int lte_band_get_fd_region(enum band_geographical_area region, lte_earfcn_t *earfcn, int max_elems) { int i; int n; int nof_fd = 0; for (i=0;i<NOF_LTE_BANDS && max_elems > 0;i++) { if (lte_bands[i].area == region) { n = lte_band_get_fd_band(i, &earfcn[nof_fd], -1, -1, max_elems); if (n != -1) { nof_fd += n; max_elems -= n; } else { return -1; } } } return nof_fd; }
int main(int argc, char **argv) { int n; void *uhd; ue_celldetect_t s; ue_celldetect_result_t found_cells[3]; cf_t *buffer; int nof_freqs; lte_earfcn_t channels[MAX_EARFCN]; uint32_t freq; pbch_mib_t mib; parse_args(argc, argv); printf("Opening UHD device...\n"); if (cuhd_open(uhd_args, &uhd)) { fprintf(stderr, "Error opening uhd\n"); exit(-1); } cuhd_set_rx_gain(uhd, uhd_gain); nof_freqs = lte_band_get_fd_band(band, channels, earfcn_start, earfcn_end, MAX_EARFCN); if (nof_freqs < 0) { fprintf(stderr, "Error getting EARFCN list\n"); exit(-1); } buffer = vec_malloc(sizeof(cf_t) * 96000); if (!buffer) { perror("malloc"); return LIBLTE_ERROR; } if (ue_celldetect_init(&s)) { fprintf(stderr, "Error initiating UE sync module\n"); exit(-1); } if (threshold > 0) { ue_celldetect_set_threshold(&s, threshold); } if (nof_frames_total > 0) { ue_celldetect_set_nof_frames_total(&s, nof_frames_total); } if (nof_frames_detected > 0) { ue_celldetect_set_nof_frames_detected(&s, nof_frames_detected); } for (freq=0;freq<nof_freqs;freq+=10) { /* set uhd_freq */ cuhd_set_rx_freq(uhd, (double) channels[freq].fd * MHZ); cuhd_rx_wait_lo_locked(uhd); usleep(10000); INFO("Set uhd_freq to %.3f MHz\n", (double) channels[freq].fd * MHZ/1000000); printf("[%3d/%d]: EARFCN %d Freq. %.2f MHz looking for PSS. \r", freq, nof_freqs, channels[freq].id, channels[freq].fd);fflush(stdout); if (VERBOSE_ISINFO()) { printf("\n"); } n = find_cell(uhd, &s, buffer, found_cells); if (n < 0) { fprintf(stderr, "Error searching cell\n"); exit(-1); } if (n == CS_CELL_DETECTED) { for (int i=0;i<3;i++) { if (found_cells[i].peak > threshold/2) { if (decode_pbch(uhd, buffer, &found_cells[i], nof_frames_total, &mib)) { fprintf(stderr, "Error decoding PBCH\n"); exit(-1); } } } } } ue_celldetect_free(&s); cuhd_close(uhd); exit(0); }
int main(int argc, char **argv) { int frame_cnt, valid_frames; int freq; int cell_id; sync_t sfind, strack; float max_peak_to_avg; float sfo; int find_idx, track_idx, last_found; enum sync_state state; int n; filesink_t fs; if (argc < 3) { usage(argv[0]); exit(-1); } parse_args(argc,argv); if (base_init(FLEN)) { fprintf(stderr, "Error initializing memory\n"); exit(-1); } if (sync_init(&sfind, FLEN)) { fprintf(stderr, "Error initiating PSS/SSS\n"); exit(-1); } sync_pss_det_peak_to_avg(&sfind); if (sync_init(&strack, track_len)) { fprintf(stderr, "Error initiating PSS/SSS\n"); exit(-1); } sync_pss_det_peak_to_avg(&strack); nof_bands = lte_band_get_fd_band(band, channels, earfcn_start, earfcn_end, MAX_EARFCN); printf("RSSI scan: %d freqs in band %d, RSSI threshold %.2f dBm\n", nof_bands, band, rssi_threshold); n = rssi_scan(); if (n == -1) { exit(-1); } printf("\nDone. Starting PSS search on %d channels\n", n); usleep(500000); INFO("Setting sampling frequency %.2f MHz\n", (float) SAMP_FREQ/MHZ); cuhd_set_rx_srate(uhd, SAMP_FREQ); cuhd_set_rx_gain(uhd, uhd_gain); print_to_matlab(); filesink_init(&fs, "test.dat", COMPLEX_FLOAT_BIN); freq=0; state = INIT; find_idx = 0; max_peak_to_avg = 0; last_found = 0; frame_cnt = 0; while(freq<nof_bands) { /* scan only bands above rssi_threshold */ if (!IS_SIGNAL(freq)) { INFO("[%3d/%d]: Skipping EARFCN %d %.2f MHz RSSI %.2f dB\n", freq, nof_bands, channels[freq].id, channels[freq].fd,10*log10f(rssi[freq]) + 30); freq++; } else { if (state == TRACK || state == FIND) { cuhd_recv(uhd, &input_buffer[FLEN], FLEN, 1); } switch(state) { case INIT: DEBUG("Stopping receiver...\n",0); cuhd_stop_rx_stream(uhd); /* set freq */ cuhd_set_rx_freq(uhd, (double) channels[freq].fd * MHZ); cuhd_rx_wait_lo_locked(uhd); DEBUG("Set freq to %.3f MHz\n", (double) channels[freq].fd); DEBUG("Starting receiver...\n",0); cuhd_start_rx_stream(uhd); /* init variables */ frame_cnt = 0; max_peak_to_avg = -99; cell_id = -1; /* receive first frame */ cuhd_recv(uhd, input_buffer, FLEN, 1); /* set find_threshold and go to FIND state */ sync_set_threshold(&sfind, find_threshold); sync_force_N_id_2(&sfind, -1); state = FIND; break; case FIND: /* find peak in all frame */ find_idx = sync_run(&sfind, &input_buffer[FLEN]); DEBUG("[%3d/%d]: PAR=%.2f\n", freq, nof_bands, sync_get_peak_to_avg(&sfind)); if (find_idx != -1) { /* if found peak, go to track and set lower threshold */ frame_cnt = -1; last_found = 0; sync_set_threshold(&strack, track_threshold); sync_force_N_id_2(&strack, sync_get_N_id_2(&sfind)); state = TRACK; INFO("[%3d/%d]: EARFCN %d Freq. %.2f MHz PSS found PAR %.2f dB\n", freq, nof_bands, channels[freq].id, channels[freq].fd, 10*log10f(sync_get_peak_to_avg(&sfind))); } else { if (frame_cnt >= nof_frames_find) { state = INIT; printf("[%3d/%d]: EARFCN %d Freq. %.2f MHz No PSS found\r", freq, nof_bands, channels[freq].id, channels[freq].fd, frame_cnt - last_found); if (VERBOSE_ISINFO()) { printf("\n"); } freq++; } } break; case TRACK: INFO("Tracking PSS find_idx %d offset %d\n", find_idx, find_idx + track_len); filesink_write(&fs, &input_buffer[FLEN+find_idx+track_len], track_len); track_idx = sync_run(&strack, &input_buffer[FLEN + find_idx - track_len]); p2a_v[frame_cnt] = sync_get_peak_to_avg(&strack); /* save cell id for the best peak-to-avg */ if (p2a_v[frame_cnt] > max_peak_to_avg) { max_peak_to_avg = p2a_v[frame_cnt]; cell_id = sync_get_cell_id(&strack); } if (track_idx != -1) { cfo_v[frame_cnt] = sync_get_cfo(&strack); last_found = frame_cnt; find_idx += track_idx - track_len; idx_v[frame_cnt] = find_idx; } else { idx_v[frame_cnt] = -1; cfo_v[frame_cnt] = 0.0; } /* if we missed to many PSS it is not a cell, next freq */ if (frame_cnt - last_found > max_track_lost) { INFO("\n[%3d/%d]: EARFCN %d Freq. %.2f MHz %d frames lost\n", freq, nof_bands, channels[freq].id, channels[freq].fd, frame_cnt - last_found); state = INIT; freq++; } else if (frame_cnt >= nof_frames_track) { state = DONE; } break; case DONE: cfo[freq] = mean_valid(idx_v, cfo_v, frame_cnt); p2a[freq] = mean_valid(idx_v, p2a_v, frame_cnt); valid_frames = preprocess_idx(idx_v, idx_valid, t, frame_cnt); sfo = sfo_estimate_period(idx_valid, t, valid_frames, FLEN_PERIOD); printf("\n[%3d/%d]: FOUND EARFCN %d Freq. %.2f MHz. " "PAR %2.2f dB, CFO=%+.2f KHz, SFO=%+2.3f KHz, CELL_ID=%3d\n", freq, nof_bands, channels[freq].id, channels[freq].fd, 10*log10f(p2a[freq]), cfo[freq] * 15, sfo / 1000, cell_id); state = INIT; freq++; break; } if (state == TRACK || (state == FIND && frame_cnt)) { memcpy(input_buffer, &input_buffer[FLEN], FLEN * sizeof(cf_t)); } frame_cnt++; } } print_to_matlab(); sync_free(&sfind); base_free(); printf("\n\nDone\n"); exit(0); }
int lte_band_get_fd_band_all(int band, lte_earfcn_t *earfcn, int max_elems) { return lte_band_get_fd_band(band, earfcn, -1, -1, max_elems); }