handles interference calculations More...

#include "interference-helper.h"

Collaboration diagram for ns3::InterferenceHelper:

Classes
class	Event
	Signal event for a packet. More...

class	NiChange
	Noise and Interference (thus Ni) event. More...

struct	SnrPer
	A struct for both SNR and PER. More...

Public Member Functions
	InterferenceHelper ()

	~InterferenceHelper ()

Ptr< InterferenceHelper::Event >	Add (Ptr< const Packet > packet, WifiTxVector txVector, Time duration, double rxPower)
	Add the packet-related signal to interference helper. More...

void	AddForeignSignal (Time duration, double rxPower)
	Add a non-Wifi signal to interference helper. More...

struct InterferenceHelper::SnrPer	CalculatePlcpHeaderSnrPer (Ptr< InterferenceHelper::Event > event)
	Calculate the SNIR at the start of the plcp header and accumulate all SNIR changes in the snir vector. More...

struct InterferenceHelper::SnrPer	CalculatePlcpPayloadSnrPer (Ptr< InterferenceHelper::Event > event)
	Calculate the SNIR at the start of the plcp payload and accumulate all SNIR changes in the snir vector. More...

void	EraseEvents (void)
	Erase all events. More...

Time	GetEnergyDuration (double energyW) const

Ptr< ErrorRateModel >	GetErrorRateModel (void) const
	Return the error rate model. More...

double	GetNoiseFigure (void) const
	Return the noise figure. More...

void	NotifyRxEnd ()
	Notify that RX has ended. More...

void	NotifyRxStart ()
	Notify that RX has started. More...

void	SetErrorRateModel (const Ptr< ErrorRateModel > rate)
	Set the error rate model for this interference helper. More...

void	SetNoiseFigure (double value)
	Set the noise figure. More...

void	SetNumberOfReceiveAntennas (uint8_t rx)
	Set the number of RX antennas in the receiver corresponding to this interference helper. More...

Private Types
typedef std::vector< NiChange >	NiChanges
	typedef for a vector of NiChanges More...

Private Member Functions
void	AddNiChangeEvent (NiChange change)
	Add NiChange to the list at the appropriate position. More...

void	AppendEvent (Ptr< Event > event)
	Append the given Event. More...

double	CalculateChunkSuccessRate (double snir, Time duration, WifiMode mode, WifiTxVector txVector) const
	Calculate the success rate of the chunk given the SINR, duration, and Wi-Fi mode. More...

double	CalculateNoiseInterferenceW (Ptr< Event > event, NiChanges *ni) const
	Calculate noise and interference power in W. More...

double	CalculatePlcpHeaderPer (Ptr< const Event > event, NiChanges *ni) const
	Calculate the error rate of the plcp header. More...

double	CalculatePlcpPayloadPer (Ptr< const Event > event, NiChanges *ni) const
	Calculate the error rate of the given plcp payload. More...

double	CalculateSnr (double signal, double noiseInterference, uint8_t channelWidth) const
	Calculate SNR (linear ratio) from the given signal power and noise+interference power. More...

NiChanges::const_iterator	GetPosition (Time moment)
	Returns a const iterator to the first nichange, which is later than moment. More...

Private Attributes
Ptr< ErrorRateModel >	m_errorRateModel
	error rate model More...

double	m_firstPower
	first power More...

NiChanges	m_niChanges
	Experimental: needed for energy duration calculation. More...

double	m_noiseFigure
	noise figure (linear) More...

uint8_t	m_numRxAntennas
	the number of RX antennas in the corresponding receiver More...

bool	m_rxing
	flag whether it is in receiving state More...

Detailed Description

handles interference calculations

Definition at line 35 of file interference-helper.h.

Member Typedef Documentation

typedef std::vector<NiChange> ns3::InterferenceHelper::NiChanges

private

typedef for a vector of NiChanges

Definition at line 261 of file interference-helper.h.

Constructor & Destructor Documentation

ns3::InterferenceHelper::InterferenceHelper ( )

Definition at line 133 of file interference-helper.cc.

ns3::InterferenceHelper::~InterferenceHelper ( )

Definition at line 141 of file interference-helper.cc.

References EraseEvents(), and m_errorRateModel.

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Member Function Documentation

Ptr< InterferenceHelper::Event > ns3::InterferenceHelper::Add	(	Ptr< const Packet >	packet,
		WifiTxVector	txVector,
		Time	duration,
		double	rxPower
	)

Add the packet-related signal to interference helper.

Parameters

packet	the packet
txVector	TXVECTOR of the packet
duration	the duration of the signal
rxPower	receive power (W)

Returns: InterferenceHelper::Event

Definition at line 148 of file interference-helper.cc.

References AppendEvent().

Referenced by AddForeignSignal(), and ns3::WifiPhy::StartReceivePreambleAndHeader().

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void ns3::InterferenceHelper::AddForeignSignal	(	Time	duration,
		double	rxPower
	)

Add a non-Wifi signal to interference helper.

Parameters

duration	the duration of the signal
rxPower	receive power (W)

Definition at line 157 of file interference-helper.cc.

References Add().

Referenced by ns3::SpectrumWifiPhy::StartRx().

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void ns3::InterferenceHelper::AddNiChangeEvent ( NiChange change )

private

Add NiChange to the list at the appropriate position.

Parameters

change

Definition at line 885 of file interference-helper.cc.

References GetPosition(), ns3::InterferenceHelper::NiChange::GetTime(), and m_niChanges.

Referenced by AppendEvent().

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void ns3::InterferenceHelper::AppendEvent ( Ptr< Event > event )

private

Append the given Event.

Parameters

event

Definition at line 220 of file interference-helper.cc.

References AddNiChangeEvent(), GetPosition(), m_firstPower, m_niChanges, m_rxing, and ns3::Simulator::Now().

Referenced by Add().

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double ns3::InterferenceHelper::CalculateChunkSuccessRate	(	double	snir,
		Time	duration,
		WifiMode	mode,
		WifiTxVector	txVector
	)		const

private

Calculate the success rate of the chunk given the SINR, duration, and Wi-Fi mode.

The duration and mode are used to calculate how many bits are present in the chunk.

Parameters

snir	SINR
duration
mode
txVector

Returns: the success rate

Definition at line 300 of file interference-helper.cc.

References ns3::WifiTxVector::GetMode(), ns3::WifiMode::GetModulationClass(), ns3::WifiTxVector::GetNss(), ns3::WifiTxVector::GetNTx(), ns3::WifiMode::GetPhyRate(), ns3::Time::GetSeconds(), ns3::Time::IsZero(), m_errorRateModel, m_numRxAntennas, NS_LOG_DEBUG, ns3::WIFI_MOD_CLASS_HE, ns3::WIFI_MOD_CLASS_HT, and ns3::WIFI_MOD_CLASS_VHT.

Referenced by CalculatePlcpHeaderPer(), and CalculatePlcpPayloadPer().

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double ns3::InterferenceHelper::CalculateNoiseInterferenceW	(	Ptr< Event >	event,
		NiChanges *	ni
	)		const

private

Calculate noise and interference power in W.

Parameters

event
ni

Returns: noise and interference power

Definition at line 258 of file interference-helper.cc.

References m_firstPower, and m_niChanges.

Referenced by CalculatePlcpHeaderSnrPer(), and CalculatePlcpPayloadSnrPer().

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double ns3::InterferenceHelper::CalculatePlcpHeaderPer	(	Ptr< const Event >	event,
		NiChanges *	ni
	)		const

private

Calculate the error rate of the plcp header.

The plcp header can be divided into multiple chunks (e.g. due to interference from other transmissions).

Parameters

event
ni

Returns: the error rate of the packet

Definition at line 373 of file interference-helper.cc.

Referenced by CalculatePlcpHeaderSnrPer().

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struct InterferenceHelper::SnrPer ns3::InterferenceHelper::CalculatePlcpHeaderSnrPer ( Ptr< InterferenceHelper::Event > event )

Calculate the SNIR at the start of the plcp header and accumulate all SNIR changes in the snir vector.

Parameters

event the event corresponding to the first time the corresponding packet arrives

Returns: struct of SNR and PER

Definition at line 851 of file interference-helper.cc.

References CalculateNoiseInterferenceW(), CalculatePlcpHeaderPer(), CalculateSnr(), ns3::InterferenceHelper::SnrPer::per, and ns3::InterferenceHelper::SnrPer::snr.

Referenced by ns3::WifiPhy::StartReceivePacket().

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double ns3::InterferenceHelper::CalculatePlcpPayloadPer	(	Ptr< const Event >	event,
		NiChanges *	ni
	)		const

private

Calculate the error rate of the given plcp payload.

The plcp payload can be divided into multiple chunks (e.g. due to interference from other transmissions).

Parameters

event
ni

Returns: the error rate of the packet

Definition at line 320 of file interference-helper.cc.

References CalculateChunkSuccessRate(), CalculateSnr(), ns3::WifiTxVector::GetChannelWidth(), ns3::WifiPhy::GetPlcpHeaderDuration(), ns3::WifiPhy::GetPlcpHtSigHeaderDuration(), ns3::WifiPhy::GetPlcpPreambleDuration(), ns3::WifiPhy::GetPlcpSigA1Duration(), ns3::WifiPhy::GetPlcpSigA2Duration(), ns3::WifiPhy::GetPlcpSigBDuration(), ns3::WifiPhy::GetPlcpTrainingSymbolDuration(), ns3::WifiTxVector::GetPreambleType(), NS_ASSERT, NS_LOG_DEBUG, and NS_LOG_FUNCTION.

Referenced by CalculatePlcpPayloadSnrPer().

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struct InterferenceHelper::SnrPer ns3::InterferenceHelper::CalculatePlcpPayloadSnrPer ( Ptr< InterferenceHelper::Event > event )

Calculate the SNIR at the start of the plcp payload and accumulate all SNIR changes in the snir vector.

Parameters

event the event corresponding to the first time the corresponding packet arrives

Returns: struct of SNR and PER

Definition at line 831 of file interference-helper.cc.

References CalculateNoiseInterferenceW(), CalculatePlcpPayloadPer(), CalculateSnr(), ns3::InterferenceHelper::SnrPer::per, and ns3::InterferenceHelper::SnrPer::snr.

Referenced by ns3::WifiPhy::EndReceive().

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double ns3::InterferenceHelper::CalculateSnr	(	double	signal,
		double	noiseInterference,
		uint8_t	channelWidth
	)		const

private

Calculate SNR (linear ratio) from the given signal power and noise+interference power.

(Mode is not currently used)

Parameters

signal
noiseInterference
channelWidth

Returns: SNR in liear ratio

Definition at line 243 of file interference-helper.cc.

References m_noiseFigure, and NS_LOG_DEBUG.

Referenced by CalculatePlcpHeaderPer(), CalculatePlcpHeaderSnrPer(), CalculatePlcpPayloadPer(), and CalculatePlcpPayloadSnrPer().

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void ns3::InterferenceHelper::EraseEvents ( void )

Erase all events.

Definition at line 871 of file interference-helper.cc.

References m_firstPower, m_niChanges, and m_rxing.

Referenced by ns3::WifiPhy::DoChannelSwitch(), ns3::WifiPhy::DoFrequencySwitch(), and ~InterferenceHelper().

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Time ns3::InterferenceHelper::GetEnergyDuration ( double energyW ) const

Parameters

energyW the minimum energy (W) requested

Returns: the expected amount of time the observed energy on the medium will be higher than the requested threshold.

Definition at line 197 of file interference-helper.cc.

References m_firstPower, m_niChanges, ns3::MicroSeconds(), and ns3::Simulator::Now().

Referenced by ns3::WifiPhy::MaybeCcaBusyDuration(), ns3::WifiPhy::ResumeFromSleep(), and ns3::WifiPhy::SwitchMaybeToCcaBusy().

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Ptr< ErrorRateModel > ns3::InterferenceHelper::GetErrorRateModel ( void ) const

Return the error rate model.

Returns: Error rate model

Definition at line 185 of file interference-helper.cc.

References m_errorRateModel.

Referenced by ns3::WifiPhy::CalculateSnr(), and ns3::WifiPhy::GetErrorRateModel().

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double ns3::InterferenceHelper::GetNoiseFigure ( void ) const

Return the noise figure.

Returns: the noise figure

Definition at line 173 of file interference-helper.cc.

References m_noiseFigure.

Referenced by ns3::WifiPhy::GetRxNoiseFigure().

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InterferenceHelper::NiChanges::const_iterator ns3::InterferenceHelper::GetPosition ( Time moment )

private

Returns a const iterator to the first nichange, which is later than moment.

Parameters

moment time to check from

Returns: an iterator to the list of NiChanges

Definition at line 879 of file interference-helper.cc.

References m_niChanges.

Referenced by AddNiChangeEvent(), and AppendEvent().

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void ns3::InterferenceHelper::NotifyRxEnd ( )

Notify that RX has ended.

Definition at line 898 of file interference-helper.cc.

References m_rxing, and NS_LOG_FUNCTION.

Referenced by ns3::WifiPhy::AbortCurrentReception(), ns3::WifiPhy::EndReceive(), and ns3::WifiPhy::SendPacket().

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void ns3::InterferenceHelper::NotifyRxStart ( void )

Notify that RX has started.

Definition at line 891 of file interference-helper.cc.

References m_rxing, and NS_LOG_FUNCTION.

Referenced by ns3::WifiPhy::StartRx().

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void ns3::InterferenceHelper::SetErrorRateModel ( const Ptr< ErrorRateModel > rate )

Set the error rate model for this interference helper.

Parameters

rate	Error rate model

Definition at line 179 of file interference-helper.cc.

References m_errorRateModel.

Referenced by ns3::WifiPhy::SetErrorRateModel().

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void ns3::InterferenceHelper::SetNoiseFigure ( double value )

Set the noise figure.

Parameters

value noise figure

Definition at line 167 of file interference-helper.cc.

References m_noiseFigure.

Referenced by ns3::WifiPhy::SetRxNoiseFigure().

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void ns3::InterferenceHelper::SetNumberOfReceiveAntennas ( uint8_t rx )

Set the number of RX antennas in the receiver corresponding to this interference helper.

Parameters

rx	the number of RX antennas

Definition at line 191 of file interference-helper.cc.

References m_numRxAntennas.

Referenced by ns3::WifiPhy::SetErrorRateModel(), ns3::WifiPhy::SetNumberOfAntennas(), and ns3::WifiPhy::SetRxNoiseFigure().

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Member Data Documentation

Ptr<ErrorRateModel> ns3::InterferenceHelper::m_errorRateModel

private

error rate model

Definition at line 323 of file interference-helper.h.

Referenced by CalculateChunkSuccessRate(), GetErrorRateModel(), SetErrorRateModel(), and ~InterferenceHelper().

double ns3::InterferenceHelper::m_firstPower

private

first power

Definition at line 327 of file interference-helper.h.

Referenced by AppendEvent(), CalculateNoiseInterferenceW(), EraseEvents(), and GetEnergyDuration().

NiChanges ns3::InterferenceHelper::m_niChanges

private

Experimental: needed for energy duration calculation.

Definition at line 326 of file interference-helper.h.

Referenced by AddNiChangeEvent(), AppendEvent(), CalculateNoiseInterferenceW(), EraseEvents(), GetEnergyDuration(), and GetPosition().

double ns3::InterferenceHelper::m_noiseFigure

private

noise figure (linear)

Definition at line 322 of file interference-helper.h.

Referenced by CalculateSnr(), GetNoiseFigure(), and SetNoiseFigure().

uint8_t ns3::InterferenceHelper::m_numRxAntennas

private

the number of RX antennas in the corresponding receiver

Definition at line 324 of file interference-helper.h.

Referenced by CalculateChunkSuccessRate(), and SetNumberOfReceiveAntennas().

bool ns3::InterferenceHelper::m_rxing

private

flag whether it is in receiving state

Definition at line 328 of file interference-helper.h.

Referenced by AppendEvent(), EraseEvents(), NotifyRxEnd(), and NotifyRxStart().

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

src/wifi/model/interference-helper.h
src/wifi/model/interference-helper.cc

Classes

Public Member Functions

Private Types

Private Member Functions

Private Attributes

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation