mirror of
https://github.com/eried/portapack-mayhem.git
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0bc8f551de
Less than optimal for plain FSK, but flexible enough to also support GFSK/GMSK. Not at all optimized for SIMD instructions, so may not perform adequately at Bluetooth/GSM rates.
98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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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 2, or (at your option)
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* 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; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __PROC_FSK_H__
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#define __PROC_FSK_H__
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#include "baseband_processor.hpp"
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#include "channel_decimator.hpp"
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#include "dsp_decimate.hpp"
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#include "matched_filter.hpp"
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#include "dsp_fir_taps.hpp"
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#include "clock_recovery.hpp"
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#include "symbol_coding.hpp"
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#include "access_code_correlator.hpp"
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#include "packet_builder.hpp"
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#include "message.hpp"
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#include <cstdint>
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#include <cstddef>
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#include <bitset>
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constexpr std::array<std::complex<float>, 8> ais_taps_n { {
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{ 0.00533687f, 0.00000000f }, { -0.00667109f, -0.00667109f },
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{ -0.00000000f, -0.01334218f }, { -0.05145006f, 0.05145006f },
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{ -0.14292666f, 0.00000000f }, { -0.05145006f, -0.05145006f },
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{ 0.00000000f, 0.01334218f }, { -0.00667109f, 0.00667109f },
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} };
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constexpr std::array<std::complex<float>, 8> ais_taps_p { {
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{ 0.00533687f, 0.00000000f }, { -0.00667109f, 0.00667109f },
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{ -0.00000000f, 0.01334218f }, { -0.05145006f, -0.05145006f },
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{ -0.14292666f, -0.00000000f }, { -0.05145006f, 0.05145006f },
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{ 0.00000000f, -0.01334218f }, { -0.00667109f, -0.00667109f },
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} };
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class FSKProcessor : public BasebandProcessor {
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public:
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FSKProcessor(MessageHandlerMap& message_handlers);
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~FSKProcessor();
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void configure(const FSKConfiguration new_configuration);
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void execute(buffer_c8_t buffer) override;
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private:
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const size_t sampling_rate = 76800;
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ChannelDecimator decimator { ChannelDecimator::DecimationFactor::By16 };
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const fir_taps_real<64>& channel_filter_taps = taps_64_lp_031_070_tfilter;
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dsp::decimate::FIRAndDecimateBy2Complex<64> channel_filter { channel_filter_taps.taps };
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dsp::matched_filter::MatchedFilter mf_0 {
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ais_taps_n,
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1
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};
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dsp::matched_filter::MatchedFilter mf_1 {
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ais_taps_p,
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1
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};
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clock_recovery::ClockRecovery clock_recovery {
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sampling_rate / 4,
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9600,
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[this](const float symbol) { this->consume_symbol(symbol); }
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};
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symbol_coding::NRZIDecoder nrzi_decode;
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AccessCodeCorrelator access_code_correlator;
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PacketBuilder packet_builder;
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MessageHandlerMap& message_handlers;
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void consume_symbol(const float symbol);
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void payload_handler(const std::bitset<256>& payload, const size_t bits_received);
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};
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#endif/*__PROC_FSK_H__*/
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