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112 lines
4.1 KiB
C
112 lines
4.1 KiB
C
/*
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* Copyright 2013-2020 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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#ifndef SRSLTE_UE_MIB_NBIOT_H
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#define SRSLTE_UE_MIB_NBIOT_H
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#include "srslte/config.h"
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#include "srslte/phy/ch_estimation/chest_dl_nbiot.h"
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#include "srslte/phy/dft/ofdm.h"
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#include "srslte/phy/phch/npbch.h"
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#include "srslte/phy/sync/cfo.h"
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#include "srslte/phy/ue/ue_sync_nbiot.h"
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#define SRSLTE_UE_MIB_NBIOT_NOF_PRB 6
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#define SRSLTE_UE_MIB_NBIOT_FOUND 1
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#define SRSLTE_UE_MIB_NBIOT_NOTFOUND 0
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/**
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* \brief This object decodes the MIB-NB from the NPBCH of an NB-IoT LTE signal.
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*
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* The function srslte_ue_mib_nbiot_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 NPSS sequence and
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* decode the NPBCH 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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typedef struct SRSLTE_API {
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srslte_sync_nbiot_t sfind;
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cf_t* sf_symbols;
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cf_t* ce[SRSLTE_MAX_PORTS];
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srslte_ofdm_t fft;
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srslte_chest_dl_nbiot_t chest;
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srslte_npbch_t npbch;
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uint8_t last_bch_payload[SRSLTE_MIB_NB_LEN];
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uint32_t nof_tx_ports;
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uint32_t nof_rx_antennas;
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uint32_t sfn_offset;
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uint32_t frame_cnt;
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} srslte_ue_mib_nbiot_t;
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SRSLTE_API int srslte_ue_mib_nbiot_init(srslte_ue_mib_nbiot_t* q, cf_t** in_buffer, uint32_t max_prb);
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SRSLTE_API int srslte_ue_mib_nbiot_set_cell(srslte_ue_mib_nbiot_t* q, srslte_nbiot_cell_t cell);
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SRSLTE_API void srslte_ue_mib_nbiot_free(srslte_ue_mib_nbiot_t* q);
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SRSLTE_API void srslte_ue_mib_nbiot_reset(srslte_ue_mib_nbiot_t* q);
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SRSLTE_API int srslte_ue_mib_nbiot_decode(srslte_ue_mib_nbiot_t* q,
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cf_t* input,
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uint8_t* bch_payload,
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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_nbiot_t ue_mib;
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srslte_nbiot_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_nbiot_t;
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SRSLTE_API int
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srslte_ue_mib_sync_nbiot_init_multi(srslte_ue_mib_sync_nbiot_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_nbiot_free(srslte_ue_mib_sync_nbiot_t* q);
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SRSLTE_API int srslte_ue_mib_sync_nbiot_set_cell(srslte_ue_mib_sync_nbiot_t* q, srslte_nbiot_cell_t cell);
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SRSLTE_API void srslte_ue_mib_sync_nbiot_reset(srslte_ue_mib_sync_nbiot_t* q);
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SRSLTE_API int srslte_ue_mib_sync_nbiot_decode(srslte_ue_mib_sync_nbiot_t* q,
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uint32_t max_frames_timeout,
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uint8_t* bch_payload,
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uint32_t* nof_tx_ports,
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int* sfn_offset);
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#endif // SRSLTE_UE_MIB_NBIOT_H
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