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/*!
* \file
* \brief Recursive systematic convolutional codes class test program
* \author Pal Frenger
*
* -------------------------------------------------------------------------
*
* 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
*
* -------------------------------------------------------------------------
*/
#include <itpp/itbase.h>
#include <itpp/itcomm.h>
using namespace itpp;
using namespace std;
int main()
{
bvec uncoded_bits = "0 1 1 0 1 0 1", tail_bits(4), decoded_bits(11);
bmat parity_bits(11,1);
vec received_systematic(11), extrinsic_output(11), L(11), symbols;
mat received_parity(11,1);
double Ec = 1.0, N0 = 0.00000000000000000000000000000000000000001, Lc = 4.0*sqrt(Ec)/N0;
Normal_RNG noise(0.0,N0/2.0);
BPSK bpsk;
Rec_Syst_Conv_Code rscc;
// Fixed by ediap: ivec("string") constructor uses only decimal notation
// rscc.set_generator_polynomials("031 027",5);
rscc.set_generator_polynomials("25 23", 5);
rscc.set_awgn_channel_parameters(Ec, N0);
rscc.encode_tail(uncoded_bits,tail_bits,parity_bits);
bpsk.modulate_bits( concat(uncoded_bits, tail_bits), symbols );
received_systematic = symbols + noise(11);
bpsk.modulate_bits(parity_bits.get_col(0), symbols);
received_parity.set_col(0, symbols + noise(11));
vec extrinsic_input = zeros(11);
rscc.map_decode(received_systematic, received_parity, extrinsic_input,
extrinsic_output);
L = Lc*received_systematic + extrinsic_output;
for (int k=0; k<11; k++) {
(L(k)>0) ? (decoded_bits(k) = bin(0)) : (decoded_bits(k) = bin(1));
}
cout << "uncoded_bits = " << uncoded_bits << endl;
cout << "tail_bits = " << tail_bits << endl;
cout << "decoded_bits = " << decoded_bits << endl;
return 0;
}
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