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C

/**
* Copyright 2013-2021 Software Radio Systems Limited
*
* This file is part of srsLTE.
*
* srsLTE is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* srsLTE is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* A copy of the GNU Affero General Public License can be found in
* the LICENSE file in the top-level directory of this distribution
* and at http://www.gnu.org/licenses/.
*
*/
/******************************************************************************
* File: pbch.h
*
* Description: Physical broadcast channel. If cell.nof_ports = 0, the number
* of ports is blindly determined using the CRC of the received
* codeword for 1, 2 and 4 ports
*
* Reference: 3GPP TS 36.211 version 10.0.0 Release 10 Sec. 6.6
*****************************************************************************/
#ifndef SRSLTE_PBCH_H
#define SRSLTE_PBCH_H
#include "srslte/config.h"
#include "srslte/phy/ch_estimation/chest_dl.h"
#include "srslte/phy/common/phy_common.h"
#include "srslte/phy/fec/convolutional/convcoder.h"
#include "srslte/phy/fec/convolutional/rm_conv.h"
#include "srslte/phy/fec/convolutional/viterbi.h"
#include "srslte/phy/fec/crc.h"
#include "srslte/phy/mimo/layermap.h"
#include "srslte/phy/mimo/precoding.h"
#include "srslte/phy/modem/demod_soft.h"
#include "srslte/phy/modem/mod.h"
#include "srslte/phy/scrambling/scrambling.h"
#define SRSLTE_BCH_PAYLOAD_LEN 24
#define SRSLTE_BCH_PAYLOADCRC_LEN (SRSLTE_BCH_PAYLOAD_LEN + 16)
#define SRSLTE_BCH_ENCODED_LEN 3 * (SRSLTE_BCH_PAYLOADCRC_LEN)
#define SRSLTE_PBCH_MAX_RE 256 // make it avx2-aligned
/* PBCH object */
typedef struct SRSLTE_API {
srslte_cell_t cell;
uint32_t nof_symbols;
/* buffers */
cf_t* ce[SRSLTE_MAX_PORTS];
cf_t* symbols[SRSLTE_MAX_PORTS];
cf_t* x[SRSLTE_MAX_PORTS];
cf_t* d;
float* llr;
float* temp;
float rm_f[SRSLTE_BCH_ENCODED_LEN];
uint8_t* rm_b;
uint8_t data[SRSLTE_BCH_PAYLOADCRC_LEN];
uint8_t data_enc[SRSLTE_BCH_ENCODED_LEN];
uint32_t frame_idx;
/* tx & rx objects */
srslte_modem_table_t mod;
srslte_sequence_t seq;
srslte_viterbi_t decoder;
srslte_crc_t crc;
srslte_convcoder_t encoder;
bool search_all_ports;
} srslte_pbch_t;
SRSLTE_API int srslte_pbch_init(srslte_pbch_t* q);
SRSLTE_API void srslte_pbch_free(srslte_pbch_t* q);
SRSLTE_API int srslte_pbch_set_cell(srslte_pbch_t* q, srslte_cell_t cell);
SRSLTE_API int srslte_pbch_decode(srslte_pbch_t* q,
srslte_chest_dl_res_t* channel,
cf_t* sf_symbols[SRSLTE_MAX_PORTS],
uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN],
uint32_t* nof_tx_ports,
int* sfn_offset);
SRSLTE_API int srslte_pbch_encode(srslte_pbch_t* q,
uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN],
cf_t* sf_symbols[SRSLTE_MAX_PORTS],
uint32_t frame_idx);
SRSLTE_API void srslte_pbch_decode_reset(srslte_pbch_t* q);
SRSLTE_API void srslte_pbch_mib_unpack(uint8_t* msg, srslte_cell_t* cell, uint32_t* sfn);
SRSLTE_API void srslte_pbch_mib_pack(srslte_cell_t* cell, uint32_t sfn, uint8_t* msg);
#endif // SRSLTE_PBCH_H