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https://github.com/eried/portapack-mayhem.git
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4aae77f565
Use single set of taps for positive and negative filters. Reverse taps (since new samples are pushed into buffer from the high end). Make complex multiply explicit to avoid fancy but irrelevant arithmetic checks. Compute negative filter from conjugation of positive filter taps. Move filter power and difference calculations into MatchedFilter.
82 lines
2.4 KiB
C++
82 lines
2.4 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 "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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class FSKProcessor : public BasebandProcessor {
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public:
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using payload_t = std::bitset<1024>;
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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 { baseband::ais::rrc_taps_8_p, 1 };
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clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
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static_cast<float>(sampling_rate / 4),
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9600,
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{ 0.0012f },
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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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PacketBuilder packet_builder {
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[this](const PacketBuilder::PayloadType& payload, const size_t bits_received) {
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this->payload_handler(payload, bits_received);
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}
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};
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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 payload_t& payload, const size_t bits_received);
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};
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#endif/*__PROC_FSK_H__*/
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