mirror of https://github.com/PentHertz/srsLTE.git
117 lines
3.2 KiB
C
117 lines
3.2 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 <string.h>
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#include "srslte/srslte.h"
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#include "srslte/mex/mexutils.h"
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/** MEX function to be called from MATLAB to test the channel estimator
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*/
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#define UECFG prhs[0]
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#define PRACHCFG prhs[1]
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#define NOF_INPUTS 2
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void help()
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{
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mexErrMsgTxt
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("waveform = srslte_prach(ueConfig, prachConfig)\n\n");
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}
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/* the gateway function */
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void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
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{
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if (nrhs != NOF_INPUTS) {
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help();
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return;
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}
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uint32_t n_ul_rb = 0;
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if (mexutils_read_uint32_struct(UECFG, "NULRB", &n_ul_rb)) {
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mexErrMsgTxt("Field NULRB not found in UE config\n");
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return;
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}
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int r = srslte_symbol_sz(n_ul_rb);
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if (r < 0) {
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mexErrMsgTxt("Invalid NULRB\n");
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return;
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}
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uint32_t N_ifft_ul = (uint32_t) r;
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uint32_t sf_idx = 0;
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mexutils_read_uint32_struct(UECFG, "NSubframe", &sf_idx);
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uint32_t nframe = 0;
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mexutils_read_uint32_struct(UECFG, "NFrame", &nframe);
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uint32_t preamble_format = 0;
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mexutils_read_uint32_struct(PRACHCFG, "Format", &preamble_format);
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uint32_t root_seq_idx = 0;
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mexutils_read_uint32_struct(PRACHCFG, "SeqIdx", &root_seq_idx);
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uint32_t seq_idx = 0;
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mexutils_read_uint32_struct(PRACHCFG, "PreambleIdx", &seq_idx);
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uint32_t zero_corr_zone = 0;
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mexutils_read_uint32_struct(PRACHCFG, "CyclicShiftIdx", &zero_corr_zone);
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uint32_t high_speed_flag = 0;
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mexutils_read_uint32_struct(PRACHCFG, "HighSpeed", &high_speed_flag);
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uint32_t timing_offset = 0;
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mexutils_read_uint32_struct(PRACHCFG, "TimingOffset", &timing_offset);
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uint32_t frequency_offset = 0;
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mexutils_read_uint32_struct(PRACHCFG, "FreqOffset", &frequency_offset);
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srslte_prach_t prach;
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if (srslte_prach_init(&prach, N_ifft_ul, preamble_format, root_seq_idx, high_speed_flag, zero_corr_zone)) {
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mexErrMsgTxt("Error initiating PRACH\n");
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return;
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}
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uint32_t nof_samples = srslte_sampling_freq_hz(n_ul_rb) * 0.003;
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cf_t *signal = srslte_vec_malloc(sizeof(cf_t) * nof_samples);
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if (!signal) {
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mexErrMsgTxt("malloc");
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return;
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}
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bzero(signal, sizeof(cf_t) * nof_samples);
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if (srslte_prach_gen(&prach, seq_idx, frequency_offset, 0.2, signal)) {
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mexErrMsgTxt("Error generating PRACH\n");
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return;
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}
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if (nlhs >= 0) {
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mexutils_write_cf(signal, &plhs[0], nof_samples, 1);
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}
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free(signal);
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srslte_prach_free(&prach);
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return;
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}
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