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authorMatthias (think) <matthias@mpb.li>2012-07-11 11:49:12 +0200
committerMatthias (think) <matthias@mpb.li>2012-07-11 11:49:12 +0200
commite92f9c408634810828e75d4ad6da408e1c142195 (patch)
treed4e622617f58a70ed3dd2e57418f73f412e7193b /src/CicEqualizer.cpp
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added unmodified mmbtools
Diffstat (limited to 'src/CicEqualizer.cpp')
-rw-r--r--src/CicEqualizer.cpp96
1 files changed, 96 insertions, 0 deletions
diff --git a/src/CicEqualizer.cpp b/src/CicEqualizer.cpp
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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 CRC-DADMOD.
+
+ CRC-DADMOD 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.
+
+ CRC-DADMOD 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 CRC-DADMOD. 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(ModFormat(nbCarriers * sizeof(complexf)),
+ ModFormat(nbCarriers * sizeof(complexf))),
+ myNbCarriers(nbCarriers),
+ mySpacing(spacing)
+{
+ PDEBUG("CicEqualizer::CicEqualizer(%zu, %zu, %i) @ %p\n",
+ nbCarriers, spacing, R, this);
+
+ myFilter = new float[nbCarriers];
+ int M = 1;
+ int N = 4;
+ 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] = R;
+ } else {
+ myFilter[i] = sinf(angle / R) / sinf(angle * M);
+ }
+ myFilter[i] = fabsf(myFilter[i]) * R;
+ myFilter[i] = powf(myFilter[i], N);
+ myFilter[i] *= 0.5f;
+ 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);
+
+ if (myFilter != NULL) {
+ delete[] myFilter;
+ }
+}
+
+
+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;
+}