int sync_init(sync_t *q, uint32_t frame_size, uint32_t fft_size) { int ret = LIBLTE_ERROR_INVALID_INPUTS; if (q != NULL && frame_size <= 307200 && fft_size_isvalid(fft_size)) { ret = LIBLTE_ERROR; bzero(q, sizeof(sync_t)); q->detect_cp = true; q->cp = CPNORM; q->mean_peak_value = 0.0; q->sss_en = true; q->correct_cfo = true; q->mean_cfo = 0; q->N_id_2 = 1000; q->N_id_1 = 1000; q->fft_size = fft_size; q->frame_size = frame_size; q->sss_alg = SSS_PARTIAL_3; if (pss_synch_init_fft(&q->pss, frame_size, fft_size)) { fprintf(stderr, "Error initializing PSS object\n"); goto clean_exit; } if (sss_synch_init(&q->sss, fft_size)) { fprintf(stderr, "Error initializing SSS object\n"); 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); ret = LIBLTE_SUCCESS; } else { 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; }
int main(int argc, char **argv) { cf_t *input_buffer, *sf_symbols = NULL; int frame_cnt; ue_sync_t s; int pos; pss_synch_t pss; float peak; struct timeval t[3]; float mean_ce_time=0; bool signal_detected; lte_fft_t fft; lte_cell_t cell; bzero(&cell, sizeof(lte_cell_t)); parse_args(argc, argv); #ifndef DISABLE_GRAPHICS if (!disable_plots) { init_plots(); } #endif input_init(); if (ue_sync_init(&s, cuhd_set_rx_srate, cuhd_recv_wrapper, uhd)) { fprintf(stderr, "Error initiating UE sync module\n"); exit(-1); } ue_sync_pbch_enable(&s, true); signal_detected = true; frame_cnt = 0; mean_ce_time=0; uint32_t valid_frames=0; //uint32_t unaligned = 0; while (frame_cnt < nof_frames || nof_frames == -1) { int n = ue_sync_get_buffer(&s, &input_buffer); if (n < 0) { fprintf(stderr, "Error calling sync work()\n"); exit(-1); } if (n == 1 && ue_sync_get_sfidx(&s) == 0) { if (signal_detected) { cell = ue_sync_get_cell(&s); pss_synch_init_fft(&pss, SF_LEN(lte_symbol_sz(cell.nof_prb), cell.cp), lte_symbol_sz(cell.nof_prb)); pss_synch_set_N_id_2(&pss, cell.id%3); sf_symbols = vec_malloc(SLOT_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t)); if (!sf_symbols) { perror("malloc"); exit(-1); } lte_fft_init(&fft, cell.cp, cell.nof_prb); signal_detected = false; } mean_ce_time = (float) (mean_ce_time + (float) t[0].tv_usec * valid_frames) / (valid_frames+1); valid_frames++; #ifndef DISABLE_GRAPHICS if (!disable_plots && !(valid_frames % 5) && sf_symbols) { /* Run FFT for the second slot */ lte_fft_run_slot(&fft, input_buffer, sf_symbols); int i; int nof_re = SLOT_LEN_RE(cell.nof_prb, cell.cp); for (i = 0; i < nof_re; i++) { tmp_plot[i] = 10 * log10f(cabsf(sf_symbols[i])); if (isinf(tmp_plot[i])) { tmp_plot[i] = -80; } } plot_real_setNewData(&poutfft, tmp_plot, nof_re); } #endif pos = pss_synch_find_pss(&pss, input_buffer, &peak, NULL); /*if (pos > 962 || pos < 958) { unaligned++; } */ printf("CELL_ID: %3d CFO: %+.4f KHz, SFO: %+.4f Khz, TimeOffset: %4d, Exec: %3.2f\r", cell.id, ue_sync_get_cfo(&s)/1000, ue_sync_get_sfo(&s)/1000, pos, s.mean_exec_time); fflush(stdout); if (VERBOSE_ISINFO()) { printf("\n"); } } frame_cnt++; } printf("\nBye\n"); exit(0); }
/* Initializes the PSS synchronization object with fft_size=128 */ int pss_synch_init(pss_synch_t *q, uint32_t frame_size) { return pss_synch_init_fft(q, frame_size, 128); }