int srslte_ue_mib_set_cell(srslte_ue_mib_t * q, srslte_cell_t cell) { int ret = SRSLTE_ERROR_INVALID_INPUTS; if (q != NULL && cell.nof_ports <= SRSLTE_MAX_PORTS) { if (srslte_pbch_set_cell(&q->pbch, cell)) { fprintf(stderr, "Error initiating PBCH\n"); return SRSLTE_ERROR; } if (srslte_ofdm_rx_set_prb(&q->fft, cell.cp, cell.nof_prb)) { fprintf(stderr, "Error initializing FFT\n"); return SRSLTE_ERROR; } if (cell.nof_ports == 0) { cell.nof_ports = SRSLTE_MAX_PORTS; } if (srslte_chest_dl_set_cell(&q->chest, cell)) { fprintf(stderr, "Error initializing reference signal\n"); return SRSLTE_ERROR; } srslte_ue_mib_reset(q); ret = SRSLTE_SUCCESS; } return ret; }
int srslte_ue_mib_decode(srslte_ue_mib_t * q, uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN], uint32_t *nof_tx_ports, int *sfn_offset) { int ret = SRSLTE_SUCCESS; cf_t *ce_slot1[SRSLTE_MAX_PORTS]; /* Run FFT for the slot symbols */ srslte_ofdm_rx_sf(&q->fft); /* Get channel estimates of sf idx #0 for each port */ ret = srslte_chest_dl_estimate(&q->chest, q->sf_symbols, q->ce, 0); if (ret < 0) { return SRSLTE_ERROR; } /* Reset decoder if we missed a frame */ if (q->frame_cnt > 8) { INFO("Resetting PBCH decoder after %d frames\n", q->frame_cnt); srslte_ue_mib_reset(q); } for (int i=0;i<SRSLTE_MAX_PORTS;i++) { ce_slot1[i] = &q->ce[i][SRSLTE_SLOT_LEN_RE(q->chest.cell.nof_prb, q->chest.cell.cp)]; } /* Decode PBCH */ ret = srslte_pbch_decode(&q->pbch, &q->sf_symbols[SRSLTE_SLOT_LEN_RE(q->chest.cell.nof_prb, q->chest.cell.cp)], ce_slot1, 0, bch_payload, nof_tx_ports, sfn_offset); if (ret < 0) { fprintf(stderr, "Error decoding PBCH (%d)\n", ret); } else if (ret == 1) { INFO("MIB decoded: %u\n", q->frame_cnt); srslte_ue_mib_reset(q); ret = SRSLTE_UE_MIB_FOUND; } else { ret = SRSLTE_UE_MIB_NOTFOUND; INFO("MIB not decoded: %u\n", q->frame_cnt); q->frame_cnt++; } return ret; }
int srslte_ue_mib_init(srslte_ue_mib_t * q, srslte_cell_t cell) { int ret = SRSLTE_ERROR_INVALID_INPUTS; if (q != NULL && cell.nof_ports <= SRSLTE_MAX_PORTS) { ret = SRSLTE_ERROR; bzero(q, sizeof(srslte_ue_mib_t)); if (srslte_pbch_init(&q->pbch, cell)) { fprintf(stderr, "Error initiating PBCH\n"); goto clean_exit; } if (cell.nof_ports == 0) { cell.nof_ports = SRSLTE_MAX_PORTS; } q->sf_symbols = srslte_vec_malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t)); if (!q->sf_symbols) { perror("malloc"); goto clean_exit; } for (int i=0;i<cell.nof_ports;i++) { q->ce[i] = srslte_vec_malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t)); if (!q->ce[i]) { perror("malloc"); goto clean_exit; } } if (srslte_ofdm_rx_init(&q->fft, cell.cp, cell.nof_prb)) { fprintf(stderr, "Error initializing FFT\n"); goto clean_exit; } if (srslte_chest_dl_init(&q->chest, cell)) { fprintf(stderr, "Error initializing reference signal\n"); goto clean_exit; } srslte_ue_mib_reset(q); ret = SRSLTE_SUCCESS; } clean_exit: if (ret == SRSLTE_ERROR) { srslte_ue_mib_free(q); } return ret; }
int srslte_ue_mib_init(srslte_ue_mib_t * q, cf_t *in_buffer[SRSLTE_MAX_PORTS], uint32_t max_prb) { int ret = SRSLTE_ERROR_INVALID_INPUTS; if (q != NULL) { ret = SRSLTE_ERROR; bzero(q, sizeof(srslte_ue_mib_t)); if (srslte_pbch_init(&q->pbch)) { fprintf(stderr, "Error initiating PBCH\n"); goto clean_exit; } q->sf_symbols = srslte_vec_malloc(SRSLTE_SF_LEN_RE(max_prb, SRSLTE_CP_NORM) * sizeof(cf_t)); if (!q->sf_symbols) { perror("malloc"); goto clean_exit; } for (int i=0;i<SRSLTE_MAX_PORTS;i++) { q->ce[i] = srslte_vec_malloc(SRSLTE_SF_LEN_RE(max_prb, SRSLTE_CP_NORM) * sizeof(cf_t)); if (!q->ce[i]) { perror("malloc"); goto clean_exit; } } if (srslte_ofdm_rx_init(&q->fft, SRSLTE_CP_NORM, in_buffer[0], q->sf_symbols, max_prb)) { fprintf(stderr, "Error initializing FFT\n"); goto clean_exit; } if (srslte_chest_dl_init(&q->chest, max_prb)) { fprintf(stderr, "Error initializing reference signal\n"); goto clean_exit; } srslte_ue_mib_reset(q); ret = SRSLTE_SUCCESS; } clean_exit: if (ret == SRSLTE_ERROR) { srslte_ue_mib_free(q); } return ret; }
int srslte_ue_mib_sync_decode(srslte_ue_mib_sync_t * q, uint32_t max_frames_timeout, uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN], uint32_t *nof_tx_ports, int *sfn_offset) { int ret = SRSLTE_ERROR_INVALID_INPUTS; uint32_t nof_frames = 0; int mib_ret = SRSLTE_UE_MIB_NOTFOUND; if (q != NULL) { srslte_ue_mib_sync_reset(q); ret = SRSLTE_SUCCESS; do { mib_ret = SRSLTE_UE_MIB_NOTFOUND; ret = srslte_ue_sync_zerocopy_multi(&q->ue_sync, q->sf_buffer); if (ret < 0) { fprintf(stderr, "Error calling srslte_ue_sync_work()\n"); return -1; } else if (srslte_ue_sync_get_sfidx(&q->ue_sync) == 0) { if (ret == 1) { mib_ret = srslte_ue_mib_decode(&q->ue_mib, bch_payload, nof_tx_ports, sfn_offset); } else { DEBUG("Resetting PBCH decoder after %d frames\n", q->ue_mib.frame_cnt); srslte_ue_mib_reset(&q->ue_mib); } nof_frames++; } } while (mib_ret == SRSLTE_UE_MIB_NOTFOUND && ret >= 0 && nof_frames < max_frames_timeout); if (mib_ret < 0) { ret = mib_ret; } } return mib_ret; }
void srslte_ue_mib_sync_reset(srslte_ue_mib_sync_t * q) { srslte_ue_mib_reset(&q->ue_mib); srslte_ue_sync_reset(&q->ue_sync); }