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127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/*
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* Copyright 2013-2019 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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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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/******************************************************************************
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* File: ue_mib.h
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*
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* Description: This object decodes the MIB from the PBCH of an LTE signal.
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*
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* The function srslte_ue_mib_decode() shall be called multiple
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* times, each passing a number of samples multiple of 19200,
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* sampled at 1.92 MHz (that is, 10 ms of samples).
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*
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* The function uses the sync_t object to find the PSS sequence and
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* decode the PBCH to obtain the MIB.
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*
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* The function returns 0 until the MIB is decoded.
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*
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* See ue_cell_detect.c for an example.
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*
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* Reference:
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*****************************************************************************/
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#ifndef SRSLTE_UE_MIB_H
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#define SRSLTE_UE_MIB_H
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#include <stdbool.h>
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#include "srslte/config.h"
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#include "srslte/phy/ue/ue_sync.h"
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#include "srslte/phy/sync/cfo.h"
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#include "srslte/phy/ch_estimation/chest_dl.h"
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#include "srslte/phy/phch/pbch.h"
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#include "srslte/phy/dft/ofdm.h"
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#define SRSLTE_UE_MIB_NOF_PRB 6
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#define SRSLTE_UE_MIB_FOUND 1
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#define SRSLTE_UE_MIB_NOTFOUND 0
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typedef struct SRSLTE_API {
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srslte_sync_t sfind;
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cf_t* sf_symbols[SRSLTE_MAX_PORTS];
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srslte_ofdm_t fft;
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srslte_pbch_t pbch;
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srslte_chest_dl_t chest;
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srslte_chest_dl_res_t chest_res;
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uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN];
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uint32_t nof_tx_ports;
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uint32_t sfn_offset;
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uint32_t frame_cnt;
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} srslte_ue_mib_t;
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SRSLTE_API int srslte_ue_mib_init(srslte_ue_mib_t *q,
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cf_t *in_buffer[SRSLTE_MAX_PORTS],
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uint32_t max_prb);
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SRSLTE_API void srslte_ue_mib_free(srslte_ue_mib_t *q);
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SRSLTE_API int srslte_ue_mib_set_cell(srslte_ue_mib_t * q,
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srslte_cell_t cell);
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SRSLTE_API void srslte_ue_mib_reset(srslte_ue_mib_t * q);
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SRSLTE_API int srslte_ue_mib_decode(srslte_ue_mib_t * q,
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uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN],
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uint32_t *nof_tx_ports,
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int *sfn_offset);
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/* This interface uses ue_mib and ue_sync to first get synchronized subframes
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* and then decode MIB
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*
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* This object calls the pbch object with nof_ports=0 for blind nof_ports determination
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*/
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typedef struct {
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srslte_ue_mib_t ue_mib;
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srslte_ue_sync_t ue_sync;
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cf_t *sf_buffer[SRSLTE_MAX_PORTS];
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uint32_t nof_rx_antennas;
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} srslte_ue_mib_sync_t;
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SRSLTE_API int srslte_ue_mib_sync_init_multi(srslte_ue_mib_sync_t *q,
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int (recv_callback)(void*, cf_t*[SRSLTE_MAX_PORTS], uint32_t, srslte_timestamp_t *),
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uint32_t nof_rx_antennas,
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void *stream_handler);
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SRSLTE_API void srslte_ue_mib_sync_free(srslte_ue_mib_sync_t *q);
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SRSLTE_API int srslte_ue_mib_sync_set_cell(srslte_ue_mib_sync_t* q, srslte_cell_t cell);
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SRSLTE_API void srslte_ue_mib_sync_reset(srslte_ue_mib_sync_t * q);
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SRSLTE_API int srslte_ue_mib_sync_decode(srslte_ue_mib_sync_t * q,
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uint32_t max_frames_timeout,
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uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN],
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uint32_t *nof_tx_ports,
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int *sfn_offset);
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#endif // SRSLTE_UE_MIB_H
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