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310 lines
8.8 KiB
C
310 lines
8.8 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 UECFG prhs[0]
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#define PUSCHCFG 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, cqi_data, ri_data, ack_data] = srslte_pusch(ueConfig, puschConfig, trblklen, rxWaveform)\n\n");
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}
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extern int indices[2048];
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int rv_seq[4] = {0, 2, 3, 1};
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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_ofdm_t ofdm_rx;
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srslte_pusch_t pusch;
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srslte_chest_ul_t chest;
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cf_t *input_fft;
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srslte_softbuffer_rx_t softbuffer;
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uint32_t rnti32;
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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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srslte_verbose = SRSLTE_VERBOSE_INFO;
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srslte_cell_t cell;
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bzero(&cell, sizeof(srslte_cell_t));
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cell.nof_ports = 1;
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if (mexutils_read_uint32_struct(UECFG, "NCellID", &cell.id)) {
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mexErrMsgTxt("Field NCellID not found in UE config\n");
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return;
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}
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if (mexutils_read_uint32_struct(UECFG, "NULRB", &cell.nof_prb)) {
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mexErrMsgTxt("Field NULRB not found in UE config\n");
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return;
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}
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srslte_pusch_cfg_t cfg;
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bzero(&cfg, sizeof(srslte_pusch_cfg_t));
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if (mexutils_read_uint32_struct(UECFG, "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(UECFG, "NSubframe", &cfg.sf_idx)) {
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help();
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return;
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}
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if (srslte_ofdm_rx_init(&ofdm_rx, cell.cp, cell.nof_prb)) {
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fprintf(stderr, "Error initializing FFT\n");
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return;
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}
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srslte_ofdm_set_normalize(&ofdm_rx, true);
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srslte_ofdm_set_freq_shift(&ofdm_rx, 0.5);
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if (srslte_pusch_init(&pusch, cell)) {
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mexErrMsgTxt("Error initiating PDSCH\n");
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return;
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}
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uint16_t rnti = (uint16_t) (rnti32 & 0xffff);
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srslte_pusch_set_rnti(&pusch, rnti);
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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_ul_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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srslte_ra_ul_grant_t grant;
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bzero(&grant, sizeof(srslte_ra_ul_grant_t));
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char *mod_str = mexutils_get_char_struct(PUSCHCFG, "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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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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uint32_t N_srs = 0;
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mexutils_read_uint32_struct(PUSCHCFG, "Shortened", &N_srs);
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if (N_srs == 1) {
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pusch.shortened = true;
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}
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float *prbset = NULL;
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mxArray *p;
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p = mxGetField(PUSCHCFG, 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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grant.L_prb = mexutils_read_f(p, &prbset);
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grant.n_prb[0] = prbset[0];
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grant.n_prb[1] = prbset[0];
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free(prbset);
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grant.M_sc = grant.L_prb*SRSLTE_NRE;
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grant.M_sc_init = grant.M_sc; // FIXME: What should M_sc_init be?
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grant.Qm = srslte_mod_bits_x_symbol(grant.mcs.mod);
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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(PUSCHCFG, "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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uint32_t max_iterations = 5;
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mexutils_read_uint32_struct(PUSCHCFG, "NTurboDecIts", &max_iterations);
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/* Configure rest of pdsch_cfg parameters */
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if (srslte_pusch_cfg(&pusch, &cfg, &grant, NULL, NULL, NULL, cfg.sf_idx, cfg.rv, 0)) {
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fprintf(stderr, "Error configuring PDSCH\n");
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exit(-1);
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}
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srslte_uci_data_t uci_data;
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bzero(&uci_data, sizeof(srslte_uci_data_t));
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mexutils_read_uint32_struct(PUSCHCFG, "OCQI", &uci_data.uci_cqi_len);
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mexutils_read_uint32_struct(PUSCHCFG, "ORI", &uci_data.uci_ri_len);
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mexutils_read_uint32_struct(PUSCHCFG, "OACK", &uci_data.uci_ack_len);
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float beta;
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if (mexutils_read_float_struct(PUSCHCFG, "BetaCQI", &beta)) {
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cfg.uci_cfg.I_offset_cqi = 7;
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} else {
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cfg.uci_cfg.I_offset_cqi = srslte_sch_find_Ioffset_cqi(beta);
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}
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if (mexutils_read_float_struct(PUSCHCFG, "BetaRI", &beta)) {
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cfg.uci_cfg.I_offset_ri = 2;
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} else {
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cfg.uci_cfg.I_offset_ri = srslte_sch_find_Ioffset_ri(beta);
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}
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if (mexutils_read_float_struct(PUSCHCFG, "BetaACK", &beta)) {
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cfg.uci_cfg.I_offset_ack = 0;
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} else {
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cfg.uci_cfg.I_offset_ack = srslte_sch_find_Ioffset_ack(beta);
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}
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mexPrintf("TRBL_len: %d, CQI_len: %2d, ACK_len: %d (%d), RI_len: %d (%d)\n", grant.mcs.tbs,
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uci_data.uci_cqi_len, uci_data.uci_ack_len, uci_data.uci_ack, uci_data.uci_ri_len, uci_data.uci_ri);
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mexPrintf("I_cqi: %2d, I_ri: %2d, I_ack=%2d\n", cfg.uci_cfg.I_offset_cqi, cfg.uci_cfg.I_offset_ri, cfg.uci_cfg.I_offset_ack);
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mexPrintf("L_prb: %d, n_prb: %d/%d, TBS=%d\n", grant.L_prb, grant.n_prb[0], grant.n_prb[1], grant.mcs.tbs);
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/** Allocate input buffers */
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int nof_retx=1;
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if (mexutils_isCell(INPUT)) {
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nof_retx = mexutils_getLength(INPUT);
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}
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cf_t *ce = srslte_vec_malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));;
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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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srslte_sch_set_max_noi(&pusch.ul_sch, max_iterations);
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input_fft = NULL;
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int r=-1;
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for (int rvIdx=0;rvIdx<nof_retx && r != 0;rvIdx++) {
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mxArray *tmp = (mxArray*) INPUT;
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if (mexutils_isCell(INPUT)) {
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tmp = mexutils_getCellArray(INPUT, rvIdx);
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if (nof_retx > 1) {
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cfg.rv = rv_seq[rvIdx%4];
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}
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}
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// Read input signal
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cf_t *input_signal = NULL;
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int insignal_len = mexutils_read_cf(tmp, &input_signal);
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if (insignal_len < 0) {
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mexErrMsgTxt("Error reading input signal\n");
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return;
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}
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if (insignal_len == SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp)) {
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input_fft = input_signal;
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mexPrintf("Input is after fft\n");
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} else {
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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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srslte_ofdm_rx_sf(&ofdm_rx, input_signal, input_fft);
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mexPrintf("Input is before fft\n");
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free(input_signal);
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}
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if (nrhs > NOF_INPUTS) {
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cf_t *cearray = NULL;
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mexutils_read_cf(prhs[NOF_INPUTS], &cearray);
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cf_t *cearray_ptr = cearray;
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for (int j=0;j<SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp);j++) {
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ce[j] = *cearray_ptr;
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cearray_ptr++;
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}
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if (cearray)
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free(cearray);
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} else {
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srslte_chest_ul_estimate(&chest, input_fft, ce, grant.L_prb, cfg.sf_idx, 0, grant.n_prb);
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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 if (nrhs > NOF_INPUTS) {
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noise_power = 0;
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} else {
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noise_power = srslte_chest_ul_get_noise_estimate(&chest);
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}
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r = srslte_pusch_decode(&pusch, &cfg, &softbuffer, input_fft, ce, noise_power, rnti, data_bytes, &uci_data);
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}
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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(uci_data.uci_cqi, &plhs[1], uci_data.uci_cqi_len, 1);
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}
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if (nlhs >= 3 && uci_data.uci_ri_len <= 1) {
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mexutils_write_uint8(&uci_data.uci_ri, &plhs[2], uci_data.uci_ri_len, 1);
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}
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if (nlhs >= 4 && uci_data.uci_ack_len <= 1) {
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mexutils_write_uint8(&uci_data.uci_ack, &plhs[3], uci_data.uci_ack_len, 1);
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}
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srslte_softbuffer_rx_free(&softbuffer);
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srslte_chest_ul_free(&chest);
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srslte_pusch_free(&pusch);
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srslte_ofdm_rx_free(&ofdm_rx);
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free(ce);
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free(data_bytes);
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free(data);
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if (input_fft) {
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free(input_fft);
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}
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return;
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}
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