mirror of https://github.com/PentHertz/srsLTE.git
94 lines
2.3 KiB
C
94 lines
2.3 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 NOF_INPUTS 2
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void help()
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{
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mexErrMsgTxt
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("[offset,corr] = srslte_cp_synch(enbConfig, inputSignal)\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_cp_synch_t cp_synch;
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cf_t *input_symbols;
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int frame_len;
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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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/** 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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uint32_t symbol_sz = srslte_symbol_sz(cell.nof_prb);
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if (srslte_cp_synch_init(&cp_synch, symbol_sz)) {
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fprintf(stderr, "Error initiating CP\n");
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return;
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}
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uint32_t cp_len = SRSLTE_CP_LEN_NORM(1, symbol_sz);
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uint32_t nsymbols = frame_len/(symbol_sz+cp_len)-1;
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uint32_t peak_idx = srslte_cp_synch(&cp_synch, input_symbols, symbol_sz, nsymbols, cp_len);
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if (nlhs >= 1) {
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plhs[0] = mxCreateDoubleScalar(peak_idx);
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}
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if (nlhs >= 2) {
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mexutils_write_cf(cp_synch.corr, &plhs[1], symbol_sz, 1);
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}
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srslte_cp_synch_free(&cp_synch);
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free(input_symbols);
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return;
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}
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