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srsLTE
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Cell search example looks for 3 cells per frequency

This commit is contained in:
ismagom 2014-08-02 03:05:54 +02:00
parent 3844d19916
commit 182c9958bb
3 changed files with 21 additions and 15 deletions
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26
lte/phy/examples/cell_search.c
View File

@ -53,7 +53,7 @@ int band = -1;
int earfcn_start=-1, earfcn_end = -1;
int nof_frames_total = 50;
int nof_frames_detected = 10;
float threshold = -1;
float threshold = CS_FIND_THRESHOLD;
float uhd_gain = 60.0;
@ -171,7 +171,7 @@ int decode_pbch(void *uhd, cf_t *buffer, ue_celldetect_result_t *found_cell)
return LIBLTE_SUCCESS;
}
int find_cell(void *uhd, ue_celldetect_t *s, cf_t *buffer, ue_celldetect_result_t *found_cell)
int find_cell(void *uhd, ue_celldetect_t *s, cf_t *buffer, ue_celldetect_result_t found_cell[3])
{
int n;
@ -190,7 +190,7 @@ int find_cell(void *uhd, ue_celldetect_t *s, cf_t *buffer, ue_celldetect_result_
return LIBLTE_ERROR;
}
n = ue_celldetect_scan(s, buffer, flen, found_cell);
n = ue_celldetect_scan(s, buffer, flen, &found_cell[nof_scanned_cells]);
switch(n) {
case CS_FRAME_UNALIGNED:
printf("Realigning frame\n");
@ -200,10 +200,12 @@ int find_cell(void *uhd, ue_celldetect_t *s, cf_t *buffer, ue_celldetect_result_
}
return LIBLTE_ERROR;
case CS_CELL_DETECTED:
if (found_cell->peak > 0) {
if (found_cell[nof_scanned_cells].peak > 0) {
printf("\n\tCELL ID: %d, CP: %s, Peak: %.2f, Mode: %d/%d\n",
found_cell->cell_id, lte_cp_string(found_cell->cp),
found_cell->peak, found_cell->mode, s->nof_frames_detected);
found_cell[nof_scanned_cells].cell_id,
lte_cp_string(found_cell[nof_scanned_cells].cp),
found_cell[nof_scanned_cells].peak, found_cell[nof_scanned_cells].mode,
s->nof_frames_detected);
}
nof_scanned_cells++;
@ -216,7 +218,7 @@ int find_cell(void *uhd, ue_celldetect_t *s, cf_t *buffer, ue_celldetect_result_
fprintf(stderr, "Error calling cellsearch_scan()\n");
return LIBLTE_ERROR;
}
} while(nof_scanned_cells < 3 && n != CS_CELL_DETECTED);
} while(nof_scanned_cells < 3);
INFO("Stopping receiver...\n", 0);
cuhd_stop_rx_stream(uhd);
@ -229,7 +231,7 @@ int main(int argc, char **argv) {
int n;
void *uhd;
ue_celldetect_t s;
ue_celldetect_result_t found_cell;
ue_celldetect_result_t found_cells[3];
cf_t *buffer;
int nof_freqs;
lte_earfcn_t channels[MAX_EARFCN];
@ -286,18 +288,22 @@ int main(int argc, char **argv) {
printf("\n");
}
n = find_cell(uhd, &s, buffer, &found_cell);
n = find_cell(uhd, &s, buffer, found_cells);
if (n < 0) {
fprintf(stderr, "Error searching cell\n");
exit(-1);
}
if (n == CS_CELL_DETECTED) {
if (decode_pbch(uhd, buffer, &found_cell)) {
for (int i=0;i<3;i++) {
if (found_cells[i].peak > threshold/2) {
if (decode_pbch(uhd, buffer, &found_cells[i])) {
fprintf(stderr, "Error decoding PBCH\n");
exit(-1);
}
}
}
}
}
ue_celldetect_free(&s);
cuhd_close(uhd);

4
lte/phy/lib/sync/src/sync.c
View File

@ -280,8 +280,8 @@ int sync_find(sync_t *q, cf_t *input, uint32_t find_offset, uint32_t *peak_posit
ret = LIBLTE_SUCCESS;
}
INFO("SYNC ret=%d pos=%d peak=%.2f energy=%.3f threshold=%.2f sf_idx=%d\n",
ret, peak_pos, q->peak_value, energy, q->threshold, q->sf_idx);
INFO("SYNC ret=%d N_id_2=%d pos=%d peak=%.2f energy=%.3f threshold=%.2f sf_idx=%d\n",
ret, q->N_id_2, peak_pos, q->peak_value, energy, q->threshold, q->sf_idx);
} else if (lte_N_id_2_isvalid(q->N_id_2)) {
fprintf(stderr, "Must call sync_set_N_id_2() first!\n");

2
lte/phy/lib/ue/src/ue_celldetect.c
View File

@ -211,7 +211,7 @@ int ue_celldetect_scan(ue_celldetect_t * q,
for (uint32_t nf=0;nf<nof_input_frames;nf++) {
sync_set_N_id_2(&q->sfind, q->current_N_id_2);
printf("[%3d/%3d]: Searching cells with N_id_2=%d. %d frames\n",
DEBUG("[%3d/%3d]: Searching cells with N_id_2=%d. %d frames\n",
q->current_nof_detected, q->current_nof_total, q->current_N_id_2, nof_input_frames);
/* Find peak and cell id */