/* Precalculate the PDSCH scramble sequences for a given RNTI. This function takes a while
* to execute, so shall be called once the final C-RNTI has been allocated for the session.
* For the connection procedure, use srslte_pusch_encode_rnti() or srslte_pusch_decode_rnti() functions
*/
void srslte_ue_dl_set_rnti(srslte_ue_dl_t *q, uint16_t rnti) {
srslte_pdsch_set_rnti(&q->pdsch, rnti);
// Compute UE-specific and Common search space for this RNTI
for (int cfi=0;cfi<3;cfi++) {
for (int sf_idx=0;sf_idx<10;sf_idx++) {
q->current_ss_ue[cfi][sf_idx].nof_locations = srslte_pdcch_ue_locations(&q->pdcch, q->current_ss_ue[cfi][sf_idx].loc, MAX_CANDIDATES_UE, sf_idx, cfi+1, rnti);
}
q->current_ss_common[cfi].nof_locations = srslte_pdcch_common_locations(&q->pdcch, q->current_ss_common[cfi].loc, MAX_CANDIDATES_COM, cfi+1);
}
q->current_rnti = rnti;
}
/* Precalculate the PDSCH scramble sequences for a given RNTI. This function takes a while
* to execute, so shall be called once the final C-RNTI has been allocated for the session.
* For the connection procedure, use srslte_pusch_encode_rnti() or srslte_pusch_decode_rnti() functions
*/
void srslte_ue_dl_set_rnti(srslte_ue_dl_t* q, uint16_t rnti)
{
srslte_pdsch_set_rnti(&q->pdsch, rnti);
srslte_dl_sf_cfg_t sf_cfg;
ZERO_OBJECT(sf_cfg);
// Compute UE-specific and Common search space for this RNTI
for (int i = 0; i < MI_NOF_REGS; i++) {
srslte_pdcch_set_regs(&q->pdcch, &q->regs[i]);
for (int cfi = 0; cfi < 3; cfi++) {
sf_cfg.cfi = cfi + 1;
for (int sf_idx = 0; sf_idx < 10; sf_idx++) {
sf_cfg.tti = sf_idx;
q->current_ss_ue[i][cfi][sf_idx].nof_locations = srslte_pdcch_ue_locations(
&q->pdcch, &sf_cfg, q->current_ss_ue[i][cfi][sf_idx].loc, MAX_CANDIDATES_UE, rnti);
}
q->current_ss_common[i][cfi].nof_locations =
srslte_pdcch_common_locations(&q->pdcch, q->current_ss_common[i][cfi].loc, MAX_CANDIDATES_COM, cfi + 1);
}
}
q->pregen_rnti = rnti;
}
int srslte_enb_dl_add_rnti(srslte_enb_dl_t* q, uint16_t rnti)
{
return srslte_pdsch_set_rnti(&q->pdsch, rnti);
}
int main(int argc, char **argv) {
srslte_pdsch_t pdsch;
uint32_t i, j;
uint8_t *data = NULL;
cf_t *ce[SRSLTE_MAX_PORTS];
cf_t *slot_symbols[SRSLTE_MAX_PORTS];
int ret = -1;
struct timeval t[3];
srslte_pdsch_cfg_t pdsch_cfg;
srslte_softbuffer_tx_t softbuffer_tx;
srslte_softbuffer_rx_t softbuffer_rx;
uint32_t rv;
parse_args(argc,argv);
bzero(&pdsch, sizeof(srslte_pdsch_t));
bzero(&pdsch_cfg, sizeof(srslte_pdsch_cfg_t));
bzero(ce, sizeof(cf_t*)*SRSLTE_MAX_PORTS);
bzero(slot_symbols, sizeof(cf_t*)*SRSLTE_MAX_PORTS);
bzero(&softbuffer_rx, sizeof(srslte_softbuffer_rx_t));
bzero(&softbuffer_tx, sizeof(srslte_softbuffer_tx_t));
srslte_ra_dl_grant_t grant;
grant.mcs.tbs = tbs;
grant.mcs.mod = modulation;
grant.Qm = srslte_mod_bits_x_symbol(grant.mcs.mod);
grant.nof_prb = cell.nof_prb; // Allocate all PRB
for (i=0;i<grant.nof_prb;i++) {
grant.prb_idx[0][i] = true;
}
memcpy(&grant.prb_idx[1], &grant.prb_idx[0], SRSLTE_MAX_PRB * sizeof(bool));
/* Configure PDSCH */
if (srslte_pdsch_cfg(&pdsch_cfg, cell, &grant, cfi, subframe, 1234, 0)) {
fprintf(stderr, "Error configuring PDSCH\n");
exit(-1);
}
/* init memory */
for (i=0;i<cell.nof_ports;i++) {
ce[i] = malloc(sizeof(cf_t) * SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp));
if (!ce[i]) {
perror("malloc");
goto quit;
}
for (j=0;j<SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp);j++) {
ce[i][j] = 1;
}
slot_symbols[i] = calloc(sizeof(cf_t) , SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp));
if (!slot_symbols[i]) {
perror("malloc");
goto quit;
}
}
data = malloc(sizeof(uint8_t) * tbs/8);
if (!data) {
perror("malloc");
goto quit;
}
if (srslte_pdsch_init(&pdsch, cell)) {
fprintf(stderr, "Error creating PDSCH object\n");
goto quit;
}
srslte_pdsch_set_rnti(&pdsch, 1234);
if (srslte_softbuffer_tx_init(&softbuffer_tx, cell.nof_prb)) {
fprintf(stderr, "Error initiating TX soft buffer\n");
goto quit;
}
if (srslte_softbuffer_rx_init(&softbuffer_rx, cell.nof_prb)) {
fprintf(stderr, "Error initiating RX soft buffer\n");
goto quit;
}
if (SRSLTE_VERBOSE_ISNONE()) {
printf("Decoding TBS: %d\r",grant.mcs.tbs);
}
for (i=0;i<grant.mcs.tbs/8;i++) {
data[i] = rand()%256;
}
for (rv=0;rv<=rv_idx;rv++) {
pdsch_cfg.rv = rv;
if (srslte_pdsch_encode(&pdsch, &pdsch_cfg, &softbuffer_tx, data, slot_symbols)) {
fprintf(stderr, "Error encoding PDSCH\n");
goto quit;
}
/* combine outputs */
for (i=0;i<cell.nof_ports;i++) {
for (j=0;j<SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp);j++) {
if (i > 0) {
slot_symbols[0][j] += slot_symbols[i][j];
}
ce[i][j] = 1;
}
}
gettimeofday(&t[1], NULL);
int r = srslte_pdsch_decode(&pdsch, &pdsch_cfg, &softbuffer_rx, slot_symbols[0], ce, 0, data);
gettimeofday(&t[2], NULL);
get_time_interval(t);
if (r) {
printf("Error decoding TBS: %d\n", grant.mcs.tbs);
ret = -1;
goto quit;
} else {
printf("DECODED OK in %d:%d (%.2f Mbps)\n",
(int) t[0].tv_sec, (int) t[0].tv_usec, (float) grant.mcs.tbs/t[0].tv_usec);
}
}
ret = 0;
quit:
srslte_pdsch_free(&pdsch);
srslte_softbuffer_tx_free(&softbuffer_tx);
srslte_softbuffer_rx_free(&softbuffer_rx);
for (i=0;i<cell.nof_ports;i++) {
if (ce[i]) {
free(ce[i]);
}
if (slot_symbols[i]) {
free(slot_symbols[i]);
}
}
if (data) {
free(data);
}
if (ret) {
printf("Error\n");
} else {
printf("Ok\n");
}
exit(ret);
}
void base_init() {
int i;
/* Select transmission mode */
if (srslte_str2mimotype(mimo_type_str, &pdsch_cfg.mimo_type)) {
ERROR("Wrong transmission mode! Allowed modes: single, diversity, cdd and multiplex");
exit(-1);
}
/* Configure cell and PDSCH in function of the transmission mode */
switch(pdsch_cfg.mimo_type) {
case SRSLTE_MIMO_TYPE_SINGLE_ANTENNA:
cell.nof_ports = 1;
break;
case SRSLTE_MIMO_TYPE_TX_DIVERSITY:
cell.nof_ports = 2;
break;
case SRSLTE_MIMO_TYPE_CDD:
cell.nof_ports = 2;
break;
case SRSLTE_MIMO_TYPE_SPATIAL_MULTIPLEX:
cell.nof_ports = 2;
break;
default:
ERROR("Transmission mode not implemented.");
exit(-1);
}
/* Allocate memory */
for(i = 0; i < SRSLTE_MAX_CODEWORDS; i++) {
data[i] = srslte_vec_malloc(sizeof(uint8_t) * SOFTBUFFER_SIZE);
if (!data[i]) {
perror("malloc");
exit(-1);
}
bzero(data[i], sizeof(uint8_t) * SOFTBUFFER_SIZE);
}
data_mbms = srslte_vec_malloc(sizeof(uint8_t) * SOFTBUFFER_SIZE);
/* init memory */
for (i = 0; i < SRSLTE_MAX_PORTS; i++) {
sf_buffer[i] = srslte_vec_malloc(sizeof(cf_t) * sf_n_re);
if (!sf_buffer[i]) {
perror("malloc");
exit(-1);
}
}
for (i = 0; i < SRSLTE_MAX_PORTS; i++) {
output_buffer[i] = srslte_vec_malloc(sizeof(cf_t) * sf_n_samples);
if (!output_buffer[i]) {
perror("malloc");
exit(-1);
}
bzero(output_buffer[i], sizeof(cf_t) * sf_n_samples);
}
/* open file or USRP */
if (output_file_name) {
if (strcmp(output_file_name, "NULL")) {
if (srslte_filesink_init(&fsink, output_file_name, SRSLTE_COMPLEX_FLOAT_BIN)) {
fprintf(stderr, "Error opening file %s\n", output_file_name);
exit(-1);
}
null_file_sink = false;
} else {
null_file_sink = true;
}
} else {
#ifndef DISABLE_RF
printf("Opening RF device...\n");
if (srslte_rf_open_multi(&rf, rf_args, cell.nof_ports)) {
fprintf(stderr, "Error opening rf\n");
exit(-1);
}
#else
printf("Error RF not available. Select an output file\n");
exit(-1);
#endif
}
if (net_port > 0) {
if (srslte_netsource_init(&net_source, "127.0.0.1", net_port, SRSLTE_NETSOURCE_UDP)) {
fprintf(stderr, "Error creating input UDP socket at port %d\n", net_port);
exit(-1);
}
if (null_file_sink) {
if (srslte_netsink_init(&net_sink, "127.0.0.1", net_port+1, SRSLTE_NETSINK_TCP)) {
fprintf(stderr, "Error sink\n");
exit(-1);
}
}
if (sem_init(&net_sem, 0, 1)) {
perror("sem_init");
exit(-1);
}
}
/* create ifft object */
for (i = 0; i < cell.nof_ports; i++) {
if (srslte_ofdm_tx_init(&ifft[i], SRSLTE_CP_NORM, sf_buffer[i], output_buffer[i], cell.nof_prb)) {
fprintf(stderr, "Error creating iFFT object\n");
exit(-1);
}
srslte_ofdm_set_normalize(&ifft[i], true);
}
if (srslte_ofdm_tx_init_mbsfn(&ifft_mbsfn, SRSLTE_CP_EXT, sf_buffer[0], output_buffer[0], cell.nof_prb)) {
fprintf(stderr, "Error creating iFFT object\n");
exit(-1);
}
srslte_ofdm_set_non_mbsfn_region(&ifft_mbsfn, 2);
srslte_ofdm_set_normalize(&ifft_mbsfn, true);
if (srslte_pbch_init(&pbch)) {
fprintf(stderr, "Error creating PBCH object\n");
exit(-1);
}
if (srslte_pbch_set_cell(&pbch, cell)) {
fprintf(stderr, "Error creating PBCH object\n");
exit(-1);
}
if (srslte_regs_init(®s, cell)) {
fprintf(stderr, "Error initiating regs\n");
exit(-1);
}
if (srslte_pcfich_init(&pcfich, 1)) {
fprintf(stderr, "Error creating PBCH object\n");
exit(-1);
}
if (srslte_pcfich_set_cell(&pcfich, ®s, cell)) {
fprintf(stderr, "Error creating PBCH object\n");
exit(-1);
}
if (srslte_pdcch_init_enb(&pdcch, cell.nof_prb)) {
fprintf(stderr, "Error creating PDCCH object\n");
exit(-1);
}
if (srslte_pdcch_set_cell(&pdcch, ®s, cell)) {
fprintf(stderr, "Error creating PDCCH object\n");
exit(-1);
}
if (srslte_pdsch_init_enb(&pdsch, cell.nof_prb)) {
fprintf(stderr, "Error creating PDSCH object\n");
exit(-1);
}
if (srslte_pdsch_set_cell(&pdsch, cell)) {
fprintf(stderr, "Error creating PDSCH object\n");
exit(-1);
}
srslte_pdsch_set_rnti(&pdsch, UE_CRNTI);
if(mbsfn_area_id > -1){
if (srslte_pmch_init(&pmch, cell.nof_prb)) {
fprintf(stderr, "Error creating PMCH object\n");
}
srslte_pmch_set_area_id(&pmch, mbsfn_area_id);
}
for (i = 0; i < SRSLTE_MAX_CODEWORDS; i++) {
softbuffers[i] = calloc(sizeof(srslte_softbuffer_tx_t), 1);
if (!softbuffers[i]) {
fprintf(stderr, "Error allocating soft buffer\n");
exit(-1);
}
if (srslte_softbuffer_tx_init(softbuffers[i], cell.nof_prb)) {
fprintf(stderr, "Error initiating soft buffer\n");
exit(-1);
}
}
}
/* the gateway function */
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
int i;
srslte_cell_t cell;
srslte_ofdm_t ofdm_rx;
srslte_pdsch_t pdsch;
srslte_chest_dl_t chest;
cf_t *input_fft;
srslte_pdsch_cfg_t cfg;
srslte_softbuffer_rx_t softbuffer;
uint32_t rnti32;
uint32_t cfi;
if (nrhs < NOF_INPUTS) {
help();
return;
}
srslte_verbose = SRSLTE_VERBOSE_DEBUG;
bzero(&cfg, sizeof(srslte_pdsch_cfg_t));
if (mexutils_read_cell(ENBCFG, &cell)) {
help();
return;
}
if (mexutils_read_uint32_struct(PDSCHCFG, "RNTI", &rnti32)) {
mexErrMsgTxt("Field RNTI not found in pdsch config\n");
return;
}
if (mexutils_read_uint32_struct(ENBCFG, "CFI", &cfi)) {
help();
return;
}
if (mexutils_read_uint32_struct(ENBCFG, "NSubframe", &cfg.sf_idx)) {
help();
return;
}
if (srslte_ofdm_rx_init(&ofdm_rx, cell.cp, cell.nof_prb)) {
fprintf(stderr, "Error initializing FFT\n");
return;
}
if (srslte_pdsch_init(&pdsch, cell)) {
mexErrMsgTxt("Error initiating PDSCH\n");
return;
}
srslte_pdsch_set_rnti(&pdsch, (uint16_t) (rnti32 & 0xffff));
if (srslte_softbuffer_rx_init(&softbuffer, cell.nof_prb)) {
mexErrMsgTxt("Error initiating soft buffer\n");
return;
}
if (srslte_chest_dl_init(&chest, cell)) {
mexErrMsgTxt("Error initializing equalizer\n");
return;
}
srslte_ra_dl_grant_t grant;
grant.mcs.tbs = mxGetScalar(TBS);
if (grant.mcs.tbs == 0) {
mexErrMsgTxt("Error trblklen is zero\n");
return;
}
if (srslte_cbsegm(&cfg.cb_segm, grant.mcs.tbs)) {
mexErrMsgTxt("Error computing CB segmentation\n");
return;
}
if (mexutils_read_uint32_struct(PDSCHCFG, "RV", &cfg.rv)) {
mexErrMsgTxt("Field RV not found in pdsch config\n");
return;
}
uint32_t max_iterations = 5;
mexutils_read_uint32_struct(PDSCHCFG, "NTurboDecIts", &max_iterations);
char *mod_str = mexutils_get_char_struct(PDSCHCFG, "Modulation");
if (!strcmp(mod_str, "QPSK")) {
grant.mcs.mod = SRSLTE_MOD_QPSK;
} else if (!strcmp(mod_str, "16QAM")) {
grant.mcs.mod = SRSLTE_MOD_16QAM;
} else if (!strcmp(mod_str, "64QAM")) {
grant.mcs.mod = SRSLTE_MOD_64QAM;
} else {
mexErrMsgTxt("Unknown modulation\n");
return;
}
mxFree(mod_str);
mxArray *p;
p = mxGetField(PDSCHCFG, 0, "PRBSet");
if (!p) {
mexErrMsgTxt("Error field PRBSet not found\n");
return;
}
float *prbset_f;
uint64_t *prbset;
if (mxGetClassID(p) == mxDOUBLE_CLASS) {
grant.nof_prb = mexutils_read_f(p, &prbset_f);
prbset = malloc(sizeof(uint64_t)*grant.nof_prb);
for (i=0;i<grant.nof_prb;i++) {
prbset[i] = (uint64_t) prbset_f[i];
}
} else {
grant.nof_prb = mexutils_read_uint64(p, &prbset);
}
for (i=0;i<cell.nof_prb;i++) {
grant.prb_idx[0][i] = false;
for (int j=0;j<grant.nof_prb && !grant.prb_idx[0][i];j++) {
if ((int) prbset[j] == i) {
grant.prb_idx[0][i] = true;
}
}
grant.prb_idx[1][i] = grant.prb_idx[0][i];
}
free(prbset);
/* Configure rest of pdsch_cfg parameters */
grant.Qm = srslte_mod_bits_x_symbol(grant.mcs.mod);
if (srslte_pdsch_cfg(&cfg, cell, &grant, cfi, cfg.sf_idx, cfg.rv)) {
fprintf(stderr, "Error configuring PDSCH\n");
exit(-1);
}
/** Allocate input buffers */
int nof_retx=1;
if (mexutils_isCell(INPUT)) {
nof_retx = mexutils_getLength(INPUT);
}
cf_t *ce[SRSLTE_MAX_PORTS];
for (i=0;i<cell.nof_ports;i++) {
ce[i] = srslte_vec_malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
}
uint8_t *data_bytes = srslte_vec_malloc(sizeof(uint8_t) * grant.mcs.tbs/8);
if (!data_bytes) {
return;
}
srslte_sch_set_max_noi(&pdsch.dl_sch, max_iterations);
input_fft = NULL;
int r=-1;
for (int rvIdx=0;rvIdx<nof_retx && r != 0;rvIdx++) {
mxArray *tmp = (mxArray*) INPUT;
if (mexutils_isCell(INPUT)) {
tmp = mexutils_getCellArray(INPUT, rvIdx);
if (nof_retx > 1) {
cfg.rv = rv_seq[rvIdx%4];
}
}
// Read input signal
cf_t *input_signal = NULL;
int insignal_len = mexutils_read_cf(tmp, &input_signal);
if (insignal_len < 0) {
mexErrMsgTxt("Error reading input signal\n");
return;
}
if (insignal_len == SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp)) {
input_fft = input_signal;
} else {
input_fft = srslte_vec_malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
srslte_ofdm_rx_sf(&ofdm_rx, input_signal, input_fft);
free(input_signal);
}
if (nrhs > NOF_INPUTS) {
cf_t *cearray = NULL;
mexutils_read_cf(prhs[NOF_INPUTS], &cearray);
cf_t *cearray_ptr = cearray;
for (i=0;i<cell.nof_ports;i++) {
for (int j=0;j<SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp);j++) {
ce[i][j] = *cearray_ptr;
cearray_ptr++;
}
}
if (cearray)
free(cearray);
} else {
srslte_chest_dl_estimate(&chest, input_fft, ce, cfg.sf_idx);
}
float noise_power;
if (nrhs > NOF_INPUTS + 1) {
noise_power = mxGetScalar(prhs[NOF_INPUTS+1]);
} else if (nrhs > NOF_INPUTS) {
noise_power = 0;
} else {
noise_power = srslte_chest_dl_get_noise_estimate(&chest);
}
r = srslte_pdsch_decode(&pdsch, &cfg, &softbuffer, input_fft, ce, noise_power, data_bytes);
}
uint8_t *data = malloc(grant.mcs.tbs);
srslte_bit_unpack_vector(data_bytes, data, grant.mcs.tbs);
if (nlhs >= 1) {
plhs[0] = mxCreateLogicalScalar(r == 0);
}
if (nlhs >= 2) {
mexutils_write_uint8(data, &plhs[1], grant.mcs.tbs, 1);
}
if (nlhs >= 3) {
mexutils_write_cf(pdsch.symbols[0], &plhs[2], cfg.nbits.nof_re, 1);
}
if (nlhs >= 4) {
mexutils_write_cf(pdsch.d, &plhs[3], cfg.nbits.nof_re, 1);
}
if (nlhs >= 5) {
mexutils_write_s(pdsch.e, &plhs[4], cfg.nbits.nof_bits, 1);
}
srslte_softbuffer_rx_free(&softbuffer);
srslte_chest_dl_free(&chest);
srslte_pdsch_free(&pdsch);
srslte_ofdm_rx_free(&ofdm_rx);
for (i=0;i<cell.nof_ports;i++) {
free(ce[i]);
}
free(data_bytes);
free(data);
if (input_fft) {
free(input_fft);
}
return;
}
/* Precalculate the PDSCH scramble sequences for a given RNTI. This function takes a while
* to execute, so shall be called once the final C-RNTI has been allocated for the session.
* For the connection procedure, use srslte_pusch_encode_rnti() or srslte_pusch_decode_rnti() functions
*/
void srslte_ue_dl_set_rnti(srslte_ue_dl_t *q, uint16_t rnti) {
srslte_pdsch_set_rnti(&q->pdsch, rnti);
q->current_rnti = rnti;
}
/* the gateway function */
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
int i;
srslte_cell_t cell;
srslte_pdsch_t pdsch;
srslte_chest_dl_t chest;
srslte_ofdm_t fft;
cf_t *input_fft, *input_signal;
int nof_re;
srslte_pdsch_cfg_t cfg;
srslte_softbuffer_rx_t softbuffer;
uint32_t rnti32;
uint32_t cfi;
if (nrhs < NOF_INPUTS) {
help();
return;
}
bzero(&cfg, sizeof(srslte_pdsch_cfg_t));
if (mexutils_read_cell(ENBCFG, &cell)) {
help();
return;
}
if (mexutils_read_uint32_struct(PDSCHCFG, "RNTI", &rnti32)) {
mexErrMsgTxt("Field RNTI not found in pdsch config\n");
return;
}
if (mexutils_read_uint32_struct(ENBCFG, "CFI", &cfi)) {
help();
return;
}
if (mexutils_read_uint32_struct(ENBCFG, "NSubframe", &cfg.sf_idx)) {
help();
return;
}
if (srslte_pdsch_init(&pdsch, cell)) {
mexErrMsgTxt("Error initiating PDSCH\n");
return;
}
srslte_pdsch_set_rnti(&pdsch, (uint16_t) (rnti32 & 0xffff));
if (srslte_softbuffer_rx_init(&softbuffer, cell)) {
mexErrMsgTxt("Error initiating soft buffer\n");
return;
}
if (srslte_chest_dl_init(&chest, cell)) {
mexErrMsgTxt("Error initializing equalizer\n");
return;
}
if (srslte_ofdm_rx_init(&fft, cell.cp, cell.nof_prb)) {
mexErrMsgTxt("Error initializing FFT\n");
return;
}
nof_re = 2 * SRSLTE_CP_NORM_NSYMB * cell.nof_prb * SRSLTE_NRE;
cfg.grant.mcs.tbs = mxGetScalar(TBS);
if (cfg.grant.mcs.tbs == 0) {
mexErrMsgTxt("Error trblklen is zero\n");
return;
}
if (srslte_cbsegm(&cfg.cb_segm, cfg.grant.mcs.tbs)) {
mexErrMsgTxt("Error computing CB segmentation\n");
return;
}
if (mexutils_read_uint32_struct(PDSCHCFG, "RV", &cfg.rv)) {
mexErrMsgTxt("Field RV not found in pdsch config\n");
return;
}
char *mod_str = mexutils_get_char_struct(PDSCHCFG, "Modulation");
if (!strcmp(mod_str, "QPSK")) {
cfg.grant.mcs.mod = SRSLTE_MOD_QPSK;
} else if (!strcmp(mod_str, "16QAM")) {
cfg.grant.mcs.mod = SRSLTE_MOD_16QAM;
} else if (!strcmp(mod_str, "64QAM")) {
cfg.grant.mcs.mod = SRSLTE_MOD_64QAM;
} else {
mexErrMsgTxt("Unknown modulation\n");
return;
}
mxFree(mod_str);
float *prbset;
mxArray *p;
p = mxGetField(PDSCHCFG, 0, "PRBSet");
if (!p) {
mexErrMsgTxt("Error field PRBSet not found\n");
return;
}
// Only localized PRB supported
cfg.grant.nof_prb = mexutils_read_f(p, &prbset);
for (i=0;i<cell.nof_prb;i++) {
cfg.grant.prb_idx[0][i] = false;
for (int j=0;j<cfg.grant.nof_prb && !cfg.grant.prb_idx[0][i];j++) {
if ((int) prbset[j] == i) {
cfg.grant.prb_idx[0][i] = true;
}
}
}
memcpy(&cfg.grant.prb_idx[1], &cfg.grant.prb_idx[0], SRSLTE_MAX_PRB*sizeof(bool));
free(prbset);
srslte_dl_dci_to_grant_nof_re(&cfg.grant, cell, cfg.sf_idx, cell.nof_prb<10?(cfi+1):cfi);
// Fill rest of grant structure
cfg.grant.lstart = cell.nof_prb<10?(cfi+1):cfi;
cfg.grant.nof_symb = 2*SRSLTE_CP_NSYMB(cell.cp)-cfg.grant.lstart;
cfg.grant.Qm = srslte_mod_bits_x_symbol(cfg.grant.mcs.mod);
cfg.grant.nof_bits = cfg.grant.nof_re * cfg.grant.Qm;
/** Allocate input buffers */
if (mexutils_read_cf(INPUT, &input_signal) < 0) {
mexErrMsgTxt("Error reading input signal\n");
return;
}
input_fft = srslte_vec_malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
cf_t *ce[SRSLTE_MAX_PORTS];
for (i=0;i<cell.nof_ports;i++) {
ce[i] = srslte_vec_malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
}
srslte_ofdm_rx_sf(&fft, input_signal, input_fft);
if (nrhs > NOF_INPUTS) {
cf_t *cearray = NULL;
nof_re = mexutils_read_cf(prhs[NOF_INPUTS], &cearray);
cf_t *cearray_ptr = cearray;
for (i=0;i<cell.nof_ports;i++) {
for (int j=0;j<nof_re/cell.nof_ports;j++) {
ce[i][j] = *cearray;
cearray++;
}
}
if (cearray_ptr)
free(cearray_ptr);
} else {
srslte_chest_dl_estimate(&chest, input_fft, ce, cfg.sf_idx);
}
float noise_power;
if (nrhs > NOF_INPUTS + 1) {
noise_power = mxGetScalar(prhs[NOF_INPUTS+1]);
} else {
noise_power = srslte_chest_dl_get_noise_estimate(&chest);
}
uint8_t *data = malloc(sizeof(uint8_t) * cfg.grant.mcs.tbs);
if (!data) {
return;
}
int r = srslte_pdsch_decode(&pdsch, &cfg, &softbuffer, input_fft, ce, noise_power, data);
if (nlhs >= 1) {
plhs[0] = mxCreateLogicalScalar(r == 0);
}
if (nlhs >= 2) {
mexutils_write_uint8(data, &plhs[1], cfg.grant.mcs.tbs, 1);
}
if (nlhs >= 3) {
mexutils_write_cf(pdsch.symbols[0], &plhs[2], cfg.grant.nof_re, 1);
}
if (nlhs >= 4) {
mexutils_write_cf(pdsch.d, &plhs[3], cfg.grant.nof_re, 1);
}
if (nlhs >= 5) {
mexutils_write_f(pdsch.e, &plhs[4], cfg.grant.nof_bits, 1);
}
srslte_chest_dl_free(&chest);
srslte_ofdm_rx_free(&fft);
srslte_pdsch_free(&pdsch);
for (i=0;i<cell.nof_ports;i++) {
free(ce[i]);
}
free(data);
free(input_signal);
free(input_fft);
return;
}
