mirror of https://github.com/pvnis/srsRAN_4G.git
Added PRACH test for USRP
ismagom
10 years ago
parent
d005ec8f9b
commit
104efa35ff
@ -0,0 +1,198 @@
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/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 The srsLTE Developers. See the
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* COPYRIGHT file at the top-level directory of this distribution.
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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/cuhd/cuhd.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 = 0;
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uint32_t nof_frames = 20;
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float uhd_gain=40, uhd_freq=2.4e9;
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char *uhd_args="";
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char *output_filename = NULL;
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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 TX/RX gain [Default %.1f dB]\n", uhd_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-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-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, "apfFgrsoz")) != -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_gain = 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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uint32_t flen = srslte_sampling_freq_hz(nof_prb)/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;
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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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void *uhd;
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printf("Opening UHD device...\n");
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if (cuhd_open(uhd_args, &uhd)) {
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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 TX/RX rate: %.2f MHz\n", cuhd_set_rx_srate(uhd, srslte_sampling_freq_hz(nof_prb)) / 1000000);
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printf("Set TX/RX gain: %.1f dB\n", cuhd_set_rx_gain(uhd, uhd_gain));
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printf("Set TX/RX freq: %.2f MHz\n", cuhd_set_rx_freq(uhd, uhd_freq) / 1000000);
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cuhd_set_tx_srate(uhd, srslte_sampling_freq_hz(nof_prb));
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cuhd_set_tx_gain(uhd, uhd_gain);
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cuhd_set_tx_freq(uhd, uhd_freq);
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cuhd_rx_wait_lo_locked(uhd);
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cf_t *zeros = calloc(sizeof(cf_t),flen);
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FILE *f = NULL;
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if (output_filename) {
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f = fopen(output_filename, "w");
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}
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srslte_timestamp_t tstamp;
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cuhd_start_rx_stream(uhd);
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uint32_t nframe=0;
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while(nframe<nof_frames) {
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cuhd_recv_with_time(uhd, &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);
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if (nframe==8) {
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cuhd_send_timed2(uhd, 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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cuhd_send_timed2(uhd, 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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printf("Rx subframe %d\n", nframe);
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}
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if (f) {
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fwrite(&buffer[10*flen], flen*sizeof(cf_t), 1, f);
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}
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if (f) {
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fclose(f);
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}
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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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