/*

 * Copyright 2009 Free Software Foundation, Inc.

 * 

 * This file is part of GNU Radio

 * 

 * GNU Radio 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.

 * 

 * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street,

 * Boston, MA 02110-1301, USA.

 */

#include <gr_top_block.h>

#include <gr_fractional_interpolator_cc.h>

#include <gr_sig_source_c.h>

#include <gr_fir_filter_ccc.h>

#include <gr_add_cc.h>

#include <gr_noise_source_c.h>

#include <gr_multiply_cc.h>

class gr_channel_model;

typedef boost::shared_ptr<gr_channel_model> gr_channel_model_sptr;

gr_channel_model_sptr gr_make_channel_model(double noise_voltage=0.0,

                                            double frequency_offset=0.0,

                                            double epsilon=1.0,

                                            const std::vector<gr_complex> &taps=std::vector<gr_complex>(1, 1),

                                            double noise_seed=3021);

/*!

 * \brief channel simulator

 * \ingroup misc_blk

 */

class gr_channel_model : public gr_hier_block2

{

 private:

  gr_channel_model(double noise_voltage,

                   double frequency_offset,

                   double epsilon,

                   const std::vector<gr_complex> &taps,

                   double noise_seed);

  friend gr_channel_model_sptr gr_make_channel_model(double noise_voltage,

                                                     double frequency_offset,

                                                     double epsilon,

                                                     const std::vector<gr_complex> &taps,

                                                     double noise_seed);

  gr_fractional_interpolator_cc_sptr d_timing_offset;

  gr_sig_source_c_sptr d_freq_offset;

  gr_fir_filter_ccc_sptr d_multipath;

  gr_add_cc_sptr d_noise_adder;

  gr_noise_source_c_sptr d_noise;

  gr_multiply_cc_sptr d_mixer_offset;

  std::vector<gr_complex> d_taps;

 public:

  void set_noise_voltage(double noise_voltage);

  void set_frequency_offset(double frequency_offset);

  void set_taps(const std::vector<gr_complex> &taps);

  void set_timing_offset(double epsilon);

};