mirror of https://github.com/PentHertz/srsLTE.git
320 lines
6.9 KiB
C
320 lines
6.9 KiB
C
/**
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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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char *input_file_name = NULL;
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int nof_frames=100;
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float corr_peak_threshold=30;
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int force_N_id_2=-1;
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FILE *fmatlab;
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#define NOF_PORTS 2
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#define FLEN 9600
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filesource_t fsrc;
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cf_t *input_buffer, *fft_buffer, *ce[MAX_PORTS_CTRL];
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pbch_t pbch;
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lte_fft_t fft;
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chest_t chest;
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sync_t synch;
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void usage(char *prog) {
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printf("Usage: %s [onlt] -i input_file\n", prog);
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printf("\t-n number of frames [Default %d]\n", nof_frames);
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printf("\t-t correlation threshold [Default %g]\n", corr_peak_threshold);
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printf("\t-v [set verbose to debug, default none]\n");
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printf("\t-f force_N_id_2 [Default %d]\n", force_N_id_2);
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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, "intvf")) != -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 'n':
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nof_frames = atoi(argv[optind]);
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break;
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case 't':
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corr_peak_threshold = atof(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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case 'f':
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force_N_id_2 = 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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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 (filesource_init(&fsrc, input_file_name, 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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fmatlab = fopen("output.m", "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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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(CPNORM_NSYMB * 72 * 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<MAX_PORTS_CTRL;i++) {
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ce[i] = malloc(CPNORM_NSYMB * 72 * 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 (chest_init(&chest, LINEAR, CPNORM, 6, NOF_PORTS)) {
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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 (lte_fft_init(&fft, CPNORM, 6)) {
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fprintf(stderr, "Error initializing FFT\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_close() {
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int i;
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filesource_free(&fsrc);
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fclose(fmatlab);
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free(input_buffer);
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free(fft_buffer);
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sync_free(&synch);
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filesource_free(&fsrc);
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for (i=0;i<MAX_PORTS_CTRL;i++) {
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free(ce[i]);
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}
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chest_free(&chest);
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lte_fft_free(&fft);
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}
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int mib_decoder_init(int cell_id) {
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if (chest_ref_LTEDL(&chest, cell_id)) {
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fprintf(stderr, "Error initializing reference signal\n");
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return -1;
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}
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if (pbch_init(&pbch, cell_id, CPNORM)) {
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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("PBCH initiated cell_id=%d\n", cell_id);
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return 0;
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}
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int mib_decoder_run(cf_t *input, pbch_mib_t *mib) {
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int i, j;
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lte_fft_run(&fft, input, fft_buffer);
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fprintf(fmatlab, "outfft=");
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vec_sc_prod_cfc(fft_buffer, 1000.0, fft_buffer, 72 * 7);
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vec_fprint_c(fmatlab, fft_buffer, CP_NSYMB(CPNORM) * 6 * RE_X_RB);
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fprintf(fmatlab, ";\n");
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vec_sc_prod_cfc(fft_buffer, 0.001, fft_buffer, 72 * 7);
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/* Get channel estimates for each port */
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for (i=0;i<NOF_PORTS;i++) {
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chest_ce_slot_port(&chest, fft_buffer, ce[i], 1, i);
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chest_fprint(&chest, fmatlab, 1, i);
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for (j=0;j<CP_NSYMB(CPNORM);j++) {
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fprintf(fmatlab, "ce%d(%d,:)=", i, j + 1);
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vec_fprint_c(fmatlab, &ce[i][j * 6 * RE_X_RB], 6 * RE_X_RB);
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}
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}
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INFO("Decoding PBCH\n", 0);
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return pbch_decode(&pbch, fft_buffer, ce, 6, 1, mib);
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}
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int get_samples(int length, int offset) {
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int n = 0;
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if (length != -1 && offset != -1) {
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while(n < length) {
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INFO("Reading %d samples offset=%d\n", length - n, offset + n);
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n = filesource_read(&fsrc, &input_buffer[offset + n], length - n);
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if (n == -1) {
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fprintf(stderr, "Error reading %d samples from file\n", length - n);
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break;
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} else if (n == 0) {
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printf("End of file\n");
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return -1;
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}
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}
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return n;
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} else {
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return -1;
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}
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}
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enum radio_state { DONE, SYNC, MIB};
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int main(int argc, char **argv) {
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enum radio_state state;
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int mib_idx;
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int mib_attempts;
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pbch_mib_t mib;
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int cell_id, slot_id;
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int frame_cnt;
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float cfo;
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int read_samples;
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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 memory\n");
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exit(-1);
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}
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if (sync_init(&synch, FLEN)) {
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fprintf(stderr, "Error initiating PSS/SSS\n");
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exit(-1);
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}
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sync_force_N_id_2(&synch, force_N_id_2);
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sync_set_threshold(&synch, corr_peak_threshold);
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sync_pss_det_peakmean(&synch);
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state = SYNC;
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mib_idx = 0;
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mib_attempts = 0;
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frame_cnt = -1;
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cfo = 0.0;
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read_samples = FLEN;
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slot_id = 0;
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printf("\n\n-- Initiating MIB search --\n\n");
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while(frame_cnt < nof_frames) {
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if (get_samples(read_samples, 0) == -1) {
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fprintf(stderr, "Error reading %d samples\n", FLEN);
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break;
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}
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INFO("Correcting CFO=%.4f\n", cfo);
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nco_cexp_f_direct(input_buffer, -cfo/128, FLEN);
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switch(state) {
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case SYNC:
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INFO("State Sync, Slot idx=%d\n", frame_cnt);
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mib_idx = sync_run(&synch, input_buffer);
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if (mib_idx != -1) {
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cell_id = sync_get_cell_id(&synch);
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cfo = sync_get_cfo(&synch);
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slot_id = sync_get_slot_id(&synch);
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read_samples = 0;
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state = MIB;
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if (mib_decoder_init(cell_id)) {
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fprintf(stderr, "Error initiating MIB decoder\n");
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exit(-1);
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}
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INFO("SYNC done, cell_id=%d mib_idx=%d frame_idx=%d\n", cell_id, mib_idx, frame_cnt);
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}
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break;
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case MIB:
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if (!read_samples) {
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read_samples = FLEN;
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}
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INFO("State MIB, frame idx=%d MIB offset=%d slot_id=%d\n", frame_cnt, mib_idx, slot_id);
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if (slot_id == 0) {
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if (mib_decoder_run(&input_buffer[mib_idx], &mib)) {
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INFO("MIB detected attempt=%d\n", mib_attempts+1);
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state = DONE;
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} else {
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INFO("MIB not detected attempt=%d\n", mib_attempts+1);
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}
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mib_attempts++;
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slot_id = 10;
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} else {
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slot_id = 0;
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}
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break;
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case DONE:
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INFO("State Done after %d frames\n", frame_cnt);
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pbch_mib_fprint(stdout, &mib);
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frame_cnt = nof_frames;
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printf("Done\n");
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break;
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}
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frame_cnt++;
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}
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base_close();
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printf("Exit\n");
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exit(0);
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}
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