/* * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc. * * This file is part of PortaPack. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; see the file COPYING. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, * Boston, MA 02110-1301, USA. */ #ifndef __PROC_FSK_H__ #define __PROC_FSK_H__ #include "baseband_processor.hpp" #include "channel_decimator.hpp" #include "dsp_decimate.hpp" #include "matched_filter.hpp" #include "dsp_fir_taps.hpp" #include "clock_recovery.hpp" #include "symbol_coding.hpp" #include "access_code_correlator.hpp" #include "packet_builder.hpp" #include "message.hpp" #include #include #include constexpr std::array, 8> ais_taps_n { { { 0.00533687f, 0.00000000f }, { -0.00667109f, -0.00667109f }, { -0.00000000f, -0.01334218f }, { -0.05145006f, 0.05145006f }, { -0.14292666f, 0.00000000f }, { -0.05145006f, -0.05145006f }, { 0.00000000f, 0.01334218f }, { -0.00667109f, 0.00667109f }, } }; constexpr std::array, 8> ais_taps_p { { { 0.00533687f, 0.00000000f }, { -0.00667109f, 0.00667109f }, { -0.00000000f, 0.01334218f }, { -0.05145006f, -0.05145006f }, { -0.14292666f, -0.00000000f }, { -0.05145006f, 0.05145006f }, { 0.00000000f, -0.01334218f }, { -0.00667109f, -0.00667109f }, } }; class FSKProcessor : public BasebandProcessor { public: FSKProcessor(MessageHandlerMap& message_handlers); ~FSKProcessor(); void configure(const FSKConfiguration new_configuration); void execute(buffer_c8_t buffer) override; private: const size_t sampling_rate = 76800; ChannelDecimator decimator { ChannelDecimator::DecimationFactor::By16 }; const fir_taps_real<64>& channel_filter_taps = taps_64_lp_031_070_tfilter; dsp::decimate::FIRAndDecimateBy2Complex<64> channel_filter { channel_filter_taps.taps }; dsp::matched_filter::MatchedFilter mf_0 { ais_taps_n, 1 }; dsp::matched_filter::MatchedFilter mf_1 { ais_taps_p, 1 }; clock_recovery::ClockRecovery clock_recovery { sampling_rate / 4, 9600, [this](const float symbol) { this->consume_symbol(symbol); } }; symbol_coding::NRZIDecoder nrzi_decode; AccessCodeCorrelator access_code_correlator; PacketBuilder packet_builder; MessageHandlerMap& message_handlers; void consume_symbol(const float symbol); void payload_handler(const std::bitset<256>& payload, const size_t bits_received); }; #endif/*__PROC_FSK_H__*/