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86 lines
2.5 KiB
C++
86 lines
2.5 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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/*
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LDPC SISO encoder
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Copyright 2018 Ahmet Inan <xdsopl@gmail.com>
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*/
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#ifndef ENCODER_HH
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#define ENCODER_HH
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#include "ldpc.h"
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namespace ldpctool {
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template <typename TYPE>
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class LDPCEncoder
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{
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LDPCInterface *ldpc;
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int N, K, R;
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bool initialized;
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TYPE one()
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{
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return 1;
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}
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TYPE sign(TYPE a, TYPE b)
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{
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return b < TYPE(0) ? -a : b > TYPE(0) ? a : TYPE(0);
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}
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public:
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LDPCEncoder() : initialized(false)
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{
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}
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void init(LDPCInterface *it)
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{
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if (initialized)
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delete ldpc;
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initialized = true;
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ldpc = it->clone();
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N = ldpc->code_len();
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K = ldpc->data_len();
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R = N - K;
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}
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void operator()(TYPE *data, TYPE *parity)
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{
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for (int i = 0; i < R; ++i)
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parity[i] = one();
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ldpc->first_bit();
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for (int j = 0; j < K; ++j) {
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int *acc_pos = ldpc->acc_pos();
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int bit_deg = ldpc->bit_deg();
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for (int n = 0; n < bit_deg; ++n) {
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int i = acc_pos[n];
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parity[i] = sign(parity[i], data[j]);
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}
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ldpc->next_bit();
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}
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for (int i = 1; i < R; ++i)
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parity[i] = sign(parity[i], parity[i-1]);
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}
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~LDPCEncoder()
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{
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if (initialized)
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delete ldpc;
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}
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};
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} // namespace ldpctool
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#endif
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