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224 lines
6.5 KiB
C
224 lines
6.5 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 UECFG prhs[0]
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#define PUSCHCFG prhs[1]
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#define TRBLKIN prhs[2]
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#define CQI prhs[3]
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#define RI prhs[4]
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#define ACK prhs[5]
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#define NOF_INPUTS 6
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void help()
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{
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mexErrMsgTxt
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("sym=srslte_pusch_encode(ue, chs, trblkin, cqi, ri, ack)\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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if (nrhs != NOF_INPUTS) {
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help();
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return;
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}
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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_t pusch;
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if (srslte_pusch_init(&pusch, cell)) {
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mexErrMsgTxt("Error initiating PUSCH\n");
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return;
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}
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uint32_t rnti32=0;
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if (mexutils_read_uint32_struct(UECFG, "RNTI", &rnti32)) {
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mexErrMsgTxt("Field RNTI not found in pusch config\n");
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return;
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}
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srslte_pusch_set_rnti(&pusch, (uint16_t) (rnti32 & 0xffff));
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uint32_t sf_idx=0;
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if (mexutils_read_uint32_struct(UECFG, "NSubframe", &sf_idx)) {
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mexErrMsgTxt("Field NSubframe not found in UE config\n");
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return;
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}
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srslte_ra_mcs_t mcs;
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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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mcs.mod = SRSLTE_MOD_QPSK;
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} else if (!strcmp(mod_str, "16QAM")) {
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mcs.mod = SRSLTE_MOD_16QAM;
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} else if (!strcmp(mod_str, "64QAM")) {
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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 = 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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srslte_ra_ul_alloc_t prb_alloc;
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bzero(&prb_alloc, sizeof(srslte_ra_ul_alloc_t));
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prb_alloc.L_prb = mexutils_read_f(p, &prbset);
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prb_alloc.n_prb[0] = prbset[0];
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prb_alloc.n_prb[1] = prbset[0];
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free(prbset);
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mexPrintf("L_prb: %d, n_prb: %d\n", prb_alloc.L_prb, prb_alloc.n_prb[2*sf_idx]);
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uint8_t *trblkin = NULL;
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mcs.tbs = mexutils_read_uint8(TRBLKIN, &trblkin);
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srslte_harq_t harq_process;
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if (srslte_harq_init(&harq_process, cell)) {
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mexErrMsgTxt("Error initiating HARQ process\n");
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return;
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}
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if (srslte_harq_setup_ul(&harq_process, mcs, 0, sf_idx, &prb_alloc)) {
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mexErrMsgTxt("Error configuring HARQ process\n");
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return;
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}
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uint32_t nof_re = SRSLTE_NRE*cell.nof_prb*2*SRSLTE_CP_NSYMB(cell.cp);
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cf_t *sf_symbols = srslte_vec_malloc(sizeof(cf_t) * nof_re);
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if (!sf_symbols) {
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mexErrMsgTxt("malloc");
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return;
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}
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bzero(sf_symbols, sizeof(cf_t) * nof_re);
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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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uci_data.uci_cqi_len = mexutils_read_uint8(CQI, &uci_data.uci_cqi);
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uint8_t *tmp;
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uci_data.uci_ri_len = mexutils_read_uint8(RI, &tmp);
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if (uci_data.uci_ri_len > 0) {
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uci_data.uci_ri = *tmp;
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}
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free(tmp);
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uci_data.uci_ack_len = mexutils_read_uint8(ACK, &tmp);
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if (uci_data.uci_ack_len > 0) {
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uci_data.uci_ack = *tmp;
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}
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free(tmp);
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if (mexutils_read_uint32_struct(PUSCHCFG, "OffsetCQI", &uci_data.I_offset_cqi)) {
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uci_data.I_offset_cqi = 7;
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}
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if (mexutils_read_uint32_struct(PUSCHCFG, "OffsetRI", &uci_data.I_offset_ri)) {
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uci_data.I_offset_ri = 2;
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}
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if (mexutils_read_uint32_struct(PUSCHCFG, "OffsetACK", &uci_data.I_offset_ack)) {
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uci_data.I_offset_ack = 0;
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}
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mexPrintf("TRBL_len: %d, CQI_len: %d, ACK_len: %d (%d), RI_len: %d (%d)\n", 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("NofRE: %d, NofBits: %d, TBS: %d\n", harq_process.nof_re, harq_process.nof_bits, harq_process.mcs.tbs);
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int r = srslte_pusch_uci_encode(&pusch, &harq_process, trblkin, uci_data, sf_symbols);
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if (r < 0) {
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mexErrMsgTxt("Error encoding PUSCH\n");
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return;
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}
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uint32_t rv=0;
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if (mexutils_read_uint32_struct(PUSCHCFG, "RV", &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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if (rv > 0) {
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if (srslte_harq_setup_ul(&harq_process, mcs, rv, sf_idx, &prb_alloc)) {
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mexErrMsgTxt("Error configuring HARQ process\n");
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return;
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}
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r = srslte_pusch_uci_encode(&pusch, &harq_process, trblkin, uci_data, sf_symbols);
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if (r < 0) {
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mexErrMsgTxt("Error encoding PUSCH\n");
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return;
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}
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}
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cf_t *scfdma = srslte_vec_malloc(sizeof(cf_t) * SRSLTE_SF_LEN_PRB(cell.nof_prb));
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bzero(scfdma, sizeof(cf_t) * SRSLTE_SF_LEN_PRB(cell.nof_prb));
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srslte_ofdm_t fft;
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srslte_ofdm_tx_init(&fft, SRSLTE_CP_NORM, cell.nof_prb);
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srslte_ofdm_set_normalize(&fft, true);
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srslte_ofdm_set_freq_shift(&fft, 0.5);
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srslte_ofdm_tx_sf(&fft, sf_symbols, scfdma);
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// Matlab toolbox expects further normalization
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srslte_vec_sc_prod_cfc(scfdma, 1.0/sqrtf(srslte_symbol_sz(cell.nof_prb)), scfdma, SRSLTE_SF_LEN_PRB(cell.nof_prb));
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if (nlhs >= 1) {
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mexutils_write_cf(scfdma, &plhs[0], SRSLTE_SF_LEN_PRB(cell.nof_prb), 1);
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}
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if (nlhs >= 2) {
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mexutils_write_cf(sf_symbols, &plhs[1], nof_re, 1);
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}
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if (nlhs >= 3) {
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mexutils_write_cf(pusch.z, &plhs[2], harq_process.nof_re, 1);
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}
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srslte_pusch_free(&pusch);
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free(trblkin);
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free(uci_data.uci_cqi);
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free(sf_symbols);
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free(scfdma);
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return;
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}
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