int srslte_pmch_encode(srslte_pmch_t *q,
srslte_pdsch_cfg_t *cfg, srslte_softbuffer_tx_t *softbuffer,
uint8_t *data, uint16_t area_id, cf_t *sf_symbols[SRSLTE_MAX_PORTS])
{
int i;
/* Set pointers for layermapping & precoding */
cf_t *x[SRSLTE_MAX_LAYERS];
int ret = SRSLTE_ERROR_INVALID_INPUTS;
if (q != NULL && cfg != NULL)
{
for (i=0;i<q->cell.nof_ports;i++) {
if (sf_symbols[i] == NULL) {
return SRSLTE_ERROR_INVALID_INPUTS;
}
}
if (cfg->grant.mcs[0].tbs == 0) {
return SRSLTE_ERROR_INVALID_INPUTS;
}
if (cfg->nbits[0].nof_re > q->max_re) {
fprintf(stderr,
"Error too many RE per subframe (%d). PMCH configured for %d RE (%d PRB)\n",
cfg->nbits[0].nof_re, q->max_re, q->cell.nof_prb);
return SRSLTE_ERROR_INVALID_INPUTS;
}
INFO("Encoding PMCH SF: %d, Mod %s, NofBits: %d, NofSymbols: %d, NofBitsE: %d, rv_idx: %d\n",
cfg->sf_idx, srslte_mod_string(cfg->grant.mcs[0].mod), cfg->grant.mcs[0].tbs,
cfg->nbits[0].nof_re, cfg->nbits[0].nof_bits, 0);
/* number of layers equals number of ports */
for (i = 0; i < q->cell.nof_ports; i++) {
x[i] = q->x[i];
}
memset(&x[q->cell.nof_ports], 0, sizeof(cf_t*) * (SRSLTE_MAX_LAYERS - q->cell.nof_ports));
// TODO: use tb_encode directly
if (srslte_dlsch_encode(&q->dl_sch, cfg, softbuffer, data, q->e)) {
fprintf(stderr, "Error encoding TB\n");
return SRSLTE_ERROR;
}
/* scramble */
srslte_scrambling_bytes(&q->seqs[area_id]->seq[cfg->sf_idx], (uint8_t*) q->e, cfg->nbits[0].nof_bits);
srslte_mod_modulate_bytes(&q->mod[cfg->grant.mcs[0].mod], (uint8_t*) q->e, q->d, cfg->nbits[0].nof_bits);
/* No tx diversity in MBSFN */
memcpy(q->symbols[0], q->d, cfg->nbits[0].nof_re * sizeof(cf_t));
/* mapping to resource elements */
for (i = 0; i < q->cell.nof_ports; i++) {
srslte_pmch_put(q, q->symbols[i], sf_symbols[i], cfg->nbits[0].lstart);
}
ret = SRSLTE_SUCCESS;
}
return ret;
}
/** Converts the PDSCH data bits to symbols mapped to the slot ready for transmission
*/
int srslte_pdsch_encode_rnti(srslte_pdsch_t *q,
srslte_pdsch_cfg_t *cfg, srslte_softbuffer_tx_t *softbuffer,
uint8_t *data, uint16_t rnti, cf_t *sf_symbols[SRSLTE_MAX_PORTS])
{
int i;
/* Set pointers for layermapping & precoding */
cf_t *x[SRSLTE_MAX_LAYERS];
int ret = SRSLTE_ERROR_INVALID_INPUTS;
if (q != NULL &&
data != NULL &&
cfg != NULL)
{
for (i=0; i<q->cell.nof_ports; i++) {
if (sf_symbols[i] == NULL) {
return SRSLTE_ERROR_INVALID_INPUTS;
}
}
if (cfg->grant.mcs.tbs == 0) {
return SRSLTE_ERROR_INVALID_INPUTS;
}
if (cfg->nbits.nof_re > q->max_re) {
fprintf(stderr,
"Error too many RE per subframe (%d). PDSCH configured for %d RE (%d PRB)\n",
cfg->nbits.nof_re, q->max_re, q->cell.nof_prb);
return SRSLTE_ERROR_INVALID_INPUTS;
}
INFO("Encoding PDSCH SF: %d, Mod %s, NofBits: %d, NofSymbols: %d, NofBitsE: %d, rv_idx: %d\n",
cfg->sf_idx, srslte_mod_string(cfg->grant.mcs.mod), cfg->grant.mcs.tbs,
cfg->nbits.nof_re, cfg->nbits.nof_bits, cfg->rv);
/* number of layers equals number of ports */
for (i = 0; i < q->cell.nof_ports; i++) {
x[i] = q->x[i];
}
memset(&x[q->cell.nof_ports], 0, sizeof(cf_t*) * (SRSLTE_MAX_LAYERS - q->cell.nof_ports));
if (srslte_dlsch_encode(&q->dl_sch, cfg, softbuffer, data, q->e)) {
fprintf(stderr, "Error encoding TB\n");
return SRSLTE_ERROR;
}
if (rnti != q->rnti) {
srslte_sequence_t seq;
if (srslte_sequence_pdsch(&seq, rnti, 0, 2 * cfg->sf_idx, q->cell.id, cfg->nbits.nof_bits)) {
return SRSLTE_ERROR;
}
srslte_scrambling_bytes_offset(&seq, (uint8_t*) q->e, 0, cfg->nbits.nof_bits);
srslte_sequence_free(&seq);
} else {
srslte_scrambling_bytes_offset(&q->seq[cfg->sf_idx], (uint8_t*) q->e, 0, cfg->nbits.nof_bits);
}
srslte_mod_modulate_bytes(&q->mod[cfg->grant.mcs.mod], (uint8_t*) q->e, q->d, cfg->nbits.nof_bits);
/* TODO: only diversity supported */
if (q->cell.nof_ports > 1) {
srslte_layermap_diversity(q->d, x, q->cell.nof_ports, cfg->nbits.nof_re);
srslte_precoding_diversity(&q->precoding, x, q->symbols, q->cell.nof_ports,
cfg->nbits.nof_re / q->cell.nof_ports);
} else {
memcpy(q->symbols[0], q->d, cfg->nbits.nof_re * sizeof(cf_t));
}
/* mapping to resource elements */
for (i = 0; i < q->cell.nof_ports; i++) {
srslte_pdsch_put(q, q->symbols[i], sf_symbols[i], &cfg->grant, cfg->nbits.lstart, cfg->sf_idx);
}
ret = SRSLTE_SUCCESS;
}
return ret;
}