mirror of https://github.com/PentHertz/srsLTE.git
252 lines
6.4 KiB
C
252 lines
6.4 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 The srsLTE 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 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 PDSCHCFG prhs[1]
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#define TBS prhs[2]
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#define INPUT prhs[3]
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#define NOF_INPUTS 4
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void help()
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{
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mexErrMsgTxt
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("[decoded_ok, llr, rm, bits, symbols] = srslte_pdsch(enbConfig, pdschConfig, trblklen, rxWaveform)\n\n");
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}
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extern int indices[2048];
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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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int i;
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srslte_cell_t cell;
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srslte_pdsch_t pdsch;
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srslte_chest_dl_t chest;
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srslte_ofdm_t fft;
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cf_t *input_fft, *input_signal;
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int nof_re;
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srslte_pdsch_cfg_t cfg;
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srslte_softbuffer_rx_t softbuffer;
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uint32_t rnti32;
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uint32_t cfi;
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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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bzero(&cfg, sizeof(srslte_pdsch_cfg_t));
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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 (mexutils_read_uint32_struct(PDSCHCFG, "RNTI", &rnti32)) {
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mexErrMsgTxt("Field RNTI not found in pdsch config\n");
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return;
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}
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if (mexutils_read_uint32_struct(ENBCFG, "CFI", &cfi)) {
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help();
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return;
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}
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if (mexutils_read_uint32_struct(ENBCFG, "NSubframe", &cfg.sf_idx)) {
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help();
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return;
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}
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if (srslte_pdsch_init(&pdsch, cell)) {
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mexErrMsgTxt("Error initiating PDSCH\n");
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return;
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}
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srslte_pdsch_set_rnti(&pdsch, (uint16_t) (rnti32 & 0xffff));
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if (srslte_softbuffer_rx_init(&softbuffer, cell.nof_prb)) {
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mexErrMsgTxt("Error initiating soft buffer\n");
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return;
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}
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if (srslte_chest_dl_init(&chest, cell)) {
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mexErrMsgTxt("Error initializing equalizer\n");
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return;
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}
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if (srslte_ofdm_rx_init(&fft, cell.cp, cell.nof_prb)) {
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mexErrMsgTxt("Error initializing FFT\n");
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return;
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}
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nof_re = 2 * SRSLTE_CP_NORM_NSYMB * cell.nof_prb * SRSLTE_NRE;
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srslte_ra_dl_grant_t grant;
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grant.mcs.tbs = mxGetScalar(TBS);
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if (grant.mcs.tbs == 0) {
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mexErrMsgTxt("Error trblklen is zero\n");
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return;
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}
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if (srslte_cbsegm(&cfg.cb_segm, grant.mcs.tbs)) {
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mexErrMsgTxt("Error computing CB segmentation\n");
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return;
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}
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if (mexutils_read_uint32_struct(PDSCHCFG, "RV", &cfg.rv)) {
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mexErrMsgTxt("Field RV not found in pdsch config\n");
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return;
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}
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char *mod_str = mexutils_get_char_struct(PDSCHCFG, "Modulation");
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if (!strcmp(mod_str, "QPSK")) {
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grant.mcs.mod = SRSLTE_MOD_QPSK;
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} else if (!strcmp(mod_str, "16QAM")) {
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grant.mcs.mod = SRSLTE_MOD_16QAM;
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} else if (!strcmp(mod_str, "64QAM")) {
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grant.mcs.mod = SRSLTE_MOD_64QAM;
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} else {
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mexErrMsgTxt("Unknown modulation\n");
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return;
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}
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mxFree(mod_str);
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float *prbset;
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mxArray *p;
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p = mxGetField(PDSCHCFG, 0, "PRBSet");
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if (!p) {
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mexErrMsgTxt("Error field PRBSet not found\n");
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return;
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}
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// Only localized PRB supported
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grant.nof_prb = mexutils_read_f(p, &prbset);
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for (i=0;i<cell.nof_prb;i++) {
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grant.prb_idx[0][i] = false;
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for (int j=0;j<grant.nof_prb && !grant.prb_idx[0][i];j++) {
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if ((int) prbset[j] == i) {
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grant.prb_idx[0][i] = true;
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}
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}
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grant.prb_idx[1][i] = grant.prb_idx[0][i];
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}
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free(prbset);
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/* Configure rest of pdsch_cfg parameters */
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grant.Qm = srslte_mod_bits_x_symbol(grant.mcs.mod);
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if (srslte_pdsch_cfg(&cfg, cell, &grant, cfi, cfg.sf_idx, (uint16_t) (rnti32 & 0xffff), cfg.rv)) {
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fprintf(stderr, "Error configuring PDSCH\n");
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exit(-1);
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}
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/** Allocate input buffers */
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if (mexutils_read_cf(INPUT, &input_signal) < 0) {
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mexErrMsgTxt("Error reading input signal\n");
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return;
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}
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input_fft = srslte_vec_malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
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cf_t *ce[SRSLTE_MAX_PORTS];
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for (i=0;i<cell.nof_ports;i++) {
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ce[i] = srslte_vec_malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
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}
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srslte_ofdm_rx_sf(&fft, input_signal, input_fft);
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if (nrhs > NOF_INPUTS) {
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cf_t *cearray = NULL;
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nof_re = mexutils_read_cf(prhs[NOF_INPUTS], &cearray);
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cf_t *cearray_ptr = cearray;
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for (i=0;i<cell.nof_ports;i++) {
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for (int j=0;j<nof_re/cell.nof_ports;j++) {
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ce[i][j] = *cearray;
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cearray++;
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}
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}
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if (cearray_ptr)
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free(cearray_ptr);
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} else {
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srslte_chest_dl_estimate(&chest, input_fft, ce, cfg.sf_idx);
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}
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float noise_power;
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if (nrhs > NOF_INPUTS + 1) {
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noise_power = mxGetScalar(prhs[NOF_INPUTS+1]);
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} else {
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noise_power = srslte_chest_dl_get_noise_estimate(&chest);
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}
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uint8_t *data_bytes = srslte_vec_malloc(sizeof(uint8_t) * grant.mcs.tbs/8);
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if (!data_bytes) {
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return;
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}
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int r = srslte_pdsch_decode(&pdsch, &cfg, &softbuffer, input_fft, ce, noise_power, data_bytes);
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free(data_bytes);
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uint8_t *data = malloc(grant.mcs.tbs);
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srslte_bit_unpack_vector(data_bytes, data, grant.mcs.tbs);
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if (nlhs >= 1) {
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plhs[0] = mxCreateLogicalScalar(r == 0);
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}
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if (nlhs >= 2) {
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mexutils_write_uint8(data, &plhs[1], grant.mcs.tbs, 1);
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}
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if (nlhs >= 3) {
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mexutils_write_cf(pdsch.symbols[0], &plhs[2], cfg.nbits.nof_re, 1);
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}
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if (nlhs >= 4) {
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mexutils_write_cf(pdsch.d, &plhs[3], cfg.nbits.nof_re, 1);
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}
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if (nlhs >= 5) {
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mexutils_write_f(pdsch.e, &plhs[4], cfg.nbits.nof_bits, 1);
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}
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srslte_chest_dl_free(&chest);
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srslte_ofdm_rx_free(&fft);
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srslte_pdsch_free(&pdsch);
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for (i=0;i<cell.nof_ports;i++) {
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free(ce[i]);
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}
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free(data);
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free(input_signal);
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free(input_fft);
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return;
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}
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