mirror of https://github.com/PentHertz/srsLTE.git
Fixed bug when receiving all zeros samples
This commit is contained in:
ismagom
parent
6459f516d8
commit
f588d670ad
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@ -57,7 +57,7 @@
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#define NOF_PORTS 2
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float find_threshold = 40.0, track_threshold = 8.0;
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float find_threshold = 30.0, track_threshold = 10.0;
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int max_track_lost = 20, nof_slots = -1;
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int track_len=300;
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char *input_file_name = NULL;
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@ -65,7 +65,7 @@ int disable_plots = 0;
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int go_exit=0;
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float uhd_freq = 2400000000.0, uhd_gain = 20.0;
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float uhd_freq = 2600000000.0, uhd_gain = 20.0;
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char *uhd_args = "";
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filesource_t fsrc;
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@ -328,6 +328,7 @@ int main(int argc, char **argv) {
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float cfo;
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int n;
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int nof_found_mib = 0;
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float timeoffset = 0;
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#ifdef DISABLE_UHD
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if (argc < 3) {
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@ -398,18 +399,23 @@ int main(int argc, char **argv) {
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INFO("FIND %3d:\tPAR=%.2f\n", frame_cnt, sync_get_peak_to_avg(&sfind));
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if (find_idx != -1) {
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/* if found peak, go to track and set track threshold */
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cell_id = sync_get_cell_id(&sfind);
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if (cell_id != -1) {
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frame_cnt = -1;
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last_found = 0;
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sync_set_threshold(&strack, track_threshold);
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sync_force_N_id_2(&strack, sync_get_N_id_2(&sfind));
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cell_id = sync_get_cell_id(&sfind);
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mib_decoder_init(cell_id);
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nof_found_mib = 0;
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nslot = sync_get_slot_id(&sfind);
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nslot=(nslot+10)%20;
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cfo = 0;
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timeoffset = 0;
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printf("\n");
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state = TRACK;
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} else {
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printf("cellid=-1\n");
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}
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}
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if (verbose == VERBOSE_NONE) {
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printf("Finding PSS... PAR=%.2f\r", sync_get_peak_to_avg(&sfind));
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@ -423,8 +429,10 @@ int main(int argc, char **argv) {
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if (track_idx != -1) {
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/* compute cumulative moving average CFO */
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cfo = (sync_get_cfo(&strack) + frame_cnt * cfo) / (frame_cnt + 1);
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/* compute cumulative moving average time offset */
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timeoffset = (float) (track_idx-track_len + timeoffset * frame_cnt) / (frame_cnt + 1);
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last_found = frame_cnt;
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find_idx += track_idx - track_len;
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find_idx = (find_idx + track_idx - track_len)%FLEN;
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if (nslot != sync_get_slot_id(&strack)) {
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INFO("Expected slot %d but got %d\n", nslot, sync_get_slot_id(&strack));
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printf("\r\n");
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@ -432,6 +440,9 @@ int main(int argc, char **argv) {
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printf("\r\n");
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state = FIND;
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}
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} else {
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/* if sync not found, adjust time offset with the averaged value */
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find_idx = (find_idx + (int) timeoffset)%FLEN;
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}
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/* if we missed too many PSS go back to FIND */
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@ -448,11 +459,10 @@ int main(int argc, char **argv) {
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cfo_correct(&cfocorr, input_buffer, -cfo/128);
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if (nslot == 0) {
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if (nslot == 0 && find_idx + 960 < FLEN) {
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INFO("Finding MIB at idx %d\n", find_idx);
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if (mib_decoder_run(&input_buffer[find_idx], &mib)) {
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INFO("MIB detected attempt=%d\n", frame_cnt);
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last_found = frame_cnt;
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if (verbose == VERBOSE_NONE) {
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if (!nof_found_mib) {
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printf("\r\n");
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@ -466,8 +476,8 @@ int main(int argc, char **argv) {
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INFO("MIB not found attempt %d\n",frame_cnt);
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}
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if (frame_cnt) {
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printf("SFN: %4d\tCFO: %+.4f KHz\tTimeOffset: %4d\tErrors: %4d/%4d\tErrorRate: %.1e\r", mib.sfn,
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cfo*15, find_idx, frame_cnt-2*(nof_found_mib-1), frame_cnt,
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printf("SFN: %4d, CFO: %+.4f KHz, SFO: %+.4f Khz, TimeOffset: %4d, Errors: %4d/%4d, ErrorRate: %.1e\r", mib.sfn,
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cfo*15, timeoffset/5, find_idx, frame_cnt-2*(nof_found_mib-1), frame_cnt,
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(float) (frame_cnt-2*(nof_found_mib-1))/frame_cnt);
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fflush(stdout);
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}
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@ -33,6 +33,7 @@
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#include <stdlib.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <math.h>
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#include "phch.h"
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#include "lte/phch/pbch.h"
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@ -57,6 +58,7 @@ bool pbch_exists(int nframe, int nslot) {
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int pbch_cp(cf_t *input, cf_t *output, int nof_prb, lte_cp_t cp, int cell_id, bool put) {
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int i;
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cf_t *ptr;
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assert(cell_id >= 0);
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if (put) {
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ptr = input;
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output += nof_prb * RE_X_RB / 2 - 36;
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@ -110,6 +112,9 @@ int pbch_get(cf_t *slot1_data, cf_t *pbch, int nof_prb, lte_cp_t cp, int cell_id
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/** Initializes the PBCH channel receiver */
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int pbch_init(pbch_t *q, int cell_id, lte_cp_t cp) {
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int ret = -1;
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if (cell_id < 0) {
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return -1;
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}
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bzero(q, sizeof(pbch_t));
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q->cell_id = cell_id;
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q->cp = cp;
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@ -374,9 +379,24 @@ int pbch_decode_frame(pbch_t *q, pbch_mib_t *mib, int src, int dst, int n, int n
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/* unrate matching */
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rm_conv_rx(q->temp, q->pbch_rm_f, 4 * nof_bits, 120);
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/* FIXME: If channel estimates are zero, received LLR are NaN. Check and return error */
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for (j=0;j<120;j++) {
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if (isnan(q->pbch_rm_f[j]) || isinf(q->pbch_rm_f[j])) {
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return 0;
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}
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}
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/* decode */
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viterbi_decode_f(&q->decoder, q->pbch_rm_f, q->data);
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int c=0;
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for (j=0;j<40;j++) {
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c+=q->data[j];
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}
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if (!c) {
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c=1;
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}
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if (!pbch_crc_check(q->data, nof_ports)) {
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/* unpack MIB */
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pbch_mib_unpack(q->data, mib);
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