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/*!
* \file
* \brief Definitions of a Hamming code class
* \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 HAMMING_H
#define HAMMING_H
#include <itpp/base/vec.h>
#include <itpp/base/mat.h>
#include <itpp/comm/channel_code.h>
namespace itpp {
/*!
\ingroup fec
\brief Binary Hamming codes
*/
class Hamming_Code : public Channel_Code {
public:
//! Constructor for \c hamming(n,k). n = pow(2,m)-1 and k = pow(2,m)-m-1.
Hamming_Code(short m);
//! Destructor
virtual ~Hamming_Code(){ }
//! Hamming encoder. Will truncate some bits if not \a length = \c integer * \a k.
virtual void encode(const bvec &uncoded_bits, bvec &coded_bits);
//! Hamming encoder. Will truncate some bits if not \a length = \c integer * \a k.
virtual bvec encode(const bvec &uncoded_bits);
//! Hamming decoder. Will truncate some bits if not \a length = \c integer * \a n.
virtual void decode(const bvec &coded_bits, bvec &decoded_bits);
//! Hamming decoder. Will truncate some bits if not \a length = \c integer * \a n.
virtual bvec decode(const bvec &coded_bits);
// Soft-decision decoding is not implemented
virtual void decode(const vec &received_signal, bvec &output);
virtual bvec decode(const vec &received_signal);
//! Get the code rate
virtual double get_rate() const { return static_cast<double>(k) / n; };
//! Gets the code length \a n.
short get_n() const { return n; };
//! Gets the number of information bits per code word, \a k.
short get_k() const { return k; };
//! Gets the parity check matrix for the code.
bmat get_H() const { return H; };
//! Gets the generator matrix for the code.
bmat get_G() const { return G; };
private:
short n, k;
bmat H, G;
void generate_H(void);
void generate_G(void);
};
} // namespace itpp
#endif // #ifndef HAMMING_H
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