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112 lines
4.5 KiB
C
112 lines
4.5 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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/*!
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* \file base_graph.h
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* \brief Declaration of the two LDPC base graphs employed in the 5G NR
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* standard.
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* \author David Gregoratti (CTTC)
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* \date 2020
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*
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* This file declares the dimensions of the base graphs and provides an interface
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* for obtaining the set index and the permutation matrix corresponding to a
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* given *lifting size*.
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*
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* \copyright Software Radio Systems Limited
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*
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*/
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#ifndef SRSLTE_BASEGRAPH_H
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#define SRSLTE_BASEGRAPH_H
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#include "srslte/config.h"
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#include <stdint.h>
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#define SRSLTE_LDPC_BG1_MAX_LEN_CB 8448 /*!< \brief Maximum code block size for LDPC BG1 */
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#define SRSLTE_LDPC_BG2_MAX_LEN_CB 3840 /*!< \brief Maximum code block size for LDPC BG2 */
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#define SRSLTE_LDPC_MAX_LEN_CB SRSLTE_MAX(SRSLTE_LDPC_BG1_MAX_LEN_CB, SRSLTE_LDPC_BG2_MAX_LEN_CB)
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#define BG1Nfull 68 /*!< \brief Number of variable nodes in BG1. */
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#define BG1N 66 /*!< \brief Number of variable nodes in BG1 after puncturing. */
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#define BG1M 46 /*!< \brief Number of check nodes in BG1. */
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#define BG1K 22 /*!< \brief Number of "uncoded bits" in BG1. */
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#define BG2Nfull 52 /*!< \brief Number of variable nodes in BG2. */
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#define BG2N 50 /*!< \brief Number of variable nodes in BG2 after puncturing. */
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#define BG2M 42 /*!< \brief Number of check nodes in BG2. */
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#define BG2K 10 /*!< \brief Number of "uncoded bits" in BG2. */
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#define MAX_CNCT 20 /*!< \brief Maximum number (+1) of connected variables per check node. */
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#define NOF_LIFTSIZE 8 /*!< \brief Number of possible lifting size indices. */
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#define MAX_LIFTSIZE 384 /*!< \brief Maximum lifting size. */
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#define VOID_LIFTSIZE 255 /*!< \brief Identifies an invalid lifting size in the lookup table. */
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/*!
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* \brief Identifies a missing connection between a check node and a variable node
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* in the protograph. */
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#define NO_CNCT 0xFFFF
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/*! \brief Possible base graphs, BG1 or BG2. */
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typedef enum SRSLTE_API {
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BG1 = 0, /*!< \brief Base Graph 1 */
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BG2, /*!< \brief Base Graph 2 */
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} srslte_basegraph_t;
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/*!
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* Creates the parity-check matrix for the given base graph and lifting size
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* in the compact form (a normalized permutation matrix). Also returns the
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* indices of the variable nodes associated to each check node.
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* \param[out] pcm The compact parity-check matrix: entry \f$(m,n)\f$ is an
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* integer between 0 and LS-1 if check-node \f$m\f$ is
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* connected to variable node \f$n\f$ in the protograph.
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* This number specifies the order of the circular
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* rotation applied to the identity matrix in the full
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* graph (see also Section 3.4.1 of Deliverable 1). This
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* pointer can be safely cast to 'uint16_t(*)[BGbgNfull]'
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* (see also ::BG1Nfull and ::BG2Nfull) to get an BGbgM x
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* BGbgNfull matrix.
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* \param[out] positions For each check node, the corresponding row of this
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* matrix contains the indices of the connected variable
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* nodes (see also ::BG1_positions and ::BG2_positions).
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* \param[in] bg The desired base graph (BG1 or BG2).
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* \param[in] ls The desired lifting size.
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* \return An integer: 0 if the function executes correctly, -1 otherwise.
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*/
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SRSLTE_API int create_compact_pcm(uint16_t* pcm, int8_t (*positions)[MAX_CNCT], srslte_basegraph_t bg, uint16_t ls);
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/*!
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* Reads the lookup table and returns the set index corresponding to the given
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* lifting size.
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* \param[in] ls A lifting size.
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* \return An integer between 0 and 7 (included), ::VOID_LIFTSIZE if ls is an
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* invalid lifting size
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*/
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static inline uint8_t get_ls_index(uint16_t ls)
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{
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extern const uint8_t LSindex[];
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return (ls <= MAX_LIFTSIZE ? LSindex[ls] : VOID_LIFTSIZE);
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}
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#endif // SRSLTE_BASEGRAPH_H
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