GNU Radio 3.6.4.1 C++ API
channel_model.h
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/* -*- c++ -*- */
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/*
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* Copyright 2009,2012 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef INCLUDED_FILTER_CHANNEL_MODEL_H
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#define INCLUDED_FILTER_CHANNEL_MODEL_H
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#include <
filter/api.h
>
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#include <
gr_hier_block2.h
>
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#include <
gr_types.h
>
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namespace
gr {
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namespace
filter {
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/*!
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* \brief channel simulator
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* \ingroup misc_blk
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*
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* This block implements a basic channel model simulator that can
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* be used to help evaluate, design, and test various signals,
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* waveforms, and algorithms. This model allows the user to set
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* the voltage of an AWGN noise source, a (normalized) frequency
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* offset, a sample timing offset, and a noise seed to randomize
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* the AWGN noise source.
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*
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* Multipath can be approximated in this model by using a FIR
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* filter representation of a multipath delay profile..
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*/
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class
FILTER_API
channel_model
:
virtual
public
gr_hier_block2
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{
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public
:
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// gr::filter::channel_model::sptr
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typedef
boost::shared_ptr<channel_model>
sptr
;
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/*! \brief Build the channel simulator.
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*
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* \param noise_voltage The AWGN noise level as a voltage (to be
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* calculated externally to meet, say, a
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* desired SNR).
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* \param frequency_offset The normalized frequency offset. 0 is
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* no offset; 0.25 would be, for a digital
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* modem, one quarter of the symbol rate.
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* \param epsilon The sample timing offset to emulate the
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* different rates between the sample clocks of
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* the transmitter and receiver. 1.0 is no difference.
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* \param taps Taps of a FIR filter to emulate a multipath delay profile.
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* \param noise_seed A random number generator seed for the noise source.
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*/
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static
sptr
make(
double
noise_voltage=0.0,
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double
frequency_offset=0.0,
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double
epsilon=1.0,
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const
std::vector<gr_complex> &
taps
=std::vector<gr_complex>(1,1),
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double
noise_seed=0);
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virtual
void
set_noise_voltage(
double
noise_voltage) = 0;
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virtual
void
set_frequency_offset(
double
frequency_offset) = 0;
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virtual
void
set_taps(
const
std::vector<gr_complex> &
taps
) = 0;
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virtual
void
set_timing_offset(
double
epsilon) = 0;
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virtual
double
noise_voltage()
const
= 0;
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virtual
double
frequency_offset()
const
= 0;
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virtual
std::vector<gr_complex>
taps
()
const
= 0;
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virtual
double
timing_offset()
const
= 0;
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};
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}
/* namespace filter */
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}
/* namespace gr */
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#endif
/* INCLUDED_FILTER_CHANNEL_MODEL_H */
gr-filter
include
filter
channel_model.h
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