mirror of
https://github.com/hb9fxq/gr-digitalhf
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146 lines
4.1 KiB
C++
146 lines
4.1 KiB
C++
/* -*- c++ -*- */
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/*
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* Copyright 2018 hcab14@mail.com.
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*
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* This 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, or (at your option)
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* any later version.
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*
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* This software 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 software; 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 INCLUDED_DIGITALHF_ADAPTIVE_DFE_IMPL_H
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#define INCLUDED_DIGITALHF_ADAPTIVE_DFE_IMPL_H
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#include <gnuradio/blocks/control_loop.h>
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#include <gnuradio/blocks/rotator.h>
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#include <gnuradio/digital/constellation.h>
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#include <digitalhf/adaptive_dfe.h>
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#include "filter_update.hpp"
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#include "volk_alloc.h"
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namespace gr {
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namespace digitalhf {
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class constellation_distance_filter {
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public:
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constellation_distance_filter(int max_time_constant=10)
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: _max_time_constant(max_time_constant)
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, _counter(0)
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, _pwr(0) {}
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void reset(int max_time_constant) {
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_max_time_constant = max_time_constant;
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_counter = 0;
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_pwr = 0;
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}
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float filter(float x) {
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_counter += (_counter < _max_time_constant);
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float const alpha = 1.0f/_counter;
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_pwr = (1-alpha)*_pwr + alpha*x;
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return _pwr;
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}
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protected:
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private:
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int _max_time_constant;
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int _counter;
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float _pwr; // filtered distance to constellation point
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} ;
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class adaptive_dfe_impl : public adaptive_dfe {
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private:
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typedef volk::vector<gr_complex> gr_complex_vec_type;
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int _sps;
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int _nB, _nF, _nW;
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int _nGuard;
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float _mu;
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float _alpha;
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bool _use_symbol_taps;
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gr_complex_vec_type _tmp;
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gr_complex_vec_type _taps_samples;
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gr_complex_vec_type _taps_symbols;
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gr_complex_vec_type _last_taps_samples;
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gr_complex_vec_type _hist_symbols;
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int _hist_symbol_index;
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std::vector<gr::digital::constellation_sptr> _constellations;
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std::vector<constellation_distance_filter> _npwr;
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int _npwr_max_time_constant;
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int _constellation_index;
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std::vector<gr_complex> _symbols;
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std::vector<gr_complex> _scramble; // PSK-8 scramble symbols
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std::vector<std::array<int,8> > _scramble_xor; // signs for XOR scrambling
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std::vector<gr_complex> _descrambled_symbols;
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int _symbol_counter;
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bool _save_soft_decisions;
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std::vector<float> _vec_soft_decisions;
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std::map<std::string, pmt::pmt_t> _msg_ports;
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pmt::pmt_t _msg_metadata;
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int _num_samples_since_filter_update;
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gr_complex_vec_type _rotated_samples;
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blocks::rotator _rotator;
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gr::blocks::control_loop _control_loop;
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enum state {
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WAIT_FOR_PREAMBLE,
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WAIT_FOR_FRAME_INFO,
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DO_FILTER
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} _state;
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filter_update::sptr _filter_update;
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void update_constellations(pmt::pmt_t );
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void update_frame_info(pmt::pmt_t );
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gr_complex filter(gr_complex const* start, gr_complex const* end);
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int recenter_filter_taps();
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void reset_filter();
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void publish_frame_info();
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void publish_soft_dec();
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public:
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adaptive_dfe_impl(int sps, // samples per symbol
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int nB, // number of forward FIR taps
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int nF, // number of backward FIR taps
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int nW, // number of symbol taps
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float mu,
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float alpha);
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virtual ~adaptive_dfe_impl();
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void forecast (int noutput_items, gr_vector_int &ninput_items_required);
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virtual bool start();
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virtual bool stop();
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virtual int general_work(int noutput_items,
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gr_vector_int &ninput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items);
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virtual void set_mu(float mu) { _mu = mu; _filter_update->set_parameters({{"mu", mu}}); }
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virtual void set_alpha(float alpha) { _alpha = alpha; }
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} ;
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} // namespace digitalhf
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} // namespace gr
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#endif /* INCLUDED_DIGITALHF_ADAPTIVE_DFE_IMPL_H */
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