frame_equalizer_impl.h

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/*
 * Copyright (C) 2016 Bastian Bloessl <bloessl@ccs-labs.org>
 *
 * 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef INCLUDED_IEEE802_11_FRAME_EQUALIZER_IMPL_H
#define INCLUDED_IEEE802_11_FRAME_EQUALIZER_IMPL_H
 
#include "equalizer/base.h"
#include "viterbi_decoder/viterbi_decoder.h"
#include <ieee802_11/constellations.h>
#include <ieee802_11/frame_equalizer.h>
 
namespace gr {
namespace ieee802_11 {
 
class frame_equalizer_impl : virtual public frame_equalizer
{
 
public:
    frame_equalizer_impl(Equalizer algo, double freq, double bw, bool log, bool debug);
    ~frame_equalizer_impl();
 
    void set_algorithm(Equalizer algo);
    void set_bandwidth(double bw);
    void set_frequency(double freq);
 
    void forecast(int noutput_items, gr_vector_int& ninput_items_required);
    int general_work(int noutput_items,
                     gr_vector_int& ninput_items,
                     gr_vector_const_void_star& input_items,
                     gr_vector_void_star& output_items);
 
private:
    bool parse_signal(uint8_t* signal);
    bool decode_signal_field(uint8_t* rx_bits);
    void deinterleave(uint8_t* rx_bits);
 
    equalizer::base* d_equalizer;
    gr::thread::mutex d_mutex;
    std::vector<gr::tag_t> tags;
    bool d_debug;
    bool d_log;
    int d_current_symbol;
    viterbi_decoder d_decoder;
 
    // freq offset
    double d_freq;                      // Hz
    double d_freq_offset_from_synclong; // Hz, estimation from "sync_long" block
    double d_bw;                        // Hz
    double d_er;
    double d_epsilon0;
    gr_complex d_prev_pilots[4];
 
    int d_frame_bytes;
    int d_frame_symbols;
    int d_frame_encoding;
 
    uint8_t d_deinterleaved[48];
    gr_complex symbols[48];
 
    std::shared_ptr<gr::digital::constellation> d_frame_mod;
    constellation_bpsk::sptr d_bpsk;
    constellation_qpsk::sptr d_qpsk;
    constellation_16qam::sptr d_16qam;
    constellation_64qam::sptr d_64qam;
 
    static const int interleaver_pattern[48];
};
 
} // namespace ieee802_11
} // namespace gr
 
#endif /* INCLUDED_IEEE802_11_FRAME_EQUALIZER_IMPL_H */