod(n + mod(m0, 8), 31)+1);
-        z1_m1(n+1) = z_tilda(mod(n + mod(m1, 8), 31)+1);
-    end
-
-    % Generate SSS
-    for(n=0:30)
-        sss_d_u_0(2*n+1)   = s0_m0(n+1) * c0(n+1);
-        sss_d_u_5(2*n+1)   = s1_m1(n+1) * c0(n+1);
-
-        sss_d_u_0(2*n+1+1) = s1_m1(n+1) * c1(n+1) * z1_m0(n+1);
-        sss_d_u_5(2*n+1+1) = s0_m0(n+1) * c1(n+1) * z1_m1(n+1);
-    end
-end

matlab/sync/test.m

@@ -1,35 +0,0 @@
-N=128; %128 subcarries
-M=16; %QAM order
-cp=9; %length of the cyclic prefix... Is increasing the cyclic prefix size gonna increase the efficiency?
-scale = 1/sqrt(10);
-hMod = modem.qammod(M); %QAM Modulator
-hDemod = modem.qamdemod(hMod);  %QAM demodulator
-loops = 10;
-SNR =0:5:35;
-t1= cputime ;
-% transmited signal. Contains N data points ranging from 0 to M-1
-ber=zeros(5,length(SNR));
-%% Creating the Rayleigh Multipath Channels 
-Ch = rayleighchan(1/1000,10);
-Ch.ResetBeforeFiltering = 0;
-sig = 1i*ones(loops,1);
-h1 = filter(Ch,sig);
-h2 = 0.1072*filter(Ch,sig);
-h3 = 0.0120*filter(Ch,sig);
-h4 = 0.0052*filter(Ch,sig);
-% Delay Values 
-l1 = 4;
-l2 = 7;
-l3= 16;
-%%
-ofdm_cp=[];
-    %tx=transmited_data;
-    for ik=1:loops%number of loops
-        tx = randi([0 M-1],1,N);  % generate random data
-        sig=modulate(hMod, tx)*scale; % Modulate QAM modulated signal, devide by the square root of 10 to bring the average power of the signal to 1
-        ofdm=sqrt(N).*ifft(sig,N); % generate OFDM signal IFFT on the parrellel data,multiply by sqrt(N) to adjust to the matlab computation ,
-        ofdm_cp = [ofdm_cp ofdm(N-cp+1:N) ofdm]; % Add cyclic prefix
-       
-      end
-  
-