311 lines
8.4 KiB
C
311 lines
8.4 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 <sys/time.h>
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#include "srslte/srslte.h"
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// Enable to measure execution time
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//#define DO_OFDM
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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, // cell_id
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SRSLTE_CP_NORM, // cyclic prefix
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SRSLTE_PHICH_R_1_6, // PHICH resources
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SRSLTE_PHICH_NORM // PHICH length
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};
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uint32_t cfi = 2;
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uint32_t mcs = 0;
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uint32_t subframe = 1;
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uint32_t rv_idx = 0;
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uint16_t rnti = 1234;
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char *input_file = NULL;
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void usage(char *prog) {
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printf("Usage: %s [fmcsrRFpnv] \n", prog);
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printf("\t-f read signal from file [Default generate it with pdsch_encode()]\n");
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printf("\t-m MCS [Default %d]\n", mcs);
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printf("\t-c cell id [Default %d]\n", cell.id);
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printf("\t-s subframe [Default %d]\n", subframe);
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printf("\t-r rv_idx [Default %d]\n", rv_idx);
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printf("\t-R rnti [Default %d]\n", rnti);
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printf("\t-F cfi [Default %d]\n", cfi);
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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-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, "fmcsrRFpnv")) != -1) {
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switch(opt) {
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case 'f':
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input_file = argv[optind];
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break;
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case 'm':
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mcs = atoi(argv[optind]);
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break;
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case 's':
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subframe = atoi(argv[optind]);
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break;
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case 'r':
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rv_idx = atoi(argv[optind]);
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break;
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case 'R':
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rnti = atoi(argv[optind]);
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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 'p':
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cell.nof_ports = 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 '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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srslte_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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}
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uint8_t *data = NULL;
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cf_t *ce[SRSLTE_MAX_PORTS];
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srslte_softbuffer_rx_t softbuffer_rx;
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srslte_ra_dl_grant_t grant;
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srslte_pdsch_cfg_t pdsch_cfg;
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cf_t *sf_symbols;
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cf_t *slot_symbols[SRSLTE_MAX_PORTS];
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srslte_pdsch_t pdsch;
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srslte_ofdm_t ofdm_tx, ofdm_rx;
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int main(int argc, char **argv) {
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uint32_t i, j;
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int ret = -1;
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struct timeval t[3];
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srslte_softbuffer_tx_t softbuffer_tx;
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parse_args(argc,argv);
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bzero(&pdsch, sizeof(srslte_pdsch_t));
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bzero(&pdsch_cfg, sizeof(srslte_pdsch_cfg_t));
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bzero(ce, sizeof(cf_t*)*SRSLTE_MAX_PORTS);
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bzero(slot_symbols, sizeof(cf_t*)*SRSLTE_MAX_PORTS);
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bzero(&softbuffer_rx, sizeof(srslte_softbuffer_rx_t));
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bzero(&softbuffer_tx, sizeof(srslte_softbuffer_tx_t));
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srslte_ra_dl_dci_t dci;
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bzero(&dci, sizeof(srslte_ra_dl_dci_t));
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dci.mcs_idx = mcs;
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dci.rv_idx = rv_idx;
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dci.type0_alloc.rbg_bitmask = 0xffffffff;
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dci.tb_en[0] = true;
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if (srslte_ra_dl_dci_to_grant(&dci, cell.nof_prb, rnti, &grant)) {
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fprintf(stderr, "Error computing resource allocation\n");
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return ret;
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}
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srslte_ofdm_tx_init(&ofdm_tx, cell.cp, cell.nof_prb);
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srslte_ofdm_rx_init(&ofdm_rx, cell.cp, cell.nof_prb);
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sf_symbols=srslte_vec_malloc(sizeof(cf_t)*SRSLTE_SF_LEN_PRB(cell.nof_prb));
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/* Configure PDSCH */
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if (srslte_pdsch_cfg(&pdsch_cfg, cell, &grant, cfi, subframe, rv_idx)) {
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fprintf(stderr, "Error configuring PDSCH\n");
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exit(-1);
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}
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/* init memory */
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for (i=0;i<SRSLTE_MAX_PORTS;i++) {
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ce[i] = srslte_vec_malloc(sizeof(cf_t) * SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp));
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if (!ce[i]) {
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perror("srslte_vec_malloc");
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goto quit;
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}
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for (j=0;j<SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp);j++) {
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ce[i][j] = 1;
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}
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slot_symbols[i] = srslte_vec_malloc(sizeof(cf_t)*SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp));
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if (!slot_symbols[i]) {
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perror("srslte_vec_malloc");
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goto quit;
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}
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}
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data = srslte_vec_malloc(sizeof(uint8_t) * (grant.mcs.tbs/8)+24);
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if (!data) {
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perror("srslte_vec_malloc");
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goto quit;
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}
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if (srslte_pdsch_init_ue(&pdsch, cell.nof_prb)) {
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fprintf(stderr, "Error creating PDSCH object\n");
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goto quit;
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}
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if (srslte_pdsch_set_cell(&pdsch, cell)) {
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fprintf(stderr, "Error creating PDSCH object\n");
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goto quit;
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}
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srslte_pdsch_set_rnti(&pdsch, rnti);
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if (srslte_softbuffer_rx_init(&softbuffer_rx, cell.nof_prb)) {
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fprintf(stderr, "Error initiating RX soft buffer\n");
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goto quit;
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}
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if (input_file) {
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srslte_filesource_t fsrc;
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if (srslte_filesource_init(&fsrc, input_file, SRSLTE_COMPLEX_FLOAT_BIN)) {
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fprintf(stderr, "Error opening file %s\n", input_file);
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exit(-1);
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}
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#ifdef DO_OFDM
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srslte_filesource_read(&fsrc, sf_symbols, SRSLTE_SF_LEN_PRB(cell.nof_prb));
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#else
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srslte_filesource_read(&fsrc, slot_symbols[0], SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp));
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#endif
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srslte_chest_dl_t chest;
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if (srslte_chest_dl_init(&chest, cell.nof_prb)) {
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printf("Error initializing equalizer\n");
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exit(-1);
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}
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if (srslte_chest_dl_set_cell(&chest, cell)) {
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printf("Error initializing equalizer\n");
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exit(-1);
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}
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srslte_chest_dl_estimate(&chest, slot_symbols[0], ce, subframe);
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srslte_chest_dl_free(&chest);
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srslte_filesource_free(&fsrc);
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} else {
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if (srslte_softbuffer_tx_init(&softbuffer_tx, cell.nof_prb)) {
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fprintf(stderr, "Error initiating TX soft buffer\n");
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goto quit;
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}
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for (i=0;i<grant.mcs.tbs/8;i++) {
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data[i] = rand()%256;
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}
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uint8_t databit[100000];
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srslte_bit_unpack_vector(data, databit, grant.mcs.tbs);
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srslte_vec_save_file("data_in", databit, grant.mcs.tbs);
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if (!input_file) {
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if (rv_idx) {
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/* Do 1st transmission for rv_idx!=0 */
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pdsch_cfg.rv = 0;
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if (srslte_pdsch_encode(&pdsch, &pdsch_cfg, &softbuffer_tx, data, rnti, slot_symbols)) {
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fprintf(stderr, "Error encoding PDSCH\n");
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goto quit;
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}
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}
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pdsch_cfg.rv = rv_idx;
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if (srslte_pdsch_encode(&pdsch, &pdsch_cfg, &softbuffer_tx, data, rnti, slot_symbols)) {
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fprintf(stderr, "Error encoding PDSCH\n");
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goto quit;
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}
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}
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/* combine outputs */
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for (i=0;i<cell.nof_ports;i++) {
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for (j=0;j<SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp);j++) {
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if (i > 0) {
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slot_symbols[0][j] += slot_symbols[i][j];
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}
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ce[i][j] = 1;
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}
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}
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#ifdef DO_OFDM
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srslte_ofdm_tx_sf(&ofdm_tx, slot_symbols[0], sf_symbols);
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#endif
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}
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int M=1;
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int r=0;
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srslte_sch_set_max_noi(&pdsch.dl_sch, 10);
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gettimeofday(&t[1], NULL);
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for (i=0;i<M;i++) {
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#ifdef DO_OFDM
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srslte_ofdm_rx_sf(&ofdm_rx, sf_symbols, slot_symbols[1]);
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#endif
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srslte_softbuffer_rx_reset_tbs(&softbuffer_rx, grant.mcs.tbs);
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r = srslte_pdsch_decode(&pdsch, &pdsch_cfg, &softbuffer_rx, slot_symbols[0], ce, 0, rnti, data);
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}
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gettimeofday(&t[2], NULL);
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get_time_interval(t);
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printf("DECODED %s in %.2f (PHY bitrate=%.2f Mbps. Processing bitrate=%.2f Mbps)\n", r?"Error":"OK",
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(float) t[0].tv_usec/M, (float) grant.mcs.tbs/1000, (float) grant.mcs.tbs*M/t[0].tv_usec);
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if (r) {
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ret = -1;
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goto quit;
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}
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ret = 0;
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quit:
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srslte_pdsch_free(&pdsch);
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srslte_softbuffer_tx_free(&softbuffer_tx);
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srslte_softbuffer_rx_free(&softbuffer_rx);
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for (i=0;i<cell.nof_ports;i++) {
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if (ce[i]) {
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free(ce[i]);
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}
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if (slot_symbols[i]) {
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free(slot_symbols[i]);
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}
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}
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if (data) {
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free(data);
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}
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if (ret) {
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printf("Error\n");
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} else {
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printf("Ok\n");
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}
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exit(ret);
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}
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