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58 lines
2.9 KiB
C++
58 lines
2.9 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2021 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program 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 General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDE_GOLAY2312_H_
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#define INCLUDE_GOLAY2312_H_
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#include "export.h"
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class SDRBASE_API Golay2312
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{
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public:
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Golay2312();
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~Golay2312();
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void encodeParityLast(unsigned int msg, unsigned int *tx);
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void encodeParityFirst(unsigned int msg, unsigned int *tx);
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bool decodeParityLast(unsigned int *rx);
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bool decodeParityFirst(unsigned int *rx);
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private:
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inline int bitAt(int i, unsigned int v) {
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return (v>>i) & 0x01;
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}
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void initG();
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void initH();
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void buildCorrMatrix(unsigned char *corr, unsigned int *H, bool pf = false);
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unsigned int syn(unsigned int *H, unsigned int rx);
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bool lut(unsigned char *corr, unsigned int syndrome, unsigned int *rx);
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unsigned char m_corrPL[2048*3]; //!< up to 3 bit error correction by syndrome index - parity last
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unsigned char m_corrPF[2048*3]; //!< up to 3 bit error correction by syndrome index - parity first
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unsigned int m_GPL[23]; //!< Generator matrix of 23x12 bits - parity first (MSB)
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unsigned int m_GPF[23]; //!< Generator matrix of 23x12 bits - parity last (LSB)
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unsigned int m_HPL[11]; //!< Parity check matrix of 11x23 bits - parity last (LSB)
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unsigned int m_HPF[11]; //!< Parity check matrix of 11x23 bits - parity first (MSB)
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// building arrays
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static const unsigned int m_B[11]; //!< Coding matrix (11x12 bits)
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static const unsigned int m_I12[12]; //!< 12x12 identity matrix (12x12 bits)
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static const unsigned int m_I11[11]; //!< 11x11 identity matrix (11x11 bits)
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};
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#endif // INCLUDE_GOLAY2312_H_
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