handles interference calculations More...

#include "interference-helper.h"

Inheritance diagram for ns3::InterferenceHelper:

Collaboration diagram for ns3::InterferenceHelper:

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

struct	SnrPer
	Signal event for a PPDU. More...

Public Member Functions
	InterferenceHelper ()

	~InterferenceHelper ()

Ptr< Event >	Add (Ptr< const WifiPpdu > ppdu, WifiTxVector txVector, Time duration, double rxPower)
	Add the PPDU-related signal to interference helper. More...

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

struct InterferenceHelper::SnrPer	CalculateHtPhyHeaderSnrPer (Ptr< Event > event) const
	Calculate the SNIR at the start of the HT PHY header and accumulate all SNIR changes in the SNIR vector. More...

struct InterferenceHelper::SnrPer	CalculateNonHtPhyHeaderSnrPer (Ptr< Event > event) const
	Calculate the SNIR at the start of the non-HT PHY header and accumulate all SNIR changes in the SNIR vector. More...

struct InterferenceHelper::SnrPer	CalculatePayloadSnrPer (Ptr< Event > event, std::pair< Time, Time > relativeMpduStartStop) const
	Calculate the SNIR at the start of the payload and accumulate all SNIR changes in the SNIR vector for each MPDU of an A-MPDU. More...

double	CalculateSnr (Ptr< Event > event) const
	Calculate the SNIR for the event (starting from now until the event end). More...

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

Time	GetEnergyDuration (double energyW) const

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

Protected Member Functions
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	CalculateSnr (double signal, double noiseInterference, WifiTxVector txVector) const
	Calculate SNR (linear ratio) from the given signal power and noise+interference power. More...

Private Types
typedef std::multimap< Time, NiChange >	NiChanges
	typedef for a multimap of NiChanges More...

Private Member Functions
NiChanges::iterator	AddNiChangeEvent (Time moment, NiChange change)
	Add NiChange to the list at the appropriate position and return the iterator of the new event. More...

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

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

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

double	CalculateNonHtPhyHeaderPer (Ptr< const Event > event, NiChanges *ni) const
	Calculate the error rate of the non-HT PHY header. More...

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

double	CalculatePayloadPer (Ptr< const Event > event, NiChanges *ni, std::pair< Time, Time > window) const
	Calculate the error rate of the given PHY payload only in the provided time window (thus enabling per MPDU PER information). More...

NiChanges::const_iterator	GetNextPosition (Time moment) const
	Returns an iterator to the first NiChange that is later than moment. More...

NiChanges::const_iterator	GetPreviousPosition (Time moment) const
	Returns an iterator to the first NiChange that is later than moment. More...

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

double	m_firstPower
	first power in watts 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 119 of file interference-helper.h.

Member Typedef Documentation

◆ NiChanges

typedef std::multimap<Time, NiChange> ns3::InterferenceHelper::NiChanges

private

typedef for a multimap of NiChanges

Definition at line 312 of file interference-helper.h.

Constructor & Destructor Documentation

◆ InterferenceHelper()

ns3::InterferenceHelper::InterferenceHelper ( )

Definition at line 138 of file interference-helper.cc.

References AddNiChangeEvent().

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◆ ~InterferenceHelper()

ns3::InterferenceHelper::~InterferenceHelper ( )

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

References EraseEvents(), and m_errorRateModel.

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Member Function Documentation

◆ Add()

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

Add the PPDU-related signal to interference helper.

Parameters

ppdu	the PPDU
txVector	the TXVECTOR
rxPower	received power (W)

Returns: Event

Definition at line 155 of file interference-helper.cc.

References AppendEvent().

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

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◆ AddForeignSignal()

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

Add a non-Wifi signal to interference helper.

Parameters

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

Definition at line 163 of file interference-helper.cc.

References Add(), ns3::WifiMacHeader::SetType(), ns3::WIFI_MAC_QOSDATA, and ns3::WIFI_PHY_BAND_UNSPECIFIED.

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

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◆ AddNiChangeEvent()

InterferenceHelper::NiChanges::iterator ns3::InterferenceHelper::AddNiChangeEvent	(	Time	moment,
		NiChange	change
	)

private

Add NiChange to the list at the appropriate position and return the iterator of the new event.

Parameters

moment	time to check from
change	the NiChange to add

Returns: the iterator of the new event

Definition at line 837 of file interference-helper.cc.

References GetNextPosition(), and m_niChanges.

Referenced by AppendEvent(), EraseEvents(), and InterferenceHelper().

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◆ AppendEvent()

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

private

Append the given Event.

Parameters

event

Definition at line 217 of file interference-helper.cc.

References AddNiChangeEvent(), GetNextPosition(), GetPreviousPosition(), m_firstPower, m_niChanges, m_rxing, and NS_LOG_FUNCTION.

Referenced by Add().

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◆ CalculateChunkSuccessRate()

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

protected

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	the SINR
duration	the duration of the chunk
mode	the WifiMode
txVector	the TXVECTOR

Returns: the success rate

Definition at line 285 of file interference-helper.cc.

References ns3::WifiTxVector::GetChannelWidth(), ns3::WifiMode::GetDataRate(), ns3::Time::GetSeconds(), ns3::Time::IsZero(), and m_errorRateModel.

Referenced by CalculateHtPhyHeaderPer(), CalculateNonHtPhyHeaderPer(), and WifiErrorRateModelsTestCaseMimo::DoRun().

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◆ CalculateHtPhyHeaderPer()

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

private

Calculate the error rate of the HT PHY header.

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

Parameters

event	the event
ni	the NiChanges

Returns: the error rate of the HT PHY header

Definition at line 474 of file interference-helper.cc.

Referenced by CalculateHtPhyHeaderSnrPer().

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◆ CalculateHtPhyHeaderSnrPer()

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

Calculate the SNIR at the start of the HT PHY header and accumulate all SNIR changes in the SNIR vector.

Parameters

event the event corresponding to the first time the corresponding PPDU arrives

Returns: struct of SNR and PER

Definition at line 791 of file interference-helper.cc.

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

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

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◆ CalculateNoiseInterferenceW()

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

private

Calculate noise and interference power in W.

Parameters

event	the event
ni	the NiChanges

Returns: noise and interference power

Definition at line 264 of file interference-helper.cc.

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

Referenced by CalculateHtPhyHeaderSnrPer(), CalculateNonHtPhyHeaderSnrPer(), CalculatePayloadSnrPer(), and CalculateSnr().

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◆ CalculateNonHtPhyHeaderPer()

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

private

Calculate the error rate of the non-HT PHY header.

The non-HT PHY header can be divided into multiple chunks (e.g. due to interference from other transmissions).

Parameters

event	the event
ni	the NiChanges

Returns: the error rate of the non-HT PHY header

Definition at line 361 of file interference-helper.cc.

Referenced by CalculateNonHtPhyHeaderSnrPer().

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◆ CalculateNonHtPhyHeaderSnrPer()

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

Calculate the SNIR at the start of the non-HT PHY header and accumulate all SNIR changes in the SNIR vector.

Parameters

event the event corresponding to the first time the corresponding PPDU arrives

Returns: struct of SNR and PER

Definition at line 771 of file interference-helper.cc.

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

Referenced by ns3::WifiPhy::ContinueReceiveHeader(), and ns3::WifiPhy::StartReceiveHeader().

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◆ CalculatePayloadChunkSuccessRate()

double ns3::InterferenceHelper::CalculatePayloadChunkSuccessRate	(	double	snir,
		Time	duration,
		WifiTxVector	txVector
	)		const

private

Calculate the success rate of the payload 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	the SINR
duration	the duration of the chunk
txVector	the TXVECTOR

Returns: the success rate

Definition at line 298 of file interference-helper.cc.

References ns3::WifiMode::GetDataRate(), ns3::WifiTxVector::GetMode(), ns3::WifiTxVector::GetNss(), ns3::Time::GetSeconds(), ns3::Time::IsZero(), and m_errorRateModel.

Referenced by CalculatePayloadPer().

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◆ CalculatePayloadPer()

double ns3::InterferenceHelper::CalculatePayloadPer	(	Ptr< const Event >	event,
		NiChanges *	ni,
		std::pair< Time, Time >	window
	)		const

private

Calculate the error rate of the given PHY payload only in the provided time window (thus enabling per MPDU PER information).

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

Parameters

event	the event
ni	the NiChanges
window	time window (pair of start and end times) of PHY payload to focus on

Returns: the error rate of the payload

Definition at line 313 of file interference-helper.cc.

References CalculatePayloadChunkSuccessRate(), CalculateSnr(), ns3::WifiPhy::GetPhyHeaderDuration(), ns3::WifiPhy::GetPhyHtSigHeaderDuration(), ns3::WifiPhy::GetPhyPreambleDuration(), ns3::WifiPhy::GetPhySigA1Duration(), ns3::WifiPhy::GetPhySigA2Duration(), ns3::WifiPhy::GetPhySigBDuration(), ns3::WifiPhy::GetPhyTrainingSymbolDuration(), ns3::WifiTxVector::GetPreambleType(), m_firstPower, ns3::Min(), NS_ASSERT, NS_LOG_DEBUG, NS_LOG_FUNCTION, and visualizer.ipython_view::window.

Referenced by CalculatePayloadSnrPer().

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◆ CalculatePayloadSnrPer()

struct InterferenceHelper::SnrPer ns3::InterferenceHelper::CalculatePayloadSnrPer	(	Ptr< Event >	event,
		std::pair< Time, Time >	relativeMpduStartStop
	)		const

Calculate the SNIR at the start of the payload and accumulate all SNIR changes in the SNIR vector for each MPDU of an A-MPDU.

This workaround is required in order to provide one PER per MPDU, for reception success/failure evaluation, while hiding aggregation details from this class.

Parameters

event	the event corresponding to the first time the corresponding PPDU arrives
relativeMpduStartStop	the time window (pair of start and end times) of PHY payload to focus on

Returns: struct of SNR and PER (with PER being evaluated over the provided time window)

Definition at line 740 of file interference-helper.cc.

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

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

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◆ CalculateSnr() [1/2]

double ns3::InterferenceHelper::CalculateSnr ( Ptr< Event > event ) const

Calculate the SNIR for the event (starting from now until the event end).

Parameters

event the event corresponding to the first time the corresponding PPDU arrives

Returns: the SNR for the PPDU in linear scale

Definition at line 760 of file interference-helper.cc.

References CalculateNoiseInterferenceW().

Referenced by CalculateHtPhyHeaderPer(), CalculateHtPhyHeaderSnrPer(), CalculateNonHtPhyHeaderPer(), CalculateNonHtPhyHeaderSnrPer(), CalculatePayloadPer(), CalculatePayloadSnrPer(), WifiErrorRateModelsTestCaseMimo::DoRun(), ns3::WifiPhy::EndOfMpdu(), and ns3::WifiPhy::EndReceive().

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◆ CalculateSnr() [2/2]

double ns3::InterferenceHelper::CalculateSnr	(	double	signal,
		double	noiseInterference,
		WifiTxVector	txVector
	)		const

protected

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

Parameters

signal	signal power, W
noiseInterference	noise and interference power, W
txVector	the TXVECTOR

Returns: SNR in linear scale

Definition at line 241 of file interference-helper.cc.

References ns3::WifiTxVector::GetChannelWidth(), ns3::WifiTxVector::GetNss(), m_noiseFigure, m_numRxAntennas, NS_LOG_DEBUG, and ns3::RatioToDb().

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◆ EraseEvents()

void ns3::InterferenceHelper::EraseEvents ( void )

Erase all events.

Definition at line 811 of file interference-helper.cc.

References AddNiChangeEvent(), m_firstPower, m_niChanges, and m_rxing.

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

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◆ GetEnergyDuration()

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 199 of file interference-helper.cc.

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

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

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◆ GetErrorRateModel()

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

Return the error rate model.

Returns: Error rate model

Definition at line 187 of file interference-helper.cc.

References m_errorRateModel.

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

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◆ GetNextPosition()

InterferenceHelper::NiChanges::const_iterator ns3::InterferenceHelper::GetNextPosition ( Time moment ) const

private

Returns an iterator to the first NiChange that is later than moment.

Parameters

moment time to check from

Returns: an iterator to the list of NiChanges

Definition at line 821 of file interference-helper.cc.

References m_niChanges.

Referenced by AddNiChangeEvent(), AppendEvent(), and GetPreviousPosition().

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◆ GetPreviousPosition()

InterferenceHelper::NiChanges::const_iterator ns3::InterferenceHelper::GetPreviousPosition ( Time moment ) const

private

Returns an iterator to the first NiChange that is later than moment.

Parameters

moment time to check from

Returns: an iterator to the list of NiChanges Returns an iterator to the last NiChange that is before than moment

Parameters

moment time to check from

Returns: an iterator to the list of NiChanges

Definition at line 827 of file interference-helper.cc.

References GetNextPosition().

Referenced by AppendEvent(), GetEnergyDuration(), and NotifyRxEnd().

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◆ NotifyRxEnd()

void ns3::InterferenceHelper::NotifyRxEnd ( )

Notify that RX has ended.

Definition at line 850 of file interference-helper.cc.

References GetPreviousPosition(), m_firstPower, m_rxing, ns3::Simulator::Now(), and NS_LOG_FUNCTION.

Referenced by ns3::WifiPhy::AbortCurrentReception(), ns3::WifiPhy::EndReceive(), ns3::WifiPhy::ResetReceive(), ns3::WifiPhy::StartReceiveHeader(), and ns3::WifiPhy::StartRx().

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◆ NotifyRxStart()

void ns3::InterferenceHelper::NotifyRxStart ( void )

Notify that RX has started.

Definition at line 843 of file interference-helper.cc.

References m_rxing, and NS_LOG_FUNCTION.

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

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◆ SetErrorRateModel()

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 181 of file interference-helper.cc.

References m_errorRateModel.

Referenced by WifiErrorRateModelsTestCaseMimo::DoRun(), and ns3::WifiPhy::SetErrorRateModel().

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◆ SetNoiseFigure()

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

Set the noise figure.

Parameters

value noise figure in linear scale

Definition at line 175 of file interference-helper.cc.

References m_noiseFigure.

Referenced by WifiErrorRateModelsTestCaseMimo::DoRun(), and ns3::WifiPhy::SetRxNoiseFigure().

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◆ SetNumberOfReceiveAntennas()

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 193 of file interference-helper.cc.

References m_numRxAntennas.

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

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Member Data Documentation

◆ m_errorRateModel

Ptr<ErrorRateModel> ns3::InterferenceHelper::m_errorRateModel

private

error rate model

Definition at line 374 of file interference-helper.h.

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

◆ m_firstPower

double ns3::InterferenceHelper::m_firstPower

private

first power in watts

Definition at line 378 of file interference-helper.h.

Referenced by AppendEvent(), CalculateHtPhyHeaderPer(), CalculateNoiseInterferenceW(), CalculateNonHtPhyHeaderPer(), CalculatePayloadPer(), EraseEvents(), and NotifyRxEnd().

◆ m_niChanges

NiChanges ns3::InterferenceHelper::m_niChanges

private

Experimental: needed for energy duration calculation.

Definition at line 377 of file interference-helper.h.

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

◆ m_noiseFigure

double ns3::InterferenceHelper::m_noiseFigure

private

noise figure (linear)

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

Referenced by CalculateSnr(), and SetNoiseFigure().

◆ m_numRxAntennas

uint8_t ns3::InterferenceHelper::m_numRxAntennas

private

the number of RX antennas in the corresponding receiver

Definition at line 375 of file interference-helper.h.

Referenced by CalculateSnr(), and SetNumberOfReceiveAntennas().

◆ m_rxing

bool ns3::InterferenceHelper::m_rxing

private

flag whether it is in receiving state

Definition at line 379 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

Protected Member Functions

Private Types

Private Member Functions

Private Attributes

Detailed Description

Member Typedef Documentation

◆ NiChanges

Constructor & Destructor Documentation

◆ InterferenceHelper()

◆ ~InterferenceHelper()

Member Function Documentation

◆ Add()

◆ AddForeignSignal()

◆ AddNiChangeEvent()

◆ AppendEvent()

◆ CalculateChunkSuccessRate()

◆ CalculateHtPhyHeaderPer()

◆ CalculateHtPhyHeaderSnrPer()

◆ CalculateNoiseInterferenceW()

◆ CalculateNonHtPhyHeaderPer()

◆ CalculateNonHtPhyHeaderSnrPer()

◆ CalculatePayloadChunkSuccessRate()

◆ CalculatePayloadPer()

◆ CalculatePayloadSnrPer()

◆ CalculateSnr() [1/2]

◆ CalculateSnr() [2/2]

◆ EraseEvents()

◆ GetEnergyDuration()

◆ GetErrorRateModel()

◆ GetNextPosition()

◆ GetPreviousPosition()

◆ NotifyRxEnd()

◆ NotifyRxStart()

◆ SetErrorRateModel()

◆ SetNoiseFigure()

◆ SetNumberOfReceiveAntennas()

Member Data Documentation

◆ m_errorRateModel

◆ m_firstPower

◆ m_niChanges

◆ m_noiseFigure

◆ m_numRxAntennas

◆ m_rxing