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155 lines
6.5 KiB
C
155 lines
6.5 KiB
C
/**
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* Copyright 2013-2022 Software Radio Systems Limited
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*
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* This file is part of srsRAN.
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*
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* srsRAN 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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* srsRAN 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: pdcch.h
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*
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* Description: Physical downlink control channel.
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*
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* Reference: 3GPP TS 36.211 version 10.0.0 Release 10 Sec. 6.8
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*****************************************************************************/
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#ifndef SRSRAN_PDCCH_H
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#define SRSRAN_PDCCH_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/common/phy_common.h"
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#include "srsran/phy/fec/convolutional/convcoder.h"
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#include "srsran/phy/fec/convolutional/rm_conv.h"
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#include "srsran/phy/fec/convolutional/viterbi.h"
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#include "srsran/phy/fec/crc.h"
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#include "srsran/phy/mimo/layermap.h"
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#include "srsran/phy/mimo/precoding.h"
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#include "srsran/phy/modem/demod_soft.h"
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#include "srsran/phy/modem/mod.h"
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#include "srsran/phy/phch/dci.h"
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#include "srsran/phy/phch/regs.h"
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#include "srsran/phy/scrambling/scrambling.h"
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typedef enum SRSRAN_API { SEARCH_UE, SEARCH_COMMON } srsran_pdcch_search_mode_t;
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/* PDCCH object */
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typedef struct SRSRAN_API {
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srsran_cell_t cell;
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uint32_t nof_regs[3];
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uint32_t nof_cce[3];
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uint32_t max_bits;
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uint32_t nof_rx_antennas;
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bool is_ue;
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srsran_regs_t* regs;
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/* buffers */
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cf_t* ce[SRSRAN_MAX_PORTS][SRSRAN_MAX_PORTS];
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cf_t* symbols[SRSRAN_MAX_PORTS];
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cf_t* x[SRSRAN_MAX_PORTS];
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cf_t* d;
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uint8_t* e;
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float rm_f[3 * (SRSRAN_DCI_MAX_BITS + 16)];
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float* llr;
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/* tx & rx objects */
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srsran_modem_table_t mod;
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srsran_sequence_t seq[SRSRAN_NOF_SF_X_FRAME];
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srsran_viterbi_t decoder;
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srsran_crc_t crc;
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} srsran_pdcch_t;
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SRSRAN_API int srsran_pdcch_init_ue(srsran_pdcch_t* q, uint32_t max_prb, uint32_t nof_rx_antennas);
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SRSRAN_API int srsran_pdcch_init_enb(srsran_pdcch_t* q, uint32_t max_prb);
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SRSRAN_API int srsran_pdcch_set_cell(srsran_pdcch_t* q, srsran_regs_t* regs, srsran_cell_t cell);
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SRSRAN_API void srsran_pdcch_set_regs(srsran_pdcch_t* q, srsran_regs_t* regs);
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SRSRAN_API void srsran_pdcch_free(srsran_pdcch_t* q);
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SRSRAN_API float srsran_pdcch_coderate(uint32_t nof_bits, uint32_t l);
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/* Encoding function */
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SRSRAN_API int srsran_pdcch_encode(srsran_pdcch_t* q,
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srsran_dl_sf_cfg_t* sf,
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srsran_dci_msg_t* msg,
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cf_t* sf_symbols[SRSRAN_MAX_PORTS]);
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/* Decoding functions: Extract the LLRs and save them in the srsran_pdcch_t object */
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SRSRAN_API int srsran_pdcch_extract_llr(srsran_pdcch_t* q,
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srsran_dl_sf_cfg_t* sf,
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srsran_chest_dl_res_t* channel,
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cf_t* sf_symbols[SRSRAN_MAX_PORTS]);
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/* Decoding functions: Try to decode a DCI message after calling srsran_pdcch_extract_llr */
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SRSRAN_API int
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srsran_pdcch_decode_msg(srsran_pdcch_t* q, srsran_dl_sf_cfg_t* sf, srsran_dci_cfg_t* dci_cfg, srsran_dci_msg_t* msg);
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/**
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* @brief Computes decoded DCI correlation. It encodes the given DCI message and compares it with the received LLRs
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* @param q PDCCH object
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* @param msg Previously decoded DCI message
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* @return The normalized correlation between the restored symbols and the received LLRs
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*/
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SRSRAN_API float srsran_pdcch_msg_corr(srsran_pdcch_t* q, srsran_dci_msg_t* msg);
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SRSRAN_API int
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srsran_pdcch_dci_decode(srsran_pdcch_t* q, float* e, uint8_t* data, uint32_t E, uint32_t nof_bits, uint16_t* crc);
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SRSRAN_API int
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srsran_pdcch_dci_encode(srsran_pdcch_t* q, uint8_t* data, uint8_t* e, uint32_t nof_bits, uint32_t E, uint16_t rnti);
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SRSRAN_API void
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srsran_pdcch_dci_encode_conv(srsran_pdcch_t* q, uint8_t* data, uint32_t nof_bits, uint8_t* coded_data, uint16_t rnti);
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/* Function for generation of UE-specific search space DCI locations */
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SRSRAN_API uint32_t srsran_pdcch_ue_locations(srsran_pdcch_t* q,
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srsran_dl_sf_cfg_t* sf,
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srsran_dci_location_t* locations,
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uint32_t max_locations,
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uint16_t rnti);
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SRSRAN_API uint32_t srsran_pdcch_ue_locations_ncce(uint32_t nof_cce,
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srsran_dci_location_t* c,
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uint32_t max_candidates,
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uint32_t sf_idx,
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uint16_t rnti);
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SRSRAN_API uint32_t srsran_pdcch_ue_locations_ncce_L(uint32_t nof_cce,
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srsran_dci_location_t* c,
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uint32_t max_candidates,
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uint32_t sf_idx,
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uint16_t rnti,
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int L);
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/* Function for generation of common search space DCI locations */
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SRSRAN_API uint32_t srsran_pdcch_common_locations(srsran_pdcch_t* q,
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srsran_dci_location_t* locations,
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uint32_t max_locations,
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uint32_t cfi);
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SRSRAN_API uint32_t srsran_pdcch_common_locations_ncce(uint32_t nof_cce,
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srsran_dci_location_t* c,
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uint32_t max_candidates);
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#endif // SRSRAN_PDCCH_H
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