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/*
Copyright (C) 2007, 2008, 2009, 2010, 2011 Her Majesty the Queen in
Right of Canada (Communications Research Center Canada)
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod 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.
ODR-DabMod 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 ODR-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#include "CicEqualizer.h"
#include "PcDebug.h"
#include <stdio.h>
#include <stdexcept>
CicEqualizer::CicEqualizer(size_t nbCarriers, size_t spacing, int R) :
ModCodec(),
myNbCarriers(nbCarriers),
mySpacing(spacing),
myFilter(nbCarriers)
{
PDEBUG("CicEqualizer::CicEqualizer(%zu, %zu, %i) @ %p\n",
nbCarriers, spacing, R, this);
const int M = 1;
const int N = 4;
const float pi = 4.0f * atanf(1.0f);
for (size_t i = 0; i < nbCarriers; ++i) {
int k = i < (nbCarriers + 1) / 2
? i + ((nbCarriers & 1) ^ 1)
: i - (int)nbCarriers;
float angle = pi * k / spacing;
if (k == 0) {
myFilter[i] = 1.0f;
}
else {
myFilter[i] = sinf(angle / R) / sinf(angle * M);
myFilter[i] = fabsf(myFilter[i]) * R * M;
myFilter[i] = powf(myFilter[i], N);
}
PDEBUG("HCic[%zu -> %i] = %f (%f dB) -> angle: %f\n",
i, k,myFilter[i], 20.0 * log10(myFilter[i]), angle);
}
}
CicEqualizer::~CicEqualizer()
{
PDEBUG("CicEqualizer::~CicEqualizer() @ %p\n", this);
}
int CicEqualizer::process(Buffer* const dataIn, Buffer* dataOut)
{
PDEBUG("CicEqualizer::process(dataIn: %p, dataOut: %p)\n",
dataIn, dataOut);
dataOut->setLength(dataIn->getLength());
const complexf* in = reinterpret_cast<const complexf*>(dataIn->getData());
complexf* out = reinterpret_cast<complexf*>(dataOut->getData());
size_t sizeIn = dataIn->getLength() / sizeof(complexf);
size_t sizeOut = dataOut->getLength() / sizeof(complexf);
if ((sizeIn % myNbCarriers) != 0) {
PDEBUG("%zu != %zu\n", sizeIn, myNbCarriers);
throw std::runtime_error(
"CicEqualizer::process input size not valid!");
}
for (size_t i = 0; i < sizeOut; ) {
for (size_t j = 0; j < myNbCarriers; ++j, ++i) {
out[i] = in[i] * myFilter[j];
}
}
return sizeOut;
}
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