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/*!
* \file
* \brief Reed-Solomon encoder/decoder class test program
* \author Steve Peters and Adam Piatyszek
*
* -------------------------------------------------------------------------
*
* 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/>.
*
* -------------------------------------------------------------------------
*/
#include <itpp/itcomm.h>
using namespace itpp;
using std::cout;
using std::endl;
int main()
{
cout << "==========================================" << endl;
cout << " Test of Reed-Solomon encoder/decoder " << endl;
cout << "==========================================" << endl;
bmat u = randb(8, 15);
bmat c(u.rows(), 21);
bmat y(u.rows(), 21);
bvec codeword, errorword;
bmat decoded(u.rows(), u.cols());
Reed_Solomon rs(3, 1);
Reed_Solomon rs_sys(3, 1, true);
bmat f = "1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0; 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1; 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0";
cout << "Non-systematic case" << endl;
cout << "-------------------" << endl;
for (int i = 0; i < u.rows(); i++) {
cout << "Info word: " << u.get_row(i) << endl;
codeword = rs.encode(u.get_row(i));
it_assert(c.cols() == length(codeword), "Error 1");
c.set_row(i, rs.encode(u.get_row(i)));
cout << "Encoded: " << c.get_row(i) << endl;
errorword = f.get_row(i) + c.get_row(i);
it_assert(y.cols() == length(errorword), "Error 2");
y.set_row(i, f.get_row(i) + c.get_row(i));
cout << "One error added: " << y.get_row(i) << endl;
decoded.set_row(i, rs.decode(y.get_row(i)));
cout << "Decoded to: " << decoded.get_row(i) << endl << endl;
}
cout << "Systematic case" << endl;
cout << "---------------" << endl;
for (int i = 0; i < u.rows(); i++) {
c.set_row(i, rs_sys.encode(u.get_row(i)));
cout << "Info word: " << u.get_row(i) << endl;
cout << "Encoded: " << c.get_row(i) << endl;
y.set_row(i, f.get_row(i) + c.get_row(i));
cout << "One error added: " << y.get_row(i) << endl;
decoded.set_row(i, rs_sys.decode(y.get_row(i)));
cout << "Decoded to: " << decoded.get_row(i) << endl << endl;
}
bmat g = "1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0; 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0; 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0; 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1; 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0";
cout << "Systematic case with decoder failure indicator" << endl;
cout << "----------------------------------------------" << endl;
for (int i = 0; i < u.rows(); i++) {
c.set_row(i, rs_sys.encode(u.get_row(i)));
cout << "Info word: " << u.get_row(i) << endl;
cout << "Encoded: " << c.get_row(i) << endl;
y.set_row(i, g.get_row(i) + c.get_row(i));
cout << "Two error added: " << y.get_row(i) << endl;
bvec message, cw_is_valid;
rs_sys.decode(y.get_row(i), message, cw_is_valid);
decoded.set_row(i, message);
cout << "Decoded to: " << decoded.get_row(i) << endl;
cout << "Codeword valid: " << cw_is_valid << endl << endl;
}
rs = Reed_Solomon(3, 1, false, 0);
rs_sys = Reed_Solomon(3, 1, true, 0);
cout << "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" << endl;
cout << "Erasure decoding (1 erasure) and non-narrow-sense" << endl;
cout << "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" << endl;
cout << "Non-systematic case" << endl;
cout << "-------------------" << endl;
for (int i = 0; i < u.rows(); i++) {
cout << "Info word: " << u.get_row(i) << endl;
codeword = rs.encode(u.get_row(i));
it_assert(c.cols() == length(codeword), "Error 1");
c.set_row(i, rs.encode(u.get_row(i)));
cout << "Encoded: " << c.get_row(i) << endl;
it_assert(y.cols() == length(errorword), "Error 2");
y.set_row(i, c.get_row(i));
bvec decoded_tmp;
bvec cw_isvalid;
ivec erasure(1);
erasure(0) = i/y.cols();
rs.decode(y.get_row(i), erasure, decoded_tmp, cw_isvalid);
decoded.set_row(i, decoded_tmp);
cout << "Decoded to: " << decoded.get_row(i) << endl << endl;
}
cout << "Systematic case" << endl;
cout << "---------------" << endl;
for (int i = 0; i < u.rows(); i++) {
c.set_row(i, rs_sys.encode(u.get_row(i)));
cout << "Info word: " << u.get_row(i) << endl;
cout << "Encoded: " << c.get_row(i) << endl;
y.set_row(i, c.get_row(i));
bvec decoded_tmp;
bvec cw_isvalid;
ivec erasure(1);
erasure(0) = 0;//i/y.cols();
rs_sys.decode(y.get_row(i), erasure, decoded_tmp, cw_isvalid);
decoded.set_row(i, decoded_tmp);
cout << "Decoded to: " << decoded.get_row(i) << endl << endl;
}
return 0;
}
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