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264 lines
6.9 KiB
C
264 lines
6.9 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 The srsLTE 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 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/select.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include "srslte/srslte.h"
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#include "srslte/cuhd/cuhd.h"
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void *uhd;
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char *output_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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1, // 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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char *uhd_args = "";
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float uhd_amp = 0.5, uhd_gain = 30.0, uhd_freq = 2400000000;
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bool null_file_sink=false;
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srslte_filesink_t fsink;
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srslte_ofdm_t ifft;
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srslte_mod_t modulation;
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uint32_t sf_n_re, sf_n_samples;
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cf_t *sf_buffer = NULL, *output_buffer = NULL;
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void usage(char *prog) {
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printf("Usage: %s [algfmv]\n", prog);
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printf("\t-a UHD args [Default %s]\n", uhd_args);
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printf("\t-l UHD amplitude [Default %.2f]\n", uhd_amp);
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printf("\t-g UHD TX gain [Default %.2f dB]\n", uhd_gain);
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printf("\t-f UHD TX frequency [Default %.1f MHz]\n", uhd_freq / 1000000);
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printf("\t-m modulation (1: BPSK, 2: QPSK, 3: QAM16, 4: QAM64) [Default BPSK]\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, "algfmv")) != -1) {
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switch (opt) {
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case 'a':
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uhd_args = argv[optind];
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break;
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case 'g':
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uhd_gain = atof(argv[optind]);
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break;
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case 'l':
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uhd_amp = atof(argv[optind]);
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break;
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case 'f':
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uhd_freq = atof(argv[optind]);
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break;
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case 'm':
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switch(atoi(argv[optind])) {
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case 1:
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modulation = SRSLTE_MOD_BPSK;
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break;
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case 2:
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modulation = SRSLTE_MOD_QPSK;
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break;
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case 4:
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modulation = SRSLTE_MOD_16QAM;
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break;
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case 6:
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modulation = SRSLTE_MOD_64QAM;
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break;
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default:
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fprintf(stderr, "Invalid modulation %d. Possible values: "
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"(1: BPSK, 2: QPSK, 3: QAM16, 4: QAM64)\n", atoi(argv[optind]));
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break;
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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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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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#ifdef DISABLE_UHD
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if (!output_file_name) {
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usage(argv[0]);
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exit(-1);
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}
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#endif
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}
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void base_init() {
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/* init memory */
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sf_buffer = malloc(sizeof(cf_t) * sf_n_re);
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if (!sf_buffer) {
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perror("malloc");
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exit(-1);
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}
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output_buffer = malloc(sizeof(cf_t) * sf_n_samples);
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if (!output_buffer) {
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perror("malloc");
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exit(-1);
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}
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printf("Opening UHD device...\n");
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if (cuhd_open(uhd_args, &uhd)) {
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fprintf(stderr, "Error opening uhd\n");
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exit(-1);
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}
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/* create ifft object */
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if (srslte_ofdm_tx_init(&ifft, SRSLTE_CP_NORM, cell.nof_prb)) {
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fprintf(stderr, "Error creating iFFT object\n");
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exit(-1);
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}
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srslte_ofdm_set_normalize(&ifft, true);
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}
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void base_free() {
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srslte_ofdm_tx_free(&ifft);
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if (sf_buffer) {
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free(sf_buffer);
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}
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if (output_buffer) {
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free(output_buffer);
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}
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cuhd_close(&uhd);
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}
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int main(int argc, char **argv) {
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int sf_idx=0, N_id_2=0;
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cf_t pss_signal[SRSLTE_PSS_LEN];
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float sss_signal0[SRSLTE_SSS_LEN]; // for subframe 0
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float sss_signal5[SRSLTE_SSS_LEN]; // for subframe 5
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int i;
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#ifdef DISABLE_UHD
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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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#endif
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parse_args(argc, argv);
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N_id_2 = cell.id % 3;
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sf_n_re = 2 * SRSLTE_CP_NORM_NSYMB * cell.nof_prb * SRSLTE_NRE;
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sf_n_samples = 2 * SRSLTE_SLOT_LEN(srslte_symbol_sz(cell.nof_prb));
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cell.phich_length = SRSLTE_PHICH_NORM;
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cell.phich_resources = SRSLTE_PHICH_R_1;
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/* this *must* be called after setting slot_len_* */
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base_init();
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/* Generate PSS/SSS signals */
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srslte_pss_generate(pss_signal, N_id_2);
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srslte_sss_generate(sss_signal0, sss_signal5, cell.id);
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printf("Set TX rate: %.2f MHz\n",
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cuhd_set_tx_srate(uhd, srslte_sampling_freq_hz(cell.nof_prb)) / 1000000);
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printf("Set TX gain: %.1f dB\n", cuhd_set_tx_gain(uhd, uhd_gain));
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printf("Set TX freq: %.2f MHz\n",
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cuhd_set_tx_freq(uhd, uhd_freq) / 1000000);
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uint32_t nbits;
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srslte_modem_table_t modulator;
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srslte_modem_table_init(&modulator);
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srslte_modem_table_lte(&modulator, modulation);
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srslte_tcod_t turbocoder;
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srslte_tcod_init(&turbocoder, SRSLTE_TCOD_MAX_LEN_CB);
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srslte_dft_precoding_t dft_precod;
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srslte_dft_precoding_init(&dft_precod, 12);
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nbits = srslte_cbsegm_cbindex(sf_n_samples/8/srslte_mod_bits_x_symbol(modulation)/3 - 12);
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uint32_t ncoded_bits = sf_n_samples/8/srslte_mod_bits_x_symbol(modulation);
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uint8_t *data = malloc(sizeof(uint8_t)*nbits);
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uint8_t *data_enc = malloc(sizeof(uint8_t)*ncoded_bits);
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cf_t *symbols = malloc(sizeof(cf_t)*sf_n_samples);
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bzero(data_enc, sizeof(uint8_t)*ncoded_bits);
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while (1) {
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for (sf_idx = 0; sf_idx < SRSLTE_NSUBFRAMES_X_FRAME; sf_idx++) {
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bzero(sf_buffer, sizeof(cf_t) * sf_n_re);
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#ifdef kk
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if (sf_idx == 0 || sf_idx == 5) {
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srslte_pss_put_slot(pss_signal, sf_buffer, cell.nof_prb, SRSLTE_CP_NORM);
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srslte_sss_put_slot(sf_idx ? sss_signal5 : sss_signal0, sf_buffer, cell.nof_prb,
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SRSLTE_CP_NORM);
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/* Transform to OFDM symbols */
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srslte_ofdm_tx_sf(&ifft, sf_buffer, output_buffer);
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float norm_factor = (float) sqrtf(cell.nof_prb)/15;
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srslte_vec_sc_prod_cfc(output_buffer, uhd_amp*norm_factor, output_buffer, SRSLTE_SF_LEN_PRB(cell.nof_prb));
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} else {
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#endif
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/* Generate random data */
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for (i=0;i<nbits;i++) {
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data[i] = rand()%2;
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}
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srslte_tcod_encode(&turbocoder, data, data_enc, nbits);
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srslte_mod_modulate(&modulator, data_enc, symbols, ncoded_bits);
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srslte_interp_linear_offset_cabs(symbols, output_buffer, 8, sf_n_samples/8, 0, 0);
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// }
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/* send to usrp */
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srslte_vec_sc_prod_cfc(output_buffer, uhd_amp, output_buffer, sf_n_samples);
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cuhd_send(uhd, output_buffer, sf_n_samples, true);
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}
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}
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base_free();
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printf("Done\n");
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exit(0);
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}
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