/** * * \section COPYRIGHT * * Copyright 2013-2014 The libLTE Developers. See the * COPYRIGHT file at the top-level directory of this distribution. * * \section LICENSE * * This file is part of the libLTE library. * * libLTE is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation, either version 3 of * the License, or (at your option) any later version. * * libLTE is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * A copy of the GNU Lesser General Public License can be found in * the LICENSE file in the top-level directory of this distribution * and at http://www.gnu.org/licenses/. * */ #include #include #include #include #include #include #include #include #include "liblte/phy/phy.h" #include "liblte/cuhd/cuhd.h" uint32_t N_id_2 = 100; char *uhd_args=""; float uhd_gain=40.0, uhd_freq=-1.0; int nof_frames = -1; uint32_t fft_size=64; float threshold = 0.4; void usage(char *prog) { printf("Usage: %s [agtvnp] -f rx_frequency_hz -i N_id_2\n", prog); printf("\t-a UHD args [Default %s]\n", uhd_args); printf("\t-g UHD Gain [Default %.2f dB]\n", uhd_gain); printf("\t-n nof_frames [Default %d]\n", nof_frames); printf("\t-s symbol_sz [Default %d]\n", fft_size); printf("\t-t threshold [Default %.2f]\n", threshold); printf("\t-v verbose\n"); } void parse_args(int argc, char **argv) { int opt; while ((opt = getopt(argc, argv, "agtvsfi")) != -1) { switch (opt) { case 'a': uhd_args = argv[optind]; break; case 'g': uhd_gain = atof(argv[optind]); break; case 'f': uhd_freq = atof(argv[optind]); break; case 't': threshold = atof(argv[optind]); break; case 'i': N_id_2 = atoi(argv[optind]); break; case 's': fft_size = atoi(argv[optind]); break; case 'n': nof_frames = atoi(argv[optind]); break; case 'v': verbose++; break; default: usage(argv[0]); exit(-1); } } if (N_id_2 > 2 || uhd_freq < 0) { usage(argv[0]); exit(-1); } } int main(int argc, char **argv) { cf_t *buffer; int frame_cnt, n; void *uhd; pss_synch_t pss; int32_t flen; int peak_idx, last_peak; float peak_value; float mean_peak; uint32_t nof_det, nof_nodet, nof_nopeak, nof_nopeakdet; parse_args(argc, argv); flen = 4800*(fft_size/64); buffer = malloc(sizeof(cf_t) * flen); if (!buffer) { perror("malloc"); exit(-1); } if (pss_synch_init_fft(&pss, flen, fft_size)) { fprintf(stderr, "Error initiating PSS\n"); exit(-1); } if (pss_synch_set_N_id_2(&pss, N_id_2)) { fprintf(stderr, "Error setting N_id_2=%d\n",N_id_2); exit(-1); } printf("Opening UHD device...\n"); if (cuhd_open(uhd_args, &uhd)) { fprintf(stderr, "Error opening uhd\n"); exit(-1); } printf("Set RX rate: %.2f MHz\n", cuhd_set_rx_srate(uhd, flen*2*100) / 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); 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; while(frame_cnt < nof_frames || nof_frames == -1) { n = cuhd_recv(uhd, buffer, flen, 1); if (n < 0) { fprintf(stderr, "Error receiving samples\n"); exit(-1); } peak_idx = pss_synch_find_pss(&pss, buffer, &peak_value); if (peak_idx < 0) { fprintf(stderr, "Error finding PSS peak\n"); exit(-1); } float y = sqrtf(crealf(vec_dot_prod_conj_ccc(&buffer[peak_idx-fft_size], &buffer[peak_idx-fft_size], fft_size)) / fft_size); float x = peak_value/y; mean_peak = VEC_CMA(x, mean_peak, frame_cnt); if (x >= threshold) { nof_det++; } else { nof_nodet++; } if (frame_cnt > 100) { if (abs(last_peak-peak_idx) > 10) { if (x >= threshold) { nof_nopeakdet++; } else { if (nof_nodet > 0) { nof_nodet--; } } nof_nopeak++; } } frame_cnt++; printf("[%5d]: Pos: %5d, En: %.4f Val: %.3f MeanVal: %.3f, Det: %.3f, No-Det: %.3f, NoPeak: %.3f, NoPeakDet: %.3f\r", frame_cnt, peak_idx, y, x, mean_peak, (float) nof_det/frame_cnt, (float) nof_nodet/frame_cnt, (float) nof_nopeak/frame_cnt, (float) nof_nopeakdet/nof_nopeak); if (VERBOSE_ISINFO()) { printf("\n"); } last_peak = peak_idx; } pss_synch_free(&pss); free(buffer); cuhd_close(uhd); printf("Ok\n"); exit(0); }