288 lines
7.1 KiB
C
288 lines
7.1 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/phy/common/phy_common.h>
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#include "srslte/srslte.h"
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char *input_file_name = NULL;
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char *matlab_file_name = NULL;
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srslte_cell_t cell = {
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50, // cell.nof_prb
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2, // cell.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 flen;
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int nof_ctrl_symbols = 1;
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int numsubframe = 0;
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FILE *fmatlab = NULL;
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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_phich_t phich;
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srslte_regs_t regs;
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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-o output matlab file name [Default Disabled]\n");
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printf("\t-c cell.id [Default %d]\n", cell.id);
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printf("\t-p cell.nof_ports [Default %d]\n", cell.nof_ports);
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printf("\t-n cell.nof_prb [Default %d]\n", cell.nof_prb);
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printf("\t-f nof control symbols [Default %d]\n", nof_ctrl_symbols);
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printf("\t-g phich ng factor: 1/6, 1/2, 1, 2 [Default 1]\n");
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printf("\t-e phich extended length [Default normal]\n");
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printf("\t-l extended cyclic prefix [Default normal]\n");
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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, "iovcenpfgl")) != -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 'o':
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matlab_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 'f':
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nof_ctrl_symbols = atoi(argv[optind]);
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break;
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case 'g':
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if (!strcmp(argv[optind], "1/6")) {
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cell.phich_resources = SRSLTE_PHICH_R_1_6;
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} else if (!strcmp(argv[optind], "1/2")) {
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cell.phich_resources = SRSLTE_PHICH_R_1_2;
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} else if (!strcmp(argv[optind], "1")) {
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cell.phich_resources = SRSLTE_PHICH_R_1;
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} else if (!strcmp(argv[optind], "2")) {
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cell.phich_resources = SRSLTE_PHICH_R_2;
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} else {
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fprintf(stderr, "Invalid phich ng factor %s. Setting to default.\n", argv[optind]);
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}
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break;
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case 'e':
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cell.phich_length = SRSLTE_PHICH_EXT;
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break;
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case 'n':
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cell.nof_prb = atoi(argv[optind]);
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break;
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case 'p':
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cell.nof_ports = 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 'l':
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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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if (matlab_file_name) {
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fmatlab = fopen(matlab_file_name, "w");
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if (!fmatlab) {
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perror("fopen");
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return -1;
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}
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} else {
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fmatlab = NULL;
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}
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flen = SRSLTE_SF_LEN(srslte_symbol_sz(cell.nof_prb));
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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<SRSLTE_MAX_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_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_regs_init(®s, cell)) {
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fprintf(stderr, "Error initiating regs\n");
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return -1;
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}
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if (srslte_phich_init(&phich)) {
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fprintf(stderr, "Error creating PBCH object\n");
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return -1;
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}
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if (srslte_phich_set_cell(&phich, ®s, cell)) {
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fprintf(stderr, "Error creating PBCH object\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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if (fmatlab) {
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fclose(fmatlab);
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}
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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<SRSLTE_MAX_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_phich_free(&phich);
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srslte_regs_free(®s);
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}
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int main(int argc, char **argv) {
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float distance;
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int n;
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uint32_t ngroup, nseq, max_nseq;
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uint8_t ack_rx;
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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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max_nseq = SRSLTE_CP_ISNORM(cell.cp)?SRSLTE_PHICH_NORM_NSEQUENCES:SRSLTE_PHICH_EXT_NSEQUENCES;
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if (base_init()) {
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fprintf(stderr, "Error initializing memory\n");
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exit(-1);
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}
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n = srslte_filesource_read(&fsrc, input_buffer, flen);
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srslte_ofdm_rx_sf(&fft, input_buffer, fft_buffer);
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if (fmatlab) {
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fprintf(fmatlab, "infft=");
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srslte_vec_fprint_c(fmatlab, input_buffer, flen);
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fprintf(fmatlab, ";\n");
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fprintf(fmatlab, "outfft=");
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srslte_vec_fprint_c(fmatlab, fft_buffer, SRSLTE_CP_NSYMB(cell.cp) * cell.nof_prb * SRSLTE_NRE);
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fprintf(fmatlab, ";\n");
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}
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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 PHICH\n", 0);
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/* Receive all PHICH groups and sequence numbers */
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for (ngroup=0;ngroup<srslte_phich_ngroups(&phich);ngroup++) {
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for (nseq=0;nseq<max_nseq;nseq++) {
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if (srslte_phich_decode(&phich, fft_buffer, ce, srslte_chest_dl_get_noise_estimate(&chest), ngroup, nseq, numsubframe, &ack_rx, &distance)<0) {
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printf("Error decoding ACK\n");
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exit(-1);
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}
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INFO("%d/%d, ack_rx: %d, ns: %d, distance: %f\n",
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ngroup, nseq, ack_rx, numsubframe, distance);
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}
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}
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base_free();
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if (n < 0) {
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fprintf(stderr, "Error decoding phich\n");
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exit(-1);
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} else if (n == 0) {
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printf("Could not decode phich\n");
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exit(-1);
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} else {
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exit(0);
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}
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}
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