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/* -*- c++ -*- */
/*
* Copyright 2015 Free Software Foundation, Inc.
*
* This 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.
*
* This software 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 software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_ldpc_H_matrix_impl_H
#define INCLUDED_ldpc_H_matrix_impl_H
#include "fec_mtrx_impl.h"
#include <gnuradio/fec/ldpc_H_matrix.h>
namespace gr {
namespace fec {
namespace code {
class ldpc_H_matrix_impl : public fec_mtrx_impl, public ldpc_H_matrix
{
private:
// Gap (assumes matrix is in TABECD form)
unsigned int d_gap;
// Submatrices found during preprocessing, used for encoding
gsl_matrix_view d_A_view;
gsl_matrix_view d_B_view;
gsl_matrix_view d_D_view;
gsl_matrix_view d_E_view;
gsl_matrix_view d_T_view;
gsl_matrix* d_phi_inverse_ptr;
//! Sets the submatrix variables needed for encoding
void set_parameters_for_encoding();
void
back_solve_mod2(gsl_matrix* result, const gsl_matrix* U, const gsl_matrix* y) const;
//! Access the A submatrix, needed during encoding
const gsl_matrix* A() const;
//! Access the B submatrix, needed during encoding
const gsl_matrix* B() const;
//! Access the D submatrix, needed during encoding
const gsl_matrix* D() const;
//! Access the E submatrix, needed during encoding
const gsl_matrix* E() const;
//! Access the T submatrix, needed during encoding
const gsl_matrix* T() const;
/*!
* \brief Access the \f$\phi^{-1}\f$ matrix
* \details
* Access the matrix \f$\phi^{-1}\f$, which is needed during
* encoding. \f$\phi\f$ is defined as:
* \f$\phi=C-ET^{-1}A\f$.
*/
const gsl_matrix* phi_inverse() const;
public:
/*!
* \brief Constructor given alist file and gap
* \param filename Name of an alist file to use. The alist
* format is described at:
* http://www.inference.phy.cam.ac.uk/mackay/codes/alist.html
* \param gap A property of the matrix being used. For alist
* files distributed with GNU Radio, this value
* is specified in the alist filename. The gap is
* found during the matrix preprocessing
* algorithm. It is equal to the number of rows in
* submatrices E, C and D.
*/
ldpc_H_matrix_impl(const std::string filename, unsigned int gap);
//! Encode \p inbuffer with LDPC H matrix into \p outbuffer.
void encode(unsigned char* outbuffer, const unsigned char* inbuffer) const;
//! Decode \p inbuffer with LDPC H matrix into \p outbuffer.
void decode(unsigned char* outbuffer,
const float* inbuffer,
unsigned int frame_size,
unsigned int max_iterations) const;
//! Redefine these here as part of the public interface
unsigned int n() const { return fec_mtrx_impl::n(); };
//! Redefine these here as part of the public interface
unsigned int k() const { return fec_mtrx_impl::k(); };
gr::fec::code::fec_mtrx_sptr get_base_sptr();
/*!
* \brief Destructor
* \details
* Calls the gsl_matrix_free function to free memory
*/
virtual ~ldpc_H_matrix_impl();
};
} // namespace code
} // namespace fec
} // namespace gr
#endif /* INCLUDED_ldpc_H_matrix_impl_H */
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