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/*!
* \file
* \brief Vector ("MIMO") modulator classes test program
* \author Erik G. Larsson, Adam Piatyszek, and Mirsad Cirkic
*
* -------------------------------------------------------------------------
*
* Copyright (C) 1995-2013 (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>
#include <itpp/itstat.h>
#include "gtest/gtest.h"
using namespace itpp;
template<class T>
void assert_vec_p(const Vec<T> &ref, const Vec<T> &act, int line)
{
static const double tol = 1e-3;
ASSERT_EQ(ref.length(), ref.length()) << line;
for (int n = 0; n < ref.length(); ++n) {
ASSERT_NEAR(ref(n), act(n), tol) << line;
}
}
#define assert_vec(ref,act) assert_vec_p(ref, act, __LINE__)
TEST(ModulatorNd, All)
{
// Test of ND (MIMO) Modulators
RNG_reset(12345);
double sigma2 = 0.05;
{ // --- Test for M-PAM, M^2-QAM, and M^2-PSK constellations
ND_UPAM pammod;
ND_UQAM qammod;
ND_UPSK pskmod;
int nt = 2;
for (int nb = 1; nb <= 2; nb++) {
pammod.set_M(2*nt, 1<<nb);
qammod.set_M(nt, 1<<2*nb);
pskmod.set_M(nt, 1<<2*nb);
bvec b=randb(2*nt*nb);
cvec xqam = qammod.modulate_bits(b);
cvec xpsk = pskmod.modulate_bits(b);
cmat Hc = randn_c(nt, nt);
cvec ec=sqrt(2*sigma2) * randn_c(nt);
cvec yqam = Hc * xqam + ec;
cvec ypsk = Hc * xpsk + ec;
vec x=pammod.modulate_bits(b);
mat H(2*nt,2*nt);
H.set_submatrix(0, 0, real(Hc)/sqrt(2.0));
H.set_submatrix(nt, 0, imag(Hc)/sqrt(2.0));
H.set_submatrix(nt, nt, real(Hc)/sqrt(2.0));
H.set_submatrix(0, nt, -imag(Hc)/sqrt(2.0));
vec y=H*x+sqrt(sigma2) * randn(2*nt);
QLLRvec LLR_ap = randi(2*nt*nb,-5000,5000);
QLLRvec LLR;
pammod.init_soft_demodulator(H, sigma2);
qammod.init_soft_demodulator(Hc, 2*sigma2);
pskmod.init_soft_demodulator(Hc, 2*sigma2);
pammod.demodulate_soft_bits(y, LLR_ap, LLR);
vec act = pammod.get_llrcalc().to_double(LLR);
vec ref;
switch (nb) {
case 1:
ref = "-61.2605 -21.5132 64.5134 -17.156";
break;
case 2:
ref = "-9.55176 2.23926 -15.8718 2.30127 12.1917 2.27637 9.37671 -2.38306";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref, act);
pammod.demodulate_soft_bits(y, H, sigma2, LLR_ap, LLR);
act = pammod.get_llrcalc().to_double(LLR);
switch (nb) {
case 1:
ref = "-61.2605 -21.5132 64.5134 -17.156";
break;
case 2:
ref = "-9.55176 2.23926 -15.8718 2.30127 12.1917 2.27637 9.37671 -2.38306";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref, act);
qammod.demodulate_soft_bits(yqam, LLR_ap, LLR);
act = qammod.get_llrcalc().to_double(LLR);
switch (nb) {
case 1:
ref = "-26.7622 -31.0969 20.4077 -25.7842";
break;
case 2:
ref = "-14.3232 3.77539 -38.3303 13.3435 44.6099 13.2417 3.77856 -11.3962";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref, act);
qammod.demodulate_soft_bits(yqam, Hc, 2*sigma2, LLR_ap, LLR);
act = qammod.get_llrcalc().to_double(LLR);
switch (nb) {
case 1:
ref = "-26.7622 -31.0969 20.4077 -25.7842";
break;
case 2:
ref = "-14.3232 3.77539 -38.3303 13.3435 44.6099 13.2417 3.77856 -11.3962";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref, act);
pskmod.demodulate_soft_bits(ypsk, LLR_ap, LLR);
act = pskmod.get_llrcalc().to_double(LLR);
switch (nb) {
case 1:
ref = "-28.6494 -28.8706 20.1487 -22.7725";
break;
case 2:
ref = "-23.209 -2.04126 -5.97974 0.705566 5.83984 15.2581 2.95044 -0.491211";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref, act);
pskmod.demodulate_soft_bits(ypsk, Hc, 2*sigma2, LLR_ap, LLR);
act = pskmod.get_llrcalc().to_double(LLR);
switch (nb) {
case 1:
ref = "-28.6494 -28.8706 20.1487 -22.7725";
break;
case 2:
ref = "-23.209 -2.04126 -5.97974 0.705566 5.83984 15.2581 2.95044 -0.491211";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref, act);
pammod.demodulate_soft_bits(y, LLR_ap, LLR, ND_UPAM::FULL_ENUM_MAXLOG);
act = pammod.get_llrcalc().to_double(LLR);
switch (nb) {
case 1:
ref = "-61.2605 -21.5132 64.5134 -17.156";
break;
case 2:
ref = "-9.38965 2.40625 -16.5156 2.302 12.1526 2.302 9.17822 -2.40625";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref, act);
LLR_calc_unit llrcalctmp=pammod.get_llrcalc();
pammod.set_llrcalc(LLR_calc_unit(12, 0, 7));
pammod.demodulate_soft_bits(y, LLR_ap, LLR);
act = pammod.get_llrcalc().to_double(LLR);
switch (nb) {
case 1:
ref = "-61.2605 -21.5132 64.5134 -17.156";
break;
case 2:
ref = "-9.38965 2.40625 -16.5156 2.302 12.1526 2.302 9.17822 -2.40625";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref, act);
qammod.demodulate_soft_bits(yqam, LLR_ap, LLR, ND_UQAM::FULL_ENUM_MAXLOG);
act = qammod.get_llrcalc().to_double(LLR);
switch (nb) {
case 1:
ref = "-26.7622 -31.0969 20.4077 -26.2703";
break;
case 2:
ref = "-14.3618 3.79297 -38.3418 13.7219 44.8179 13.626 3.79297 -11.3765";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref, act);
pskmod.demodulate_soft_bits(ypsk, LLR_ap, LLR, ND_UPSK::FULL_ENUM_MAXLOG);
act = pskmod.get_llrcalc().to_double(LLR);
switch (nb) {
case 1:
ref = "-28.6494 -28.8706 20.1489 -22.7754";
break;
case 2:
ref = "-22.5317 -1.95972 -5.72705 0.475098 5.49121 14.6724 2.47705 -0.475098";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref, act);
pammod.set_llrcalc(llrcalctmp);
pammod.demodulate_soft_bits(y, diag(H), sigma2, LLR_ap, LLR);
act = pammod.get_llrcalc().to_double(LLR);
switch (nb) {
case 1:
ref = "1.36011 6.94312 -0.0161133 -12.0933";
break;
case 2:
ref = "2.62354 1.00073 -17.6406 8.08691 -1.66406 0.052002 2.45728 0.338379";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref, act);
pammod.demodulate_soft_bits(y, H, sigma2, LLR_ap, LLR, ND_UPAM::ZF_LOGMAP);
act = pammod.get_llrcalc().to_double(LLR);
switch (nb) {
case 1:
ref = "-19.4644 -7.35938 18.3091 -6.09521";
break;
case 2:
ref = "-8.52222 1.0542 -15.8455 3.78247 12.3943 3.12109 5.45532 -2.86353";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
ivec zhat;
ivec ref_i;
pammod.sphere_decoding(y, H, 0.01, 10000, 2.0, zhat);
switch (nb) {
case 1:
ref_i = "-1000 -1000 1000 -1000";
break;
case 2:
ref_i = "-1000 1000 -1000 1000 1000 1000 1000 -1000";
break;
default:
ASSERT_TRUE(false) << "should not be here";
}
assert_vec(ref_i, zhat);
}
}
{ // --- Test for M-PAM and M^2-QAM with variable constellations
ND_UQAM qammod;
ND_UPAM pammod;
int nt = 3;
qammod.set_M(nt, "4 64 16");
pammod.set_M(2*nt, "2 8 4 2 8 4");
cmat Hc = randn_c(nt, nt);
mat H(2*nt,2*nt);
H.set_submatrix(0, 0, real(Hc)/sqrt(2.0));
H.set_submatrix(nt, 0, imag(Hc)/sqrt(2.0));
H.set_submatrix(nt, nt, real(Hc)/sqrt(2.0));
H.set_submatrix(0, nt, -imag(Hc)/sqrt(2.0));
QLLRvec LLR_ap = zeros_i(sum(qammod.get_k()));
pammod.init_soft_demodulator(H, sigma2);
qammod.init_soft_demodulator(Hc, 2*sigma2);
double pamerrs=0, qamerrs=0;
int TRIALS=1000;
for(int i=0; i<TRIALS; i++){
bvec b=randb(sum(pammod.get_k()));
cvec xqam = qammod.modulate_bits(b);
cvec yqam = Hc * xqam + sqrt(2*sigma2) * randn_c(nt);
vec x=pammod.modulate_bits(b);
vec y=H*x+sqrt(sigma2) * randn(2*nt);
QLLRvec LLR;
pammod.demodulate_soft_bits(y, LLR_ap, LLR);
pamerrs+=hamming_distance(LLR<0,b);
qammod.demodulate_soft_bits(yqam, LLR_ap, LLR);
qamerrs+=hamming_distance(LLR<0,b);
}
pamerrs/=TRIALS*sum(pammod.get_k());
qamerrs/=TRIALS*sum(pammod.get_k());
ASSERT_EQ(round_i(100*qamerrs), round_i(100*pamerrs));
bvec b=randb(sum(pammod.get_k()));
cvec xqam = qammod.modulate_bits(b);
cvec yqam = Hc * xqam + sqrt(2*sigma2) * randn_c(nt);
vec x=pammod.modulate_bits(b);
vec y=H*x+sqrt(sigma2) * randn(2*nt);
QLLRvec LLR;
pammod.demodulate_soft_bits(y, LLR_ap, LLR);
vec act = pammod.get_llrcalc().to_double(LLR);
vec ref = "34.6016 -2.96387 -30.106 11.395 16.1267 -3.16919 29.9153 50.3799 4.47412 -8.37354 23.3008 3.49634";
assert_vec(ref, act);
qammod.demodulate_soft_bits(yqam, LLR_ap, LLR);
act = qammod.get_llrcalc().to_double(LLR);
ref = "60.292 -58.8679 -98.0229 22.6648 6.70361 -107.042 22.8962 3.21558 12.7021 -7.41406 34.2944 6.74219";
assert_vec(ref, act);
}
}
|
