5g-team
/
srsRAN_4G
mirror of https://github.com/pvnis/srsRAN_4G.git
2
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Added SIB4. Improved CP detection.

Browse Source
master
ismagom 10 years ago
parent 28ab43c6e9
commit ecbd3dda2c
32 changed files with 738 additions and 432 deletions
Show Stats Download Patch File Download Diff File

102
lte/examples/cell_measurement.c
Unescape Escape View File

@ -47,9 +47,8 @@
float gain_offset = B210_DEFAULT_GAIN_CORREC; float gain_offset = B210_DEFAULT_GAIN_CORREC;
cell_detect_cfg_t cell_detect_config = { cell_detect_cfg_t cell_detect_config = {
500, // nof_frames_total 100, // nof_frames_total
50, // nof_frames_detected 3.0 // early-stops cell detection if mean PSR is above this value
0.4 // threshold
}; };
/********************************************************************** /**********************************************************************
@ -126,7 +125,10 @@ int cuhd_recv_wrapper(void *h, void *data, uint32_t nsamples) {
extern float mean_exec_time; extern float mean_exec_time;
enum receiver_state { DECODE_MIB, DECODE_SIB, MEASURE} state; enum receiver_state { DECODE_MIB, DECODE_SIB, DECODE_SIB4, MEASURE} state;
#define MAX_SINFO 10
#define MAX_NEIGHBOUR_CELLS 128
int main(int argc, char **argv) { int main(int argc, char **argv) {
int ret; int ret;
@ -148,6 +150,11 @@ int main(int argc, char **argv) {
uint32_t sfn_offset; uint32_t sfn_offset;
float rssi_utra=0,rssi=0, rsrp=0, rsrq=0, snr=0; float rssi_utra=0,rssi=0, rsrp=0, rsrq=0, snr=0;
cf_t *nullce[MAX_PORTS]; cf_t *nullce[MAX_PORTS];
uint32_t si_window_length;
scheduling_info_t sinfo[MAX_SINFO];
scheduling_info_t *sinfo_sib4 = NULL;
uint32_t neighbour_cell_ids[MAX_NEIGHBOUR_CELLS];
for (int i=0;i<MAX_PORTS;i++) { for (int i=0;i<MAX_PORTS;i++) {
nullce[i] = NULL; nullce[i] = NULL;
@ -173,7 +180,9 @@ int main(int argc, char **argv) {
exit(-1); exit(-1);
} }
cuhd_start_rx_stream(uhd); INFO("Stopping UHD and flushing buffer...\n",0);
cuhd_stop_rx_stream(uhd);
cuhd_flush_buffer(uhd);
if (ue_sync_init(&ue_sync, cell, cuhd_recv_wrapper, uhd)) { if (ue_sync_init(&ue_sync, cell, cuhd_recv_wrapper, uhd)) {
fprintf(stderr, "Error initiating ue_sync\n"); fprintf(stderr, "Error initiating ue_sync\n");
@ -187,7 +196,9 @@ int main(int argc, char **argv) {
fprintf(stderr, "Error initaiting UE MIB decoder\n"); fprintf(stderr, "Error initaiting UE MIB decoder\n");
exit(-1); exit(-1);
} }
pdsch_set_rnti(&ue_dl.pdsch, SIRNTI);
/* Configure downlink receiver for the SI-RNTI since will be the only one we'll use */
ue_dl_set_rnti(&ue_dl, SIRNTI);
/* Initialize subframe counter */ /* Initialize subframe counter */
sf_cnt = 0; sf_cnt = 0;
@ -204,7 +215,12 @@ int main(int argc, char **argv) {
int sf_re = SF_LEN_RE(cell.nof_prb, cell.cp); int sf_re = SF_LEN_RE(cell.nof_prb, cell.cp);
cf_t *sf_symbols = vec_malloc(sf_re * sizeof(cf_t)); cf_t *sf_symbols = vec_malloc(sf_re * sizeof(cf_t));
cuhd_start_rx_stream(uhd);
bool sib4_window_start = false;
uint32_t sib4_window_cnt = 0;
/* Main loop */ /* Main loop */
while (sf_cnt < prog_args.nof_subframes || prog_args.nof_subframes == -1) { while (sf_cnt < prog_args.nof_subframes || prog_args.nof_subframes == -1) {
@ -229,17 +245,17 @@ int main(int argc, char **argv) {
} else if (n == MIB_FOUND) { } else if (n == MIB_FOUND) {
bit_unpack_vector(bch_payload_unpacked, bch_payload, BCH_PAYLOAD_LEN); bit_unpack_vector(bch_payload_unpacked, bch_payload, BCH_PAYLOAD_LEN);
bcch_bch_unpack(bch_payload, BCH_PAYLOAD_LEN, &cell, &sfn); bcch_bch_unpack(bch_payload, BCH_PAYLOAD_LEN, &cell, &sfn);
printf("MIB found SFN: %d, offset: %d\n", sfn, sfn_offset); printf("Decoded MIB. SFN: %d, offset: %d\n", sfn, sfn_offset);
sfn = (sfn<<2) + sfn_offset; sfn = (sfn + sfn_offset)%1024;
state = DECODE_SIB; state = DECODE_SIB;
} }
} }
break; break;
case DECODE_SIB: case DECODE_SIB:
sfn=0; // FIXME: Use correct SFN!!
/* We are looking for SI Blocks, search only in appropiate places */ /* We are looking for SI Blocks, search only in appropiate places */
if ((ue_sync_get_sfidx(&ue_sync) == 5 && (sfn%2)==0)) { if ((ue_sync_get_sfidx(&ue_sync) == 5 && (sfn%2)==0)) {
n = ue_dl_decode(&ue_dl, sf_buffer, data, ue_sync_get_sfidx(&ue_sync), sfn, SIRNTI); n = ue_dl_decode_sib(&ue_dl, sf_buffer, data, ue_sync_get_sfidx(&ue_sync),
((int) ceilf((float)3*(((sfn)/2)%4)/2))%4);
if (n < 0) { if (n < 0) {
fprintf(stderr, "Error decoding UE DL\n");fflush(stdout); fprintf(stderr, "Error decoding UE DL\n");fflush(stdout);
exit(-1); exit(-1);
@ -250,17 +266,74 @@ int main(int argc, char **argv) {
(float) ue_dl.nof_pdcch_detected/nof_trials); (float) ue_dl.nof_pdcch_detected/nof_trials);
nof_trials++; nof_trials++;
} else { } else {
printf("\n\nDecoded SIB1 Message Len %d: ",n);
bit_unpack_vector(data, data_unpacked, n); bit_unpack_vector(data, data_unpacked, n);
void *dlsch_msg = bcch_dlsch_unpack(data_unpacked, n); void *dlsch_msg = bcch_dlsch_unpack(data_unpacked, n);
if (dlsch_msg) { if (dlsch_msg) {
printf("\n");fflush(stdout); printf("\n");fflush(stdout);
cell_access_info_t cell_info; cell_access_info_t cell_info;
bcch_dlsch_sib1_get_cell_access_info(dlsch_msg, &cell_info); bcch_dlsch_sib1_get_cell_access_info(dlsch_msg, &cell_info);
printf("Cell ID: 0x%x\n", cell_info.cell_id); printf("Decoded SIB1. Cell ID: 0x%x\n", cell_info.cell_id);
bcch_dlsch_fprint(dlsch_msg, stdout);
/* Get SIB4 scheduling */
int nsinfo = bcch_dlsch_sib1_get_scheduling_info(dlsch_msg, &si_window_length, sinfo, MAX_SINFO);
/* find SIB4 */
for (int i=0;i<nsinfo && !sinfo_sib4;i++) {
if (sinfo[i].type == SIB4) {
sinfo_sib4 = &sinfo[i];
}
}
ue_dl.nof_pdcch_detected = nof_trials = 0;
sib4_window_start = false;
bzero(data, sizeof(data));
ue_dl_reset(&ue_dl);
}
if (sinfo_sib4) {
state = DECODE_SIB4;
} else {
state = MEASURE;
}
}
}
break;
case DECODE_SIB4:
if (!sib4_window_start &&
((sfn%sinfo_sib4->period) == sinfo_sib4->n*si_window_length/10) &&
ue_sync_get_sfidx(&ue_sync) == (sinfo_sib4->n*si_window_length%10)) {
sib4_window_start = true;
sib4_window_cnt = 0;
}
/* We are looking for SI Blocks, search only in appropiate places */
if (sib4_window_start && !(ue_sync_get_sfidx(&ue_sync) == 5 && (sfn%2)==0))
{
/* printf("[%d/%d]: Trying SIB4 in SF: %d, SFN: %d\n", sib4_window_cnt, si_window_length,
ue_sync_get_sfidx(&ue_sync), sfn);
*/ n = ue_dl_decode_sib(&ue_dl, sf_buffer, data, ue_sync_get_sfidx(&ue_sync),
((int) ceilf((float)3*sib4_window_cnt/2))%4);
if (n < 0) {
fprintf(stderr, "Error decoding UE DL\n");fflush(stdout);
exit(-1);
} else if (n == 0) {
nof_trials++;
} else {
bit_unpack_vector(data, data_unpacked, n);
void *dlsch_msg = bcch_dlsch_unpack(data_unpacked, n);
int nof_cell = bcch_dlsch_sib4_get_neighbour_cells(dlsch_msg, neighbour_cell_ids, MAX_NEIGHBOUR_CELLS);
printf("Decoded SIB4. Neighbour cell list (PhyIDs): ");
for (int i=0;i<nof_cell;i++) {
printf("%d, ", neighbour_cell_ids[i]);
} }
printf("\n");
state = MEASURE; state = MEASURE;
} }
sib4_window_cnt++;
if (sib4_window_cnt == si_window_length) {
sib4_window_start = false;
exit(-1);
}
} }
break; break;
case MEASURE: case MEASURE:
@ -268,8 +341,7 @@ int main(int argc, char **argv) {
lte_fft_run_sf(&fft, sf_buffer, sf_symbols); lte_fft_run_sf(&fft, sf_buffer, sf_symbols);
chest_dl_estimate(&chest, sf_symbols, nullce, ue_sync_get_sfidx(&ue_sync)); chest_dl_estimate(&chest, sf_symbols, nullce, ue_sync_get_sfidx(&ue_sync));
rssi = VEC_CMA(vec_avg_power_cf(sf_buffer,SF_LEN(lte_symbol_sz(cell.nof_prb))),rssi,nframes); rssi = VEC_CMA(vec_avg_power_cf(sf_buffer,SF_LEN(lte_symbol_sz(cell.nof_prb))),rssi,nframes);
rssi_utra = VEC_CMA(chest_dl_get_rssi(&chest),rssi_utra,nframes); rssi_utra = VEC_CMA(chest_dl_get_rssi(&chest),rssi_utra,nframes);
rsrq = VEC_EMA(chest_dl_get_rsrq(&chest),rsrq,0.001); rsrq = VEC_EMA(chest_dl_get_rsrq(&chest),rsrq,0.001);
@ -289,7 +361,7 @@ int main(int argc, char **argv) {
} }
break; break;
} }
if (ue_sync_get_sfidx(&ue_sync) == 0) { if (ue_sync_get_sfidx(&ue_sync) == 9) {
sfn++; sfn++;
if (sfn == 1024) { if (sfn == 1024) {
sfn = 0; sfn = 0;

6
lte/examples/cell_search.c
Unescape Escape View File

@ -55,7 +55,7 @@
int band = -1; int band = -1;
int earfcn_start=-1, earfcn_end = -1; int earfcn_start=-1, earfcn_end = -1;
cell_detect_cfg_t config = {50, 10, CS_FIND_THRESHOLD}; cell_detect_cfg_t config = {50, 1.1};
float uhd_gain = 60.0; float uhd_gain = 60.0;
@ -68,7 +68,6 @@ void usage(char *prog) {
printf("\t-s earfcn_start [Default All]\n"); printf("\t-s earfcn_start [Default All]\n");
printf("\t-e earfcn_end [Default All]\n"); printf("\t-e earfcn_end [Default All]\n");
printf("\t-n nof_frames_total [Default 100]\n"); printf("\t-n nof_frames_total [Default 100]\n");
printf("\t-d nof_frames_detected [Default 10]\n");
printf("\t-t threshold [Default %.2f]\n",config.threshold); printf("\t-t threshold [Default %.2f]\n",config.threshold);
printf("\t-v [set verbose to debug, default none]\n"); printf("\t-v [set verbose to debug, default none]\n");
} }
@ -92,9 +91,6 @@ void parse_args(int argc, char **argv) {
case 'n': case 'n':
config.nof_frames_total = atoi(argv[optind]); config.nof_frames_total = atoi(argv[optind]);
break; break;
case 'd':
config.nof_frames_detected = atoi(argv[optind]);
break;
case 't': case 't':
config.threshold = atof(argv[optind]); config.threshold = atof(argv[optind]);
break; break;

20
lte/examples/cell_search_utils.c
Unescape Escape View File

@ -118,7 +118,7 @@ int detect_cell(cell_detect_cfg_t *config, void *uhd, ue_celldetect_result_t *fo
int ret = LIBLTE_ERROR; int ret = LIBLTE_ERROR;
ue_celldetect_t cd; ue_celldetect_t cd;
cf_t *buffer = vec_malloc(sizeof(cf_t) * 96000); cf_t *buffer = vec_malloc(sizeof(cf_t) * CS_FLEN);
if (!buffer) { if (!buffer) {
perror("malloc"); perror("malloc");
goto free_and_exit; goto free_and_exit;
@ -129,9 +129,6 @@ int detect_cell(cell_detect_cfg_t *config, void *uhd, ue_celldetect_result_t *fo
goto free_and_exit; goto free_and_exit;
} }
if (config->nof_frames_detected) {
ue_celldetect_set_nof_frames_detected(&cd, config->nof_frames_detected);
}
if (config->nof_frames_total) { if (config->nof_frames_total) {
ue_celldetect_set_nof_frames_total(&cd, config->nof_frames_total); ue_celldetect_set_nof_frames_total(&cd, config->nof_frames_total);
} }
@ -139,12 +136,12 @@ int detect_cell(cell_detect_cfg_t *config, void *uhd, ue_celldetect_result_t *fo
ue_celldetect_set_threshold(&cd, config->threshold); ue_celldetect_set_threshold(&cd, config->threshold);
} }
INFO("Setting sampling frequency 960 KHz for PSS search\n", 0); INFO("Setting sampling frequency %.2f MHz for PSS search\n", CS_SAMP_FREQ/1000);
cuhd_set_rx_srate(uhd, 960000.0); cuhd_set_rx_srate(uhd, CS_SAMP_FREQ);
INFO("Starting receiver...\n", 0); INFO("Starting receiver...\n", 0);
cuhd_start_rx_stream(uhd); cuhd_start_rx_stream(uhd);
uint32_t flen = 4800; uint32_t flen = CS_FLEN;
int n; int n;
bzero(found_cell, sizeof(ue_celldetect_result_t)); bzero(found_cell, sizeof(ue_celldetect_result_t));
@ -171,11 +168,10 @@ int detect_cell(cell_detect_cfg_t *config, void *uhd, ue_celldetect_result_t *fo
case CS_CELL_DETECTED: case CS_CELL_DETECTED:
ue_celldetect_get_cell(&cd, found_cell); ue_celldetect_get_cell(&cd, found_cell);
if (found_cell->peak > 0) { if (found_cell->peak > 0) {
printf("\n\tCELL ID: %d, CP: %s, Peak: %.2f, Mode: %d/%d\n", printf("\n\tCELL ID: %d, CP: %s, Peak: %.2f, Mode: %.0f%%\n",
found_cell->cell_id, found_cell->cell_id,
lte_cp_string(found_cell->cp), lte_cp_string(found_cell->cp),
found_cell->peak, found_cell->mode, found_cell->peak, found_cell->mode*100);
cd.nof_frames_detected);
} }
ret = 1; ret = 1;
@ -183,7 +179,7 @@ int detect_cell(cell_detect_cfg_t *config, void *uhd, ue_celldetect_result_t *fo
break; break;
case CS_CELL_NOT_DETECTED: case CS_CELL_NOT_DETECTED:
ret = 0; ret = 0;
DEBUG("No cell found at N_id_2=%d\n",N_id_2); printf("No cell found at N_id_2=%d. Mean PSR: %.2f\n",N_id_2, sync_get_peak_value(&cd.sfind));
break; break;
case LIBLTE_ERROR: case LIBLTE_ERROR:
case LIBLTE_ERROR_INVALID_INPUTS: case LIBLTE_ERROR_INVALID_INPUTS:
@ -271,8 +267,6 @@ int detect_and_decode_cell(cell_detect_cfg_t *config, void *uhd, int force_N_id_
cell->nof_ports = nof_tx_ports; cell->nof_ports = nof_tx_ports;
bit_unpack_vector(bch_payload, bch_payload_unpacked, BCH_PAYLOAD_LEN); bit_unpack_vector(bch_payload, bch_payload_unpacked, BCH_PAYLOAD_LEN);
printf("nof_bits: %d\n", BCH_PAYLOAD_LEN);
vec_fprint_hex(stdout, bch_payload, BCH_PAYLOAD_LEN);
bcch_bch_unpack(bch_payload_unpacked, BCH_PAYLOAD_LEN, cell, NULL); bcch_bch_unpack(bch_payload_unpacked, BCH_PAYLOAD_LEN, cell, NULL);
/* set sampling frequency */ /* set sampling frequency */

5
lte/examples/cell_search_utils.h
Unescape Escape View File

@ -29,9 +29,8 @@
#include "liblte/phy/phy.h" #include "liblte/phy/phy.h"
typedef struct LIBLTE_API { typedef struct LIBLTE_API {
uint32_t nof_frames_total; uint32_t nof_frames_total; // maximum number of 5ms frames to capture
uint32_t nof_frames_detected; float threshold; // early-stops cell detection if mean PSR is above this value
float threshold;
}cell_detect_cfg_t; }cell_detect_cfg_t;
int decode_pbch(void *uhd, int decode_pbch(void *uhd,

143
lte/examples/pdsch_ue.c
Unescape Escape View File

@ -47,10 +47,15 @@ void do_plots(ue_dl_t *q, uint32_t sf_idx);
#endif #endif
#define B210_DEFAULT_GAIN 40.0
#define B210_DEFAULT_GAIN_CORREC 80.0 // Gain of the Rx chain when the gain is set to 40
float gain_offset = B210_DEFAULT_GAIN_CORREC;
cell_detect_cfg_t cell_detect_config = { cell_detect_cfg_t cell_detect_config = {
500, // nof_frames_total 100, // nof_frames_total
50, // nof_frames_detected 4.0 // threshold
CS_FIND_THRESHOLD // threshold
}; };
/********************************************************************** /**********************************************************************
@ -150,6 +155,9 @@ int cuhd_recv_wrapper(void *h, void *data, uint32_t nsamples) {
extern float mean_exec_time; extern float mean_exec_time;
enum receiver_state { DECODE_MIB, DECODE_SIB} state;
int main(int argc, char **argv) { int main(int argc, char **argv) {
int ret; int ret;
cf_t *sf_buffer; cf_t *sf_buffer;
@ -165,7 +173,6 @@ int main(int argc, char **argv) {
int n; int n;
uint8_t bch_payload[BCH_PAYLOAD_LEN], bch_payload_unpacked[BCH_PAYLOAD_LEN]; uint8_t bch_payload[BCH_PAYLOAD_LEN], bch_payload_unpacked[BCH_PAYLOAD_LEN];
uint32_t sfn_offset; uint32_t sfn_offset;
float snr = 0;
parse_args(&prog_args, argc, argv); parse_args(&prog_args, argc, argv);
#ifndef DISABLE_GRAPHICS #ifndef DISABLE_GRAPHICS
@ -191,8 +198,10 @@ int main(int argc, char **argv) {
fprintf(stderr, "Cell not found\n"); fprintf(stderr, "Cell not found\n");
exit(-1); exit(-1);
} }
cuhd_start_rx_stream(uhd); INFO("Stopping UHD and flushing buffer...\r",0);
cuhd_stop_rx_stream(uhd);
cuhd_flush_buffer(uhd);
if (ue_sync_init(&ue_sync, cell, cuhd_recv_wrapper, uhd)) { if (ue_sync_init(&ue_sync, cell, cuhd_recv_wrapper, uhd)) {
fprintf(stderr, "Error initiating ue_sync\n"); fprintf(stderr, "Error initiating ue_sync\n");
@ -207,7 +216,8 @@ int main(int argc, char **argv) {
exit(-1); exit(-1);
} }
pdsch_set_rnti(&ue_dl.pdsch, prog_args.rnti); /* Configure downlink receiver for the SI-RNTI since will be the only one we'll use */
ue_dl_set_rnti(&ue_dl, prog_args.rnti);
/* Initialize subframe counter */ /* Initialize subframe counter */
sf_cnt = 0; sf_cnt = 0;
@ -215,74 +225,91 @@ int main(int argc, char **argv) {
// Register Ctrl+C handler // Register Ctrl+C handler
signal(SIGINT, sig_int_handler); signal(SIGINT, sig_int_handler);
bool pbch_decoded = false; cuhd_start_rx_stream(uhd);
// Variables for measurements
uint32_t nframes=0;
float rsrp=0, rsrq=0, snr=0;
/* Main loop */ /* Main loop */
while (go_exit == false && while (!go_exit && (sf_cnt < prog_args.nof_subframes || prog_args.nof_subframes == -1)) {
(sf_cnt < prog_args.nof_subframes || prog_args.nof_subframes == -1))
{
ret = ue_sync_get_buffer(&ue_sync, &sf_buffer); ret = ue_sync_get_buffer(&ue_sync, &sf_buffer);
if (ret < 0) { if (ret < 0) {
fprintf(stderr, "Error calling ue_sync_work()\n"); fprintf(stderr, "Error calling ue_sync_work()\n");
go_exit=true;
} }
/* ue_sync_get_buffer returns 1 if successfully read 1 aligned subframe */ /* ue_sync_get_buffer returns 1 if successfully read 1 aligned subframe */
if (ret == 1) { if (ret == 1) {
if (ue_sync_get_sfidx(&ue_sync) == 0) { switch (state) {
pbch_decode_reset(&ue_mib.pbch); case DECODE_MIB:
n = ue_mib_decode_aligned_frame(&ue_mib, if (ue_sync_get_sfidx(&ue_sync) == 0) {
sf_buffer, bch_payload_unpacked, pbch_decode_reset(&ue_mib.pbch);
NULL, &sfn_offset); n = ue_mib_decode_aligned_frame(&ue_mib,
if (n < 0) { sf_buffer, bch_payload_unpacked,
fprintf(stderr, "Error decoding UE MIB\n"); NULL, &sfn_offset);
go_exit=true; if (n < 0) {
} else if (n == MIB_FOUND) { fprintf(stderr, "Error decoding UE MIB\n");
bit_unpack_vector(bch_payload_unpacked, bch_payload, BCH_PAYLOAD_LEN); exit(-1);
bcch_bch_unpack(bch_payload, BCH_PAYLOAD_LEN, &cell, &sfn); } else if (n == MIB_FOUND) {
sfn = (sfn + sfn_offset)%1024; bit_unpack_vector(bch_payload_unpacked, bch_payload, BCH_PAYLOAD_LEN);
pbch_decoded = true; bcch_bch_unpack(bch_payload, BCH_PAYLOAD_LEN, &cell, &sfn);
} printf("Decoded MIB. SFN: %d, offset: %d\n", sfn, sfn_offset);
} sfn = (sfn + sfn_offset)%1024;
if (pbch_decoded) { state = DECODE_SIB;
/* We are looking for SI Blocks, search only in appropiate places */ }
if ((ue_sync_get_sfidx(&ue_sync) == 5 && (sfn%2)==0)) { }
n = ue_dl_decode(&ue_dl, sf_buffer, data, ue_sync_get_sfidx(&ue_sync), sfn, prog_args.rnti); break;
if (n < 0) { case DECODE_SIB:
fprintf(stderr, "Error decoding UE DL\n");fflush(stdout); /* We are looking for SI Blocks, search only in appropiate places */
} if ((ue_sync_get_sfidx(&ue_sync) == 5 && (sfn%2)==0)) {
nof_trials++; n = ue_dl_decode_sib(&ue_dl, sf_buffer, data, ue_sync_get_sfidx(&ue_sync),
snr = VEC_CMA(chest_dl_get_snr(&ue_dl.chest), snr, nof_trials); ((int) ceilf((float)3*(((sfn)/2)%4)/2))%4);
} if (n < 0) {
fprintf(stderr, "Error decoding UE DL\n");fflush(stdout);
exit(-1);
}
nof_trials++;
}
rsrq = VEC_EMA(chest_dl_get_rsrq(&ue_dl.chest),rsrq,0.001);
rsrp = VEC_CMA(chest_dl_get_rsrp(&ue_dl.chest),rsrp,nframes);
snr = VEC_CMA(chest_dl_get_snr(&ue_dl.chest),snr,nframes);
nframes++;
// Plot and Printf
if (ue_sync_get_sfidx(&ue_sync) == 0) {
printf("CFO: %+8.4f KHz, SFO: %+8.4f Khz, "
"RSRP: %+5.1f dBm, RSRQ: %5.1f dB, SNR: %4.1f dB, "
"PDCCH-Miss: %5.2f%%, PDSCH-BLER: %5.2f%% (%d blocks)\r",
ue_sync_get_cfo(&ue_sync)/1000, ue_sync_get_sfo(&ue_sync)/1000,
10*log10(rsrp*1000)-gain_offset,
10*log10(rsrq), 10*log10(snr),
100*(1-(float) ue_dl.nof_pdcch_detected/nof_trials),
(float) 100*ue_dl.pkt_errors/ue_dl.pkts_total,nof_trials, ue_dl.pkts_total);
}
break;
} }
} if (ue_sync_get_sfidx(&ue_sync) == 9) {
if (ue_sync_get_sfidx(&ue_sync) == 9) {
if (pbch_decoded) {
sfn++; sfn++;
if (sfn == 1024) { if (sfn == 1024) {
sfn = 0; sfn = 0;
} }
} }
#ifndef DISABLE_GRAPHICS
if (!prog_args.disable_plots && ue_sync_get_sfidx(&ue_sync) == 5) {
do_plots(&ue_dl, 5);
}
#endif
} else if (ret == 0) {
printf("Finding PSS... Peak: %8.1f, FrameCnt: %d, State: %d\r",
sync_get_peak_value(&ue_sync.sfind),
ue_sync.frame_total_cnt, ue_sync.state);
} }
#ifndef DISABLE_GRAPHICS
if (!prog_args.disable_plots && ue_sync_get_sfidx(&ue_sync) == 5) {
do_plots(&ue_dl, 5);
}
#endif
if ((sf_cnt%10)==0) {
printf("CFO: %+6.2f KHz, SFO: %+6.2f Khz, SNR: %5.1f dB, NOI: %.2f, "
"PDCCH-Miss: %5.2f%%, PDSCH-BLER: %5.2f%% (%d blocks)\r",
ue_sync_get_cfo(&ue_sync)/1000, ue_sync_get_sfo(&ue_sync)/1000,
10*log10f(snr), pdsch_average_noi(&ue_dl.pdsch),
100*(1-(float) ue_dl.nof_pdcch_detected/nof_trials),
(float) 100*ue_dl.pkt_errors/ue_dl.pkts_total,nof_trials, ue_dl.pkts_total);
}
sf_cnt++; sf_cnt++;
} // Main loop } // Main loop
ue_dl_free(&ue_dl); ue_dl_free(&ue_dl);
ue_mib_free(&ue_mib); ue_mib_free(&ue_mib);
ue_sync_free(&ue_sync); ue_sync_free(&ue_sync);

4
lte/phy/include/liblte/phy/common/phy_common.h
Unescape Escape View File

@ -32,6 +32,8 @@
#include <stdio.h> #include <stdio.h>
#include <stdint.h> #include <stdint.h>
#include <stdbool.h> #include <stdbool.h>
#include <math.h>
#include "liblte/config.h" #include "liblte/config.h"
#define NSUBFRAMES_X_FRAME 10 #define NSUBFRAMES_X_FRAME 10
@ -79,7 +81,7 @@ typedef enum {CPNORM, CPEXT} lte_cp_t;
#define CP_ISEXT(cp) (cp==CPEXT) #define CP_ISEXT(cp) (cp==CPEXT)
#define CP_NSYMB(cp) (CP_ISNORM(cp)?CPNORM_NSYMB:CPEXT_NSYMB) #define CP_NSYMB(cp) (CP_ISNORM(cp)?CPNORM_NSYMB:CPEXT_NSYMB)
#define CP(symbol_sz, c) ((c*symbol_sz)/2048) #define CP(symbol_sz, c) ((int) ceil((((float) (c)*(symbol_sz))/2048)))
#define CP_NORM(symbol, symbol_sz) ((symbol==0)?CP((symbol_sz),CPNORM_0_LEN):CP((symbol_sz),CPNORM_LEN)) #define CP_NORM(symbol, symbol_sz) ((symbol==0)?CP((symbol_sz),CPNORM_0_LEN):CP((symbol_sz),CPNORM_LEN))
#define CP_EXT(symbol_sz) (CP((symbol_sz),CPEXT_LEN)) #define CP_EXT(symbol_sz) (CP((symbol_sz),CPEXT_LEN))

2
lte/phy/include/liblte/phy/phch/pdsch.h
Unescape Escape View File

@ -115,6 +115,8 @@ LIBLTE_API int pdsch_harq_setup(pdsch_harq_t *p,
ra_mcs_t mcs, ra_mcs_t mcs,
ra_prb_t *prb_alloc); ra_prb_t *prb_alloc);
LIBLTE_API void pdsch_harq_reset(pdsch_harq_t *p);
LIBLTE_API void pdsch_harq_free(pdsch_harq_t *p); LIBLTE_API void pdsch_harq_free(pdsch_harq_t *p);
LIBLTE_API int pdsch_encode(pdsch_t *q, LIBLTE_API int pdsch_encode(pdsch_t *q,

8
lte/phy/include/liblte/phy/sync/pss.h
Unescape Escape View File

@ -48,7 +48,7 @@ typedef _Complex float cf_t; /* this is only a shortcut */
/* PSS processing options */ /* PSS processing options */
//#define PSS_ACCUMULATE_ABS // If enabled, accumulates the correlation absolute value on consecutive calls to pss_synch_find_pss #define PSS_ACCUMULATE_ABS // If enabled, accumulates the correlation absolute value on consecutive calls to pss_synch_find_pss
#define PSS_ABS_SQUARE // If enabled, compute abs square, otherwise computes absolute value only #define PSS_ABS_SQUARE // If enabled, compute abs square, otherwise computes absolute value only
@ -83,9 +83,8 @@ typedef struct LIBLTE_API {
cf_t *pss_signal_freq[3]; // One sequence for each N_id_2 cf_t *pss_signal_freq[3]; // One sequence for each N_id_2
cf_t *tmp_input; cf_t *tmp_input;
cf_t *conv_output; cf_t *conv_output;
#ifdef PSS_ACCUMULATE_ABS
float *conv_output_abs; float *conv_output_abs;
#endif float ema_alpha;
float *conv_output_avg; float *conv_output_avg;
}pss_synch_t; }pss_synch_t;
@ -111,6 +110,9 @@ LIBLTE_API void pss_put_slot(cf_t *pss_signal,
uint32_t nof_prb, uint32_t nof_prb,
lte_cp_t cp); lte_cp_t cp);
LIBLTE_API void pss_synch_set_ema_alpha(pss_synch_t *q,
float alpha);
LIBLTE_API int pss_synch_set_N_id_2(pss_synch_t *q, LIBLTE_API int pss_synch_set_N_id_2(pss_synch_t *q,
uint32_t N_id_2); uint32_t N_id_2);

39
lte/phy/include/liblte/phy/sync/sync.h
Unescape Escape View File

@ -35,6 +35,7 @@
#include "liblte/config.h" #include "liblte/config.h"
#include "liblte/phy/sync/pss.h" #include "liblte/phy/sync/pss.h"
#include "liblte/phy/sync/sss.h" #include "liblte/phy/sync/sss.h"
#include "liblte/phy/sync/cfo.h"
#define FFT_SIZE_MIN 64 #define FFT_SIZE_MIN 64
#define FFT_SIZE_MAX 2048 #define FFT_SIZE_MAX 2048
@ -51,11 +52,12 @@
* functions sync_pss_det_absolute() and sync_pss_det_peakmean(). * functions sync_pss_det_absolute() and sync_pss_det_peakmean().
*/ */
typedef enum {SSS_DIFF=0, SSS_PARTIAL_3=2, SSS_FULL=1} sss_alg_t;
typedef struct LIBLTE_API { typedef struct LIBLTE_API {
pss_synch_t pss; pss_synch_t pss;
sss_synch_t sss; sss_synch_t sss;
float threshold; float threshold;
float mean_energy;
float peak_value; float peak_value;
float mean_peak_value; float mean_peak_value;
uint32_t N_id_2; uint32_t N_id_2;
@ -63,16 +65,20 @@ typedef struct LIBLTE_API {
uint32_t sf_idx; uint32_t sf_idx;
uint32_t fft_size; uint32_t fft_size;
uint32_t frame_size; uint32_t frame_size;
uint64_t frame_cnt; float mean_cfo;
float cfo; cfo_t cfocorr;
sss_alg_t sss_alg;
bool detect_cp; bool detect_cp;
bool sss_en; bool sss_en;
bool normalize_en; bool correct_cfo;
lte_cp_t cp; lte_cp_t cp;
uint32_t m0; uint32_t m0;
uint32_t m1; uint32_t m1;
float m0_value; float m0_value;
float m1_value; float m1_value;
float M_norm_avg;
float M_ext_avg;
}sync_t; }sync_t;
@ -90,6 +96,11 @@ LIBLTE_API int sync_find(sync_t *q,
uint32_t find_offset, uint32_t find_offset,
uint32_t *peak_position); uint32_t *peak_position);
/* Estimates the CP length */
LIBLTE_API lte_cp_t sync_detect_cp(sync_t *q,
cf_t *input,
uint32_t peak_pos);
/* Sets the threshold for peak comparison */ /* Sets the threshold for peak comparison */
LIBLTE_API void sync_set_threshold(sync_t *q, LIBLTE_API void sync_set_threshold(sync_t *q,
float threshold); float threshold);
@ -103,12 +114,17 @@ LIBLTE_API float sync_get_last_peak_value(sync_t *q);
/* Gets the mean peak value */ /* Gets the mean peak value */
LIBLTE_API float sync_get_peak_value(sync_t *q); LIBLTE_API float sync_get_peak_value(sync_t *q);
/* Gets the last input signal energy estimation value */ /* Choose SSS detection algorithm */
LIBLTE_API float sync_get_input_energy(sync_t *q); LIBLTE_API void sync_set_sss_algorithm(sync_t *q,
sss_alg_t alg);
/* Sets PSS exponential averaging alpha weight */
LIBLTE_API void sync_set_em_alpha(sync_t *q,
float alpha);
/* Sets the N_id_2 to search for */ /* Sets the N_id_2 to search for */
LIBLTE_API int sync_set_N_id_2(sync_t *q, LIBLTE_API int sync_set_N_id_2(sync_t *q,
uint32_t N_id_2); uint32_t N_id_2);
/* Gets the Physical CellId from the last call to synch_run() */ /* Gets the Physical CellId from the last call to synch_run() */
LIBLTE_API int sync_get_cell_id(sync_t *q); LIBLTE_API int sync_get_cell_id(sync_t *q);
@ -122,19 +138,20 @@ LIBLTE_API lte_cp_t sync_get_cp(sync_t *q);
/* Sets the CP length estimation (must do it if disabled) */ /* Sets the CP length estimation (must do it if disabled) */
LIBLTE_API void sync_set_cp(sync_t *q, lte_cp_t cp); LIBLTE_API void sync_set_cp(sync_t *q, lte_cp_t cp);
/* Enables/Disables energy normalization every frame. If disabled, uses the mean */
LIBLTE_API void sync_normalize_en(sync_t *q,
bool enable);
/* Enables/Disables SSS detection */ /* Enables/Disables SSS detection */
LIBLTE_API void sync_sss_en(sync_t *q, LIBLTE_API void sync_sss_en(sync_t *q,
bool enabled); bool enabled);
LIBLTE_API bool sync_sss_detected(sync_t *q); LIBLTE_API bool sync_sss_detected(sync_t *q);
LIBLTE_API bool sync_sss_is_en(sync_t *q);
/* Enables/Disables CP detection */ /* Enables/Disables CP detection */
LIBLTE_API void sync_cp_en(sync_t *q, LIBLTE_API void sync_cp_en(sync_t *q,
bool enabled); bool enabled);
LIBLTE_API void sync_correct_cfo(sync_t *q,
bool enabled);
#endif // SYNC_ #endif // SYNC_

20
lte/phy/include/liblte/phy/ue/ue_celldetect.h
Unescape Escape View File

@ -63,26 +63,28 @@
#define CS_DEFAULT_NOFFRAMES_TOTAL 100 #define CS_DEFAULT_NOFFRAMES_TOTAL 100
#define CS_DEFAULT_NOFFRAMES_DETECTED 10 #define CS_DEFAULT_NOFFRAMES_DETECTED 10
#define CS_FIND_THRESHOLD 0.6
#define CS_FRAME_UNALIGNED -3 #define CS_FRAME_UNALIGNED -3
#define CS_CELL_DETECTED 2 #define CS_CELL_DETECTED 2
#define CS_CELL_NOT_DETECTED 3 #define CS_CELL_NOT_DETECTED 3
#define CS_FFTSIZE 128
#define CS_SAMP_FREQ (960000*(CS_FFTSIZE/64))
#define CS_FLEN (4800*(CS_FFTSIZE/64))
typedef struct LIBLTE_API { typedef struct LIBLTE_API {
uint32_t cell_id; uint32_t cell_id;
lte_cp_t cp; lte_cp_t cp;
float peak; float peak;
uint32_t mode; float mode;
} ue_celldetect_result_t; } ue_celldetect_result_t;
typedef struct LIBLTE_API { typedef struct LIBLTE_API {
sync_t sfind; sync_t sfind;
uint32_t max_frames_total; uint32_t max_frames_total;
uint32_t max_frames_detected; uint32_t nof_frames_total; // number of 5 ms frames to scan
uint32_t nof_frames_total; float detect_threshold; // early-stops scan if mean PSR above this threshold
uint32_t nof_frames_detected;
uint32_t current_nof_detected; uint32_t current_nof_detected;
uint32_t current_nof_total; uint32_t current_nof_total;
@ -97,8 +99,7 @@ typedef struct LIBLTE_API {
LIBLTE_API int ue_celldetect_init(ue_celldetect_t *q); LIBLTE_API int ue_celldetect_init(ue_celldetect_t *q);
LIBLTE_API int ue_celldetect_init_max(ue_celldetect_t *q, LIBLTE_API int ue_celldetect_init_max(ue_celldetect_t *q,
uint32_t max_frames_total, uint32_t max_frames_total);
uint32_t max_frames_detected);
LIBLTE_API void ue_celldetect_free(ue_celldetect_t *q); LIBLTE_API void ue_celldetect_free(ue_celldetect_t *q);
@ -117,9 +118,6 @@ LIBLTE_API void ue_celldetect_get_cell(ue_celldetect_t * q,
LIBLTE_API int ue_celldetect_set_nof_frames_total(ue_celldetect_t *q, LIBLTE_API int ue_celldetect_set_nof_frames_total(ue_celldetect_t *q,
uint32_t nof_frames); uint32_t nof_frames);
LIBLTE_API int ue_celldetect_set_nof_frames_detected(ue_celldetect_t *q,
uint32_t nof_frames);
LIBLTE_API void ue_celldetect_set_threshold(ue_celldetect_t *q, LIBLTE_API void ue_celldetect_set_threshold(ue_celldetect_t *q,
float threshold); float threshold);

22
lte/phy/include/liblte/phy/ue/ue_dl.h
Unescape Escape View File

@ -76,6 +76,7 @@ typedef struct LIBLTE_API {
uint64_t nof_pdcch_detected; uint64_t nof_pdcch_detected;
uint16_t user_rnti; uint16_t user_rnti;
uint16_t current_rnti;
}ue_dl_t; }ue_dl_t;
/* This function shall be called just after the initial synchronization */ /* This function shall be called just after the initial synchronization */
@ -85,11 +86,20 @@ LIBLTE_API int ue_dl_init(ue_dl_t *q,
LIBLTE_API void ue_dl_free(ue_dl_t *q); LIBLTE_API void ue_dl_free(ue_dl_t *q);
LIBLTE_API int ue_dl_decode(ue_dl_t *q, LIBLTE_API int ue_dl_decode(ue_dl_t * q,
cf_t *sf_buffer, cf_t *input,
uint8_t *data, uint8_t *data,
uint32_t sf_idx, uint32_t sf_idx);
uint32_t sfn,
uint16_t rnti); LIBLTE_API int ue_dl_decode_sib(ue_dl_t * q,
cf_t *input,
uint8_t * data,
uint32_t sf_idx,
uint32_t rvidx);
LIBLTE_API void ue_dl_reset(ue_dl_t *q);
LIBLTE_API void ue_dl_set_rnti(ue_dl_t *q,
uint16_t rnti);
#endif #endif

5
lte/phy/include/liblte/phy/ue/ue_sync.h
Unescape Escape View File

@ -76,10 +76,7 @@ typedef struct LIBLTE_API {
lte_cell_t cell; lte_cell_t cell;
uint32_t sf_idx; uint32_t sf_idx;
cfo_t cfocorr;
float cur_cfo;
bool decode_sss_on_track; bool decode_sss_on_track;
uint32_t peak_idx; uint32_t peak_idx;

3
lte/phy/include/liblte/phy/utils/vector.h
Unescape Escape View File

@ -35,6 +35,9 @@
typedef _Complex float cf_t; typedef _Complex float cf_t;
#define MAX(a,b) ((a)>(b)?(a):(b))
// Cumulative moving average // Cumulative moving average
#define VEC_CMA(data, average, n) ((average) + ((data) - (average)) / ((n)+1)) #define VEC_CMA(data, average, n) ((average) + ((data) - (average)) / ((n)+1))

8
lte/phy/lib/phch/src/pbch.c
Unescape Escape View File

@ -278,7 +278,7 @@ int pbch_decode_frame(pbch_t *q, uint32_t src, uint32_t dst, uint32_t n,
uint32_t nof_bits, uint32_t nof_ports) { uint32_t nof_bits, uint32_t nof_ports) {
int j; int j;
INFO("Trying to decode PBCH %d bits, %d ports, src: %d, dst: %d, n=%d\n", nof_bits, nof_ports, src, dst, n); DEBUG("Trying to decode PBCH %d bits, %d ports, src: %d, dst: %d, n=%d\n", nof_bits, nof_ports, src, dst, n);
memcpy(&q->temp[dst * nof_bits], &q->pbch_llr[src * nof_bits], memcpy(&q->temp[dst * nof_bits], &q->pbch_llr[src * nof_bits],
n * nof_bits * sizeof(float)); n * nof_bits * sizeof(float));
@ -381,7 +381,11 @@ int pbch_decode(pbch_t *q, cf_t *slot1_symbols, cf_t *ce_slot1[MAX_PORTS], float
demod_soft_sigma_set(&q->demod, 1.0); demod_soft_sigma_set(&q->demod, 1.0);
demod_soft_demodulate(&q->demod, q->pbch_d, demod_soft_demodulate(&q->demod, q->pbch_d,
&q->pbch_llr[nof_bits * (q->frame_idx - 1)], q->nof_symbols); &q->pbch_llr[nof_bits * (q->frame_idx - 1)], q->nof_symbols);
if (nant == 2) {
vec_save_file("d",q->pbch_d, q->nof_symbols*sizeof(cf_t));
}
/* We don't know where the 40 ms begin, so we try all combinations. E.g. if we received /* We don't know where the 40 ms begin, so we try all combinations. E.g. if we received
* 4 frames, try 1,2,3,4 individually, 12, 23, 34 in pairs, 123, 234 and finally 1234. * 4 frames, try 1,2,3,4 individually, 12, 23, 34 in pairs, 123, 234 and finally 1234.
* We know they are ordered. * We know they are ordered.

25
lte/phy/lib/phch/src/pdsch.c
Unescape Escape View File

@ -399,12 +399,12 @@ int pdsch_harq_init(pdsch_harq_t *p, pdsch_t *pdsch) {
// FIXME: Use HARQ buffer limitation based on UE category // FIXME: Use HARQ buffer limitation based on UE category
p->w_buff_size = p->cell.nof_prb * MAX_PDSCH_RE(p->cell.cp) * 6 * 2 / p->max_cb; p->w_buff_size = p->cell.nof_prb * MAX_PDSCH_RE(p->cell.cp) * 6 * 2 / p->max_cb;
for (i=0;i<p->max_cb;i++) { for (i=0;i<p->max_cb;i++) {
p->pdsch_w_buff_f[i] = malloc(sizeof(float) * p->w_buff_size); p->pdsch_w_buff_f[i] = vec_malloc(sizeof(float) * p->w_buff_size);
if (!p->pdsch_w_buff_f[i]) { if (!p->pdsch_w_buff_f[i]) {
perror("malloc"); perror("malloc");
return LIBLTE_ERROR; return LIBLTE_ERROR;
} }
p->pdsch_w_buff_c[i] = malloc(sizeof(uint8_t) * p->w_buff_size); p->pdsch_w_buff_c[i] = vec_malloc(sizeof(uint8_t) * p->w_buff_size);
if (!p->pdsch_w_buff_c[i]) { if (!p->pdsch_w_buff_c[i]) {
perror("malloc"); perror("malloc");
return LIBLTE_ERROR; return LIBLTE_ERROR;
@ -439,6 +439,27 @@ void pdsch_harq_free(pdsch_harq_t *p) {
} }
} }
void pdsch_harq_reset(pdsch_harq_t *p) {
int i;
if (p->pdsch_w_buff_f) {
for (i=0;i<p->max_cb;i++) {
if (p->pdsch_w_buff_f[i]) {
bzero(p->pdsch_w_buff_f[i], sizeof(float) * p->w_buff_size);
}
}
}
if (p->pdsch_w_buff_c) {
for (i=0;i<p->max_cb;i++) {
if (p->pdsch_w_buff_c[i]) {
bzero(p->pdsch_w_buff_c[i], sizeof(uint8_t) * p->w_buff_size);
}
}
}
bzero(&p->mcs, sizeof(ra_mcs_t));
bzero(&p->cb_segm, sizeof(struct cb_segm));
bzero(&p->prb_alloc, sizeof(ra_prb_t));
}
int pdsch_harq_setup(pdsch_harq_t *p, ra_mcs_t mcs, ra_prb_t *prb_alloc) { int pdsch_harq_setup(pdsch_harq_t *p, ra_mcs_t mcs, ra_prb_t *prb_alloc) {
int ret = LIBLTE_ERROR_INVALID_INPUTS; int ret = LIBLTE_ERROR_INVALID_INPUTS;

8
lte/phy/lib/sync/src/find_sss.c
Unescape Escape View File

@ -72,8 +72,7 @@ static void corr_all_sz_partial(cf_t z[N_SSS], float s[N_SSS][N_SSS], uint32_t M
static void extract_pair_sss(sss_synch_t *q, cf_t *input, cf_t *ce, cf_t y[2][N_SSS]) { static void extract_pair_sss(sss_synch_t *q, cf_t *input, cf_t *ce, cf_t y[2][N_SSS]) {
cf_t input_fft[SYMBOL_SZ_MAX]; cf_t input_fft[SYMBOL_SZ_MAX];
dft_run_c(&q->dftp_input, input, input_fft);
dft_run_c(&q->dftp_input, &input[CP_NORM(5, q->fft_size)], input_fft);
if (ce) { if (ce) {
vec_prod_conj_ccc(&input_fft[q->fft_size/2-N_SSS], ce, &input_fft[q->fft_size/2-N_SSS], 2*N_SSS); vec_prod_conj_ccc(&input_fft[q->fft_size/2-N_SSS], ce, &input_fft[q->fft_size/2-N_SSS], 2*N_SSS);
@ -90,7 +89,8 @@ static void extract_pair_sss(sss_synch_t *q, cf_t *input, cf_t *ce, cf_t y[2][N_
} }
int sss_synch_m0m1_diff(sss_synch_t *q, cf_t *input, uint32_t *m0, float *m0_value, int sss_synch_m0m1_diff(sss_synch_t *q, cf_t *input, uint32_t *m0, float *m0_value,
uint32_t *m1, float *m1_value) { uint32_t *m1, float *m1_value)
{
return sss_synch_m0m1_diff_coh(q, input, NULL, m0, m0_value, m1, m1_value); return sss_synch_m0m1_diff_coh(q, input, NULL, m0, m0_value, m1, m1_value);
} }
@ -161,7 +161,7 @@ int sss_synch_m0m1_partial(sss_synch_t *q, cf_t *input, uint32_t M, cf_t ce[2*N_
extract_pair_sss(q, input, ce, y); extract_pair_sss(q, input, ce, y);
corr_all_sz_partial(y[0], q->fc_tables[q->N_id_2].s, M, q->corr_output_m0); corr_all_sz_partial(y[0], q->fc_tables[q->N_id_2].s, M, q->corr_output_m0);
*m0 = vec_max_fi(q->corr_output_m0, N_SSS); *m0 = vec_max_fi(q->corr_output_m0, N_SSS);
if (m0_value) { if (m0_value) {
*m0_value = q->corr_output_m0[*m0]; *m0_value = q->corr_output_m0[*m0];

60
lte/phy/lib/sync/src/pss.c
Unescape Escape View File

@ -67,7 +67,7 @@ int pss_synch_init_N_id_2(cf_t *pss_signal_time, cf_t *pss_signal_freq, uint32_t
vec_sc_prod_cfc(pss_signal_freq, 1.0/PSS_LEN, pss_signal_freq, fft_size); vec_sc_prod_cfc(pss_signal_freq, 1.0/PSS_LEN, pss_signal_freq, fft_size);
dft_plan_free(&plan); dft_plan_free(&plan);
ret = LIBLTE_SUCCESS; ret = LIBLTE_SUCCESS;
} }
return ret; return ret;
@ -95,7 +95,8 @@ int pss_synch_init_fft(pss_synch_t *q, uint32_t frame_size, uint32_t fft_size) {
q->N_id_2 = 10; q->N_id_2 = 10;
q->fft_size = fft_size; q->fft_size = fft_size;
q->frame_size = frame_size; q->frame_size = frame_size;
q->ema_alpha = 0.1;
buffer_size = fft_size + frame_size + 1; buffer_size = fft_size + frame_size + 1;
@ -105,6 +106,7 @@ int pss_synch_init_fft(pss_synch_t *q, uint32_t frame_size, uint32_t fft_size) {
} }
dft_plan_set_mirror(&q->dftp_input, true); dft_plan_set_mirror(&q->dftp_input, true);
dft_plan_set_dc(&q->dftp_input, true); dft_plan_set_dc(&q->dftp_input, true);
dft_plan_set_norm(&q->dftp_input, true);
q->tmp_input = vec_malloc(buffer_size * sizeof(cf_t)); q->tmp_input = vec_malloc(buffer_size * sizeof(cf_t));
if (!q->tmp_input) { if (!q->tmp_input) {
@ -183,11 +185,9 @@ void pss_synch_free(pss_synch_t *q) {
if (q->conv_output) { if (q->conv_output) {
free(q->conv_output); free(q->conv_output);
} }
#ifdef PSS_ACCUMULATE_ABS
if (q->conv_output_abs) { if (q->conv_output_abs) {
free(q->conv_output_abs); free(q->conv_output_abs);
} }
#endif
if (q->conv_output_avg) { if (q->conv_output_avg) {
free(q->conv_output_avg); free(q->conv_output_avg);
} }
@ -197,11 +197,8 @@ void pss_synch_free(pss_synch_t *q) {
} }
void pss_synch_reset(pss_synch_t *q) { void pss_synch_reset(pss_synch_t *q) {
#ifdef PSS_ACCUMULATE_ABS
uint32_t buffer_size = q->fft_size + q->frame_size + 1; uint32_t buffer_size = q->fft_size + q->frame_size + 1;
bzero(q->conv_output_avg, sizeof(cf_t) * buffer_size); bzero(q->conv_output_avg, sizeof(float) * buffer_size);
#endif
} }
/** /**
@ -261,6 +258,12 @@ int pss_synch_set_N_id_2(pss_synch_t *q, uint32_t N_id_2) {
} }
} }
/* Sets the weight factor alpha for the exponential moving average of the PSS correlation output
*/
void pss_synch_set_ema_alpha(pss_synch_t *q, float alpha) {
q->ema_alpha = alpha;
}
/** Performs time-domain PSS correlation. /** Performs time-domain PSS correlation.
* Returns the index of the PSS correlation peak in a subframe. * Returns the index of the PSS correlation peak in a subframe.
* The frame starts at corr_peak_pos-subframe_size/2. * The frame starts at corr_peak_pos-subframe_size/2.
@ -295,40 +298,39 @@ int pss_synch_find_pss(pss_synch_t *q, cf_t *input, float *corr_peak_value)
#endif #endif
#ifdef PSS_ACCUMULATE_ABS
#ifdef PSS_ABS_SQUARE #ifdef PSS_ABS_SQUARE
vec_abs_square_cf(q->conv_output, q->conv_output_abs, conv_output_len-1); vec_abs_square_cf(q->conv_output, q->conv_output_abs, conv_output_len-1);
#else #else
vec_abs_cf(q->conv_output, q->conv_output_abs, conv_output_len-1); vec_abs_cf(q->conv_output, q->conv_output_abs, conv_output_len-1);
#endif #endif
/* Find maximum of the absolute value of the correlation */
corr_peak_pos = vec_max_fi(q->conv_output_abs, conv_output_len-1);
// Normalize correlation output
vec_sc_prod_fff(q->conv_output_abs, 1/q->conv_output_abs[corr_peak_pos], q->conv_output_abs, conv_output_len-1);
vec_sum_fff(q->conv_output_abs, q->conv_output_avg, q->conv_output_avg, conv_output_len-1);
#else
#ifdef PSS_ABS_SQUARE vec_sc_prod_fff(q->conv_output_abs, q->ema_alpha, q->conv_output_abs, conv_output_len-1);
vec_abs_square_cf(q->conv_output, q->conv_output_avg, conv_output_len-1); vec_sc_prod_fff(q->conv_output_avg, 1-q->ema_alpha, q->conv_output_avg, conv_output_len-1);
#else
vec_abs_cf(q->conv_output, q->conv_output_avg, conv_output_len-1);
#endif
#endif vec_sum_fff(q->conv_output_abs, q->conv_output_avg, q->conv_output_avg, conv_output_len-1);
/* Find maximum of the absolute value of the correlation */ /* Find maximum of the absolute value of the correlation */
corr_peak_pos = vec_max_fi(q->conv_output_avg, conv_output_len-1); corr_peak_pos = vec_max_fi(q->conv_output_avg, conv_output_len-1);
#ifdef PSS_RETURN_PSR #ifdef PSS_RETURN_PSR
// Find second side lobe // Find second side lobe
float tmp = q->conv_output_avg[corr_peak_pos];
q->conv_output_avg[corr_peak_pos] = 0; // Find end of peak lobe to the right
int side_lobe_pos = vec_max_fi(q->conv_output_avg, conv_output_len-1); int pl_ub = corr_peak_pos+1;
q->conv_output_avg[corr_peak_pos] = tmp; while(q->conv_output_avg[pl_ub+1] <= q->conv_output_avg[pl_ub] && pl_ub < conv_output_len) {
pl_ub ++;
}
// Find end of peak lobe to the left
int pl_lb = corr_peak_pos-1;
while(q->conv_output_avg[pl_lb-1] <= q->conv_output_avg[pl_lb] && pl_lb > 1) {
pl_lb --;
}
int sl_right = pl_ub+vec_max_fi(&q->conv_output_avg[pl_ub], conv_output_len-1 - pl_ub);
int sl_left = vec_max_fi(q->conv_output_avg, pl_lb);
float side_lobe_value = MAX(q->conv_output_avg[sl_right], q->conv_output_avg[sl_left]);
if (corr_peak_value) { if (corr_peak_value) {
*corr_peak_value = tmp/q->conv_output_avg[side_lobe_pos]; *corr_peak_value = q->conv_output_avg[corr_peak_pos]/side_lobe_value;
} }
#else #else
if (corr_peak_value) { if (corr_peak_value) {
@ -366,7 +368,7 @@ int pss_synch_chest(pss_synch_t *q, cf_t *input, cf_t ce[PSS_LEN]) {
dft_run_c(&q->dftp_input, input, input_fft); dft_run_c(&q->dftp_input, input, input_fft);
/* Compute channel estimate taking the PSS sequence as reference */ /* Compute channel estimate taking the PSS sequence as reference */
vec_prod_conj_ccc(q->pss_signal_time[q->N_id_2], &input_fft[(q->fft_size-PSS_LEN)/2], ce, PSS_LEN); vec_prod_conj_ccc(&input_fft[(q->fft_size-PSS_LEN)/2], q->pss_signal_time[q->N_id_2], ce, PSS_LEN);
ret = LIBLTE_SUCCESS; ret = LIBLTE_SUCCESS;
} }

173
lte/phy/lib/sync/src/sync.c
Unescape Escape View File

@ -33,10 +33,11 @@
#include "liblte/phy/common/phy_common.h" #include "liblte/phy/common/phy_common.h"
#include "liblte/phy/sync/sync.h" #include "liblte/phy/sync/sync.h"
#include "liblte/phy/utils/vector.h" #include "liblte/phy/utils/vector.h"
#include "liblte/phy/sync/cfo.h"
#define MEANENERGY_EMA_ALPHA 0.5
#define MEANPEAK_EMA_ALPHA 0.2 #define MEANPEAK_EMA_ALPHA 0.2
#define CFO_EMA_ALPHA 0.01
#define CP_EMA_ALPHA 0.2
static bool fft_size_isvalid(uint32_t fft_size) { static bool fft_size_isvalid(uint32_t fft_size) {
if (fft_size >= FFT_SIZE_MIN && fft_size <= FFT_SIZE_MAX && (fft_size%64) == 0) { if (fft_size >= FFT_SIZE_MIN && fft_size <= FFT_SIZE_MAX && (fft_size%64) == 0) {
@ -55,24 +56,31 @@ int sync_init(sync_t *q, uint32_t frame_size, uint32_t fft_size) {
frame_size <= 307200 && frame_size <= 307200 &&
fft_size_isvalid(fft_size)) fft_size_isvalid(fft_size))
{ {
ret = LIBLTE_ERROR;
bzero(q, sizeof(sync_t)); bzero(q, sizeof(sync_t));
q->detect_cp = true; q->detect_cp = true;
q->normalize_en = true;
q->mean_energy = 0.0;
q->mean_peak_value = 0.0; q->mean_peak_value = 0.0;
q->sss_en = true; q->sss_en = true;
q->correct_cfo = true;
q->N_id_2 = 1000; q->N_id_2 = 1000;
q->N_id_1 = 1000; q->N_id_1 = 1000;
q->fft_size = fft_size; q->fft_size = fft_size;
q->frame_size = frame_size; q->frame_size = frame_size;
q->sss_alg = SSS_PARTIAL_3;
if (pss_synch_init_fft(&q->pss, frame_size, fft_size)) { if (pss_synch_init_fft(&q->pss, frame_size, fft_size)) {
fprintf(stderr, "Error initializing PSS object\n"); fprintf(stderr, "Error initializing PSS object\n");
return LIBLTE_ERROR; goto clean_exit;
} }
if (sss_synch_init(&q->sss, fft_size)) { if (sss_synch_init(&q->sss, fft_size)) {
fprintf(stderr, "Error initializing SSS object\n"); fprintf(stderr, "Error initializing SSS object\n");
return LIBLTE_ERROR; goto clean_exit;
}
if (cfo_init(&q->cfocorr, frame_size)) {
fprintf(stderr, "Error initiating CFO\n");
goto clean_exit;
} }
DEBUG("SYNC init with frame_size=%d and fft_size=%d\n", frame_size, fft_size); DEBUG("SYNC init with frame_size=%d and fft_size=%d\n", frame_size, fft_size);
@ -81,6 +89,11 @@ int sync_init(sync_t *q, uint32_t frame_size, uint32_t fft_size) {
} else { } else {
fprintf(stderr, "Invalid parameters frame_size: %d, fft_size: %d\n", frame_size, fft_size); fprintf(stderr, "Invalid parameters frame_size: %d, fft_size: %d\n", frame_size, fft_size);
} }
clean_exit:
if (ret == LIBLTE_ERROR) {
sync_free(q);
}
return ret; return ret;
} }
@ -88,6 +101,7 @@ void sync_free(sync_t *q) {
if (q) { if (q) {
pss_synch_free(&q->pss); pss_synch_free(&q->pss);
sss_synch_free(&q->sss); sss_synch_free(&q->sss);
cfo_free(&q->cfocorr);
} }
} }
@ -99,10 +113,6 @@ void sync_sss_en(sync_t *q, bool enabled) {
q->sss_en = enabled; q->sss_en = enabled;
} }
void sync_normalize_en(sync_t *q, bool enable) {
q->normalize_en = enable;
}
bool sync_sss_detected(sync_t *q) { bool sync_sss_detected(sync_t *q) {
return lte_N_id_1_isvalid(q->N_id_1); return lte_N_id_1_isvalid(q->N_id_1);
} }
@ -131,7 +141,7 @@ uint32_t sync_get_sf_idx(sync_t *q) {
} }
float sync_get_cfo(sync_t *q) { float sync_get_cfo(sync_t *q) {
return q->cfo; return q->mean_cfo;
} }
float sync_get_last_peak_value(sync_t *q) { float sync_get_last_peak_value(sync_t *q) {
@ -142,10 +152,22 @@ float sync_get_peak_value(sync_t *q) {
return q->mean_peak_value; return q->mean_peak_value;
} }
void sync_correct_cfo(sync_t *q, bool enabled) {
q->correct_cfo = enabled;
}
void sync_cp_en(sync_t *q, bool enabled) { void sync_cp_en(sync_t *q, bool enabled) {
q->detect_cp = enabled; q->detect_cp = enabled;
} }
bool sync_sss_is_en(sync_t *q) {
return q->sss_en;
}
void sync_set_em_alpha(sync_t *q, float alpha) {
pss_synch_set_ema_alpha(&q->pss, alpha);
}
lte_cp_t sync_get_cp(sync_t *q) { lte_cp_t sync_get_cp(sync_t *q) {
return q->cp; return q->cp;
} }
@ -153,33 +175,46 @@ void sync_set_cp(sync_t *q, lte_cp_t cp) {
q->cp = cp; q->cp = cp;
} }
void sync_set_sss_algorithm(sync_t *q, sss_alg_t alg) {
q->sss_alg = alg;
}
/* CP detection algorithm taken from: /* CP detection algorithm taken from:
* "SSS Detection Method for Initial Cell Search in 3GPP LTE FDD/TDD Dual Mode Receiver" * "SSS Detection Method for Initial Cell Search in 3GPP LTE FDD/TDD Dual Mode Receiver"
* by Jung-In Kim et al. * by Jung-In Kim et al.
*/ */
static lte_cp_t detect_cp(sync_t *q, cf_t *input, uint32_t peak_pos) lte_cp_t sync_detect_cp(sync_t *q, cf_t *input, uint32_t peak_pos)
{ {
float R_norm, R_ext, C_norm, C_ext; float R_norm, R_ext, C_norm, C_ext;
float M_norm, M_ext; float M_norm=0, M_ext=0;
R_norm = crealf(vec_dot_prod_conj_ccc(&input[peak_pos-q->fft_size-CP_NORM(7, q->fft_size)], uint32_t cp_norm_len = CP_NORM(7, q->fft_size);
&input[peak_pos-CP_NORM(7, q->fft_size)], uint32_t cp_ext_len = CP_EXT(q->fft_size);
CP_NORM(7, q->fft_size)));
C_norm = cabsf(vec_dot_prod_conj_ccc(&input[peak_pos-q->fft_size-CP_NORM(7, q->fft_size)], cf_t *input_cp_norm = &input[peak_pos-2*(q->fft_size+cp_norm_len)];
&input[peak_pos-q->fft_size-CP_NORM(7, q->fft_size)], cf_t *input_cp_ext = &input[peak_pos-2*(q->fft_size+cp_ext_len)];
CP_NORM(7, q->fft_size)));
R_ext = crealf(vec_dot_prod_conj_ccc(&input[peak_pos-q->fft_size-CP_EXT(q->fft_size)], for (int i=0;i<2;i++) {
&input[peak_pos-CP_EXT(q->fft_size)], R_norm = crealf(vec_dot_prod_conj_ccc(&input_cp_norm[q->fft_size], input_cp_norm, cp_norm_len));
CP_EXT(q->fft_size))); C_norm = cp_norm_len * vec_avg_power_cf(input_cp_norm, cp_norm_len);
C_ext = cabsf(vec_dot_prod_conj_ccc(&input[peak_pos-q->fft_size-CP_EXT(q->fft_size)], input_cp_norm += q->fft_size+cp_norm_len;
&input[peak_pos-q->fft_size-CP_EXT(q->fft_size)], M_norm += R_norm/C_norm;
CP_EXT(q->fft_size))); }
M_norm = R_norm/C_norm;
M_ext = R_ext/C_ext; q->M_norm_avg = VEC_EMA(M_norm, q->M_norm_avg, CP_EMA_ALPHA);
if (M_norm > M_ext) { for (int i=0;i<2;i++) {
R_ext = crealf(vec_dot_prod_conj_ccc(&input_cp_ext[q->fft_size], input_cp_ext, cp_ext_len));
C_ext = cp_ext_len * vec_avg_power_cf(input_cp_ext, cp_ext_len);
input_cp_ext += q->fft_size+cp_ext_len;
M_ext += R_ext/C_ext;
}
q->M_ext_avg = VEC_EMA(M_ext, q->M_ext_avg, CP_EMA_ALPHA);
if (q->M_norm_avg > q->M_ext_avg) {
return CPNORM; return CPNORM;
} else if (M_norm < M_ext) { } else if (q->M_norm_avg < q->M_ext_avg) {
return CPEXT; return CPEXT;
} else { } else {
if (R_norm > R_ext) { if (R_norm > R_ext) {
@ -199,8 +234,8 @@ int sync_sss(sync_t *q, cf_t *input, uint32_t peak_pos) {
sss_synch_set_N_id_2(&q->sss, q->N_id_2); sss_synch_set_N_id_2(&q->sss, q->N_id_2);
if (q->detect_cp) { if (q->detect_cp) {
if (peak_pos >= q->fft_size + CP_EXT(q->fft_size)) { if (peak_pos >= 2*(q->fft_size + CP_EXT(q->fft_size))) {
q->cp = detect_cp(q, input, peak_pos); q->cp = sync_detect_cp(q, input, peak_pos);
} else { } else {
INFO("Not enough room to detect CP length. Peak position: %d\n", peak_pos); INFO("Not enough room to detect CP length. Peak position: %d\n", peak_pos);
return LIBLTE_ERROR; return LIBLTE_ERROR;
@ -208,13 +243,23 @@ int sync_sss(sync_t *q, cf_t *input, uint32_t peak_pos) {
} }
/* Make sure we have enough room to find SSS sequence */ /* Make sure we have enough room to find SSS sequence */
sss_idx = (int) peak_pos - 2*(q->fft_size + CP(q->fft_size, q->cp)); sss_idx = (int) peak_pos-2*q->fft_size-CP(q->fft_size, (CP_ISNORM(q->cp)?CPNORM_LEN:CPEXT_LEN));
if (sss_idx < 0) { if (sss_idx < 0) {
INFO("Not enough room to decode CP SSS (sss_idx=%d, peak_pos=%d)\n", sss_idx, peak_pos); INFO("Not enough room to decode CP SSS (sss_idx=%d, peak_pos=%d)\n", sss_idx, peak_pos);
return LIBLTE_ERROR; return LIBLTE_ERROR;
} }
sss_synch_m0m1_diff(&q->sss, &input[sss_idx], &q->m0, &q->m0_value, &q->m1, &q->m1_value); switch(q->sss_alg) {
case SSS_DIFF:
sss_synch_m0m1_diff(&q->sss, &input[sss_idx], &q->m0, &q->m0_value, &q->m1, &q->m1_value);
break;
case SSS_PARTIAL_3:
sss_synch_m0m1_partial(&q->sss, &input[sss_idx], 3, NULL, &q->m0, &q->m0_value, &q->m1, &q->m1_value);
break;
case SSS_FULL:
sss_synch_m0m1_partial(&q->sss, &input[sss_idx], 1, NULL, &q->m0, &q->m0_value, &q->m1, &q->m1_value);
break;
}
q->sf_idx = sss_synch_subframe(q->m0, q->m1); q->sf_idx = sss_synch_subframe(q->m0, q->m1);
ret = sss_synch_N_id_1(&q->sss, q->m0, q->m1); ret = sss_synch_N_id_1(&q->sss, q->m0, q->m1);
@ -242,8 +287,6 @@ int sync_find(sync_t *q, cf_t *input, uint32_t find_offset, uint32_t *peak_posit
int ret = LIBLTE_ERROR_INVALID_INPUTS; int ret = LIBLTE_ERROR_INVALID_INPUTS;
float peak_unnormalized=0, energy=1;
if (q != NULL && if (q != NULL &&
input != NULL && input != NULL &&
lte_N_id_2_isvalid(q->N_id_2) && lte_N_id_2_isvalid(q->N_id_2) &&
@ -259,33 +302,12 @@ int sync_find(sync_t *q, cf_t *input, uint32_t find_offset, uint32_t *peak_posit
pss_synch_set_N_id_2(&q->pss, q->N_id_2); pss_synch_set_N_id_2(&q->pss, q->N_id_2);
peak_pos = pss_synch_find_pss(&q->pss, &input[find_offset], &peak_unnormalized); peak_pos = pss_synch_find_pss(&q->pss, &input[find_offset], &q->peak_value);
if (peak_pos < 0) { if (peak_pos < 0) {
fprintf(stderr, "Error calling finding PSS sequence\n"); fprintf(stderr, "Error calling finding PSS sequence\n");
return LIBLTE_ERROR; return LIBLTE_ERROR;
} }
if (q->normalize_en &&
peak_pos + find_offset >= q->fft_size )
{
/* Compute the energy of the received PSS sequence to normalize */
energy = sqrtf(vec_avg_power_cf(&input[find_offset+peak_pos-q->fft_size], q->fft_size));
q->mean_energy = VEC_EMA(energy, q->mean_energy, MEANENERGY_EMA_ALPHA);
} else {
if (q->mean_energy == 0.0) {
energy = 1.0;
} else {
energy = q->mean_energy;
}
}
/* Normalize and compute mean peak value */
if (q->mean_energy) {
q->peak_value = peak_unnormalized/q->mean_energy;
} else {
q->peak_value = peak_unnormalized/energy;
}
q->mean_peak_value = VEC_EMA(q->peak_value, q->mean_peak_value, MEANPEAK_EMA_ALPHA); q->mean_peak_value = VEC_EMA(q->peak_value, q->mean_peak_value, MEANPEAK_EMA_ALPHA);
q->frame_cnt++;
if (peak_position) { if (peak_position) {
*peak_position = (uint32_t) peak_pos; *peak_position = (uint32_t) peak_pos;
@ -294,31 +316,39 @@ int sync_find(sync_t *q, cf_t *input, uint32_t find_offset, uint32_t *peak_posit
/* If peak is over threshold, compute CFO and SSS */ /* If peak is over threshold, compute CFO and SSS */
if (q->peak_value >= q->threshold) { if (q->peak_value >= q->threshold) {
// Set an invalid N_id_1 indicating SSS is yet to be detected // Make sure we have enough space to estimate CFO
q->N_id_1 = 1000; if (peak_pos + find_offset >= q->fft_size) {
float cfo = pss_synch_cfo_compute(&q->pss, &input[find_offset+peak_pos-q->fft_size]);
/* compute cumulative moving average CFO */
q->mean_cfo = VEC_EMA(cfo, q->mean_cfo, CFO_EMA_ALPHA);
} else {
INFO("No space for CFO computation. Frame starts at \n",peak_pos);
}
// Try to detect SSS // Try to detect SSS
if (q->sss_en) { if (q->sss_en) {
/* Correct CFO with the averaged CFO estimation */
if (q->mean_cfo && q->correct_cfo) {
cfo_correct(&q->cfocorr, input, input, -q->mean_cfo / q->fft_size);
}
// Set an invalid N_id_1 indicating SSS is yet to be detected
q->N_id_1 = 1000;
if (sync_sss(q, input, find_offset + peak_pos) < 0) { if (sync_sss(q, input, find_offset + peak_pos) < 0) {
INFO("No space for SSS processing. Frame starts at %d\n", peak_pos); INFO("No space for SSS processing. Frame starts at %d\n", peak_pos);
} }
} }
// Make sure we have enough space to estimate CFO
if (peak_pos + find_offset >= q->fft_size) {
q->cfo = pss_synch_cfo_compute(&q->pss, &input[find_offset+peak_pos-q->fft_size]);
} else {
INFO("No space for CFO computation. Frame starts at \n",peak_pos);
}
// Return 1 (peak detected) even if we couldn't estimate CFO and SSS // Return 1 (peak detected) even if we couldn't estimate CFO and SSS
ret = 1; ret = 1;
} else { } else {
ret = 0; ret = 0;
} }
INFO("SYNC ret=%d N_id_2=%d pos=%d peak=%.2f/%.2f=%.2f mean_energy=%.2f" INFO("SYNC ret=%d N_id_2=%d frame_size=%d pos=%d peak=%.2f threshold=%.2f sf_idx=%d, CFO=%.3f KHz\n",
"threshold=%.2f sf_idx=%d, CFO=%.3f KHz\n", ret, q->N_id_2, q->frame_size, peak_pos, q->peak_value, q->threshold, q->sf_idx, 15*q->mean_cfo);
ret, q->N_id_2, peak_pos, peak_unnormalized*1000,energy*1000,q->peak_value, q->mean_energy*1000,
q->threshold, q->sf_idx, 15*q->cfo);
} else if (lte_N_id_2_isvalid(q->N_id_2)) { } else if (lte_N_id_2_isvalid(q->N_id_2)) {
fprintf(stderr, "Must call sync_set_N_id_2() first!\n"); fprintf(stderr, "Must call sync_set_N_id_2() first!\n");
@ -328,6 +358,7 @@ int sync_find(sync_t *q, cf_t *input, uint32_t find_offset, uint32_t *peak_posit
} }
void sync_reset(sync_t *q) { void sync_reset(sync_t *q) {
q->frame_cnt = 0; q->M_ext_avg = 0;
q->M_norm_avg = 0;
pss_synch_reset(&q->pss); pss_synch_reset(&q->pss);
} }

55
lte/phy/lib/sync/test/pss_usrp.c
Unescape Escape View File

@ -53,12 +53,14 @@ float uhd_gain=40.0, uhd_freq=-1.0;
int nof_frames = -1; int nof_frames = -1;
uint32_t fft_size=64; uint32_t fft_size=64;
float threshold = 0.4; float threshold = 0.4;
int N_id_2_sync = -1;
void usage(char *prog) { void usage(char *prog) {
printf("Usage: %s [adgtvnp] -f rx_frequency_hz -i cell_id\n", prog); printf("Usage: %s [adgtvnp] -f rx_frequency_hz -i cell_id\n", prog);
printf("\t-a UHD args [Default %s]\n", uhd_args); printf("\t-a UHD args [Default %s]\n", uhd_args);
printf("\t-g UHD Gain [Default %.2f dB]\n", uhd_gain); printf("\t-g UHD Gain [Default %.2f dB]\n", uhd_gain);
printf("\t-n nof_frames [Default %d]\n", nof_frames); printf("\t-n nof_frames [Default %d]\n", nof_frames);
printf("\t-l N_id_2 to sync [Default use cell_id]\n");
printf("\t-s symbol_sz [Default %d]\n", fft_size); printf("\t-s symbol_sz [Default %d]\n", fft_size);
printf("\t-t threshold [Default %.2f]\n", threshold); printf("\t-t threshold [Default %.2f]\n", threshold);
#ifndef DISABLE_GRAPHICS #ifndef DISABLE_GRAPHICS
@ -71,7 +73,7 @@ void usage(char *prog) {
void parse_args(int argc, char **argv) { void parse_args(int argc, char **argv) {
int opt; int opt;
while ((opt = getopt(argc, argv, "adgtvsfi")) != -1) { while ((opt = getopt(argc, argv, "adgtvsfil")) != -1) {
switch (opt) { switch (opt) {
case 'a': case 'a':
uhd_args = argv[optind]; uhd_args = argv[optind];
@ -88,6 +90,9 @@ void parse_args(int argc, char **argv) {
case 'i': case 'i':
cell_id = atoi(argv[optind]); cell_id = atoi(argv[optind]);
break; break;
case 'l':
N_id_2_sync = atoi(argv[optind]);
break;
case 's': case 's':
fft_size = atoi(argv[optind]); fft_size = atoi(argv[optind]);
break; break;
@ -117,7 +122,7 @@ int main(int argc, char **argv) {
int frame_cnt, n; int frame_cnt, n;
void *uhd; void *uhd;
pss_synch_t pss; pss_synch_t pss;
cfo_t cfocorr; cfo_t cfocorr, cfocorr64;
sss_synch_t sss; sss_synch_t sss;
int32_t flen; int32_t flen;
int peak_idx, last_peak; int peak_idx, last_peak;
@ -128,6 +133,9 @@ int main(int argc, char **argv) {
parse_args(argc, argv); parse_args(argc, argv);
if (N_id_2_sync == -1) {
N_id_2_sync = cell_id%3;
}
uint32_t N_id_2 = cell_id%3; uint32_t N_id_2 = cell_id%3;
uint32_t N_id_1 = cell_id/3; uint32_t N_id_1 = cell_id/3;
@ -146,12 +154,13 @@ int main(int argc, char **argv) {
fprintf(stderr, "Error initiating PSS\n"); fprintf(stderr, "Error initiating PSS\n");
exit(-1); exit(-1);
} }
if (pss_synch_set_N_id_2(&pss, N_id_2)) { if (pss_synch_set_N_id_2(&pss, N_id_2_sync)) {
fprintf(stderr, "Error setting N_id_2=%d\n",N_id_2); fprintf(stderr, "Error setting N_id_2=%d\n",N_id_2_sync);
exit(-1); exit(-1);
} }
cfo_init(&cfocorr, flen); cfo_init(&cfocorr, flen);
cfo_init(&cfocorr64, flen);
if (sss_synch_init(&sss, fft_size)) { if (sss_synch_init(&sss, fft_size)) {
fprintf(stderr, "Error initializing SSS object\n"); fprintf(stderr, "Error initializing SSS object\n");
@ -184,6 +193,11 @@ int main(int argc, char **argv) {
float mean_cfo = 0; float mean_cfo = 0;
uint32_t m0, m1; uint32_t m0, m1;
uint32_t sss_error1 = 0, sss_error2 = 0, sss_error3 = 0; uint32_t sss_error1 = 0, sss_error2 = 0, sss_error3 = 0;
uint32_t cp_is_norm = 0;
sync_t ssync;
bzero(&ssync, sizeof(sync_t));
ssync.fft_size = fft_size;
while(frame_cnt < nof_frames || nof_frames == -1) { while(frame_cnt < nof_frames || nof_frames == -1) {
n = cuhd_recv(uhd, buffer, flen - peak_offset, 1); n = cuhd_recv(uhd, buffer, flen - peak_offset, 1);
@ -197,7 +211,7 @@ int main(int argc, char **argv) {
fprintf(stderr, "Error finding PSS peak\n"); fprintf(stderr, "Error finding PSS peak\n");
exit(-1); exit(-1);
} }
mean_peak = VEC_CMA(peak_value, mean_peak, frame_cnt); mean_peak = VEC_CMA(peak_value, mean_peak, frame_cnt);
if (peak_value >= threshold) { if (peak_value >= threshold) {
@ -219,22 +233,29 @@ int main(int argc, char **argv) {
} }
// Find SSS // Find SSS
int sss_idx = peak_idx-flen/10+SLOT_IDX_CPNORM(5,fft_size); int sss_idx = peak_idx-2*fft_size-CP(fft_size, CPNORM_LEN);
if (sss_idx >= 0 && sss_idx < flen-fft_size) { if (sss_idx >= 0 && sss_idx < flen-fft_size) {
sss_synch_m0m1_diff(&sss, &buffer[sss_idx], &m0, &m0_value, &m1, &m1_value);
if (sss_synch_N_id_1(&sss, m0, m1) != N_id_1) {
sss_error3++;
}
sss_synch_m0m1_partial(&sss, &buffer[sss_idx], 3, NULL, &m0, &m0_value, &m1, &m1_value); sss_synch_m0m1_partial(&sss, &buffer[sss_idx], 3, NULL, &m0, &m0_value, &m1, &m1_value);
if (sss_synch_N_id_1(&sss, m0, m1) != N_id_1) { if (sss_synch_N_id_1(&sss, m0, m1) != N_id_1) {
sss_error2++; sss_error2++;
} }
sss_synch_m0m1_diff(&sss, &buffer[sss_idx], &m0, &m0_value, &m1, &m1_value);
if (sss_synch_N_id_1(&sss, m0, m1) != N_id_1) {
sss_error3++;
}
sss_synch_m0m1_partial(&sss, &buffer[sss_idx], 1, NULL, &m0, &m0_value, &m1, &m1_value); sss_synch_m0m1_partial(&sss, &buffer[sss_idx], 1, NULL, &m0, &m0_value, &m1, &m1_value);
if (sss_synch_N_id_1(&sss, m0, m1) != N_id_1) { if (sss_synch_N_id_1(&sss, m0, m1) != N_id_1) {
sss_error1++; sss_error1++;
} }
} }
// Estimate CP
if (peak_idx > 2*(fft_size + CP_EXT(fft_size))) {
lte_cp_t cp = sync_detect_cp(&ssync, buffer, peak_idx);
if (CP_ISNORM(cp)) {
cp_is_norm++;
}
}
} else { } else {
INFO("No space for CFO computation. Frame starts at \n",peak_idx); INFO("No space for CFO computation. Frame starts at \n",peak_idx);
@ -248,7 +269,7 @@ int main(int argc, char **argv) {
} }
if (frame_cnt > 100) { if (frame_cnt > 100) {
if (abs(last_peak-peak_idx) > 10) { if (abs(last_peak-peak_idx) > 4) {
if (peak_value >= threshold) { if (peak_value >= threshold) {
nof_nopeakdet++; nof_nopeakdet++;
} }
@ -258,15 +279,15 @@ int main(int argc, char **argv) {
frame_cnt++; frame_cnt++;
printf("[%5d]: Pos: %5d, PSR: %6.3f MeanPSR: %6.3f, Pdet: %6.3f, Pmiss: %.3f, " printf("[%5d]: Pos: %5d, PSR: %4.1f (~%4.1f) Pdet: %4.2f, "
"FP: %d, FPThres: %d, CFO: %+4.1f KHz SSSmiss: %.3f/%.3f/%.3f\r", "FA: %4.2f, CFO: %+4.1f KHz SSSmiss: %4.2f/%4.2f/%4.2f CPNorm: %.0f\%\r",
frame_cnt, frame_cnt,
peak_idx, peak_idx,
peak_value, mean_peak, peak_value, mean_peak,
(float) nof_det/frame_cnt, (float) nof_nodet/frame_cnt, (float) nof_det/frame_cnt,
nof_nopeak, nof_nopeakdet, mean_cfo*15, (float) nof_nopeakdet/frame_cnt, mean_cfo*15,
(float) sss_error1/nof_det,(float) sss_error2/nof_det,(float) sss_error3/nof_det (float) sss_error1/nof_det,(float) sss_error2/nof_det,(float) sss_error3/nof_det,
); (float) cp_is_norm/nof_det * 100);
if (VERBOSE_ISINFO()) { if (VERBOSE_ISINFO()) {
printf("\n"); printf("\n");

84
lte/phy/lib/ue/src/ue_celldetect.c
Unescape Escape View File

@ -36,15 +36,15 @@
#include "liblte/phy/utils/debug.h" #include "liblte/phy/utils/debug.h"
#include "liblte/phy/utils/vector.h" #include "liblte/phy/utils/vector.h"
#define CS_CELL_DETECT_THRESHOLD 1.2
#define FIND_FFTSIZE 64 #define CS_SFLEN 5*SF_LEN(CS_FFTSIZE)
#define FIND_SFLEN 5*SF_LEN(FIND_FFTSIZE)
int ue_celldetect_init(ue_celldetect_t * q) { int ue_celldetect_init(ue_celldetect_t * q) {
return ue_celldetect_init_max(q, CS_DEFAULT_MAXFRAMES_TOTAL, CS_DEFAULT_MAXFRAMES_DETECTED); return ue_celldetect_init_max(q, CS_DEFAULT_MAXFRAMES_TOTAL);
} }
int ue_celldetect_init_max(ue_celldetect_t * q, uint32_t max_frames_total, uint32_t max_frames_detected) { int ue_celldetect_init_max(ue_celldetect_t * q, uint32_t max_frames_total) {
int ret = LIBLTE_ERROR_INVALID_INPUTS; int ret = LIBLTE_ERROR_INVALID_INPUTS;
if (q != NULL) { if (q != NULL) {
@ -52,32 +52,32 @@ int ue_celldetect_init_max(ue_celldetect_t * q, uint32_t max_frames_total, uint3
bzero(q, sizeof(ue_celldetect_t)); bzero(q, sizeof(ue_celldetect_t));
q->candidates = calloc(sizeof(ue_celldetect_result_t), max_frames_detected); q->candidates = calloc(sizeof(ue_celldetect_result_t), max_frames_total);
if (!q->candidates) { if (!q->candidates) {
perror("malloc"); perror("malloc");
goto clean_exit; goto clean_exit;
} }
if (sync_init(&q->sfind, FIND_SFLEN, FIND_FFTSIZE)) { if (sync_init(&q->sfind, CS_SFLEN, CS_FFTSIZE)) {
goto clean_exit; goto clean_exit;
} }
q->mode_ntimes = calloc(sizeof(uint32_t), max_frames_detected); q->mode_ntimes = calloc(sizeof(uint32_t), max_frames_total);
if (!q->mode_ntimes) { if (!q->mode_ntimes) {
perror("malloc"); perror("malloc");
goto clean_exit; goto clean_exit;
} }
q->mode_counted = calloc(sizeof(uint8_t), max_frames_detected); q->mode_counted = calloc(sizeof(uint8_t), max_frames_total);
if (!q->mode_counted) { if (!q->mode_counted) {
perror("malloc"); perror("malloc");
goto clean_exit; goto clean_exit;
} }
sync_set_threshold(&q->sfind, CS_FIND_THRESHOLD); /* Accept all peaks because search space is 5 ms and there is always a peak */
sync_set_threshold(&q->sfind, 1.0);
sync_sss_en(&q->sfind, true); sync_sss_en(&q->sfind, true);
sync_set_sss_algorithm(&q->sfind, SSS_PARTIAL_3);
q->max_frames_total = max_frames_total; q->max_frames_total = max_frames_total;
q->max_frames_detected = max_frames_detected;
q->nof_frames_total = CS_DEFAULT_NOFFRAMES_TOTAL; q->nof_frames_total = CS_DEFAULT_NOFFRAMES_TOTAL;
q->nof_frames_detected = CS_DEFAULT_NOFFRAMES_DETECTED;
ue_celldetect_reset(q); ue_celldetect_reset(q);
@ -108,7 +108,6 @@ void ue_celldetect_free(ue_celldetect_t * q)
} }
void ue_celldetect_reset(ue_celldetect_t * q) void ue_celldetect_reset(ue_celldetect_t * q)
{ {
q->current_nof_detected = 0; q->current_nof_detected = 0;
@ -117,7 +116,7 @@ void ue_celldetect_reset(ue_celldetect_t * q)
void ue_celldetect_set_threshold(ue_celldetect_t * q, float threshold) void ue_celldetect_set_threshold(ue_celldetect_t * q, float threshold)
{ {
sync_set_threshold(&q->sfind, threshold); q->detect_threshold = threshold;
} }
int ue_celldetect_set_nof_frames_total(ue_celldetect_t * q, uint32_t nof_frames) int ue_celldetect_set_nof_frames_total(ue_celldetect_t * q, uint32_t nof_frames)
@ -130,28 +129,22 @@ int ue_celldetect_set_nof_frames_total(ue_celldetect_t * q, uint32_t nof_frames)
} }
} }
int ue_celldetect_set_nof_frames_detected(ue_celldetect_t * q, uint32_t nof_frames)
{
if (nof_frames <= q->max_frames_detected) {
q->nof_frames_detected = nof_frames;
return LIBLTE_SUCCESS;
} else {
return LIBLTE_ERROR;
}
}
/* Decide the most likely cell based on the mode */ /* Decide the most likely cell based on the mode */
void ue_celldetect_get_cell(ue_celldetect_t * q, ue_celldetect_result_t *found_cell) void ue_celldetect_get_cell(ue_celldetect_t * q, ue_celldetect_result_t *found_cell)
{ {
uint32_t i, j; uint32_t i, j;
bzero(q->mode_counted, q->nof_frames_detected); if (!q->current_nof_detected) {
bzero(q->mode_ntimes, sizeof(uint32_t) * q->nof_frames_detected); return;
}
bzero(q->mode_counted, q->current_nof_detected);
bzero(q->mode_ntimes, sizeof(uint32_t) * q->current_nof_detected);
/* First find mode of CELL IDs */ /* First find mode of CELL IDs */
for (i = 0; i < q->nof_frames_detected; i++) { for (i = 0; i < q->current_nof_detected; i++) {
uint32_t cnt = 1; uint32_t cnt = 1;
for (j=i+1;j<q->nof_frames_detected;j++) { for (j=i+1;j<q->current_nof_detected;j++) {
if (q->candidates[j].cell_id == q->candidates[i].cell_id && !q->mode_counted[j]) { if (q->candidates[j].cell_id == q->candidates[i].cell_id && !q->mode_counted[j]) {
q->mode_counted[j]=1; q->mode_counted[j]=1;
cnt++; cnt++;
@ -160,7 +153,7 @@ void ue_celldetect_get_cell(ue_celldetect_t * q, ue_celldetect_result_t *found_c
q->mode_ntimes[i] = cnt; q->mode_ntimes[i] = cnt;
} }
uint32_t max_times=0, mode_pos=0; uint32_t max_times=0, mode_pos=0;
for (i=0;i<q->nof_frames_detected;i++) { for (i=0;i<q->current_nof_detected;i++) {
if (q->mode_ntimes[i] > max_times) { if (q->mode_ntimes[i] > max_times) {
max_times = q->mode_ntimes[i]; max_times = q->mode_ntimes[i];
mode_pos = i; mode_pos = i;
@ -169,15 +162,11 @@ void ue_celldetect_get_cell(ue_celldetect_t * q, ue_celldetect_result_t *found_c
found_cell->cell_id = q->candidates[mode_pos].cell_id; found_cell->cell_id = q->candidates[mode_pos].cell_id;
/* Now in all these cell IDs, find most frequent CP */ /* Now in all these cell IDs, find most frequent CP */
uint32_t nof_normal = 0; uint32_t nof_normal = 0;
found_cell->peak = 0; for (i=0;i<q->current_nof_detected;i++) {
for (i=0;i<q->nof_frames_detected;i++) {
if (q->candidates[i].cell_id == found_cell->cell_id) { if (q->candidates[i].cell_id == found_cell->cell_id) {
if (CP_ISNORM(q->candidates[i].cp)) { if (CP_ISNORM(q->candidates[i].cp)) {
nof_normal++; nof_normal++;
} }
if (q->mode_ntimes[mode_pos]) {
found_cell->peak += q->candidates[i].peak/q->mode_ntimes[mode_pos];
}
} }
} }
if (nof_normal > q->mode_ntimes[mode_pos]/2) { if (nof_normal > q->mode_ntimes[mode_pos]/2) {
@ -185,7 +174,8 @@ void ue_celldetect_get_cell(ue_celldetect_t * q, ue_celldetect_result_t *found_c
} else { } else {
found_cell->cp = CPEXT; found_cell->cp = CPEXT;
} }
found_cell->mode = q->mode_ntimes[mode_pos]; found_cell->mode = (float) q->mode_ntimes[mode_pos]/q->current_nof_detected;
found_cell->peak = q->candidates[q->current_nof_detected-1].peak;
q->current_nof_detected = q->current_nof_total = 0; q->current_nof_detected = q->current_nof_total = 0;
} }
@ -204,15 +194,15 @@ int ue_celldetect_scan(ue_celldetect_t * q,
if (q != NULL && if (q != NULL &&
signal != NULL && signal != NULL &&
nsamples >= 4800) nsamples >= CS_FLEN)
{ {
ret = LIBLTE_SUCCESS; ret = LIBLTE_SUCCESS;
if (nsamples % 4800) { if (nsamples % CS_FLEN) {
printf("Warning: nsamples must be a multiple of 4800. Some samples will be ignored\n"); printf("Warning: nsamples must be a multiple of %d. Some samples will be ignored\n", CS_FLEN);
nsamples = (nsamples/4800) * 4800; nsamples = (nsamples/CS_FLEN) * CS_FLEN;
} }
nof_input_frames = nsamples/4800; nof_input_frames = nsamples/CS_FLEN;
for (uint32_t nf=0;nf<nof_input_frames;nf++) { for (uint32_t nf=0;nf<nof_input_frames;nf++) {
@ -220,7 +210,7 @@ int ue_celldetect_scan(ue_celldetect_t * q,
q->current_nof_detected, q->current_nof_total, q->sfind.N_id_2, nof_input_frames); q->current_nof_detected, q->current_nof_total, q->sfind.N_id_2, nof_input_frames);
/* Find peak and cell id */ /* Find peak and cell id */
ret = sync_find(&q->sfind, &signal[nf*4800], 0, &peak_idx); ret = sync_find(&q->sfind, &signal[nf*CS_FLEN], 0, &peak_idx);
if (ret < 0) { if (ret < 0) {
fprintf(stderr, "Error finding correlation peak (%d)\n", ret); fprintf(stderr, "Error finding correlation peak (%d)\n", ret);
return LIBLTE_ERROR; return LIBLTE_ERROR;
@ -234,7 +224,7 @@ int ue_celldetect_scan(ue_celldetect_t * q,
/* Save cell id, cp and peak */ /* Save cell id, cp and peak */
q->candidates[q->current_nof_detected].cell_id = (uint32_t) ret; q->candidates[q->current_nof_detected].cell_id = (uint32_t) ret;
q->candidates[q->current_nof_detected].cp = sync_get_cp(&q->sfind); q->candidates[q->current_nof_detected].cp = sync_get_cp(&q->sfind);
q->candidates[q->current_nof_detected].peak = sync_get_last_peak_value(&q->sfind); q->candidates[q->current_nof_detected].peak = sync_get_peak_value(&q->sfind);
} }
INFO INFO
("[%3d/%3d]: Found peak at %4d, value %.3f, Cell_id: %d CP: %s\n", ("[%3d/%3d]: Found peak at %4d, value %.3f, Cell_id: %d CP: %s\n",
@ -250,11 +240,15 @@ int ue_celldetect_scan(ue_celldetect_t * q,
q->current_nof_total++; q->current_nof_total++;
/* Decide cell ID and CP if we detected up to nof_frames_detected */ /* Decide cell ID and CP if we detected up to nof_frames_detected */
if (q->current_nof_detected == q->nof_frames_detected) { if (sync_get_peak_value(&q->sfind) > q->detect_threshold) {
ret = CS_CELL_DETECTED; ret = CS_CELL_DETECTED;
} else if (q->current_nof_total == q->nof_frames_total) { } else if (q->current_nof_total == q->nof_frames_total) {
q->current_nof_detected = q->current_nof_total = 0; if (sync_get_peak_value(&q->sfind) > CS_CELL_DETECT_THRESHOLD) {
ret = CS_CELL_NOT_DETECTED; ret = CS_CELL_DETECTED;
} else {
ret = CS_CELL_NOT_DETECTED;
q->current_nof_detected = q->current_nof_total = 0;
}
} else { } else {
ret = 0; ret = 0;
} }

104
lte/phy/lib/ue/src/ue_dl.c
Unescape Escape View File

@ -144,6 +144,15 @@ void ue_dl_free(ue_dl_t *q) {
} }
} }
void ue_dl_set_rnti(ue_dl_t *q, uint16_t rnti) {
q->current_rnti = rnti;
pdsch_set_rnti(&q->pdsch, SIRNTI);
}
void ue_dl_reset(ue_dl_t *q) {
pdsch_harq_reset(&q->harq_process[0]);
}
LIBLTE_API float mean_exec_time=0; LIBLTE_API float mean_exec_time=0;
dci_format_t ue_formats[] = {Format1A,Format1}; // Format1B should go here also dci_format_t ue_formats[] = {Format1A,Format1}; // Format1B should go here also
@ -152,7 +161,18 @@ const uint32_t nof_ue_formats = 2;
dci_format_t common_formats[] = {Format1A,Format1C}; dci_format_t common_formats[] = {Format1A,Format1C};
const uint32_t nof_common_formats = 2; const uint32_t nof_common_formats = 2;
int ue_dl_decode(ue_dl_t *q, cf_t *input, uint8_t *data, uint32_t sf_idx, uint32_t sfn, uint16_t rnti) /** Applies the following operations to a subframe of synchronized samples:
* - OFDM demodulation
* - Channel estimation
* - PCFICH decoding
* - PDCCH decoding: Find DCI for RNTI given by previous call to ue_dl_set_rnti()
* - PDSCH decoding: Decode TB scrambling with RNTI given by ue_dl_set_rnti()
*/
int ue_dl_decode(ue_dl_t *q, cf_t *input, uint8_t *data, uint32_t sf_idx) {
return ue_dl_decode_sib(q, input, data, sf_idx, 0);
}
int ue_dl_decode_sib(ue_dl_t *q, cf_t *input, uint8_t *data, uint32_t sf_idx, uint32_t rvidx)
{ {
uint32_t cfi, cfi_distance, i; uint32_t cfi, cfi_distance, i;
ra_pdsch_t ra_dl; ra_pdsch_t ra_dl;
@ -173,8 +193,6 @@ int ue_dl_decode(ue_dl_t *q, cf_t *input, uint8_t *data, uint32_t sf_idx, uint32
/* Get channel estimates for each port */ /* Get channel estimates for each port */
chest_dl_estimate(&q->chest, q->sf_symbols, q->ce, sf_idx); chest_dl_estimate(&q->chest, q->sf_symbols, q->ce, sf_idx);
/* First decode PCFICH and obtain CFI */ /* First decode PCFICH and obtain CFI */
if (pcfich_decode(&q->pcfich, q->sf_symbols, q->ce, if (pcfich_decode(&q->pcfich, q->sf_symbols, q->ce,
chest_dl_get_noise_estimate(&q->chest), sf_idx, &cfi, &cfi_distance)<0) { chest_dl_get_noise_estimate(&q->chest), sf_idx, &cfi, &cfi_distance)<0) {
@ -190,12 +208,12 @@ int ue_dl_decode(ue_dl_t *q, cf_t *input, uint8_t *data, uint32_t sf_idx, uint32
} }
/* Generate PDCCH candidates */ /* Generate PDCCH candidates */
if (rnti == SIRNTI) { if (q->current_rnti == SIRNTI) {
nof_locations = pdcch_common_locations(&q->pdcch, locations, MAX_CANDIDATES, cfi); nof_locations = pdcch_common_locations(&q->pdcch, locations, MAX_CANDIDATES, cfi);
formats = common_formats; formats = common_formats;
nof_formats = nof_common_formats; nof_formats = nof_common_formats;
} else { } else {
nof_locations = pdcch_ue_locations(&q->pdcch, locations, MAX_CANDIDATES, sf_idx, cfi, q->user_rnti); nof_locations = pdcch_ue_locations(&q->pdcch, locations, MAX_CANDIDATES, sf_idx, cfi, q->current_rnti);
formats = ue_formats; formats = ue_formats;
nof_formats = nof_ue_formats; nof_formats = nof_ue_formats;
} }
@ -207,59 +225,59 @@ int ue_dl_decode(ue_dl_t *q, cf_t *input, uint8_t *data, uint32_t sf_idx, uint32
} }
/* For all possible locations, try to decode a DCI message */ /* For all possible locations, try to decode a DCI message */
crc_rem = 0; crc_rem = 0;
for (int f=0;f<nof_formats;f++) { uint32_t found_dci = 0;
for (i=0;i<nof_locations && crc_rem != rnti;i++) { for (int f=0;f<nof_formats && !found_dci;f++) {
for (i=0;i<nof_locations && !found_dci;i++) {
if (pdcch_decode_msg(&q->pdcch, &dci_msg, &locations[i], formats[f], &crc_rem)) { if (pdcch_decode_msg(&q->pdcch, &dci_msg, &locations[i], formats[f], &crc_rem)) {
fprintf(stderr, "Error decoding DCI msg\n"); fprintf(stderr, "Error decoding DCI msg\n");
return LIBLTE_ERROR; return LIBLTE_ERROR;
} }
INFO("Decoded DCI message RNTI: 0x%x\n", crc_rem); INFO("Decoded DCI message RNTI: 0x%x\n", crc_rem);
}
} if (crc_rem == q->current_rnti) {
found_dci++;
if (crc_rem == rnti) { q->nof_pdcch_detected++;
q->nof_pdcch_detected++; if (dci_msg_to_ra_dl(&dci_msg, q->current_rnti, q->user_rnti, q->cell, cfi, &ra_dl)) {
if (dci_msg_to_ra_dl(&dci_msg, rnti, q->user_rnti, q->cell, cfi, &ra_dl)) { fprintf(stderr, "Error unpacking PDSCH scheduling DCI message\n");
fprintf(stderr, "Error unpacking PDSCH scheduling DCI message\n"); return LIBLTE_ERROR;
return LIBLTE_ERROR; }
}
uint32_t rvidx; if (q->current_rnti != SIRNTI) {
if (rnti == SIRNTI) { rvidx = ra_dl.rv_idx;
int k = ((sfn)/2)%4; }
rvidx = ((int) ceilf((float)3*k/2))%4; if (rvidx == 0) {
} else { if (pdsch_harq_setup(&q->harq_process[0], ra_dl.mcs, &ra_dl.prb_alloc)) {
rvidx = ra_dl.rv_idx; fprintf(stderr, "Error configuring HARQ process\n");
} return LIBLTE_ERROR;
if (rvidx == 0) { }
if (pdsch_harq_setup(&q->harq_process[0], ra_dl.mcs, &ra_dl.prb_alloc)) { }
fprintf(stderr, "Error configuring HARQ process\n"); if (q->harq_process[0].mcs.mod > 0) {
return LIBLTE_ERROR; ret = pdsch_decode(&q->pdsch, q->sf_symbols, q->ce, chest_dl_get_noise_estimate(&q->chest), data, sf_idx,
} &q->harq_process[0], rvidx);
} if (ret == LIBLTE_ERROR) {
if (q->harq_process[0].mcs.mod > 0) { q->pkt_errors++;
ret = pdsch_decode(&q->pdsch, q->sf_symbols, q->ce, chest_dl_get_noise_estimate(&q->chest), data, sf_idx, } else if (ret == LIBLTE_ERROR_INVALID_INPUTS) {
&q->harq_process[0], rvidx); fprintf(stderr, "Error calling pdsch_decode()\n");
if (ret == LIBLTE_ERROR) { return LIBLTE_ERROR;
q->pkt_errors++; } else if (ret == LIBLTE_SUCCESS) {
} else if (ret == LIBLTE_ERROR_INVALID_INPUTS) { if (VERBOSE_ISINFO()) {
fprintf(stderr, "Error calling pdsch_decode()\n"); INFO("Decoded Message: ", 0);
return LIBLTE_ERROR; vec_fprint_hex(stdout, data, ra_dl.mcs.tbs);
} else if (ret == LIBLTE_SUCCESS) { }
if (VERBOSE_ISINFO()) { }
INFO("Decoded Message: ", 0); q->pkts_total++;
vec_fprint_hex(stdout, data, ra_dl.mcs.tbs);
} }
} }
q->pkts_total++;
} }
} }
gettimeofday(&t[2], NULL); gettimeofday(&t[2], NULL);
get_time_interval(t); get_time_interval(t);
mean_exec_time = (float) VEC_EMA((float) t[0].tv_usec, mean_exec_time, 0.01); mean_exec_time = (float) VEC_EMA((float) t[0].tv_usec, mean_exec_time, 0.01);
if (crc_rem == rnti && ret == LIBLTE_SUCCESS) { if (found_dci > 0 && ret == LIBLTE_SUCCESS) {
return ra_dl.mcs.tbs; return ra_dl.mcs.tbs;
} else { } else {
return 0; return 0;

13
lte/phy/lib/ue/src/ue_mib.c
Unescape Escape View File

@ -36,8 +36,6 @@
#include "liblte/phy/utils/debug.h" #include "liblte/phy/utils/debug.h"
#include "liblte/phy/utils/vector.h" #include "liblte/phy/utils/vector.h"
#define MIB_FIND_THRESHOLD 0.0
int ue_mib_init_1_92(ue_mib_t * q, int ue_mib_init_1_92(ue_mib_t * q,
uint32_t cell_id, uint32_t cell_id,
lte_cp_t cp) lte_cp_t cp)
@ -83,7 +81,7 @@ int ue_mib_init_1_92(ue_mib_t * q,
goto clean_exit; goto clean_exit;
} }
sync_set_threshold(&q->sfind, MIB_FIND_THRESHOLD); sync_set_threshold(&q->sfind, 1.0); // Because we are capturing 5 ms frames and there is always peak
sync_sss_en(&q->sfind, true); sync_sss_en(&q->sfind, true);
sync_set_N_id_2(&q->sfind, cell.id % 3); sync_set_N_id_2(&q->sfind, cell.id % 3);
sync_cp_en(&q->sfind, false); sync_cp_en(&q->sfind, false);
@ -167,8 +165,6 @@ int ue_mib_decode_aligned_frame(ue_mib_t * q, cf_t *input,
if (ret < 0) { if (ret < 0) {
return LIBLTE_ERROR; return LIBLTE_ERROR;
} }
INFO("Channel estimated for %d ports, Noise: %f\n", q->chest.cell.nof_ports,
chest_dl_get_noise_estimate(&q->chest));
/* Reset decoder if we missed a frame */ /* Reset decoder if we missed a frame */
if ((q->last_frame_trial && (abs(q->frame_cnt - q->last_frame_trial) > 2)) || if ((q->last_frame_trial && (abs(q->frame_cnt - q->last_frame_trial) > 2)) ||
q->frame_cnt > 16) q->frame_cnt > 16)
@ -259,13 +255,6 @@ int ue_mib_sync_and_decode_1_92(ue_mib_t * q,
nf*MIB_FRAME_SIZE_SEARCH + peak_idx > MIB_FRAME_SIZE_SEARCH/10) nf*MIB_FRAME_SIZE_SEARCH + peak_idx > MIB_FRAME_SIZE_SEARCH/10)
{ {
// PSS and SSS detected and we have space to decode the PBCH. // PSS and SSS detected and we have space to decode the PBCH.
// Apply CFO correction
INFO("Correcting CFO: %f\n", sync_get_cfo(&q->sfind));
cfo_correct(&q->cfocorr, &signal[nf*MIB_FRAME_SIZE_SEARCH], &signal[nf*MIB_FRAME_SIZE_SEARCH],
-sync_get_cfo(&q->sfind) / MIB_FFT_SIZE);
INFO("Trying to decode PBCH\n",0); INFO("Trying to decode PBCH\n",0);
ret = ue_mib_decode_aligned_frame(q, ret = ue_mib_decode_aligned_frame(q,
&signal[nf*MIB_FRAME_SIZE_SEARCH+peak_idx-MIB_FRAME_SIZE_SEARCH/10], &signal[nf*MIB_FRAME_SIZE_SEARCH+peak_idx-MIB_FRAME_SIZE_SEARCH/10],

52
lte/phy/lib/ue/src/ue_sync.c
Unescape Escape View File

@ -46,12 +46,10 @@ cf_t dummy[MAX_TIME_OFFSET];
#define CURRENT_SLOTLEN_RE SLOT_LEN_RE(q->cell.nof_prb, 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 CURRENT_SFLEN_RE SF_LEN_RE(q->cell.nof_prb, q->cell.cp)
#define FIND_THRESHOLD 1.5 #define FIND_THRESHOLD 4.0
#define TRACK_THRESHOLD 0.8 #define TRACK_THRESHOLD 2.0
#define TRACK_MAX_LOST 10 #define TRACK_MAX_LOST 10
#define CFO_EMA_ALPHA 0.01
int ue_sync_init(ue_sync_t *q, int ue_sync_init(ue_sync_t *q,
lte_cell_t cell, lte_cell_t cell,
@ -69,9 +67,7 @@ int ue_sync_init(ue_sync_t *q,
bzero(q, sizeof(ue_sync_t)); bzero(q, sizeof(ue_sync_t));
ue_sync_reset(q); q->decode_sss_on_track = false;
q->decode_sss_on_track = true;
q->stream = stream_handler; q->stream = stream_handler;
q->recv_callback = recv_callback; q->recv_callback = recv_callback;
q->cell = cell; q->cell = cell;
@ -89,23 +85,23 @@ int ue_sync_init(ue_sync_t *q,
sync_set_threshold(&q->sfind, FIND_THRESHOLD); sync_set_threshold(&q->sfind, FIND_THRESHOLD);
q->sfind.cp = cell.cp; q->sfind.cp = cell.cp;
sync_cp_en(&q->sfind, false); sync_cp_en(&q->sfind, false);
sync_correct_cfo(&q->sfind, true);
sync_set_em_alpha(&q->sfind, 1);
sync_set_N_id_2(&q->strack, cell.id%3); sync_set_N_id_2(&q->strack, cell.id%3);
sync_set_threshold(&q->strack, TRACK_THRESHOLD); sync_set_threshold(&q->strack, TRACK_THRESHOLD);
q->strack.cp = cell.cp; q->strack.cp = cell.cp;
sync_cp_en(&q->strack, false); sync_cp_en(&q->strack, false);
sync_correct_cfo(&q->strack, false);
if (cfo_init(&q->cfocorr, CURRENT_SFLEN)) {
fprintf(stderr, "Error initiating CFO\n");
goto clean_exit;
}
q->input_buffer = vec_malloc(5 * CURRENT_SFLEN * sizeof(cf_t)); q->input_buffer = vec_malloc(5 * CURRENT_SFLEN * sizeof(cf_t));
if (!q->input_buffer) { if (!q->input_buffer) {
perror("malloc"); perror("malloc");
goto clean_exit; goto clean_exit;
} }
ue_sync_reset(q);
ret = LIBLTE_SUCCESS; ret = LIBLTE_SUCCESS;
} }
@ -124,7 +120,6 @@ void ue_sync_free(ue_sync_t *q) {
if (q->input_buffer) { if (q->input_buffer) {
free(q->input_buffer); free(q->input_buffer);
} }
cfo_free(&q->cfocorr);
sync_free(&q->sfind); sync_free(&q->sfind);
sync_free(&q->strack); sync_free(&q->strack);
@ -143,7 +138,7 @@ uint32_t ue_sync_get_sfidx(ue_sync_t *q) {
} }
float ue_sync_get_cfo(ue_sync_t *q) { float ue_sync_get_cfo(ue_sync_t *q) {
return 15000 * q->cur_cfo; return 15000 * sync_get_cfo(&q->strack);
} }
float ue_sync_get_sfo(ue_sync_t *q) { float ue_sync_get_sfo(ue_sync_t *q) {
@ -176,7 +171,7 @@ static int find_peak_ok(ue_sync_t *q) {
q->state = SF_TRACK; q->state = SF_TRACK;
INFO("Found peak at %d, value %.3f, SF_idx: %d, Cell_id: %d CP: %s\n", INFO("Found peak at %d, value %.3f, SF_idx: %d, Cell_id: %d CP: %s\n",
q->peak_idx, sync_get_peak_value(&q->sfind), q->sf_idx, q->cell.id, lte_cp_string(q->cell.cp)); q->peak_idx, sync_get_last_peak_value(&q->sfind), q->sf_idx, q->cell.id, lte_cp_string(q->cell.cp));
} else { } else {
INFO("Found peak at %d, SSS not detected\n", q->peak_idx); INFO("Found peak at %d, SSS not detected\n", q->peak_idx);
@ -188,16 +183,12 @@ int track_peak_ok(ue_sync_t *q, uint32_t track_idx) {
/* Make sure subframe idx is what we expect */ /* Make sure subframe idx is what we expect */
if ((q->sf_idx != sync_get_sf_idx(&q->strack)) && q->decode_sss_on_track) { if ((q->sf_idx != sync_get_sf_idx(&q->strack)) && q->decode_sss_on_track) {
INFO("Warning: Expected SF idx %d but got %d (%d,%g - %d,%g)!\n", if (sync_get_cell_id(&q->strack) == q->cell.id) {
q->sf_idx, sync_get_sf_idx(&q->strack), INFO("Warning: Expected SF idx %d but got %d (%d,%g - %d,%g)!\n",
q->sf_idx, sync_get_sf_idx(&q->strack),
q->strack.m0, q->strack.m0_value, q->strack.m1, q->strack.m1_value); q->strack.m0, q->strack.m0_value, q->strack.m1, q->strack.m1_value);
q->sf_idx = sync_get_sf_idx(&q->strack);
/* FIXME: What should we do in this case? }
* If the threshold is high enough, an OK peak means it is likely to be true
* Otherwise, maybe we should not trust the new sf_idx.
*/
q->sf_idx = sync_get_sf_idx(&q->strack);
//q->state = SF_FIND;
} else { } else {
q->time_offset = ((int) track_idx - (int) CURRENT_FFTSIZE); q->time_offset = ((int) track_idx - (int) CURRENT_FFTSIZE);
@ -210,8 +201,6 @@ int track_peak_ok(ue_sync_t *q, uint32_t track_idx) {
} }
} }
/* compute cumulative moving average CFO */
q->cur_cfo = VEC_EMA(sync_get_cfo(&q->strack), q->cur_cfo, CFO_EMA_ALPHA);
/* compute cumulative moving average time offset */ /* compute cumulative moving average time offset */
q->mean_time_offset = (float) VEC_CMA((float) q->time_offset, q->mean_time_offset, q->frame_total_cnt); q->mean_time_offset = (float) VEC_CMA((float) q->time_offset, q->mean_time_offset, q->frame_total_cnt);
@ -232,7 +221,7 @@ int track_peak_no(ue_sync_t *q) {
q->state = SF_FIND; q->state = SF_FIND;
} else { } else {
INFO("Tracking peak not found. Peak %.3f, %d lost\n", INFO("Tracking peak not found. Peak %.3f, %d lost\n",
sync_get_peak_value(&q->strack), (int) q->frame_no_cnt); sync_get_last_peak_value(&q->strack), (int) q->frame_no_cnt);
} }
return 1; return 1;
@ -301,7 +290,7 @@ int ue_sync_get_buffer(ue_sync_t *q, cf_t **sf_symbols) {
case SF_TRACK: case SF_TRACK:
ret = 1; ret = 1;
q->strack.sss_en = q->decode_sss_on_track; sync_sss_en(&q->strack, q->decode_sss_on_track);
q->sf_idx = (q->sf_idx + 1) % 10; q->sf_idx = (q->sf_idx + 1) % 10;
@ -343,7 +332,7 @@ int ue_sync_get_buffer(ue_sync_t *q, cf_t **sf_symbols) {
} }
/* Do CFO Correction and deliver the frame */ /* Do CFO Correction and deliver the frame */
cfo_correct(&q->cfocorr, q->input_buffer, q->input_buffer, -q->cur_cfo / CURRENT_FFTSIZE); cfo_correct(&q->sfind.cfocorr, q->input_buffer, q->input_buffer, -sync_get_cfo(&q->strack) / CURRENT_FFTSIZE);
*sf_symbols = q->input_buffer; *sf_symbols = q->input_buffer;
break; break;
@ -354,11 +343,10 @@ int ue_sync_get_buffer(ue_sync_t *q, cf_t **sf_symbols) {
void ue_sync_reset(ue_sync_t *q) { void ue_sync_reset(ue_sync_t *q) {
q->state = SF_FIND; q->state = SF_FIND;
sync_reset(&q->strack);
q->frame_ok_cnt = 0; q->frame_ok_cnt = 0;
q->frame_no_cnt = 0; q->frame_no_cnt = 0;
q->frame_total_cnt = 0; q->frame_total_cnt = 0;
q->cur_cfo = 0.0;
q->mean_time_offset = 0.0; q->mean_time_offset = 0.0;
q->time_offset = 0; q->time_offset = 0;
#ifdef MEASURE_EXEC_TIME #ifdef MEASURE_EXEC_TIME

8
lte/rrc/include/liblte/rrc/common/rrc_common.h
Unescape Escape View File

@ -32,6 +32,8 @@
#include <stdbool.h> #include <stdbool.h>
#include <stdint.h> #include <stdint.h>
typedef enum {SIB1=1, SIB2=2, SIB3=3, SIB4=4, SIB5=5, SIB6=6, SIB7=7, SIB8=8, SIB9=9, SIB_ERROR=0} sib_type_t;
typedef struct { typedef struct {
uint32_t mcc; // 3 digits in Decimal value uint32_t mcc; // 3 digits in Decimal value
uint32_t mnc; // 2 digits uint32_t mnc; // 2 digits
@ -45,4 +47,10 @@ typedef struct {
bool intraFreqReselection; bool intraFreqReselection;
} cell_access_info_t; } cell_access_info_t;
typedef struct {
sib_type_t type;
uint32_t n; // Order of entry in scheduling info list
uint32_t period;
} scheduling_info_t;
#endif #endif

18
lte/rrc/include/liblte/rrc/messages/bcch.h
Unescape Escape View File

@ -35,22 +35,6 @@
#include <stdint.h> #include <stdint.h>
#define SI_PERIODS 10
#define SI_X_PERIOD 10
typedef enum {BCCH_DLSCH_SIB1, BCCH_DLSCH_SIB2, BCCH_DLSCH_SIB3, BCCH_DLSCH_SIB6, BCCH_DLSCH_UNKNOWN} bcch_dlsch_sib_type_t;
typedef struct {
bcch_dlsch_sib_type_t type[SI_X_PERIOD];
uint32_t period;
} bcch_si_scheduling_info_t;
typedef struct {
uint32_t window_length_ms;
uint32_t nof_periods;
bcch_si_scheduling_info_t si_period_list[SI_PERIODS];
} bcch_si_scheduling_t;
LIBLTE_API int bcch_bch_pack(lte_cell_t *cell, LIBLTE_API int bcch_bch_pack(lte_cell_t *cell,
uint32_t sfn, uint32_t sfn,
@ -72,8 +56,6 @@ LIBLTE_API int bcch_dlsch_pack(void *bcch_dlsch_msg,
LIBLTE_API void* bcch_dlsch_unpack(uint8_t *buffer, LIBLTE_API void* bcch_dlsch_unpack(uint8_t *buffer,
uint32_t msg_nof_bits); uint32_t msg_nof_bits);
LIBLTE_API bcch_dlsch_sib_type_t bcch_dlsch_get_type(void *bcch_dlsch_msg);
LIBLTE_API void bcch_dlsch_fprint(void *bcch_dlsch_msg, LIBLTE_API void bcch_dlsch_fprint(void *bcch_dlsch_msg,
FILE *stream); FILE *stream);

5
lte/rrc/include/liblte/rrc/messages/sib1.h
Unescape Escape View File

@ -47,6 +47,11 @@ LIBLTE_API void bcch_dlsch_sib1_get_plmns(void *bcch_dlsch_msg,
LIBLTE_API void bcch_dlsch_sib1_get_cell_access_info(void *bcch_dlsch_msg, LIBLTE_API void bcch_dlsch_sib1_get_cell_access_info(void *bcch_dlsch_msg,
cell_access_info_t *info); cell_access_info_t *info);
LIBLTE_API int bcch_dlsch_sib1_get_scheduling_info(void *bcch_dlsch_msg,
uint32_t *si_window_length,
scheduling_info_t *info,
uint32_t max_elems);
void bcch_dlsch_sib1(BCCH_DL_SCH_Message_t *sib1, void bcch_dlsch_sib1(BCCH_DL_SCH_Message_t *sib1,
MCC_MNC_Digit_t mcc_val[3], MCC_MNC_Digit_t mcc_val[3],
MCC_MNC_Digit_t mnc_val[2], MCC_MNC_Digit_t mnc_val[2],

45
lte/rrc/include/liblte/rrc/messages/sib4.h
Unescape Escape View File

@ -0,0 +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/.
*
*/
#ifndef SIB4_
#define SIB4_
#include <stdio.h>
#include <stdlib.h>
#include "liblte/rrc/common/rrc_common.h"
#include "liblte/rrc/messages/bcch.h"
#include "liblte/phy/utils/bit.h"
#include "rrc_asn.h"
LIBLTE_API int bcch_dlsch_sib4_get_neighbour_cells(void *bcch_dlsch_msg,
uint32_t *neighbour_cell_ids,
uint32_t max_elems);
#endif

1
lte/rrc/include/liblte/rrc/rrc.h
Unescape Escape View File

@ -40,6 +40,7 @@
#include "liblte/rrc/messages/bcch.h" #include "liblte/rrc/messages/bcch.h"
#include "liblte/rrc/messages/sib1.h" #include "liblte/rrc/messages/sib1.h"
#include "liblte/rrc/messages/sib4.h"
#include "liblte/rrc/common/rrc_common.h" #include "liblte/rrc/common/rrc_common.h"
#ifdef __cplusplus #ifdef __cplusplus

11
lte/rrc/lib/messages/src/bcch.c
Unescape Escape View File

@ -31,11 +31,9 @@
#include "liblte/rrc/messages/sib1.h" #include "liblte/rrc/messages/sib1.h"
#include "liblte/rrc/messages/bcch.h" #include "liblte/rrc/messages/bcch.h"
#include "liblte/phy/utils/bit.h" #include "liblte/phy/utils/bit.h"
#include "liblte/phy/utils/debug.h"
#include "rrc_asn.h" #include "rrc_asn.h"
int bcch_bch_pack(lte_cell_t *cell, uint32_t sfn, uint8_t *buffer, uint32_t buffer_size_bytes) { int bcch_bch_pack(lte_cell_t *cell, uint32_t sfn, uint8_t *buffer, uint32_t buffer_size_bytes) {
MasterInformationBlock_t req; MasterInformationBlock_t req;
@ -201,18 +199,17 @@ void* bcch_dlsch_unpack(uint8_t *buffer, uint32_t msg_nof_bits) {
fprintf(stderr, "Decoding failed.\n"); fprintf(stderr, "Decoding failed.\n");
return NULL; return NULL;
} else { } else {
bcch_dlsch_fprint(msg, stdout);
return msg; return msg;
} }
} }
bcch_dlsch_sib_type_t bcch_dlsch_get_type(void *bcch_dlsch_msg) { sib_type_t bcch_dlsch_get_type(void *bcch_dlsch_msg) {
BCCH_DL_SCH_Message_t *msg = (BCCH_DL_SCH_Message_t*) bcch_dlsch_msg; BCCH_DL_SCH_Message_t *msg = (BCCH_DL_SCH_Message_t*) bcch_dlsch_msg;
switch(msg->message.present) { switch(msg->message.present) {
case BCCH_DL_SCH_MessageType_PR_c1: case BCCH_DL_SCH_MessageType_PR_c1:
switch (msg->message.choice.c1.present) { switch (msg->message.choice.c1.present) {
case BCCH_DL_SCH_MessageType__c1_PR_systemInformationBlockType1: case BCCH_DL_SCH_MessageType__c1_PR_systemInformationBlockType1:
return BCCH_DLSCH_SIB1; return SIB1;
break; break;
default: default:
fprintf(stderr, "Message type not supported\n"); fprintf(stderr, "Message type not supported\n");
@ -224,7 +221,7 @@ bcch_dlsch_sib_type_t bcch_dlsch_get_type(void *bcch_dlsch_msg) {
bcch_dlsch_fprint(bcch_dlsch_msg, stderr); bcch_dlsch_fprint(bcch_dlsch_msg, stderr);
break; break;
} }
return BCCH_DLSCH_UNKNOWN; return SIB_ERROR;
} }
void bcch_dlsch_fprint(void *bcch_dlsch_msg, FILE *stream) { void bcch_dlsch_fprint(void *bcch_dlsch_msg, FILE *stream) {

56
lte/rrc/lib/messages/src/sib1.c
Unescape Escape View File

@ -74,14 +74,19 @@ void bcch_dlsch_sib1_get_cell_access_info(void *bcch_dlsch_msg, cell_access_info
} }
uint32_t get_si_period(long int period) { uint32_t get_si_period(long int period) {
return 8<<period; return 8<<(period);
} }
bcch_dlsch_sib_type_t get_si_type(SIB_Type_t *type) { sib_type_t get_si_type(SIB_Type_t *type) {
switch(*type) { switch(*type) {
case SIB_Type_sibType3: return BCCH_DLSCH_SIB3; case SIB_Type_sibType3: return SIB3;
case SIB_Type_sibType6: return BCCH_DLSCH_SIB6; case SIB_Type_sibType4: return SIB4;
default: return BCCH_DLSCH_UNKNOWN; case SIB_Type_sibType5: return SIB5;
case SIB_Type_sibType6: return SIB6;
case SIB_Type_sibType7: return SIB7;
case SIB_Type_sibType8: return SIB8;
case SIB_Type_sibType9: return SIB9;
default: return SIB_ERROR;
} }
} }
@ -97,21 +102,40 @@ uint32_t get_window(long int window_length) {
default: return 0; default: return 0;
} }
} }
int bcch_dlsch_sib1_get_scheduling_info(void *bcch_dlsch_msg,
void bcch_dlsch_sib1_get_si_scheduling(void *bcch_dlsch_msg, bcch_si_scheduling_t *si_sched) { uint32_t *si_window_length,
scheduling_info_t *info,
uint32_t max_elems)
{
BCCH_DL_SCH_Message_t *msg = (BCCH_DL_SCH_Message_t*) bcch_dlsch_msg; BCCH_DL_SCH_Message_t *msg = (BCCH_DL_SCH_Message_t*) bcch_dlsch_msg;
SystemInformationBlockType1_t *sib1 = &(msg->message.choice.c1.choice.systemInformationBlockType1); SystemInformationBlockType1_t *sib1 = &(msg->message.choice.c1.choice.systemInformationBlockType1);
si_sched->nof_periods = MIN(SI_PERIODS, sib1->schedulingInfoList.list.count); uint32_t nelems = 0;
for (int i=0;i<si_sched->nof_periods;i++) {
SchedulingInfo_t *s = sib1->schedulingInfoList.list.array[0]; if (max_elems > 0 && info != NULL) {
si_sched->si_period_list[i].period = get_si_period(s->si_Periodicity); /* First is always SIB2 */
int jmax = MIN(SI_X_PERIOD, s->sib_MappingInfo.list.count); info[0].type = SIB2;
for (int j=0;j<jmax;j++) { info[0].n = 0;
si_sched->si_period_list[i].type[j] = get_si_type(s->sib_MappingInfo.list.array[j]); info[0].period = get_si_period(sib1->schedulingInfoList.list.array[0]->si_Periodicity);
nelems++;
for (int i=0;i<sib1->schedulingInfoList.list.count;i++) {
SchedulingInfo_t *s = sib1->schedulingInfoList.list.array[i];
for (int j=0;j<s->sib_MappingInfo.list.count;j++) {
if (nelems < max_elems) {
info[nelems].type = get_si_type(s->sib_MappingInfo.list.array[j]);
info[nelems].n = i;
info[nelems].period = get_si_period(s->si_Periodicity);
nelems++;
}
}
} }
}
if (si_window_length) {
*si_window_length = get_window(sib1->si_WindowLength);
} }
si_sched->window_length_ms = get_window(sib1->si_WindowLength); return nelems;
} }
MCC_MNC_Digit_t *dup_digit(MCC_MNC_Digit_t value) { MCC_MNC_Digit_t *dup_digit(MCC_MNC_Digit_t value) {

56
lte/rrc/lib/messages/src/sib4.c
Unescape Escape View File

@ -0,0 +1,56 @@
/**
*
* \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 <stdio.h>
#include <stdlib.h>
#include "liblte/rrc/common/rrc_common.h"
#include "liblte/rrc/messages/bcch.h"
#include "liblte/rrc/messages/sib4.h"
#include "liblte/phy/utils/bit.h"
#include "rrc_asn.h"
#include <BCCH-DL-SCH-MessageType.h>
int bcch_dlsch_sib4_get_neighbour_cells(void *bcch_dlsch_msg, uint32_t *neighbour_cell_ids, uint32_t max_elems)
{
int i = 0;
BCCH_DL_SCH_Message_t *msg = (BCCH_DL_SCH_Message_t*) bcch_dlsch_msg;
SystemInformationBlockType4_t *sib4 =
&(msg->message.choice.c1.choice.systemInformation.criticalExtensions.choice.systemInformation_r8.sib_TypeAndInfo.list.array[0]->choice.sib4);
if (sib4->intraFreqNeighCellList) {
for (i=0;i<sib4->intraFreqNeighCellList->list.count && i<max_elems;i++) {
IntraFreqNeighCellInfo_t *cellInfo = sib4->intraFreqNeighCellList->list.array[i];
neighbour_cell_ids[i] = cellInfo->physCellId;
}
}
return i;
}

9
matlab/tests/test_sss.m
Unescape Escape View File

@ -7,15 +7,15 @@ m1=10;
%m0=26; %m0=26;
%m1=21; %m1=21;
recordedWaveform = signal; recordedWaveform = x;
if (~isempty(recordedWaveform)) if (~isempty(recordedWaveform))
Npackets = floor(length(signal)/19200)-1; Npackets = floor(length(recordedWaveform)/19200)-1;
SNR_values = 0; SNR_values = 0;
end end
error = zeros(6,length(SNR_values)); error = zeros(6,length(SNR_values));
enb = struct('NCellID',196,'NSubframe',0,'NDLRB',6,'CellRefP',1,'CyclicPrefix','Normal','DuplexMode','FDD'); enb = struct('NCellID',2,'NSubframe',0,'NDLRB',6,'CellRefP',1,'CyclicPrefix','Normal','DuplexMode','FDD');
sss=lteSSS(enb); sss=lteSSS(enb);
cfg.Seed = 2; % Random channel seed cfg.Seed = 2; % Random channel seed
@ -68,6 +68,7 @@ for snr_idx=1:length(SNR_values)
end end
offset = lteDLFrameOffset(enb,rxWaveform); offset = lteDLFrameOffset(enb,rxWaveform);
offsetVec(i)=offset;
rxWaveform = [rxWaveform(1+offset:end,:); zeros(offset,1)]; rxWaveform = [rxWaveform(1+offset:end,:); zeros(offset,1)];
subframe_rx = lteOFDMDemodulate(enb,rxWaveform,1); subframe_rx = lteOFDMDemodulate(enb,rxWaveform,1);
@ -111,7 +112,7 @@ for snr_idx=1:length(SNR_values)
error(3,snr_idx) = error(3,snr_idx) + ((idx ~= m0 && idx ~= m1)); error(3,snr_idx) = error(3,snr_idx) + ((idx ~= m0 && idx ~= m1));
% libLTE results % libLTE results
[n,sf_idx,lt_corr0,lt_corr1,lt_sss0,lt_sss1]=liblte_sss(enb,rxWaveform,'full'); [n,sf_idx,lt_corr0]=liblte_sss(enb,rxWaveform,'full');
[m, idx]=max(lt_corr0); [m, idx]=max(lt_corr0);
error(4,snr_idx) = error(4,snr_idx) + ((idx ~= m0 && idx ~= m1)); error(4,snr_idx) = error(4,snr_idx) + ((idx ~= m0 && idx ~= m1));

Write Preview
Loading…
Cancel
Save