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250 lines
7.3 KiB
C
250 lines
7.3 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 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_verbose = SRSLTE_VERBOSE_NONE;
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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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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, "NSubframe", &cfg.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_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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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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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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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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uint8_t *trblkin_bits = NULL;
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grant.mcs.tbs = mexutils_read_uint8(TRBLKIN, &trblkin_bits);
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uint8_t *trblkin = srslte_vec_malloc(grant.mcs.tbs/8);
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srslte_bit_pack_vector(trblkin_bits, trblkin, grant.mcs.tbs);
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free(trblkin_bits);
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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_pusch_cfg(&pusch, &cfg, &grant, NULL, NULL, NULL, cfg.sf_idx, cfg.rv, 0)) {
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fprintf(stderr, "Error configuring PUSCH\n");
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exit(-1);
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}
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mexPrintf("L_prb: %d, n_prb: %d\n", grant.L_prb, grant.n_prb[0]);
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srslte_softbuffer_tx_t softbuffer;
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if (srslte_softbuffer_tx_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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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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uint8_t *tmp;
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uci_data.uci_cqi_len = mexutils_read_uint8(CQI, &tmp);
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memcpy(&uci_data.uci_cqi, tmp, uci_data.uci_cqi_len);
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free(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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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("NofRE: %3d, NofBits: %3d, TBS: %3d, N_srs=%d\n", cfg.nbits.nof_re, cfg.nbits.nof_bits, grant.mcs.tbs, N_srs);
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int r = srslte_pusch_uci_encode(&pusch, &cfg, &softbuffer, 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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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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if (cfg.rv > 0) {
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r = srslte_pusch_uci_encode(&pusch, &cfg, &softbuffer, 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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if (nlhs >= 1) {
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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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mexutils_write_cf(scfdma, &plhs[0], SRSLTE_SF_LEN_PRB(cell.nof_prb), 1);
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free(scfdma);
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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], cfg.nbits.nof_re, 1);
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}
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if (nlhs >= 4) {
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mexutils_write_uint8(pusch.q, &plhs[3], cfg.nbits.nof_bits, 1);
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}
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srslte_pusch_free(&pusch);
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srslte_softbuffer_tx_free(&softbuffer);
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free(trblkin);
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free(sf_symbols);
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return;
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}
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