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128 lines
3.6 KiB
C
128 lines
3.6 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 <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 ENBCFG prhs[0]
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#define INPUT prhs[1]
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#define ALGO prhs[2]
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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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("[N_id_1,sf_idx,corr_output_m0,corr_output_m1] = srslte_sss(enbConfig, inputSignal, [Algorithm])\n"
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"\tinputSignal must be aligned to the subframe. CP length is assumed Normal.\n"
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"\tAlgorithm is an optional parameter: Can be 'partial','diff','full'\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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srslte_cell_t cell;
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srslte_sss_synch_t sss;
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cf_t *input_symbols;
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int frame_len;
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uint32_t m0, m1;
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float m0_value, m1_value;
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char alg[64];
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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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if (mexutils_read_cell(ENBCFG, &cell)) {
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help();
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return;
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}
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if (nrhs > NOF_INPUTS) {
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mxGetString(ALGO, alg, (mwSize)sizeof(alg));
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} else {
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strcpy(alg, "full");
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}
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/** Allocate input buffers */
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frame_len = mexutils_read_cf(INPUT, &input_symbols);
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if (frame_len < 0) {
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mexErrMsgTxt("Error reading input symbols\n");
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return;
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}
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if (srslte_sss_synch_init(&sss, srslte_symbol_sz(cell.nof_prb))) {
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mexErrMsgTxt("Error initializing SSS object\n");
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return;
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}
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srslte_sss_synch_set_N_id_2(&sss, cell.id%3);
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// Find SSS
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uint32_t sss_idx = SRSLTE_SLOT_IDX_CPNORM(5,srslte_symbol_sz(cell.nof_prb));
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if (sss_idx > frame_len) {
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mexErrMsgTxt("Error too few samples provided.\n");
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return;
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}
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//mexPrintf("SSS begins at %d/%d. Running algorithm %s\n", sss_idx, frame_len, alg);
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if (!strcmp(alg, "partial")) {
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srslte_sss_synch_m0m1_partial(&sss, &input_symbols[sss_idx], 3, NULL, &m0, &m0_value, &m1, &m1_value);
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} else if (!strcmp(alg, "diff")) {
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srslte_sss_synch_m0m1_diff(&sss, &input_symbols[sss_idx], &m0, &m0_value, &m1, &m1_value);
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} else if (!strcmp(alg, "full")) {
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srslte_sss_synch_m0m1_partial(&sss, &input_symbols[sss_idx], 1, NULL, &m0, &m0_value, &m1, &m1_value);
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} else {
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mexErrMsgTxt("Unsupported algorithm type\n");
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return;
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}
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//mexPrintf("m0: %d, m1: %d, N_id_1: %d\n", m0, m1, srslte_sss_synch_N_id_1(&sss, m0, m1));
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if (nlhs >= 1) {
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plhs[0] = mxCreateDoubleScalar(srslte_sss_synch_N_id_1(&sss, m0, m1));
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}
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if (nlhs >= 2) {
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plhs[1] = mxCreateDoubleScalar(srslte_sss_synch_subframe(m0, m1));
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}
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if (nlhs >= 3) {
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mexutils_write_f(sss.corr_output_m0, &plhs[2], SRSLTE_SSS_N, 1);
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}
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if (nlhs >= 4) {
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mexutils_write_f(sss.corr_output_m1, &plhs[3], SRSLTE_SSS_N, 1);
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}
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srslte_sss_synch_free(&sss);
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free(input_symbols);
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return;
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}
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