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196 lines
7.6 KiB
C
196 lines
7.6 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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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: 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 PDCCH_
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#define PDCCH_
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#include "srslte/config.h"
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#include "srslte/phy/common/phy_common.h"
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#include "srslte/phy/mimo/precoding.h"
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#include "srslte/phy/mimo/layermap.h"
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#include "srslte/phy/modem/mod.h"
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#include "srslte/phy/modem/demod_soft.h"
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#include "srslte/phy/scrambling/scrambling.h"
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#include "srslte/phy/fec/rm_conv.h"
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#include "srslte/phy/fec/convcoder.h"
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#include "srslte/phy/fec/viterbi.h"
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#include "srslte/phy/fec/crc.h"
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#include "srslte/phy/phch/dci.h"
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#include "srslte/phy/phch/regs.h"
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typedef enum SRSLTE_API {
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SEARCH_UE, SEARCH_COMMON
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} srslte_pdcch_search_mode_t;
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/* PDCCH object */
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typedef struct SRSLTE_API {
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srslte_cell_t cell;
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uint32_t nof_regs;
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uint32_t nof_cce;
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uint32_t max_bits;
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uint32_t nof_rx_antennas;
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srslte_regs_t *regs;
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/* buffers */
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cf_t *ce[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS];
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cf_t *symbols[SRSLTE_MAX_PORTS];
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cf_t *x[SRSLTE_MAX_PORTS];
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cf_t *d;
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uint8_t *e;
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float rm_f[3 * (SRSLTE_DCI_MAX_BITS + 16)];
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float *llr;
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/* tx & rx objects */
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srslte_modem_table_t mod;
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srslte_sequence_t seq[SRSLTE_NSUBFRAMES_X_FRAME];
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srslte_viterbi_t decoder;
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srslte_crc_t crc;
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} srslte_pdcch_t;
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SRSLTE_API int srslte_pdcch_init(srslte_pdcch_t *q,
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srslte_regs_t *regs,
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srslte_cell_t cell);
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SRSLTE_API int srslte_pdcch_init_tx(srslte_pdcch_t *q,
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srslte_regs_t *regs,
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srslte_cell_t cell);
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SRSLTE_API int srslte_pdcch_init_rx(srslte_pdcch_t *q,
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srslte_regs_t *regs,
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srslte_cell_t cell,
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uint32_t nof_rx_antennas);
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SRSLTE_API int srslte_pdcch_init_multi(srslte_pdcch_t *q,
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srslte_regs_t *regs,
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srslte_cell_t cell,
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uint32_t nof_rx_antennas);
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SRSLTE_API int srslte_pdcch_init_txrx(srslte_pdcch_t *q,
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srslte_regs_t *regs,
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srslte_cell_t cell,
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uint32_t nof_rx_antennas,
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bool isReceiver);
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SRSLTE_API void srslte_pdcch_free(srslte_pdcch_t *q);
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SRSLTE_API void srslte_pdcch_set_cfi(srslte_pdcch_t *q,
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uint32_t cfi);
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SRSLTE_API float srslte_pdcch_coderate(uint32_t nof_bits,
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uint32_t l);
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/* Encoding function */
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SRSLTE_API int srslte_pdcch_encode(srslte_pdcch_t *q,
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srslte_dci_msg_t *msg,
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srslte_dci_location_t location,
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uint16_t rnti,
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cf_t *sf_symbols[SRSLTE_MAX_PORTS],
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uint32_t nsubframe,
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uint32_t cfi);
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/* Decoding functions: Extract the LLRs and save them in the srslte_pdcch_t object */
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SRSLTE_API int srslte_pdcch_extract_llr(srslte_pdcch_t *q,
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cf_t *sf_symbols,
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cf_t *ce[SRSLTE_MAX_PORTS],
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float noise_estimate,
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uint32_t nsubframe,
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uint32_t cfi);
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SRSLTE_API int srslte_pdcch_extract_llr_multi(srslte_pdcch_t *q,
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cf_t *sf_symbols[SRSLTE_MAX_PORTS],
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cf_t *ce[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS],
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float noise_estimate,
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uint32_t nsubframe,
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uint32_t cfi);
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/* Decoding functions: Try to decode a DCI message after calling srslte_pdcch_extract_llr */
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SRSLTE_API int srslte_pdcch_decode_msg(srslte_pdcch_t *q,
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srslte_dci_msg_t *msg,
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srslte_dci_location_t *location,
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srslte_dci_format_t format,
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uint16_t *crc_rem);
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SRSLTE_API int srslte_pdcch_dci_decode(srslte_pdcch_t *q,
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float *e,
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uint8_t *data,
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uint32_t E,
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uint32_t nof_bits,
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uint16_t *crc);
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SRSLTE_API int srslte_pdcch_dci_encode(srslte_pdcch_t *q,
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uint8_t *data,
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uint8_t *e,
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uint32_t nof_bits,
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uint32_t E,
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uint16_t rnti);
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SRSLTE_API void srslte_pdcch_dci_encode_conv(srslte_pdcch_t *q,
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uint8_t *data,
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uint32_t nof_bits,
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uint8_t *coded_data,
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uint16_t rnti);
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/* Function for generation of UE-specific search space DCI locations */
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SRSLTE_API uint32_t srslte_pdcch_ue_locations(srslte_pdcch_t *q,
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srslte_dci_location_t *locations,
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uint32_t max_locations,
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uint32_t nsubframe,
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uint32_t cfi,
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uint16_t rnti);
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SRSLTE_API uint32_t srslte_pdcch_ue_locations_ncce(uint32_t nof_cce,
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srslte_dci_location_t *c,
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uint32_t max_candidates,
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uint32_t nsubframe, uint16_t rnti);
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/* Function for generation of common search space DCI locations */
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SRSLTE_API uint32_t srslte_pdcch_common_locations(srslte_pdcch_t *q,
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srslte_dci_location_t *locations,
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uint32_t max_locations,
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uint32_t cfi);
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SRSLTE_API uint32_t srslte_pdcch_common_locations_ncce(uint32_t nof_cce,
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srslte_dci_location_t *c,
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uint32_t max_candidates);
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#endif
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