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82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
10 years ago
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/*
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* Copyright (c) 2012, Ismael Gomez-Miguelez <ismael.gomez@tsc.upc.edu>.
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* This file is part of ALOE++ (http://flexnets.upc.edu/)
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*
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* ALOE++ 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 published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* ALOE++ 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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* You should have received a copy of the GNU Lesser General Public License
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* along with ALOE++. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include "liblte/phy/phy.h"
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#include "liblte/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 NOF_INPUTS 1
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void help()
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{
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mexErrMsgTxt
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("[decoded_bits] = liblte_viterbi(input_llr, type)\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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viterbi_t viterbi;
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float *input_llr;
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uint8_t *output_data;
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int nof_bits;
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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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nof_bits = mexutils_read_f(INPUT, &input_llr);
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output_data = vec_malloc(nof_bits * sizeof(uint8_t));
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uint32_t poly[3] = { 0x6D, 0x4F, 0x57 };
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if (viterbi_init(&viterbi, viterbi_37, poly, nof_bits/3, true)) {
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return;
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}
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if (nrhs >= 2) {
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float gain_quant = mxGetScalar(prhs[1]);
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viterbi_set_gain_quant(&viterbi, gain_quant);
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}
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viterbi_decode_f(&viterbi, input_llr, output_data, nof_bits/3);
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if (nlhs >= 1) {
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mexutils_write_uint8(output_data, &plhs[0], nof_bits/3, 1);
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}
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if (nlhs >= 2) {
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mexutils_write_uint8(viterbi.symbols_uc, &plhs[1], nof_bits/3, 1);
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}
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viterbi_free(&viterbi);
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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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