#include <Ieee80211OFDMModulator.h>

Inheritance diagram for inet::physicallayer::Ieee80211OFDMModulator:

Public Member Functions
	Ieee80211OFDMModulator (const Ieee80211OFDMModulation *subcarrierModulation, unsigned int polarityVectorOffset)

virtual const ITransmissionSymbolModel *	modulate (const ITransmissionBitModel *bitModel) const override

const Ieee80211OFDMModulation *	getModulation () const override

virtual std::ostream &	printToStream (std::ostream &stream, int level) const override
	Prints this object to the provided output stream. More...

Public Member Functions inherited from inet::physicallayer::IPrintableObject
virtual	~IPrintableObject ()

virtual std::string	getInfoStringRepresentation () const

virtual std::string	getDetailStringRepresentation () const

virtual std::string	getDebugStringRepresentation () const

virtual std::string	getTraceStringRepresentation () const

virtual std::string	getCompleteStringRepresentation () const

Static Public Attributes
static const APSKSymbol	negativePilotSubcarrier

static const APSKSymbol	positivePilotSubcarrier

Protected Member Functions
int	getSubcarrierIndex (int ofdmSymbolIndex) const

void	insertPilotSubcarriers (Ieee80211OFDMSymbol *ofdmSymbol, int symbolID) const

Protected Attributes
const Ieee80211OFDMModulation *	subcarrierModulation

unsigned int	pilotSubcarrierPolarityVectorOffset

Static Protected Attributes
static const double	pilotSubcarrierPolarityVector [127]

Additional Inherited Members
Public Types inherited from inet::physicallayer::IPrintableObject
enum	PrintLevel { PRINT_LEVEL_TRACE, PRINT_LEVEL_DEBUG, PRINT_LEVEL_DETAIL, PRINT_LEVEL_INFO, PRINT_LEVEL_COMPLETE = INT_MIN }

Constructor & Destructor Documentation

inet::physicallayer::Ieee80211OFDMModulator::Ieee80211OFDMModulator	(	const Ieee80211OFDMModulation *	subcarrierModulation,
		unsigned int	polarityVectorOffset
	)

                                                                                                                                      :
     subcarrierModulation(subcarrierModulation),
     pilotSubcarrierPolarityVectorOffset(polarityVectorOffset)
 {
 }

Member Function Documentation

const Ieee80211OFDMModulation* inet::physicallayer::Ieee80211OFDMModulator::getModulation ( ) const

inlineoverridevirtual

Implements inet::physicallayer::IModulator.

Referenced by inet::physicallayer::Ieee80211OFDMModulatorModule::getModulation().

51 { return subcarrierModulation; }

inet::physicallayer::Ieee80211OFDMModulator::subcarrierModulation

const Ieee80211OFDMModulation * subcarrierModulation

Definition: Ieee80211OFDMModulator.h:39

int inet::physicallayer::Ieee80211OFDMModulator::getSubcarrierIndex ( int ofdmSymbolIndex ) const

protected

Referenced by modulate().

 {
     // This is the translated version of the M(k) function defined in 18.3.5.10 OFDM modulation: (18-23) equation.
     // We translate it by 26 since its range is [-26,26] and we use subcarrier indices as array indices.
     if (ofdmSymbolIndex >= 0 && ofdmSymbolIndex <= 4)
         return ofdmSymbolIndex;
     else if (ofdmSymbolIndex >= 5 && ofdmSymbolIndex <= 17)
         return ofdmSymbolIndex + 1;
     else if (ofdmSymbolIndex >= 18 && ofdmSymbolIndex <= 23)
         return ofdmSymbolIndex + 2;
     else if (ofdmSymbolIndex >= 24 && ofdmSymbolIndex <= 29)
         return ofdmSymbolIndex + 3;
     else if (ofdmSymbolIndex >= 30 && ofdmSymbolIndex <= 42)
         return ofdmSymbolIndex + 4;
     else if (ofdmSymbolIndex >= 43 && ofdmSymbolIndex <= 47)
         return ofdmSymbolIndex + 5;
     else
         throw cRuntimeError("The domain of the M(k) (k = %d) function is [0,47]", ofdmSymbolIndex);
 }

void inet::physicallayer::Ieee80211OFDMModulator::insertPilotSubcarriers	(	Ieee80211OFDMSymbol *	ofdmSymbol,
		int	symbolID
	)		const

protected

Referenced by modulate().

 {
     ofdmSymbol->pushAPSKSymbol(pilotSubcarrierPolarityVector[symbolID % 127] == 1 ? &positivePilotSubcarrier : &negativePilotSubcarrier, 5);
     ofdmSymbol->pushAPSKSymbol(pilotSubcarrierPolarityVector[symbolID % 127] == 1 ? &positivePilotSubcarrier : &negativePilotSubcarrier, 19);
     ofdmSymbol->pushAPSKSymbol(pilotSubcarrierPolarityVector[symbolID % 127] == 1 ? &positivePilotSubcarrier : &negativePilotSubcarrier, 33);
     ofdmSymbol->pushAPSKSymbol(pilotSubcarrierPolarityVector[symbolID % 127] == 1 ? &negativePilotSubcarrier : &positivePilotSubcarrier, 47);
 }

const ITransmissionSymbolModel * inet::physicallayer::Ieee80211OFDMModulator::modulate ( const ITransmissionBitModel * bitModel ) const

overridevirtual

Implements inet::physicallayer::IModulator.

Referenced by inet::physicallayer::Ieee80211LayeredOFDMTransmitter::encodeAndModulate(), and inet::physicallayer::Ieee80211OFDMModulatorModule::modulate().

 {
     std::vector<const ISymbol *> *ofdmSymbols = new std::vector<const ISymbol *>();
     const APSKModulationBase *modulationScheme = subcarrierModulation->getSubcarrierModulation();
     const BitVector *bits = bitModel->getBits();
     // Divide the resulting coded and interleaved data string into groups of N_BPSC bits.
     unsigned int nBPSC = modulationScheme->getCodeWordSize();
     ShortBitVector bitGroup;
     std::vector<const APSKSymbol *> apskSymbols;
     for (unsigned int i = 0; i < bits->getSize(); i++) {
         // For each of the bit groups, convert the bit group into a complex number according
         // to the modulation encoding tables
         bitGroup.setBit(i % nBPSC, bits->getBit(i));
         if (i % nBPSC == nBPSC - 1) {
             const APSKSymbol *apskSymbol = modulationScheme->mapToConstellationDiagram(bitGroup);
             apskSymbols.push_back(apskSymbol);
         }
     }
     // Divide the complex number string into groups of 48 complex numbers.
     // Each such group is associated with one OFDM symbol.
     for (unsigned int i = 0; i < apskSymbols.size(); i += NUMBER_OF_OFDM_DATA_SUBCARRIERS) {
         Ieee80211OFDMSymbol *ofdmSymbol = new Ieee80211OFDMSymbol();
         // In each group, the complex numbers are numbered 0 to 47 and mapped hereafter into OFDM
         // subcarriers numbered -26 to -22, -20 to -8, -6 to -1, 1 to 6, 8 to 20, and 22 to 26.
         // The 0 subcarrier, associated with center frequency, is omitted and filled with the value 0.
         for (unsigned int j = 0; j < NUMBER_OF_OFDM_DATA_SUBCARRIERS; j++) {
             int subcarrierIndex = getSubcarrierIndex(j);
             ofdmSymbol->pushAPSKSymbol(apskSymbols.at(j + i), subcarrierIndex);
         }
         insertPilotSubcarriers(ofdmSymbol, i / NUMBER_OF_OFDM_DATA_SUBCARRIERS + pilotSubcarrierPolarityVectorOffset);
         EV_DEBUG << "Modulated OFDM symbol: " << *ofdmSymbol << endl;
         ofdmSymbols->push_back(ofdmSymbol);
     }
     return new Ieee80211OFDMTransmissionSymbolModel(1, NaN, ofdmSymbols->size() - 1, NaN, ofdmSymbols, modulationScheme, modulationScheme);
 }

std::ostream & inet::physicallayer::Ieee80211OFDMModulator::printToStream	(	std::ostream &	stream,
		int	level
	)		const

overridevirtual

Prints this object to the provided output stream.

Function calls to operator<< with pointers or references either const or not are all forwarded to this function.

Reimplemented from inet::physicallayer::IPrintableObject.

Referenced by inet::physicallayer::Ieee80211OFDMModulatorModule::printToStream().

 {
     stream << "Ieee80211OFDMModulator";
     if (level <= PRINT_LEVEL_TRACE)
         stream << ", subcarrierModulation = " << printObjectToString(subcarrierModulation, level + 1);
     return stream;
 }

Member Data Documentation

const APSKSymbol inet::physicallayer::Ieee80211OFDMModulator::negativePilotSubcarrier

static

Referenced by insertPilotSubcarriers().

const double inet::physicallayer::Ieee80211OFDMModulator::pilotSubcarrierPolarityVector

staticprotected

Initial value:

= {
    1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1,
    1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1,
    -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, -1, 1, -1, 1,
    -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, -1, 1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1
}

Referenced by insertPilotSubcarriers().

unsigned int inet::physicallayer::Ieee80211OFDMModulator::pilotSubcarrierPolarityVectorOffset

protected

Referenced by modulate().

const APSKSymbol inet::physicallayer::Ieee80211OFDMModulator::positivePilotSubcarrier

static

Referenced by insertPilotSubcarriers().

const Ieee80211OFDMModulation* inet::physicallayer::Ieee80211OFDMModulator::subcarrierModulation

protected

Referenced by modulate(), and printToStream().

The documentation for this class was generated from the following files: