kopia lustrzana https://github.com/OpenRTX/OpenRTX
90 wiersze
3.1 KiB
C++
90 wiersze
3.1 KiB
C++
/***************************************************************************
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* Copyright (C) 2021 - 2023 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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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; either 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 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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#include <cstdio>
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#include <cstdint>
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#include <random>
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#include <array>
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#include "M17/M17ConvolutionalEncoder.hpp"
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#include "M17/M17CodePuncturing.hpp"
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#include "M17/M17Viterbi.hpp"
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#include "M17/M17Utils.hpp"
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using namespace std;
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default_random_engine rng;
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/**
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* Insert radom bit flips in input data.
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*/
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template < size_t N >
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void generateErrors(array< uint8_t, N >& data)
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{
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uniform_int_distribution< uint8_t > numErrs(0, 4);
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uniform_int_distribution< uint8_t > errPos(0, N);
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for(uint8_t i = 0; i < numErrs(rng); i++)
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{
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uint8_t pos = errPos(rng);
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bool bit = M17::getBit(data, pos);
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M17::setBit(data, pos, !bit);
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}
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}
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int main()
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{
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uniform_int_distribution< uint8_t > rndValue(0, 255);
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array< uint8_t, 18 > source;
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for(auto& byte : source)
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{
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byte = rndValue(rng);
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}
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array<uint8_t, 37> encoded;
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M17::M17ConvolutionalEncoder encoder;
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encoder.reset();
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encoder.encode(source.data(), encoded.data(), source.size());
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encoded[36] = encoder.flush();
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array<uint8_t, 34> punctured;
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M17::puncture(encoded, punctured, M17::DATA_PUNCTURE);
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generateErrors(punctured);
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array< uint8_t, 18 > result;
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M17::M17HardViterbi decoder;
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decoder.decodePunctured(punctured, result, M17::DATA_PUNCTURE);
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for(size_t i = 0; i < result.size(); i++)
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{
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if(source[i] != result[i])
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{
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printf("Error at pos %ld: got %02x, expected %02x\n", i, result[i],
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source[i]);
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return -1;
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}
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}
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return 0;
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}
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