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108 lines
2.6 KiB
C
108 lines
2.6 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 INPUT prhs[0]
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#define NITERS prhs[1]
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#define NOF_INPUTS 1
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void help()
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{
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mexErrMsgTxt
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("[decoded_bits] = srslte_turbodecoder(input_llr, nof_iterations)\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_tdec_t tdec;
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float *input_llr;
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uint8_t *output_data;
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uint32_t nof_bits;
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uint32_t nof_iterations;
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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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// Read input symbols
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uint32_t nof_symbols = mexutils_read_f(INPUT, &input_llr);
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if (nof_symbols < 40) {
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mexErrMsgTxt("Minimum block size is 40\n");
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return;
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}
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nof_bits = (nof_symbols-12)/3;
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if (!srslte_cbsegm_cbsize_isvalid(nof_bits)) {
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mexErrMsgTxt("Invalid codeblock size\n");
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return;
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}
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// read number of iterations
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if (nrhs > NOF_INPUTS) {
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nof_iterations = (uint32_t) mxGetScalar(prhs[1]);
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if (nof_iterations > 50) {
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mexErrMsgTxt("Maximum number of iterations is 50\n");
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return;
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}
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} else {
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nof_iterations = 5; // set the default nof iterations to 5 as in matlab
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}
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// allocate memory for output bits
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output_data = srslte_vec_malloc(nof_bits * sizeof(uint8_t));
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if (srslte_tdec_init(&tdec, nof_bits)) {
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mexErrMsgTxt("Error initiating Turbo decoder\n");
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return;
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}
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srslte_tdec_run_all(&tdec, input_llr, output_data, nof_iterations, nof_bits);
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if (nlhs >= 1) {
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mexutils_write_uint8(output_data, &plhs[0], nof_bits, 1);
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}
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srslte_tdec_free(&tdec);
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free(input_llr);
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free(output_data);
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return;
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}
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