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/*!
* \file
* \brief Implementation of Bit Error Rate Counter (BERC) and
* BLock Error Rate Counter (BLERC) classes
* \author Pal Frenger 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/comm/error_counters.h>
#include <itpp/base/matfunc.h>
#include <itpp/base/converters.h>
#include <iostream>
#include <iomanip>
#include <cstdlib>
namespace itpp {
//-----------------------------------------------------------
// The Bit error rate counter class (BERC)
//-----------------------------------------------------------
BERC::BERC(int indelay, int inignorefirst, int inignorelast):
delay(indelay), ignorefirst(inignorefirst), ignorelast(inignorelast),
errors(0), corrects(0) {}
void BERC::count(const bvec &in1, const bvec &in2)
{
int countlength = std::min(in1.length(), in2.length()) - std::abs(delay)
- ignorefirst - ignorelast;
if (delay >= 0) {
for (int i = 0; i < countlength; i++) {
if (in1(i + ignorefirst) == in2(i + ignorefirst + delay)) {
corrects++;
}
else {
errors++;
}
}
}
else {
for (int i = 0; i < countlength; i++) {
if (in1(i + ignorefirst - delay) == in2(i + ignorefirst)) {
corrects++;
}
else {
errors++;
}
}
}
}
void BERC::estimate_delay(const bvec &in1, const bvec &in2, int mindelay,
int maxdelay)
{
int num, start1, start2;
int min_input_length = std::min(in1.length(), in2.length());
int bestdelay = mindelay;
double correlation;
double bestcorr = 0;
for (int i = mindelay; i < maxdelay; i++) {
num = min_input_length - std::abs(i) - ignorefirst - ignorelast;
start1 = (i < 0) ? -i : 0;
start2 = (i > 0) ? i : 0;
correlation = fabs(sum(to_vec(elem_mult(in1.mid(start1, num),
in2.mid(start2, num)))));
if (correlation > bestcorr) {
bestdelay = i;
bestcorr = correlation;
}
}
delay = bestdelay;
}
void BERC::report() const
{
std::cout.setf(std::ios::fixed);
std::cout << std::endl
<< "==================================" << std::endl
<< " Bit Error Counter Report " << std::endl
<< "==================================" << std::endl
<< " Ignore First = " << ignorefirst << std::endl
<< " Ignore Last = " << ignorelast << std::endl
<< " Delay = " << delay << std::endl
<< " Number of counted bits = " << std::setprecision(0)
<< (errors + corrects) << std::endl
<< " Number of errors = " << std::setprecision(0)
<< errors << std::endl
<< "==================================" << std::endl
<< " Error rate = " << std::setprecision(8)
<< (errors / (errors + corrects)) << std::endl
<< "==================================" << std::endl << std::endl;
}
double BERC::count_errors(const bvec &in1, const bvec &in2, int indelay,
int inignorefirst, int inignorelast)
{
int countlength = std::min(in1.length(), in2.length()) - std::abs(indelay)
- inignorefirst - inignorelast;
int local_errors = 0;
if (indelay >= 0) {
for (int i = 0; i < countlength; i++) {
if (in1(i + inignorefirst) != in2(i + inignorefirst + indelay)) {
local_errors++;
}
}
}
else {
for (int i = 0; i < countlength; i++) {
if (in1(i + inignorefirst - indelay) != in2(i + inignorefirst)) {
local_errors++;
}
}
}
return local_errors;
}
//-----------------------------------------------------------
// The Block error rate counter class (BERC)
//-----------------------------------------------------------
BLERC::BLERC(): setup_done(false), blocksize(0), errors(0),
corrects(0) {}
BLERC::BLERC(int inblocksize): setup_done(true), blocksize(inblocksize),
errors(0), corrects(0) {}
void BLERC::set_blocksize(int inblocksize, bool clear)
{
blocksize = inblocksize;
if (clear) {
errors = 0;
corrects = 0;
}
setup_done = true;
}
void BLERC::count(const bvec &in1, const bvec &in2)
{
it_assert(setup_done == true,
"BLERC::count(): Block size has to be setup before counting errors.");
int min_input_length = std::min(in1.length(), in2.length());
it_assert(blocksize <= min_input_length,
"BLERC::count(): Block size must not be longer than input vectors.");
for (int i = 0; i < (min_input_length / blocksize); i++) {
CORR = true;
for (int j = 0; j < blocksize; j++) {
if (in1(i * blocksize + j) != in2(i * blocksize + j)) {
CORR = false;
break;
}
}
if (CORR) {
corrects++;
}
else {
errors++;
}
}
}
} // namespace itpp
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