void srslte_sync_free(srslte_sync_t *q) { if (q) { srslte_pss_synch_free(&q->pss); srslte_sss_synch_free(&q->sss); srslte_cfo_free(&q->cfocorr); srslte_cp_synch_free(&q->cp_synch); for (int i=0;i<2;i++) { if (q->cfo_i_corr[i]) { free(q->cfo_i_corr[i]); } srslte_pss_synch_free(&q->pss_i[i]); } } }
void srslte_sync_free(srslte_sync_t *q) { if (q) { srslte_pss_synch_free(&q->pss); srslte_sss_synch_free(&q->sss); srslte_cfo_free(&q->cfocorr); } }
/* the gateway function */ void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) { srslte_cell_t cell; srslte_pss_synch_t pss; cf_t *input_symbols; int frame_len; if (nrhs < NOF_INPUTS) { help(); return; } srslte_use_standard_symbol_size(true); if (mexutils_read_cell(ENBCFG, &cell)) { help(); return; } /* Allocate input buffers */ frame_len = mexutils_read_cf(INPUT, &input_symbols); if (frame_len < 0) { mexErrMsgTxt("Error reading input symbols\n"); return; } if (nrhs == NOF_INPUTS+1) { frame_len = (int) mxGetScalar(prhs[NOF_INPUTS]); } if (srslte_pss_synch_init_fft(&pss, frame_len, srslte_symbol_sz(cell.nof_prb))) { fprintf(stderr, "Error initiating PSS\n"); exit(-1); } if (srslte_pss_synch_set_N_id_2(&pss, cell.id%3)) { fprintf(stderr, "Error setting N_id_2=%d\n",cell.id%3); exit(-1); } srslte_pss_synch_set_ema_alpha(&pss, 1.0); int peak_idx = srslte_pss_synch_find_pss(&pss, input_symbols, NULL); if (nlhs >= 1) { plhs[0] = mxCreateDoubleScalar(peak_idx); } if (nlhs >= 2) { mexutils_write_cf(pss.conv_output, &plhs[1], frame_len, 1); } srslte_pss_synch_free(&pss); free(input_symbols); return; }
/* Initializes the PSS synchronization object. * * It correlates a signal of frame_size samples with the PSS sequence in the frequency * domain. The PSS sequence is transformed using fft_size samples. */ int srslte_pss_synch_init_fft_offset(srslte_pss_synch_t *q, uint32_t frame_size, uint32_t fft_size, int offset) { int ret = SRSLTE_ERROR_INVALID_INPUTS; if (q != NULL) { uint32_t N_id_2; uint32_t buffer_size; bzero(q, sizeof(srslte_pss_synch_t)); q->N_id_2 = 10; q->fft_size = fft_size; q->frame_size = frame_size; q->ema_alpha = 0.1; buffer_size = fft_size + frame_size + 1; if (srslte_dft_plan(&q->dftp_input, fft_size, SRSLTE_DFT_FORWARD, SRSLTE_DFT_COMPLEX)) { fprintf(stderr, "Error creating DFT plan \n"); goto clean_and_exit; } srslte_dft_plan_set_mirror(&q->dftp_input, true); srslte_dft_plan_set_dc(&q->dftp_input, true); srslte_dft_plan_set_norm(&q->dftp_input, true); q->tmp_input = srslte_vec_malloc(buffer_size * sizeof(cf_t)); if (!q->tmp_input) { fprintf(stderr, "Error allocating memory\n"); goto clean_and_exit; } bzero(&q->tmp_input[q->frame_size], q->fft_size * sizeof(cf_t)); q->conv_output = srslte_vec_malloc(buffer_size * sizeof(cf_t)); if (!q->conv_output) { fprintf(stderr, "Error allocating memory\n"); goto clean_and_exit; } bzero(q->conv_output, sizeof(cf_t) * buffer_size); q->conv_output_avg = srslte_vec_malloc(buffer_size * sizeof(float)); if (!q->conv_output_avg) { fprintf(stderr, "Error allocating memory\n"); goto clean_and_exit; } bzero(q->conv_output_avg, sizeof(float) * buffer_size); #ifdef SRSLTE_PSS_ACCUMULATE_ABS q->conv_output_abs = srslte_vec_malloc(buffer_size * sizeof(float)); if (!q->conv_output_abs) { fprintf(stderr, "Error allocating memory\n"); goto clean_and_exit; } bzero(q->conv_output_abs, sizeof(float) * buffer_size); #endif for (N_id_2=0;N_id_2<3;N_id_2++) { q->pss_signal_time[N_id_2] = srslte_vec_malloc(buffer_size * sizeof(cf_t)); if (!q->pss_signal_time[N_id_2]) { fprintf(stderr, "Error allocating memory\n"); goto clean_and_exit; } /* The PSS is translated into the time domain for each N_id_2 */ if (srslte_pss_synch_init_N_id_2(q->pss_signal_freq[N_id_2], q->pss_signal_time[N_id_2], N_id_2, fft_size, offset)) { fprintf(stderr, "Error initiating PSS detector for N_id_2=%d fft_size=%d\n", N_id_2, fft_size); goto clean_and_exit; } bzero(&q->pss_signal_time[N_id_2][q->fft_size], q->frame_size * sizeof(cf_t)); } #ifdef CONVOLUTION_FFT if (srslte_conv_fft_cc_init(&q->conv_fft, frame_size, fft_size)) { fprintf(stderr, "Error initiating convolution FFT\n"); goto clean_and_exit; } #endif srslte_pss_synch_reset(q); ret = SRSLTE_SUCCESS; } clean_and_exit: if (ret == SRSLTE_ERROR) { srslte_pss_synch_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); }