mirror of https://github.com/PentHertz/srsLTE.git
313 lines
7.9 KiB
C
313 lines
7.9 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 "srslte/srslte.h"
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#define MAX_CANDIDATES 64
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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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1, // nof_ports
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0, // bw_idx
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0, // cell_id
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SRSLTE_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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uint32_t cfi = 2;
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uint16_t rnti = SRSLTE_SIRNTI;
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int max_frames = 10;
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uint32_t sf_idx = 0;
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srslte_dci_format_t dci_format = SRSLTE_DCI_FORMAT1A;
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srslte_filesource_t fsrc;
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srslte_pdcch_t pdcch;
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srslte_pdsch_t pdsch;
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srslte_harq_t harq_process;
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cf_t *input_buffer, *fft_buffer, *ce[SRSLTE_MAX_PORTS];
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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 [rovfcenmps] -i input_file\n", prog);
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printf("\t-o DCI format [Default %s]\n", srslte_dci_format_string(dci_format));
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printf("\t-c cell.id [Default %d]\n", cell.id);
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printf("\t-s Start subframe_idx [Default %d]\n", sf_idx);
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printf("\t-f cfi [Default %d]\n", cfi);
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printf("\t-r rnti [Default 0x%x]\n",rnti);
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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-m max_frames [Default %d]\n", max_frames);
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printf("\t-e Set extended 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, "irovfcenmps")) != -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 's':
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sf_idx = atoi(argv[optind]);
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break;
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case 'r':
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rnti = strtoul(argv[optind], NULL, 0);
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break;
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case 'm':
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max_frames = strtoul(argv[optind], NULL, 0);
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break;
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case 'f':
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cfi = atoi(argv[optind]);
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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 'o':
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dci_format = srslte_dci_format_from_string(argv[optind]);
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if (dci_format == SRSLTE_DCI_FORMAT_ERROR) {
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fprintf(stderr, "Error unsupported format %s\n", argv[optind]);
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exit(-1);
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}
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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_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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flen = 2 * (SRSLTE_SLOT_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)) {
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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_tx_init(&fft, cell.cp, cell.nof_prb)) {
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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_regs_set_cfi(®s, cfi)) {
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fprintf(stderr, "Error setting CFI %d\n", cfi);
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return -1;
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}
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if (srslte_pdcch_init(&pdcch, ®s, cell)) {
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fprintf(stderr, "Error creating PDCCH object\n");
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exit(-1);
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}
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if (srslte_pdsch_init(&pdsch, cell)) {
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fprintf(stderr, "Error creating PDSCH object\n");
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exit(-1);
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}
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srslte_pdsch_set_rnti(&pdsch, rnti);
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if (srslte_harq_init(&harq_process, cell)) {
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fprintf(stderr, "Error initiating HARQ process\n");
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exit(-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<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_tx_free(&fft);
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srslte_pdcch_free(&pdcch);
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srslte_pdsch_free(&pdsch);
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srslte_harq_free(&harq_process);
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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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srslte_ra_pdsch_t ra_dl;
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int i;
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int nof_frames;
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int ret;
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uint8_t *data;
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srslte_dci_location_t locations[MAX_CANDIDATES];
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uint32_t nof_locations = 0;
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srslte_dci_msg_t dci_msg;
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data = malloc(100000);
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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 (rnti == SRSLTE_SIRNTI) {
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INFO("Initializing common search space for SI-RNTI\n",0);
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nof_locations = srslte_pdcch_common_locations(&pdcch, locations, MAX_CANDIDATES, cfi);
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}
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ret = -1;
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nof_frames = 0;
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do {
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srslte_filesource_read(&fsrc, input_buffer, flen);
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INFO("Reading %d samples sub-frame %d\n", flen, sf_idx);
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srslte_ofdm_tx_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, sf_idx);
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if (rnti != SRSLTE_SIRNTI) {
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INFO("Initializing user-specific search space for RNTI: 0x%x\n", rnti);
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nof_locations = srslte_pdcch_ue_locations(&pdcch, locations, MAX_CANDIDATES, sf_idx, cfi, rnti);
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}
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uint16_t srslte_crc_rem = 0;
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if (srslte_pdcch_extract_llr(&pdcch, fft_buffer, ce, srslte_chest_dl_get_noise_estimate(&chest), sf_idx, cfi)) {
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fprintf(stderr, "Error extracting LLRs\n");
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return -1;
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}
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for (i=0;i<nof_locations && srslte_crc_rem != rnti;i++) {
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if (srslte_pdcch_decode_msg(&pdcch, &dci_msg, &locations[i], dci_format, &srslte_crc_rem)) {
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fprintf(stderr, "Error decoding DCI msg\n");
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return -1;
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}
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}
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if (srslte_crc_rem == rnti) {
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if (srslte_dci_msg_to_ra_dl(&dci_msg, rnti, cell, cfi, &ra_dl)) {
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fprintf(stderr, "Error unpacking PDSCH scheduling DCI message\n");
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goto goout;
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}
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if (ra_dl.mcs.tbs > 0) {
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if (srslte_harq_setup_dl(&harq_process, ra_dl.mcs, ra_dl.rv_idx, sf_idx, &ra_dl.prb_alloc)) {
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fprintf(stderr, "Error configuring HARQ process\n");
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goto goout;
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}
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if (srslte_pdsch_decode(&pdsch, &harq_process, fft_buffer, ce, srslte_chest_dl_get_noise_estimate(&chest), data)) {
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fprintf(stderr, "Error decoding PDSCH\n");
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goto goout;
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} else {
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printf("PDSCH Decoded OK!\n");
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}
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} else {
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printf("Received DCI with no resource allocation\n");
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}
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sf_idx = (sf_idx+1)%10;
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}
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nof_frames++;
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} while (nof_frames <= max_frames);
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ret = 0;
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goout:
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base_free();
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exit(ret);
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}
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