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/*!
* \file
* \brief Channel Code class virtual interface
* \author Tony Ottosson
*
* -------------------------------------------------------------------------
*
* Copyright (C) 1995-2010 (see AUTHORS file for a list of contributors)
*
* This file is part of IT++ - a C++ library of mathematical, signal
* processing, speech processing, and communications classes and functions.
*
* IT++ 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 of the License, or (at your option) any
* later version.
*
* IT++ 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 IT++. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#ifndef CHANNEL_CODE_H
#define CHANNEL_CODE_H
#include <itpp/base/vec.h>
#include <itpp/comm/modulator.h>
#include <itpp/itexports.h>
namespace itpp
{
/*!
\addtogroup fec
*/
//---------------------- BCH --------------------------------------
/*!
\ingroup fec
\brief Generic Channel Code class
*/
class ITPP_EXPORT Channel_Code
{
public:
//! Default constructor
Channel_Code() {}
//! Destructor
virtual ~Channel_Code() {}
//! Encode a bvec of input
virtual void encode(const bvec &uncoded_bits, bvec &coded_bits) = 0;
//! Encode a bvec of input
virtual bvec encode(const bvec &uncoded_bits) = 0;
//! Decode a bvec of coded data.
virtual void decode(const bvec &codedbits, bvec &decoded_bits) = 0;
//! Decode a bvec of coded data
//virtual bvec decode(const bvec &coded_bits);
virtual bvec decode(const bvec &coded_bits) = 0;
//! Decode a vec of received data.
virtual void decode(const vec &received_signal, bvec &decoded_bits) = 0;
//! Decode a vec of received data
//virtual bvec decode(const vec &received_signal);
virtual bvec decode(const vec &received_signal) = 0;
//! Get the code rate
virtual double get_rate() const = 0;
};
/*!
\ingroup fec
\brief Dummy Channel Code class
A dummy code class. Uncoded output.
*/
class ITPP_EXPORT Dummy_Code : public Channel_Code
{
public:
//! Default constructor
Dummy_Code() {}
//! Destructor
virtual ~Dummy_Code() {}
//! Encode a bvec of input
virtual void encode(const bvec &uncoded_bits, bvec &coded_bits) { coded_bits = uncoded_bits; }
//! Encode a bvec of input
virtual bvec encode(const bvec &uncoded_bits) { return uncoded_bits; }
//! Decode a bvec of coded data.
virtual void decode(const bvec &coded_bits, bvec &decoded_bits) { decoded_bits = coded_bits; }
//! Decode a bvec of coded data.
virtual bvec decode(const bvec &coded_bits) { return coded_bits; }
//! Decode a vec of received data. Assumes soft input (BPSK modulated)
virtual void decode(const vec &received_signal, bvec &decoded_bits) { BPSK bpsk; bpsk.demodulate_bits(received_signal, decoded_bits); }
//! Decode a vec of received data. Assumes soft input (BPSK modulated)
virtual bvec decode(const vec &received_signal) { bvec out; decode(received_signal, out); return out; }
//! Get the code rate
virtual double get_rate() const { return 1.0; }
};
} // namespace itpp
#endif // #ifndef CHANNEL_CODE_H
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