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/*!
* \file
* \brief 1D and 2D modulators test program
* \author Tony Ottosson and Adam Piatyszek
*
* -------------------------------------------------------------------------
*
* 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/itcomm.h>
using namespace itpp;
using namespace std;
int main()
{
RNG_reset(12345);
cout << "===========================================================" << endl;
cout << " Test of Modulators " << endl;
cout << "===========================================================" << endl;
const int no_symbols = 5;
const double N0 = 0.1;
{
cout << endl << "Modulator_1D (configured as BPSK)" << endl;
Modulator_1D mod("1.0 -1.0", "0 1");
int bps = round_i(mod.bits_per_symbol());
bvec tx_bits = randb(no_symbols * bps);
ivec tx_sym_numbers = randi(no_symbols, 0, pow2i(bps) - 1);
vec noise = sqrt(N0) * randn(no_symbols);
vec tx_symbols = mod.modulate_bits(tx_bits);
vec rx_symbols = tx_symbols + noise;
bvec decbits = mod.demodulate_bits(rx_symbols);
cout << "* modulating bits:" << endl;
cout << " tx_bits = " << tx_bits << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " decbits = " << decbits << endl;
tx_symbols = mod.modulate(tx_sym_numbers);
rx_symbols = tx_symbols + noise;
ivec dec_sym_numbers = mod.demodulate(rx_symbols);
cout << "* modulating symbol numbers:" << endl;
cout << " tx_sym_numbers = " << tx_sym_numbers << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " dec_sym_numbers = " << dec_sym_numbers << endl;
cout << endl << "BPSK (real signal)" << endl;
BPSK bpsk;
bpsk.modulate_bits(tx_bits, tx_symbols);
rx_symbols = tx_symbols + noise;
bpsk.demodulate_bits(rx_symbols, decbits);
cout << "* modulating bits:" << endl;
cout << " tx_bits = " << tx_bits << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " decbits = " << decbits << endl;
cout << endl << "BPSK (complex signal)" << endl;
BPSK_c bpsk_c;
cvec tx_csymbols = bpsk_c.modulate_bits(tx_bits);
cvec rx_csymbols = tx_csymbols + to_cvec(noise, -noise);
decbits = bpsk_c.demodulate_bits(rx_csymbols);
vec softbits_approx = bpsk_c.demodulate_soft_bits(rx_csymbols, N0, APPROX);
vec softbits = bpsk_c.demodulate_soft_bits(rx_csymbols, N0, LOGMAP);
cout << "* modulating bits:" << endl;
cout << " tx_bits = " << tx_bits << endl;
cout << " tx_csymbols = " << tx_csymbols << endl;
cout << " rx_csymbols = " << rx_csymbols << endl;
cout << " decbits = " << decbits << endl;
cout << " softbits = " << softbits << endl;
cout << " softbits_approx = " << softbits_approx << endl << endl;
}
cout << "===========================================================" << endl;
{
cout << endl << "Modulator_1D (configured as 4-PAM)" << endl;
Modulator_1D mod("-3.0 -1.0 1.0 3.0", "0 1 3 2");
int bps = round_i(mod.bits_per_symbol());
bvec tx_bits = randb(no_symbols * bps);
ivec tx_sym_numbers = randi(no_symbols, 0, pow2i(bps) - 1);
vec noise = sqrt(N0) * randn(no_symbols);
vec tx_symbols = mod.modulate_bits(tx_bits);
vec rx_symbols = tx_symbols + noise;
bvec decbits = mod.demodulate_bits(rx_symbols);
cout << "* modulating bits:" << endl;
cout << " tx_bits = " << tx_bits << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " decbits = " << decbits << endl;
tx_symbols = mod.modulate(tx_sym_numbers);
rx_symbols = tx_symbols + noise;
ivec dec_sym_numbers = mod.demodulate(rx_symbols);
cout << "* modulating symbol numbers:" << endl;
cout << " tx_sym_numbers = " << tx_sym_numbers << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " dec_sym_numbers = " << dec_sym_numbers << endl;
cout << endl << "4-PAM (real signal)" << endl;
PAM pam(4);
pam.modulate_bits(tx_bits, tx_symbols);
rx_symbols = tx_symbols + noise;
pam.demodulate_bits(rx_symbols, decbits);
cout << "* modulating bits:" << endl;
cout << " tx_bits = " << tx_bits << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " decbits = " << decbits << endl;
cout << endl << "4-PAM (complex signal)" << endl;
PAM_c pam_c(4);
cvec tx_csymbols = pam_c.modulate_bits(tx_bits);
cvec rx_csymbols = tx_csymbols + to_cvec(noise, -noise);
decbits = pam_c.demodulate_bits(rx_csymbols);
vec softbits_approx = pam_c.demodulate_soft_bits(rx_csymbols, N0, APPROX);
vec softbits = pam_c.demodulate_soft_bits(rx_csymbols, N0, LOGMAP);
cout << "* modulating bits:" << endl;
cout << " tx_bits = " << tx_bits << endl;
cout << " tx_csymbols = " << tx_csymbols << endl;
cout << " rx_csymbols = " << rx_csymbols << endl;
cout << " decbits = " << decbits << endl;
cout << " softbits = " << softbits << endl;
cout << " softbits_approx = " << softbits_approx << endl << endl;
}
cout << "===========================================================" << endl;
{
cout << endl << "Modulator_2D (configured as 256-QAM)" << endl;
QAM qam(256);
Modulator_2D mod(qam.get_symbols(), qam.get_bits2symbols());
int bps = round_i(mod.bits_per_symbol());
bvec tx_bits = randb(no_symbols * bps);
ivec tx_sym_numbers = randi(no_symbols, 0, pow2i(bps) - 1);
cvec noise = sqrt(N0) * randn_c(no_symbols);
cvec tx_symbols = mod.modulate(tx_sym_numbers);
cvec rx_symbols = tx_symbols + noise;
ivec dec_sym_numbers = mod.demodulate(rx_symbols);
cout << "* modulating symbol numbers:" << endl;
cout << " tx_sym_numbers = " << tx_sym_numbers << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " dec_sym_numbers = " << dec_sym_numbers << endl;
tx_symbols = mod.modulate_bits(tx_bits);
rx_symbols = tx_symbols + noise;
bvec decbits = mod.demodulate_bits(rx_symbols);
vec softbits_approx = mod.demodulate_soft_bits(rx_symbols, N0, APPROX);
vec softbits = mod.demodulate_soft_bits(rx_symbols, N0, LOGMAP);
cout << "* modulating bits:" << endl;
cout << " tx_bits = " << tx_bits << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " decbits = " << decbits << endl;
cout << " softbits = " << softbits << endl;
cout << " softbits_approx = " << softbits_approx << endl;
cout << endl << "256-QAM" << endl;
tx_symbols = qam.modulate(tx_sym_numbers);
rx_symbols = tx_symbols + noise;
dec_sym_numbers = qam.demodulate(rx_symbols);
cout << "* modulating symbol numbers:" << endl;
cout << " tx_sym_numbers = " << tx_sym_numbers << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " dec_sym_numbers = " << dec_sym_numbers << endl;
tx_symbols = qam.modulate_bits(tx_bits);
rx_symbols = tx_symbols + noise;
decbits = qam.demodulate_bits(rx_symbols);
softbits_approx = qam.demodulate_soft_bits(rx_symbols, N0, APPROX);
softbits = qam.demodulate_soft_bits(rx_symbols, N0, LOGMAP);
cout << "* modulating bits:" << endl;
cout << " tx_bits = " << tx_bits << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " decbits = " << decbits << endl;
cout << " softbits = " << softbits << endl;
cout << " softbits_approx = " << softbits_approx << endl << endl;
}
cout << "===========================================================" << endl;
{
cout << endl << "8-PSK" << endl;
PSK psk(8);
int bps = round_i(psk.bits_per_symbol());
bvec tx_bits = randb(no_symbols * bps);
ivec tx_sym_numbers = randi(no_symbols, 0, pow2i(bps) - 1);
cvec noise = sqrt(N0) * randn_c(no_symbols);
cvec tx_symbols = psk.modulate(tx_sym_numbers);
cvec rx_symbols = tx_symbols + noise;
ivec dec_sym_numbers = psk.demodulate(rx_symbols);
cout << "* modulating symbol numbers:" << endl;
cout << " tx_sym_numbers = " << tx_sym_numbers << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " dec_sym_numbers = " << dec_sym_numbers << endl;
tx_symbols = psk.modulate_bits(tx_bits);
rx_symbols = tx_symbols + noise;
bvec decbits = psk.demodulate_bits(rx_symbols);
vec softbits_approx = psk.demodulate_soft_bits(rx_symbols, N0, APPROX);
vec softbits = psk.demodulate_soft_bits(rx_symbols, N0, LOGMAP);
cout << "* modulating bits:" << endl;
cout << " tx_bits = " << tx_bits << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " decbits = " << decbits << endl;
cout << " softbits = " << softbits << endl;
cout << " softbits_approx = " << softbits_approx << endl << endl;
}
cout << "===========================================================" << endl;
{
cout << endl << "16-QAM" << endl;
QAM qam(16);
int bps = round_i(qam.bits_per_symbol());
bvec tx_bits = randb(no_symbols * bps);
ivec tx_sym_numbers = randi(no_symbols, 0, pow2i(bps) - 1);
cvec noise = sqrt(N0) * randn_c(no_symbols);
cvec tx_symbols = qam.modulate(tx_sym_numbers);
cvec rx_symbols = tx_symbols + noise;
ivec dec_sym_numbers = qam.demodulate(rx_symbols);
cout << "* modulating symbol numbers:" << endl;
cout << " tx_sym_numbers = " << tx_sym_numbers << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " dec_sym_numbers = " << dec_sym_numbers << endl;
tx_symbols = qam.modulate_bits(tx_bits);
rx_symbols = tx_symbols + noise;
bvec decbits = qam.demodulate_bits(rx_symbols);
vec softbits_approx = qam.demodulate_soft_bits(rx_symbols, N0, APPROX);
vec softbits = qam.demodulate_soft_bits(rx_symbols, N0, LOGMAP);
cout << "* modulating bits:" << endl;
cout << " tx_bits = " << tx_bits << endl;
cout << " tx_symbols = " << tx_symbols << endl;
cout << " rx_symbols = " << rx_symbols << endl;
cout << " decbits = " << decbits << endl;
cout << " softbits = " << softbits << endl;
cout << " softbits_approx = " << softbits_approx << endl << endl;
}
}
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