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/* -*- c++ -*- */
/*
* Copyright 2020 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_DIGITAL_DECISION_FEEDBACK_EQUALIZER_IMPL_H
#define INCLUDED_DIGITAL_DECISION_FEEDBACK_EQUALIZER_IMPL_H
#include "equalizer.h"
#include <gnuradio/digital/decision_feedback_equalizer.h>
#include <gnuradio/filter/fir_filter.h>
#include <volk/volk_alloc.hh>
#include <deque>
namespace gr {
namespace digital {
class decision_feedback_equalizer_impl : public decision_feedback_equalizer,
filter::kernel::fir_filter_ccc
{
private:
const unsigned d_num_taps_fwd;
const unsigned d_num_taps_rev;
const unsigned d_sps;
adaptive_algorithm_sptr d_alg;
const bool d_adapt_after_training;
const std::vector<gr_complex> d_training_sequence;
const pmt::pmt_t d_training_start_tag;
const unsigned d_num_taps;
std::deque<gr_complex> d_decision_history;
std::vector<gr_complex> d_new_taps;
bool d_updated;
gr_complex d_error;
equalizer_state_t d_training_state;
unsigned int d_training_sample;
volk::vector<gr_complex> d_filt_buf;
mutable gr::thread::mutex d_mutex;
public:
decision_feedback_equalizer_impl(unsigned num_taps_forward,
unsigned num_taps_feedback,
unsigned sps,
adaptive_algorithm_sptr alg,
bool adapt_after_training,
std::vector<gr_complex> training_sequence,
const std::string& training_start_tag);
~decision_feedback_equalizer_impl() {}
void update_decision_history(gr_complex decision);
void set_taps(const std::vector<gr_complex>& taps);
std::vector<gr_complex> taps() const;
int work(int noutput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items) override;
// Same as the work function, but more specific and decoupled from the
// scheduler-related actions
int equalize(const gr_complex* input_samples,
gr_complex* output_symbols,
unsigned int num_inputs,
unsigned int max_num_outputs,
std::vector<unsigned int> training_start_samples,
bool history_included,
gr_complex* taps,
unsigned short* state);
};
} // namespace digital
} // namespace gr
#endif /* INCLUDED_DIGITAL_DECISION_FEEDBACK_EQUALIZER_IMPL_H */
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