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/* -*- c++ -*- */
/*
* Copyright 2009,2012 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 "channel_model_impl.h"
#include <gr_io_signature.h>
#include <iostream>
namespace gr {
namespace channels {
channel_model::sptr
channel_model::make(double noise_voltage,
double frequency_offset,
double epsilon,
const std::vector<gr_complex> &taps,
double noise_seed)
{
return gnuradio::get_initial_sptr
(new channel_model_impl(noise_voltage,
frequency_offset,
epsilon,
taps,
noise_seed));
}
// Hierarchical block constructor
channel_model_impl::channel_model_impl(double noise_voltage,
double frequency_offset,
double epsilon,
const std::vector<gr_complex> &taps,
double noise_seed)
: gr_hier_block2("channel_model",
gr_make_io_signature(1, 1, sizeof(gr_complex)),
gr_make_io_signature(1, 1, sizeof(gr_complex)))
{
d_taps = taps;
while(d_taps.size() < 2) {
d_taps.push_back(0);
}
d_timing_offset = filter::fractional_interpolator_cc::make(0, epsilon);
d_multipath = filter::fir_filter_ccc::make(1, d_taps);
d_noise_adder = blocks::add_cc::make();
d_noise = analog::noise_source_c::make(analog::GR_GAUSSIAN,
noise_voltage, noise_seed);
d_freq_offset = analog::sig_source_c::make(1, analog::GR_SIN_WAVE,
frequency_offset, 1.0, 0.0);
d_mixer_offset = blocks::multiply_cc::make();
connect(self(), 0, d_timing_offset, 0);
connect(d_timing_offset, 0, d_multipath, 0);
connect(d_multipath, 0, d_mixer_offset, 0);
connect(d_freq_offset, 0, d_mixer_offset, 1);
connect(d_mixer_offset, 0, d_noise_adder, 1);
connect(d_noise, 0, d_noise_adder, 0);
connect(d_noise_adder, 0, self(), 0);
}
channel_model_impl::~channel_model_impl()
{
}
void
channel_model_impl::set_noise_voltage(double noise_voltage)
{
d_noise->set_amplitude(noise_voltage);
}
void
channel_model_impl::set_frequency_offset(double frequency_offset)
{
d_freq_offset->set_frequency(frequency_offset);
}
void
channel_model_impl::set_taps(const std::vector<gr_complex> &taps)
{
d_taps = taps;
while(d_taps.size() < 2) {
d_taps.push_back(0);
}
d_multipath->set_taps(d_taps);
}
void
channel_model_impl::set_timing_offset(double epsilon)
{
d_timing_offset->set_interp_ratio(epsilon);
}
double
channel_model_impl::noise_voltage() const
{
return d_noise->amplitude();
}
double
channel_model_impl::frequency_offset() const
{
return d_freq_offset->frequency();
}
std::vector<gr_complex>
channel_model_impl::taps() const
{
return d_multipath->taps();
}
double
channel_model_impl::timing_offset() const
{
return d_timing_offset->interp_ratio();
}
} /* namespace channels */
} /* namespace gr */
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