mirror of https://github.com/pvnis/srsRAN_4G.git
Moved PDSCH examples
ismagom
11 years ago
parent
b4e625eddd
commit
88d961e169
@ -1,283 +0,0 @@
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/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2014 The libLTE 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 libLTE library.
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*
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* libLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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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* libLTE 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 Lesser General Public License for more details.
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*
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* A copy of the GNU Lesser 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 <strings.h>
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#include <unistd.h>
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#include "lte.h"
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#ifndef DISABLE_UHD
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#include "cuhd.h"
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void *uhd;
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#endif
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char *output_file_name = NULL;
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int nof_frames=-1;
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int cell_id = 1;
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int nof_prb = 6;
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char *uhd_args = "";
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float uhd_amp=0.25, uhd_gain=10.0, uhd_freq=2400000000;
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filesink_t fsink;
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lte_fft_t ifft;
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pbch_t pbch;
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cf_t *slot_buffer = NULL, *output_buffer = NULL;
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int slot_n_re, slot_n_samples;
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#define UHD_SAMP_FREQ 1920000
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void usage(char *prog) {
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printf("Usage: %s [agmfoncvp]\n", prog);
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#ifndef DISABLE_UHD
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printf("\t-a UHD args [Default %s]\n", uhd_args);
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printf("\t-g UHD TX gain [Default %.2f dB]\n", uhd_gain);
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printf("\t-m UHD signal amplitude [Default %.2f]\n", uhd_amp);
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printf("\t-f UHD TX frequency [Default %.1f MHz]\n", uhd_freq/1000000);
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#else
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printf("\t UHD is disabled. CUHD library not available\n");
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#endif
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printf("\t-o output_file [Default USRP]\n");
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printf("\t-n number of frames [Default %d]\n", nof_frames);
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printf("\t-c cell id [Default %d]\n", cell_id);
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printf("\t-p nof_prb [Default %d]\n", nof_prb);
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printf("\t-v [set verbose to debug, default none]\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, "agfmoncpv")) != -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 'g':
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uhd_gain = atof(argv[optind]);
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break;
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case 'm':
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uhd_amp = atof(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 'o':
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output_file_name = argv[optind];
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break;
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case 'n':
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nof_frames = atoi(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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break;
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case 'c':
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cell_id = atoi(argv[optind]);
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break;
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case 'v':
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verbose++;
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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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#ifdef DISABLE_UHD
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if (!output_file_name) {
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usage(argv[0]);
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exit(-1);
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}
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#endif
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}
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void base_init() {
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/* init memory */
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slot_buffer = malloc(sizeof(cf_t) * slot_n_re);
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if (!slot_buffer) {
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perror("malloc");
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exit(-1);
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}
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output_buffer = malloc(sizeof(cf_t) * slot_n_samples);
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if (!output_buffer) {
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perror("malloc");
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exit(-1);
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}
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/* open file or USRP */
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if (output_file_name) {
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if (filesink_init(&fsink, output_file_name, COMPLEX_FLOAT_BIN)) {
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fprintf(stderr, "Error opening file %s\n", output_file_name);
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exit(-1);
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}
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} else {
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#ifndef DISABLE_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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#else
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printf("Error UHD not available. Select an output file\n");
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exit(-1);
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#endif
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}
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/* create ifft object */
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if (lte_ifft_init(&ifft, CPNORM, nof_prb)) {
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fprintf(stderr, "Error creating iFFT object\n");
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exit(-1);
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}
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if (pbch_init(&pbch, 6, cell_id, CPNORM)) {
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fprintf(stderr, "Error creating PBCH object\n");
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exit(-1);
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}
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}
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void base_free() {
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pbch_free(&pbch);
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lte_ifft_free(&ifft);
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if (slot_buffer) {
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free(slot_buffer);
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}
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if (output_buffer) {
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free(output_buffer);
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}
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if (output_file_name) {
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filesink_free(&fsink);
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} else {
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#ifndef DISABLE_UHD
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cuhd_close(&uhd);
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#endif
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}
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}
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int main(int argc, char **argv) {
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int nf, ns, N_id_2;
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cf_t pss_signal[PSS_LEN];
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float sss_signal0[SSS_LEN]; // for subframe 0
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float sss_signal5[SSS_LEN]; // for subframe 5
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pbch_mib_t mib;
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refsignal_t refs[NSLOTS_X_FRAME];
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int i;
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cf_t *slot1_symbols[MAX_PORTS_CTRL];
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#ifdef DISABLE_UHD
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if (argc < 3) {
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usage(argv[0]);
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exit(-1);
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}
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#endif
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parse_args(argc,argv);
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N_id_2 = cell_id%3;
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slot_n_re = CPNORM_NSYMB * nof_prb * RE_X_RB;
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slot_n_samples = SLOT_LEN_CPNORM(lte_symbol_sz(nof_prb));
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/* this *must* be called after setting slot_len_* */
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base_init();
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/* Generate PSS/SSS signals */
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pss_generate(pss_signal, N_id_2);
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sss_generate(sss_signal0, sss_signal5, cell_id);
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/* Generate CRS signals */
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for (i=0;i<NSLOTS_X_FRAME;i++) {
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if (refsignal_init_LTEDL(&refs[i], 0, i, cell_id, CPNORM, nof_prb)) {
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fprintf(stderr, "Error initiating CRS slot=%d\n", i);
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return -1;
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}
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}
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mib.nof_ports = 1;
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mib.nof_prb = 6;
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mib.phich_length = PHICH_NORM;
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mib.phich_resources = R_1;
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mib.sfn = 0;
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for (i=0;i<MAX_PORTS_CTRL;i++) { // now there's only 1 port
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slot1_symbols[i] = slot_buffer;
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}
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#ifndef DISABLE_UHD
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if (!output_file_name) {
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printf("Set TX rate: %.2f MHz\n", cuhd_set_tx_srate(uhd, UHD_SAMP_FREQ)/1000000);
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printf("Set TX gain: %.1f dB\n", cuhd_set_tx_gain(uhd, uhd_gain));
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printf("Set TX freq: %.2f MHz\n", cuhd_set_tx_freq(uhd, uhd_freq)/1000000);
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}
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#endif
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nf = 0;
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while(nf<nof_frames || nof_frames == -1) {
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for (ns=0;ns<NSLOTS_X_FRAME;ns++) {
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bzero(slot_buffer, sizeof(cf_t) * slot_n_re);
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switch(ns) {
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case 0: // tx pss/sss
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case 10: // tx pss/sss
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pss_put_slot(pss_signal, slot_buffer, nof_prb, CPNORM);
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sss_put_slot(ns?sss_signal5:sss_signal0, slot_buffer, nof_prb, CPNORM);
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break;
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case 1: // tx pbch
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pbch_encode(&pbch, &mib, slot1_symbols, 1);
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break;
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default: // transmit zeros
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break;
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}
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refsignal_put(&refs[ns], slot_buffer);
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/* Transform to OFDM symbols */
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lte_ifft_run(&ifft, slot_buffer, output_buffer);
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/* send to file or usrp */
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if (output_file_name) {
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filesink_write(&fsink, output_buffer, slot_n_samples);
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usleep(5000);
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} else {
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#ifndef DISABLE_UHD
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vec_sc_prod_cfc(output_buffer, uhd_amp, output_buffer, slot_n_samples);
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cuhd_send(uhd, output_buffer, slot_n_samples, 1);
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#endif
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}
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}
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mib.sfn=(mib.sfn+1)%1024;
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printf("SFN: %4d\r", mib.sfn);fflush(stdout);
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nf++;
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}
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base_free();
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printf("Done\n");
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exit(0);
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}
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