PAM_Demodulator_cplus_impl.h

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/* -*- c++ -*- */
/* gr-owc OOT module for optical wireless communications.
 * gr-owc is compatible with GNU Radio v3.10
 *
 * Copyright 2024 Kunal Sangurmath from Ubiquitous Communications and Networking (UCAN) Lab, University of Massachusetts, Boston.
 *
 * 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_OWC_PAM_DEMODULATOR_CPLUS_IMPL_H
#define INCLUDED_OWC_PAM_DEMODULATOR_CPLUS_IMPL_H
 
#include <gnuradio/owc/PAM_Demodulator_cplus.h>
 
namespace gr {
namespace owc {
 
class PAM_Demodulator_cplus_impl : public PAM_Demodulator_cplus {
private:
  int d_modulation_order;
  float d_max_magnitude;
  float d_min_magnitude;
  int d_samples_per_symbol;
     
  std::vector<int> d_symbol_array;
  std::vector<float> d_level_array;
 
  void set_symbol_array(int modulation_order){
      int num_bits = floor(log2(modulation_order));
      int max_symbol = pow(2,num_bits);
        
      for (int i = 0; i < max_symbol; i++)
      {
        d_symbol_array.push_back(i);
      }
        
  }
  std::vector<int> symbol_array() {return d_symbol_array;}
      
      
  void set_level_array(int modulation_order, float max_magnitude, float min_magnitude){
      d_level_array.clear();
      
      int num_bits = floor(log2(modulation_order));
      int max_symbol = pow(2,num_bits);
      float range = max_magnitude - min_magnitude;
      float single_level_magnitude = range/(modulation_order-1);
      
      float levels = min_magnitude;
              
      for (int i = 0; i < max_symbol; i++)
      {
        d_level_array.push_back(levels);
        levels += single_level_magnitude;
      }
      
  }
  std::vector<float> level_array() {return d_level_array;}
      
  float samples_average_value(std::vector<float> samples_array, int num_incoming_samples){
    float sum = 0;
        
    for (int i = 0; i < num_incoming_samples; i++)
    {
      sum += samples_array[i];
    }
        
    return (sum/num_incoming_samples);
  }
 
public:
  PAM_Demodulator_cplus_impl(int modulation_order, float max_magnitude, float min_magnitude, int samples_per_symbol);
  ~PAM_Demodulator_cplus_impl();
 
  void set_modulation_order(int modulation_order) { d_modulation_order = modulation_order; }
  int modulation_order() { return d_modulation_order; }
 
  void set_max_magnitude(float max_magnitude) { d_max_magnitude = max_magnitude; }
  float max_magnitude() { return d_max_magnitude; }
    
  void set_min_magnitude(float min_magnitude) { d_min_magnitude = min_magnitude; }
  float min_magnitude() { return d_min_magnitude; }
 
  void set_samples_per_symbol(int samples_per_symbol) { d_samples_per_symbol = samples_per_symbol; }
  int samples_per_symbol() { return d_samples_per_symbol; }
 
  // Where all the action really happens
  int work(int noutput_items, gr_vector_const_void_star &input_items,
           gr_vector_void_star &output_items);
};
 
} // namespace owc
} // namespace gr
 
#endif /* INCLUDED_OWC_PAM_DEMODULATOR_CPLUS_IMPL_H */