multiuser_chirp_detector_cc_impl.h

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/* -*- c++ -*- */
/*
 * Copyright 2015 Felix Wunsch, Communications Engineering Lab (CEL) / Karlsruhe Institute
 * of Technology (KIT) <wunsch.felix@googlemail.com>.
 *
 * This 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, or (at your option)
 * any later version.
 *
 * This software 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */
 
#ifndef INCLUDED_IEEE802_15_4_MULTIUSER_CHIRP_DETECTOR_CC_IMPL_H
#define INCLUDED_IEEE802_15_4_MULTIUSER_CHIRP_DETECTOR_CC_IMPL_H
 
#include <ieee802_15_4/multiuser_chirp_detector_cc.h>
 
namespace gr {
namespace ieee802_15_4 {
 
class multiuser_chirp_detector_cc_impl : public multiuser_chirp_detector_cc
{
private:
    std::vector<gr_complex> d_chirp_seq;
    int d_time_gap_1;
    int d_time_gap_2;
    int d_len_subchirp;
    float d_threshold;
    static const int STATE_SEARCH = 0;
    static const int STATE_TRACKING = 1;
    static const int NUM_SUBCHIRPS = 4;
    int d_state;
    int d_chirp_ctr;
    int d_subchirp_ctr;
    gr_complex d_e_subchirp; // actually is a float, but needs to be complex for the /
                             // operator to be defined
    void reset();
    gr_complex
    correlate_current_subchirp(const gr_complex* buf); // normalized correlation
    bool corr_over_threshold(gr_complex corrval);
    int dist_to_next_subchirp();
    int required_input_items(); // FIXME: does not take the current position in the chirp
                                // into account
 
public:
#define dout false && std::cout // turn false to true to enable debug output
 
    multiuser_chirp_detector_cc_impl(std::vector<gr_complex> chirp_seq,
                                     int time_gap_1,
                                     int time_gap_2,
                                     int len_subchirp,
                                     float threshold);
    ~multiuser_chirp_detector_cc_impl();
 
    // Where all the action really happens
    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);
};
 
} // namespace ieee802_15_4
} // namespace gr
 
#endif /* INCLUDED_IEEE802_15_4_MULTIUSER_CHIRP_DETECTOR_CC_IMPL_H */