mirror of https://github.com/PentHertz/srsLTE.git
238 lines
6.7 KiB
C
238 lines
6.7 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <math.h>
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#include <time.h>
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#include <complex.h>
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#include "srslte/rf/rf.h"
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#include "srslte/srslte.h"
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#define MAX_LEN 70176
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uint32_t nof_prb = 25;
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uint32_t preamble_format = 0;
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uint32_t root_seq_idx = 0;
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uint32_t seq_idx = 0;
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uint32_t frequency_offset = 0;
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uint32_t zero_corr_zone = 11;
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float timeadv = 0;
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uint32_t nof_frames = 20;
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float uhd_rx_gain=40, uhd_tx_gain=60, uhd_freq=2.4e9;
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char *uhd_args="";
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char *output_filename = "prach_rx";
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void usage(char *prog) {
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printf("Usage: %s \n", prog);
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printf("\t-a UHD args [Default %s]\n", uhd_args);
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printf("\t-f UHD TX/RX frequency [Default %.2f MHz]\n", uhd_freq/1e6);
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printf("\t-g UHD RX gain [Default %.1f dB]\n", uhd_rx_gain);
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printf("\t-G UHD TX gain [Default %.1f dB]\n", uhd_tx_gain);
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printf("\t-p Number of UL RB [Default %d]\n", nof_prb);
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printf("\t-F Preamble format [Default %d]\n", preamble_format);
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printf("\t-O Frequency offset [Default %d]\n", frequency_offset);
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printf("\t-s sequence index [Default %d]\n", seq_idx);
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printf("\t-r Root sequence index [Default %d]\n", root_seq_idx);
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printf("\t-t Time advance (us) [Default %.1f us]\n", timeadv);
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printf("\t-z Zero correlation zone config [Default %d]\n", zero_corr_zone);
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printf("\t-o Save transmitted PRACH in file [Default no]\n");
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}
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void parse_args(int argc, char **argv) {
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int opt;
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while ((opt = getopt(argc, argv, "apfFgGrstoPOz")) != -1) {
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switch (opt) {
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case 'a':
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uhd_args = argv[optind];
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break;
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case 'o':
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output_filename = argv[optind];
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break;
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case 'f':
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uhd_freq = atof(argv[optind]);
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break;
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case 'g':
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uhd_rx_gain = atof(argv[optind]);
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break;
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case 'G':
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uhd_tx_gain = atof(argv[optind]);
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break;
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case 'P':
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preamble_format = atoi(argv[optind]);
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break;
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case 'O':
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frequency_offset = atoi(argv[optind]);
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break;
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case 't':
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timeadv = atof(argv[optind]);
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break;
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case 'p':
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nof_prb = atoi(argv[optind]);
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if (!srslte_nofprb_isvalid(nof_prb)) {
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fprintf(stderr, "Invalid number of UL RB %d\n", nof_prb);
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exit(-1);
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}
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break;
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case 'F':
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preamble_format = atoi(argv[optind]);
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break;
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case 'r':
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root_seq_idx = atoi(argv[optind]);
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break;
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case 's':
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seq_idx = atoi(argv[optind]);
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break;
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case 'z':
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zero_corr_zone = atoi(argv[optind]);
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break;
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default:
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usage(argv[0]);
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exit(-1);
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}
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}
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}
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int main(int argc, char **argv) {
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parse_args(argc, argv);
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srslte_prach_t *p = (srslte_prach_t*)malloc(sizeof(srslte_prach_t));
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bool high_speed_flag = false;
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cf_t preamble[MAX_LEN];
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memset(preamble, 0, sizeof(cf_t)*MAX_LEN);
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srslte_prach_init(p,
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srslte_symbol_sz(nof_prb),
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preamble_format,
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root_seq_idx,
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high_speed_flag,
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zero_corr_zone);
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int srate = srslte_sampling_freq_hz(nof_prb);
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uint32_t flen = srate/1000;
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printf("Generating PRACH\n");
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bzero(preamble, flen*sizeof(cf_t));
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srslte_prach_gen(p,
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seq_idx,
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frequency_offset,
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preamble);
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uint32_t prach_len = p->N_seq+p->N_cp;
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srslte_vec_save_file("generated",preamble,prach_len*sizeof(cf_t));
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cf_t *buffer = malloc(sizeof(cf_t)*flen*nof_frames);
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// Send through UHD
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srslte_rf_t rf;
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printf("Opening RF device...\n");
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if (srslte_rf_open(&rf, uhd_args)) {
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fprintf(stderr, "Error opening &uhd\n");
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exit(-1);
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}
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printf("Subframe len: %d samples\n", flen);
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printf("Set RX gain: %.1f dB\n", uhd_rx_gain);
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printf("Set TX gain: %.1f dB\n", uhd_tx_gain);
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printf("Set TX/RX freq: %.2f MHz\n", uhd_freq/ 1000000);
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srslte_rf_set_rx_gain(&rf, uhd_rx_gain);
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srslte_rf_set_tx_gain(&rf, uhd_tx_gain);
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srslte_rf_set_rx_freq(&rf, uhd_freq);
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srslte_rf_set_tx_freq(&rf, uhd_freq);
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if (srate > 1e6) {
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if (30720%((int) srate/1000) == 0) {
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srslte_rf_set_master_clock_rate(&rf, 30.72e6);
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} else {
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srslte_rf_set_master_clock_rate(&rf, 23.04e6);
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}
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} else {
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printf("Invalid sampling rate %d Hz\n", srate);
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exit(-1);
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}
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printf("Setting sampling rate %.2f MHz\n", (float) srate/1000000);
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float srate_rf = srslte_rf_set_rx_srate(&rf, (double) srate);
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if (srate_rf != srate) {
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fprintf(stderr, "Could not set sampling rate\n");
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exit(-1);
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}
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srslte_rf_set_tx_srate(&rf, (double) srate);
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sleep(1);
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cf_t *zeros = calloc(sizeof(cf_t),flen);
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srslte_timestamp_t tstamp;
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srslte_rf_start_rx_stream(&rf);
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uint32_t nframe=0;
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while(nframe<nof_frames) {
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printf("Rx subframe %d\n", nframe);
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srslte_rf_recv_with_time(&rf, &buffer[flen*nframe], flen, true, &tstamp.full_secs, &tstamp.frac_secs);
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nframe++;
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if (nframe==9 || nframe==8) {
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srslte_timestamp_add(&tstamp, 0, 2e-3-timeadv*1e-6);
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if (nframe==8) {
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srslte_rf_send_timed2(&rf, zeros, flen, tstamp.full_secs, tstamp.frac_secs, true, false);
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printf("Transmitting zeros\n");
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} else {
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srslte_rf_send_timed2(&rf, preamble, flen, tstamp.full_secs, tstamp.frac_secs, false, true);
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printf("Transmitting PRACH\n");
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}
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}
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}
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uint32_t indices[1024];
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float offsets[1024];
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uint32_t nof_detected;
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if (srslte_prach_detect_offset(p, frequency_offset, &buffer[flen*10+p->N_cp], flen, indices, offsets, NULL, &nof_detected)) {
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printf("Error detecting prach\n");
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}
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printf("Nof detected PRACHs: %d\n", nof_detected);
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for (int i=0;i<nof_detected;i++) {
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printf("%d/%d index=%d, offset=%.2f us (%d samples)\n",
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i, nof_detected, indices[i], offsets[i]*1e6, (int) (offsets[i]*srate));
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}
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srslte_vec_save_file(output_filename,buffer,11*flen*sizeof(cf_t));
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srslte_prach_free(p);
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free(p);
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printf("Done\n");
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exit(0);
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}
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