Changed eNodeB console prompt

lte/examples/pdsch_enodeb.c

@@ -107,7 +107,7 @@ void usage(char *prog) {
   printf("\t-n number of frames [Default %d]\n", nof_frames);
   printf("\t-c cell id [Default %d]\n", cell.id);
   printf("\t-p nof_prb [Default %d]\n", cell.nof_prb);
-  printf("\t-u listen UDP port for input data (-1 is random) [Default %d]\n", net_port);
+  printf("\t-u listen TCP port for input data (-1 is random) [Default %d]\n", net_port);
   printf("\t-v [set verbose to debug, default none]\n");
 }
 
@@ -328,7 +328,8 @@ int update_radl() {
   ra_mcs_from_idx_dl(mcs_idx, prb_alloc.slot[0].nof_prb, &ra_dl.mcs);
 
   ra_pdsch_fprint(stdout, &ra_dl, cell.nof_prb);
-
+  printf("Type new MCS index and press Enter: "); fflush(stdout);
+  
   pdsch_harq_reset(&harq_process);
   if (pdsch_harq_setup(&harq_process, ra_dl.mcs, &prb_alloc)) {
     fprintf(stderr, "Error configuring HARQ process\n");
@@ -374,7 +375,6 @@ int update_control() {
               prbset_num--;          
             break;          
         }
-        printf("num: %d, orig: %d\n", prbset_num, prbset_orig);
       } else {
         last_mcs_idx = mcs_idx; 
         mcs_idx = atoi(input);          
@@ -604,8 +604,6 @@ int main(int argc, char **argv) {
       nf++;
     }
     sfn = (sfn + 1) % 1024;
-    printf("SFN: %4d\tType new MCS index and press Enter\r", sfn);
-    fflush(stdout);
   }
 
   base_free();

lte/examples/pdsch_ue.c

@@ -125,8 +125,8 @@ void usage(prog_args_t *args, char *prog) {
   printf("\t-n nof_subframes [Default %d]\n", args->nof_subframes);
   printf("\t-s remote UDP port to send input signal (-1 does nothing with it) [Default %d]\n", args->net_port_signal);
   printf("\t-S remote UDP address to send input signal [Default %s]\n", args->net_address_signal);
-  printf("\t-u remote UDP port to send data (-1 does nothing with it) [Default %d]\n", args->net_port);
+  printf("\t-u remote TCP port to send data (-1 does nothing with it) [Default %d]\n", args->net_port);
-  printf("\t-U remote UDP address to send data [Default %s]\n", args->net_address);
+  printf("\t-U remote TCP address to send data [Default %s]\n", args->net_address);
   printf("\t-v [set verbose to debug, default none]\n");
 }
 
@@ -421,6 +421,20 @@ int main(int argc, char **argv) {
             if (isnan(rsrp)) {
               rsrp = 0; 
             }
+            
+            /* Adjust channel estimator based on SNR */
+            if (10*log10(snr) < 5.0) {
+              float f_low_snr[5]={0.05, 0.15, 0.6, 0.15, 0.05};
+              chest_dl_set_filter_freq(&ue_dl.chest, f_low_snr, 5);
+            } else if (10*log10(snr) < 10.0) {
+              float f_mid_snr[3]={0.1, 0.8, 0.1};
+              chest_dl_set_filter_freq(&ue_dl.chest, f_mid_snr, 3);
+            } else {
+              float f_high_snr[3]={0.05, 0.9, 0.05};
+              chest_dl_set_filter_freq(&ue_dl.chest, f_high_snr, 3);
+            }
+              
+            
           }
           if (ue_sync_get_sfidx(&ue_sync) != 5 && ue_sync_get_sfidx(&ue_sync) != 0) {
             pdcch_tx++;

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

@@ -0,0 +1,83 @@
+/**
+ *
+ * \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 REFSIGNAL_UL_
+#define REFSIGNAL_DL_
+
+/* Object to manage Downlink reference signals for channel estimation.
+ *
+ */
+
+#include "liblte/config.h"
+#include "liblte/phy/common/phy_common.h"
+
+typedef _Complex float cf_t;
+
+// Number of references in a subframe: there are 2 symbols for port_id=0,1 x 2 slots x 2 refs per prb
+#define REFSIGNAL_NUM_SF(nof_prb, port_id)     (((port_id)<2?8:4)*(nof_prb))
+#define REFSIGNAL_MAX_NUM_SF(nof_prb)     REFSIGNAL_NUM_SF(nof_prb, 0)
+
+#define REFSIGNAL_PILOT_IDX(i,l,cell) (2*cell.nof_prb*(l)+(i))
+
+
+/** Cell-Specific Reference Signal */
+typedef struct LIBLTE_API {
+  lte_cell_t cell; 
+  cf_t *pilots[2][NSUBFRAMES_X_FRAME]; // Saves the reference signal per subframe for ports 0,1 and ports 2,3
+} refsignal_cs_t;
+
+
+LIBLTE_API int refsignal_cs_generate(refsignal_cs_t *q, 
+                                     lte_cell_t cell);
+
+LIBLTE_API void refsignal_cs_free(refsignal_cs_t *q);
+
+LIBLTE_API int refsignal_cs_put_sf(lte_cell_t cell, 
+                                   uint32_t port_id, 
+                                   cf_t *pilots,
+                                   cf_t *sf_symbols);
+
+LIBLTE_API int refsignal_cs_get_sf(lte_cell_t cell, 
+                                   uint32_t port_id, 
+                                   cf_t *sf_symbols, 
+                                   cf_t *pilots);
+
+LIBLTE_API uint32_t refsignal_fidx(lte_cell_t cell, 
+                                   uint32_t l, 
+                                   uint32_t port_id, 
+                                   uint32_t m);
+
+LIBLTE_API uint32_t refsignal_nsymbol(uint32_t l, 
+                                      lte_cp_t cp, 
+                                      uint32_t port_id);
+
+LIBLTE_API uint32_t refsignal_cs_v(uint32_t port_id, 
+                                   uint32_t ref_symbol_idx); 
+
+LIBLTE_API uint32_t refsignal_cs_nof_symbols(uint32_t port_id);
+
+#endif

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

@@ -1,5 +1,45 @@
+/**
+ *
+ * \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/.
+ *
+ */
+
+#ifdef compile
+
+#include <math.h>
+#include <string.h>
+#include <strings.h>
+#include <stdlib.h>
+#include <complex.h>
+
+#include "liblte/phy/common/phy_common.h"
+#include "liblte/phy/ch_estimation/refsignal_ul.h"
+#include "liblte/phy/utils/vector.h"
+#include "liblte/phy/utils/debug.h"
+#include "liblte/phy/common/sequence.h"
+
 
-#ifdef nocompile
 // n_drms_2 table 5.5.2.1.1-1 from 36.211
 uint32_t n_drms_2[8] = { 0, 6, 3, 4, 2, 8, 10, 9 };
 
@@ -180,4 +220,6 @@ free_and_exit:
   return ret;
 }
 
-#endif
+#endif
+
+

matlab/tests/pdcch_bler.m

@@ -5,14 +5,14 @@
 clear
 
 Npackets = 1000;
-SNR_values = linspace(-0.5,3,6);
+SNR_values = linspace(-5,0,8);
 
 txCFI = 3; 
 enbConfig.NDLRB = 15;                % No of Downlink RBs in total BW
 enbConfig.CyclicPrefix = 'Normal';  % CP length
 enbConfig.CFI = txCFI;                                                                                                                                                                                                                                                                                                                                                                                                                           ;                  % 4 PDCCH symbols as NDLRB <= 10
 enbConfig.Ng = 'Sixth';             % HICH groups
-enbConfig.CellRefP = 1;             % 1-antenna ports
+enbConfig.CellRefP = 2;             % 1-antenna ports
 enbConfig.NCellID = 0;             % Physical layer cell identity
 enbConfig.NSubframe = 5;            % Subframe number 0
 enbConfig.DuplexMode = 'FDD';       % Frame structure