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/*!
* \file
* \brief Channel Code class virtual interface
* \author Tony Ottosson
*
* -------------------------------------------------------------------------
*
* IT++ - C++ library of mathematical, signal processing, speech processing,
* and communications classes and functions
*
* Copyright (C) 1995-2008 (see AUTHORS file for a list of contributors)
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* -------------------------------------------------------------------------
*/
#ifndef CHANNEL_CODE_H
#define CHANNEL_CODE_H
#include <itpp/base/vec.h>
#include <itpp/comm/modulator.h>
namespace itpp {
/*!
\addtogroup fec
*/
//---------------------- BCH --------------------------------------
/*!
\ingroup fec
\brief Generic Channel Code class
*/
class 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 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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