mirror of https://github.com/PentHertz/srsLTE.git
112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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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 srsran_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 SRSRAN_UE_MIB_H
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#define SRSRAN_UE_MIB_H
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#include <stdbool.h>
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#include "srsran/config.h"
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#include "srsran/phy/ch_estimation/chest_dl.h"
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#include "srsran/phy/dft/ofdm.h"
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#include "srsran/phy/phch/pbch.h"
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#include "srsran/phy/sync/cfo.h"
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#include "srsran/phy/ue/ue_sync.h"
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#define SRSRAN_UE_MIB_NOF_PRB 6
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#define SRSRAN_UE_MIB_FOUND 1
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#define SRSRAN_UE_MIB_NOTFOUND 0
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typedef struct SRSRAN_API {
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srsran_sync_t sfind;
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cf_t* sf_symbols;
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srsran_ofdm_t fft;
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srsran_pbch_t pbch;
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srsran_chest_dl_t chest;
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srsran_chest_dl_res_t chest_res;
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uint8_t bch_payload[SRSRAN_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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} srsran_ue_mib_t;
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SRSRAN_API int srsran_ue_mib_init(srsran_ue_mib_t* q, cf_t* in_buffer, uint32_t max_prb);
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SRSRAN_API void srsran_ue_mib_free(srsran_ue_mib_t* q);
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SRSRAN_API int srsran_ue_mib_set_cell(srsran_ue_mib_t* q, srsran_cell_t cell);
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SRSRAN_API void srsran_ue_mib_reset(srsran_ue_mib_t* q);
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SRSRAN_API int srsran_ue_mib_decode(srsran_ue_mib_t* q,
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uint8_t bch_payload[SRSRAN_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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srsran_ue_mib_t ue_mib;
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srsran_ue_sync_t ue_sync;
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cf_t* sf_buffer[SRSRAN_MAX_CHANNELS];
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uint32_t nof_rx_channels;
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} srsran_ue_mib_sync_t;
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SRSRAN_API int
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srsran_ue_mib_sync_init_multi(srsran_ue_mib_sync_t* q,
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int(recv_callback)(void*, cf_t* [SRSRAN_MAX_CHANNELS], uint32_t, srsran_timestamp_t*),
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uint32_t nof_rx_channels,
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void* stream_handler);
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SRSRAN_API void srsran_ue_mib_sync_free(srsran_ue_mib_sync_t* q);
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SRSRAN_API int srsran_ue_mib_sync_set_cell(srsran_ue_mib_sync_t* q, srsran_cell_t cell);
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SRSRAN_API void srsran_ue_mib_sync_reset(srsran_ue_mib_sync_t* q);
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SRSRAN_API int srsran_ue_mib_sync_decode(srsran_ue_mib_sync_t* q,
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uint32_t max_frames_timeout,
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uint8_t bch_payload[SRSRAN_BCH_PAYLOAD_LEN],
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uint32_t* nof_tx_ports,
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int* sfn_offset);
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#endif // SRSRAN_UE_MIB_H
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