text: //
  // Copyright (C) 2014 OpenSim Ltd.
  //
  // This program is free software; you can redistribute it and/or
  // modify it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public License
  // along with this program; if not, see <http://www.gnu.org/licenses/>.
  //
  
  #include "inet/physicallayer/apskradio/bitlevel/ApskModulator.h"
  #include "inet/physicallayer/modulation/BpskModulation.h"
  #include "inet/physicallayer/modulation/Qam16Modulation.h"
  #include "inet/physicallayer/modulation/Qam64Modulation.h"
  #include "inet/physicallayer/modulation/QpskModulation.h"
  
  namespace inet {
  
  namespace physicallayer {
  
  Define_Module(ApskModulator);
  
  ApskModulator::ApskModulator() :
      modulation(nullptr)
  {
  }
  
  void ApskModulator::initialize(int stage)
  {
      if (stage == INITSTAGE_LOCAL)
          modulation = ApskModulationBase::findModulation(par("modulation"));
  }
  
  std::ostream& ApskModulator::printToStream(std::ostream& stream, int level) const
  {
      stream << "ApskModulator";
      if (level <= PRINT_LEVEL_TRACE)
          stream << ", modulation = " << printObjectToString(modulation, level + 1);
      return stream;
  }
  
  const ITransmissionSymbolModel *ApskModulator::modulate(const ITransmissionBitModel *bitModel) const
  {
      const BitVector *bits = bitModel->getBits();
      unsigned int codeWordSize = modulation->getCodeWordSize();
      if (bits->getSize() % codeWordSize != 0)
          throw cRuntimeError("Invalid bit length for code word size");
      ShortBitVector symbolBits;
      std::vector<const ISymbol *> *symbols = new std::vector<const ISymbol *>();
      for (unsigned int i = 0; i < bits->getSize(); i++) {
          symbolBits.setBit(i % codeWordSize, bits->getBit(i));
          if (i % codeWordSize == codeWordSize - 1)
              symbols->push_back(modulation->mapToConstellationDiagram(symbolBits));
      }
      // TODO: double symbolRate = bitModel->getBitRate() / modulation->getCodeWordSize();
      return new TransmissionSymbolModel(symbols->size(), NaN, symbols->size(), NaN, symbols, modulation, modulation);
  }
  
  } // namespace physicallayer
  
  } // namespace inet
  
  