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   1 /*
   2  * Copyright 2009 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GNU Radio
   5  *
   6  * GNU Radio is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3, or (at your option)
   9  * any later version.
  10  *
  11  * GNU Radio is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GNU Radio; see the file COPYING.  If not, write to
  18  * the Free Software Foundation, Inc., 51 Franklin Street,
  19  * Boston, MA 02110-1301, USA.
  20  */
  21
  22 #include <gr_top_block.h>
  23 #include <gr_fractional_interpolator_cc.h>
  24 #include <gr_sig_source_c.h>
  25 #include <gr_fir_filter_ccc.h>
  26 #include <gr_add_cc.h>
  27 #include <gr_noise_source_c.h>
  28 #include <gr_multiply_cc.h>
  29
  30 class gr_channel_model;
  31 typedef boost::shared_ptr<gr_channel_model> gr_channel_model_sptr;
  32
  33
  34 gr_channel_model_sptr gr_make_channel_model(double noise_voltage=0.0,
  35                                             double frequency_offset=0.0,
  36                                             double epsilon=1.0,
  37                                             const std::vector<gr_complex> &taps=std::vector<gr_complex>(1, 1),
  38                                             double noise_seed=3021);
  39
  40 /*!
  41  * \brief channel simulator
  42  * \ingroup misc_blk
  43  */
  44 class gr_channel_model : public gr_hier_block2
  45 {
  46  private:
  47   gr_channel_model(double noise_voltage,
  48                    double frequency_offset,
  49                    double epsilon,
  50                    const std::vector<gr_complex> &taps,
  51                    double noise_seed);
  52
  53   friend gr_channel_model_sptr gr_make_channel_model(double noise_voltage,
  54                                                      double frequency_offset,
  55                                                      double epsilon,
  56                                                      const std::vector<gr_complex> &taps,
  57                                                      double noise_seed);
  58
  59   gr_fractional_interpolator_cc_sptr d_timing_offset;
  60   gr_sig_source_c_sptr d_freq_offset;
  61   gr_fir_filter_ccc_sptr d_multipath;
  62   gr_add_cc_sptr d_noise_adder;
  63   gr_noise_source_c_sptr d_noise;
  64   gr_multiply_cc_sptr d_mixer_offset;
  65
  66   std::vector<gr_complex> d_taps;
  67
  68  public:
  69   void set_noise_voltage(double noise_voltage);
  70   void set_frequency_offset(double frequency_offset);
  71   void set_taps(const std::vector<gr_complex> &taps);
  72   void set_timing_offset(double epsilon);
  73 };