int srslte_sss_synch_initialize(srslte_sss_synch_hl* h) { if (srslte_sss_synch_init(&h->obj, 128)) { return SRSLTE_ERROR; } srslte_sss_synch_set_N_id_2(&h->obj, h->init.N_id_2); return SRSLTE_SUCCESS; }
int srslte_sync_init(srslte_sync_t *q, uint32_t frame_size, uint32_t fft_size) { int ret = SRSLTE_ERROR_INVALID_INPUTS; if (q != NULL && frame_size <= 307200 && fft_size_isvalid(fft_size)) { ret = SRSLTE_ERROR; bzero(q, sizeof(srslte_sync_t)); q->detect_cp = true; q->cp = SRSLTE_CP_NORM; 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 (srslte_pss_synch_init_fft(&q->pss, frame_size, fft_size)) { fprintf(stderr, "Error initializing PSS object\n"); goto clean_exit; } if (srslte_sss_synch_init(&q->sss, fft_size)) { fprintf(stderr, "Error initializing SSS object\n"); goto clean_exit; } if (srslte_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 = SRSLTE_SUCCESS; } else { fprintf(stderr, "Invalid parameters frame_size: %d, fft_size: %d\n", frame_size, fft_size); } clean_exit: if (ret == SRSLTE_ERROR) { srslte_sync_free(q); } return ret; }
int srslte_sync_init(srslte_sync_t *q, uint32_t frame_size, uint32_t max_offset, uint32_t fft_size) { int ret = SRSLTE_ERROR_INVALID_INPUTS; if (q != NULL && frame_size <= 307200 && fft_size_isvalid(fft_size)) { ret = SRSLTE_ERROR; bzero(q, sizeof(srslte_sync_t)); q->detect_cp = true; q->mean_peak_value = 0.0; q->sss_en = true; q->mean_cfo = 0; q->N_id_2 = 1000; q->N_id_1 = 1000; q->cfo_i = 0; q->find_cfo_i = false; q->find_cfo_i_initiated = false; q->cfo_ema_alpha = CFO_EMA_ALPHA; q->fft_size = fft_size; q->frame_size = frame_size; q->max_offset = max_offset; q->sss_alg = SSS_PARTIAL_3; q->enable_cfo_corr = true; for (int i=0;i<2;i++) { q->cfo_i_corr[i] = srslte_vec_malloc(sizeof(cf_t)*q->frame_size); if (!q->cfo_i_corr[i]) { perror("malloc"); goto clean_exit; } } srslte_sync_set_cp(q, SRSLTE_CP_NORM); if (srslte_pss_synch_init_fft(&q->pss, max_offset, fft_size)) { fprintf(stderr, "Error initializing PSS object\n"); goto clean_exit; } if (srslte_sss_synch_init(&q->sss, fft_size)) { fprintf(stderr, "Error initializing SSS object\n"); goto clean_exit; } if (srslte_cfo_init(&q->cfocorr, frame_size)) { fprintf(stderr, "Error initiating CFO\n"); goto clean_exit; } if (srslte_cp_synch_init(&q->cp_synch, fft_size)) { fprintf(stderr, "Error initiating CFO\n"); goto clean_exit; } DEBUG("SYNC init with frame_size=%d, max_offset=%d and fft_size=%d\n", frame_size, max_offset, fft_size); ret = SRSLTE_SUCCESS; } else { fprintf(stderr, "Invalid parameters frame_size: %d, fft_size: %d\n", frame_size, fft_size); } clean_exit: if (ret == SRSLTE_ERROR) { srslte_sync_free(q); } return ret; }
int main(int argc, char **argv) { cf_t *buffer; int frame_cnt, n; void *uhd; srslte_pss_synch_t pss; srslte_cfo_t cfocorr, cfocorr64; srslte_sss_synch_t sss; int32_t flen; int peak_idx, last_peak; float peak_value; float mean_peak; uint32_t nof_det, nof_nodet, nof_nopeak, nof_nopeakdet; cf_t ce[SRSLTE_PSS_LEN]; 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_1 = cell_id/3; #ifndef DISABLE_GRAPHICS if (!disable_plots) init_plots(); #endif float srate = 15000.0*fft_size; flen = srate*5/1000; printf("Opening UHD device...\n"); if (cuhd_open(uhd_args, &uhd)) { fprintf(stderr, "Error opening uhd\n"); exit(-1); } if (srate < 10e6) { cuhd_set_master_clock_rate(uhd, 4*srate); } else { cuhd_set_master_clock_rate(uhd, srate); } printf("Set RX rate: %.2f MHz\n", cuhd_set_rx_srate(uhd, srate) / 1000000); printf("Set RX gain: %.1f dB\n", cuhd_set_rx_gain(uhd, uhd_gain)); printf("Set RX freq: %.2f MHz\n", cuhd_set_rx_freq(uhd, uhd_freq) / 1000000); cuhd_rx_wait_lo_locked(uhd); buffer = malloc(sizeof(cf_t) * flen * 2); if (!buffer) { perror("malloc"); exit(-1); } if (srslte_pss_synch_init_fft(&pss, flen, fft_size)) { fprintf(stderr, "Error initiating PSS\n"); exit(-1); } if (srslte_pss_synch_set_N_id_2(&pss, N_id_2_sync)) { fprintf(stderr, "Error setting N_id_2=%d\n",N_id_2_sync); exit(-1); } srslte_cfo_init(&cfocorr, flen); srslte_cfo_init(&cfocorr64, flen); if (srslte_sss_synch_init(&sss, fft_size)) { fprintf(stderr, "Error initializing SSS object\n"); return SRSLTE_ERROR; } srslte_sss_synch_set_N_id_2(&sss, N_id_2); printf("N_id_2: %d\n", N_id_2); cuhd_start_rx_stream(uhd); printf("Frame length %d samples\n", flen); printf("PSS detection threshold: %.2f\n", threshold); nof_det = nof_nodet = nof_nopeak = nof_nopeakdet = 0; frame_cnt = 0; last_peak = 0; mean_peak = 0; int peak_offset = 0; float cfo; float mean_cfo = 0; uint32_t m0, m1; uint32_t sss_error1 = 0, sss_error2 = 0, sss_error3 = 0; uint32_t cp_is_norm = 0; srslte_sync_t ssync; bzero(&ssync, sizeof(srslte_sync_t)); ssync.fft_size = fft_size; while(frame_cnt < nof_frames || nof_frames == -1) { n = cuhd_recv(uhd, buffer, flen - peak_offset, 1); if (n < 0) { fprintf(stderr, "Error receiving samples\n"); exit(-1); } peak_idx = srslte_pss_synch_find_pss(&pss, buffer, &peak_value); if (peak_idx < 0) { fprintf(stderr, "Error finding PSS peak\n"); exit(-1); } mean_peak = SRSLTE_VEC_CMA(peak_value, mean_peak, frame_cnt); if (peak_value >= threshold) { nof_det++; if (peak_idx >= fft_size) { // Estimate CFO cfo = srslte_pss_synch_cfo_compute(&pss, &buffer[peak_idx-fft_size]); mean_cfo = SRSLTE_VEC_CMA(cfo, mean_cfo, frame_cnt); // Correct CFO srslte_cfo_correct(&cfocorr, buffer, buffer, -mean_cfo / fft_size); // Estimate channel if (srslte_pss_synch_chest(&pss, &buffer[peak_idx-fft_size], ce)) { fprintf(stderr, "Error computing channel estimation\n"); exit(-1); } // Find SSS int sss_idx = peak_idx-2*fft_size-(SRSLTE_CP_ISNORM(cp)?SRSLTE_CP_LEN(fft_size, SRSLTE_CP_NORM_LEN):SRSLTE_CP_LEN(fft_size, SRSLTE_CP_EXT_LEN)); if (sss_idx >= 0 && sss_idx < flen-fft_size) { srslte_sss_synch_m0m1_partial(&sss, &buffer[sss_idx], 3, NULL, &m0, &m0_value, &m1, &m1_value); if (srslte_sss_synch_N_id_1(&sss, m0, m1) != N_id_1) { sss_error2++; } INFO("Partial N_id_1: %d\n", srslte_sss_synch_N_id_1(&sss, m0, m1)); srslte_sss_synch_m0m1_diff(&sss, &buffer[sss_idx], &m0, &m0_value, &m1, &m1_value); if (srslte_sss_synch_N_id_1(&sss, m0, m1) != N_id_1) { sss_error3++; } INFO("Diff N_id_1: %d\n", srslte_sss_synch_N_id_1(&sss, m0, m1)); srslte_sss_synch_m0m1_partial(&sss, &buffer[sss_idx], 1, NULL, &m0, &m0_value, &m1, &m1_value); if (srslte_sss_synch_N_id_1(&sss, m0, m1) != N_id_1) { sss_error1++; } INFO("Full N_id_1: %d\n", srslte_sss_synch_N_id_1(&sss, m0, m1)); } // Estimate CP if (peak_idx > 2*(fft_size + SRSLTE_CP_LEN_EXT(fft_size))) { srslte_cp_t cp = srslte_sync_detect_cp(&ssync, buffer, peak_idx); if (SRSLTE_CP_ISNORM(cp)) { cp_is_norm++; } } } else { INFO("No space for CFO computation. Frame starts at \n",peak_idx); } if(srslte_sss_synch_subframe(m0,m1) == 0) { #ifndef DISABLE_GRAPHICS if (!disable_plots) do_plots_sss(sss.corr_output_m0, sss.corr_output_m1); #endif } } else { nof_nodet++; } if (frame_cnt > 100) { if (abs(last_peak-peak_idx) > 4) { if (peak_value >= threshold) { nof_nopeakdet++; } nof_nopeak++; } } frame_cnt++; printf("[%5d]: Pos: %5d, PSR: %4.1f (~%4.1f) Pdet: %4.2f, " "FA: %4.2f, CFO: %+4.1f KHz SSSmiss: %4.2f/%4.2f/%4.2f CPNorm: %.0f%%\r", frame_cnt, peak_idx, peak_value, mean_peak, (float) nof_det/frame_cnt, (float) nof_nopeakdet/frame_cnt, mean_cfo*15, (float) sss_error1/nof_det,(float) sss_error2/nof_det,(float) sss_error3/nof_det, (float) cp_is_norm/nof_det * 100); if (SRSLTE_VERBOSE_ISINFO()) { printf("\n"); } #ifndef DISABLE_GRAPHICS if (!disable_plots) do_plots(pss.conv_output_avg, pss.conv_output_avg[peak_idx], pss.fft_size+pss.frame_size-1, ce); #endif last_peak = peak_idx; } srslte_pss_synch_free(&pss); free(buffer); cuhd_close(uhd); printf("Ok\n"); exit(0); }