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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)
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added unmodified mmbtools
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diff --git a/src/DifferentialModulator.cpp b/src/DifferentialModulator.cpp
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+/*
+ Copyright (C) 2005, 2006, 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 "DifferentialModulator.h"
+#include "PcDebug.h"
+
+#include <stdio.h>
+#include <stdexcept>
+#include <complex>
+#include <string.h>
+
+typedef std::complex<float> complexf;
+
+
+DifferentialModulator::DifferentialModulator(size_t carriers) :
+ ModMux(ModFormat(carriers * sizeof(complexf)), ModFormat(carriers * sizeof(complexf))),
+ d_carriers(carriers)
+{
+ PDEBUG("DifferentialModulator::DifferentialModulator(%zu)\n", carriers);
+
+}
+
+
+DifferentialModulator::~DifferentialModulator()
+{
+ PDEBUG("DifferentialModulator::~DifferentialModulator()\n");
+
+}
+
+
+// dataIn[0] -> phase reference
+// dataIn[1] -> data symbols
+int DifferentialModulator::process(std::vector<Buffer*> dataIn, Buffer* dataOut)
+{
+#ifdef DEBUG
+ fprintf(stderr, "DifferentialModulator::process (dataIn:");
+ for (unsigned i = 0; i < dataIn.size(); ++i) {
+ fprintf(stderr, " %p", dataIn[i]);
+ }
+ fprintf(stderr, ", sizeIn: ");
+ for (unsigned i = 0; i < dataIn.size(); ++i) {
+ fprintf(stderr, " %zu", dataIn[i]->getLength());
+ }
+ fprintf(stderr, ", dataOut: %p, sizeOut: %zu)\n", dataOut, dataOut->getLength());
+#endif
+
+ if (dataIn.size() != 2) {
+ throw std::runtime_error(
+ "DifferentialModulator::process nb of input streams not 2!");
+ }
+
+ size_t phaseSize = dataIn[0]->getLength() / sizeof(complexf);
+ size_t dataSize = dataIn[1]->getLength() / sizeof(complexf);
+ dataOut->setLength((phaseSize + dataSize) * sizeof(complexf));
+
+ const complexf* phase = reinterpret_cast<const complexf*>(dataIn[0]->getData());
+ const complexf* in = reinterpret_cast<const complexf*>(dataIn[1]->getData());
+ complexf* out = reinterpret_cast<complexf*>(dataOut->getData());
+
+ if (phaseSize != d_carriers) {
+ throw std::runtime_error(
+ "DifferentialModulator::process input phase size not valid!");
+ }
+ if (dataSize % d_carriers != 0) {
+ throw std::runtime_error(
+ "DifferentialModulator::process input data size not valid!");
+ }
+
+ memcpy(dataOut->getData(), phase, phaseSize * sizeof(complexf));
+ for (size_t i = 0; i < dataSize; i += d_carriers) {
+ for (size_t j = 0; j < d_carriers; j += 4) {
+ out[d_carriers + j] = out[j] * in[j];
+ out[d_carriers + j + 1] = out[j + 1] * in[j + 1];
+ out[d_carriers + j + 2] = out[j + 2] * in[j + 2];
+ out[d_carriers + j + 3] = out[j + 3] * in[j + 3];
+ }
+ in += d_carriers;
+ out += d_carriers;
+ }
+
+ return dataOut->getLength();
+}