iridium_qpsk_demod_cpp_impl.h

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/* -*- c++ -*- */
/* 
 * Copyright 2016 Free Software Foundation, Inc
 * 
 * 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_IRIDIUM_TOOLKIT_IRIDIUM_QPSK_DEMOD_CPP_IMPL_H
#define INCLUDED_IRIDIUM_TOOLKIT_IRIDIUM_QPSK_DEMOD_CPP_IMPL_H

#include <iridium/iridium_qpsk_demod_cpp.h>

namespace gr {
  namespace iridium {

    class iridium_qpsk_demod_cpp_impl : public iridium_qpsk_demod_cpp
    {
     private:
      size_t d_max_burst_size;
      float d_alpha;

      float * d_magnitude_f;
      gr_complex * d_burst_after_pll;
      gr_complex * d_decimated_burst;
      int * d_demodulated_burst;
      int d_symbol_mapping[4];
      uint64_t d_n_handled_bursts;
      uint64_t d_n_access_ok_bursts;

      std::vector<uint8_t> d_bits;

      void handler(pmt::pmt_t msg);
      void update_buffer_sizes(size_t burst_size);
      int decimate(const gr_complex * in, int size, int sps, gr_complex * out);
      void qpskFirstOrderPLL(const gr_complex* x, int size, float alpha, gr_complex* y);
      size_t demod_qpsk(const gr_complex *burst, size_t n_symbols, int * out, float * level, int * confidence);
      bool check_sync_word(int * d_demodulated_burst, size_t n_symbols, ::iridium::direction direction);
      void decode_deqpsk(int * demodulated_burst, size_t n_symbols);
      void map_symbols_to_bits(const int * demodulated_burst, size_t n_symbols, std::vector<uint8_t> &bits);
     public:
      iridium_qpsk_demod_cpp_impl();
      ~iridium_qpsk_demod_cpp_impl();

      uint64_t get_n_handled_bursts();
      uint64_t get_n_access_ok_bursts();

      int work(int noutput_items,
         gr_vector_const_void_star &input_items,
         gr_vector_void_star &output_items);
    };

  } // namespace iridium
} // namespace gr

#endif /* INCLUDED_IRIDIUM_TOOLKIT_IRIDIUM_QPSK_DEMOD_CPP_IMPL_H */