254 lines
6.3 KiB
C
254 lines
6.3 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 <strings.h>
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#include <unistd.h>
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#include "srslte/srslte.h"
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char *input_file_name = NULL;
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srslte_cell_t cell = {
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6, // nof_prb
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2, // nof_ports
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150, // cell_id
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SRSLTE_CP_NORM, // cyclic prefix
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SRSLTE_PHICH_R_1, // PHICH resources
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SRSLTE_PHICH_NORM // PHICH length
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};
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int nof_frames = 1;
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uint8_t bch_payload_file[SRSLTE_BCH_PAYLOAD_LEN] = {0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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#define FLEN (10*SRSLTE_SF_LEN(srslte_symbol_sz(cell.nof_prb)))
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srslte_filesource_t fsrc;
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cf_t *input_buffer, *fft_buffer, *ce[SRSLTE_MAX_PORTS];
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srslte_pbch_t pbch;
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srslte_ofdm_t fft;
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srslte_chest_dl_t chest;
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void usage(char *prog) {
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printf("Usage: %s [vcoe] -i input_file\n", prog);
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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", cell.nof_prb);
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printf("\t-e Set extended prefix [Default Normal]\n");
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printf("\t-n nof_frames [Default %d]\n", nof_frames);
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printf("\t-v [set srslte_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, "ivcpne")) != -1) {
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switch(opt) {
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case 'i':
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input_file_name = 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 'p':
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cell.nof_prb = atoi(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 'v':
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srslte_verbose++;
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break;
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case 'e':
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cell.cp = SRSLTE_CP_EXT;
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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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if (!input_file_name) {
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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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int base_init() {
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int i;
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if (srslte_filesource_init(&fsrc, input_file_name, SRSLTE_COMPLEX_FLOAT_BIN)) {
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fprintf(stderr, "Error opening file %s\n", input_file_name);
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exit(-1);
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}
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input_buffer = malloc(FLEN * sizeof(cf_t));
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if (!input_buffer) {
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perror("malloc");
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exit(-1);
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}
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fft_buffer = malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
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if (!fft_buffer) {
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perror("malloc");
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return -1;
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}
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for (i=0;i<cell.nof_ports;i++) {
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ce[i] = malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
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if (!ce[i]) {
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perror("malloc");
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return -1;
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}
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}
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if (!srslte_cell_isvalid(&cell)) {
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fprintf(stderr, "Invalid cell properties\n");
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return -1;
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}
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if (srslte_chest_dl_init(&chest, cell.nof_prb)) {
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fprintf(stderr, "Error initializing equalizer\n");
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return -1;
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}
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if (srslte_chest_dl_set_cell(&chest, cell)) {
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fprintf(stderr, "Error initializing equalizer\n");
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return -1;
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}
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if (srslte_ofdm_init_(&fft, cell.cp, srslte_symbol_sz_power2(cell.nof_prb), cell.nof_prb, SRSLTE_DFT_FORWARD)) {
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fprintf(stderr, "Error initializing FFT\n");
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return -1;
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}
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if (srslte_pbch_init(&pbch)) {
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fprintf(stderr, "Error initiating PBCH\n");
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return -1;
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}
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if (srslte_pbch_set_cell(&pbch, cell)) {
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fprintf(stderr, "Error initiating PBCH\n");
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return -1;
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}
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DEBUG("Memory init OK\n",0);
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return 0;
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}
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void base_free() {
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int i;
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srslte_filesource_free(&fsrc);
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free(input_buffer);
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free(fft_buffer);
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srslte_filesource_free(&fsrc);
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for (i=0;i<cell.nof_ports;i++) {
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free(ce[i]);
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}
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srslte_chest_dl_free(&chest);
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srslte_ofdm_rx_free(&fft);
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srslte_pbch_free(&pbch);
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}
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int main(int argc, char **argv) {
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uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN];
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int n;
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uint32_t nof_tx_ports;
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int sfn_offset;
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cf_t *ce_slot1[SRSLTE_MAX_PORTS];
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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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parse_args(argc,argv);
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if (base_init()) {
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fprintf(stderr, "Error initializing receiver\n");
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exit(-1);
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}
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int frame_cnt = 0;
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int nof_decoded_mibs = 0;
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int nread = 0;
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do {
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nread = srslte_filesource_read(&fsrc, input_buffer, FLEN);
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if (nread > 0) {
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// process 1st subframe only
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srslte_ofdm_rx_sf(&fft, input_buffer, fft_buffer);
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/* Get channel estimates for each port */
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srslte_chest_dl_estimate(&chest, fft_buffer, ce, 0);
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INFO("Decoding PBCH\n", 0);
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for (int i=0;i<SRSLTE_MAX_PORTS;i++) {
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ce_slot1[i] = &ce[i][SRSLTE_SLOT_LEN_RE(cell.nof_prb, cell.cp)];
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}
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srslte_pbch_decode_reset(&pbch);
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n = srslte_pbch_decode(&pbch, &fft_buffer[SRSLTE_SLOT_LEN_RE(cell.nof_prb, cell.cp)],
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ce_slot1, srslte_chest_dl_get_noise_estimate(&chest),
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bch_payload, &nof_tx_ports, &sfn_offset);
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if (n == 1) {
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nof_decoded_mibs++;
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} else if (n < 0) {
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fprintf(stderr, "Error decoding PBCH\n");
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exit(-1);
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}
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frame_cnt++;
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} else if (nread < 0) {
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fprintf(stderr, "Error reading from file\n");
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exit(-1);
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}
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} while(nread > 0 && frame_cnt < nof_frames);
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base_free();
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if (frame_cnt == 1) {
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if (n == 0) {
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printf("Could not decode PBCH\n");
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exit(-1);
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} else {
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printf("MIB decoded OK. Nof ports: %d. SFN offset: %d Payload: ", nof_tx_ports, sfn_offset);
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srslte_vec_fprint_hex(stdout, bch_payload, SRSLTE_BCH_PAYLOAD_LEN);
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if (nof_tx_ports == 2 && sfn_offset == 0 && !memcmp(bch_payload, bch_payload_file, SRSLTE_BCH_PAYLOAD_LEN)) {
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printf("This is the signal.1.92M.dat file\n");
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exit(0);
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} else {
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printf("This is an unknown file\n");
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exit(-1);
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}
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}
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} else {
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printf("Decoded %d/%d MIBs\n", nof_decoded_mibs, frame_cnt);
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}
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}
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