This class defines all functions to create a spectrum model for Wi-Fi based on a a spectral model aligned with an OFDM subcarrier spacing of 312.5 KHz (model also reused for DSSS modulations) More...

#include "wifi-spectrum-value-helper.h"

Public Member Functions
virtual	~WifiSpectrumValueHelper ()=default
	Destructor. More...

Static Public Member Functions
static Ptr< SpectrumValue >	CreateDsssTxPowerSpectralDensity (uint32_t centerFrequency, double txPowerW, uint16_t guardBandwidth)
	Create a transmit power spectral density corresponding to DSSS. More...

static Ptr< SpectrumValue >	CreateDuplicated20MhzTxPowerSpectralDensity (uint32_t centerFrequency, uint16_t channelWidth, double txPowerW, uint16_t guardBandwidth, double minInnerBandDbr=-20, double minOuterbandDbr=-28, double lowestPointDbr=-40, const std::vector< bool > &puncturedSubchannels=std::vector< bool >{})
	Create a transmit power spectral density corresponding to OFDM duplicated over multiple 20 MHz subchannels. More...

static Ptr< SpectrumValue >	CreateHeMuOfdmTxPowerSpectralDensity (uint32_t centerFrequency, uint16_t channelWidth, double txPowerW, uint16_t guardBandwidth, const WifiSpectrumBandIndices &ru)
	Create a transmit power spectral density corresponding to the OFDMA part of HE TB PPDUs for a given RU. More...

static Ptr< SpectrumValue >	CreateHeOfdmTxPowerSpectralDensity (uint32_t centerFrequency, uint16_t channelWidth, double txPowerW, uint16_t guardBandwidth, double minInnerBandDbr=-20, double minOuterbandDbr=-28, double lowestPointDbr=-40, const std::vector< bool > &puncturedSubchannels=std::vector< bool >{})
	Create a transmit power spectral density corresponding to OFDM High Efficiency (HE) (802.11ax). More...

static Ptr< SpectrumValue >	CreateHtOfdmTxPowerSpectralDensity (uint32_t centerFrequency, uint16_t channelWidth, double txPowerW, uint16_t guardBandwidth, double minInnerBandDbr=-20, double minOuterbandDbr=-28, double lowestPointDbr=-40)
	Create a transmit power spectral density corresponding to OFDM High Throughput (HT) (802.11n/ac). More...

static Ptr< SpectrumValue >	CreateNoisePowerSpectralDensity (double noiseFigure, Ptr< SpectrumModel > spectrumModel)
	Create a thermal noise power spectral density. More...

static Ptr< SpectrumValue >	CreateNoisePowerSpectralDensity (uint32_t centerFrequency, uint16_t channelWidth, uint32_t carrierSpacing, double noiseFigure, uint16_t guardBandwidth)
	Create a power spectral density corresponding to the noise. More...

static Ptr< SpectrumValue >	CreateOfdmTxPowerSpectralDensity (uint32_t centerFrequency, uint16_t channelWidth, double txPowerW, uint16_t guardBandwidth, double minInnerBandDbr=-20, double minOuterbandDbr=-28, double lowestPointDbr=-40)
	Create a transmit power spectral density corresponding to OFDM (802.11a/g). More...

static void	CreateSpectrumMaskForOfdm (Ptr< SpectrumValue > c, const std::vector< WifiSpectrumBandIndices > &allocatedSubBands, const WifiSpectrumBandIndices &maskBand, double txPowerPerBandW, uint32_t nGuardBands, uint32_t innerSlopeWidth, double minInnerBandDbr, double minOuterbandDbr, double lowestPointDbr, const std::vector< WifiSpectrumBandIndices > &puncturedSubBands=std::vector< WifiSpectrumBandIndices >{}, uint32_t puncturedSlopeWidth=0)
	Create a transmit power spectral density corresponding to OFDM transmit spectrum mask requirements for 11a/11g/11n/11ac/11ax Channel width may vary between 5, 10, 20, 40, 80, and 160 MHz. More...

static double	DbmToW (double dbm)
	Convert from dBm to Watts. More...

static double	GetBandPowerW (Ptr< SpectrumValue > psd, const WifiSpectrumBandIndices &band)
	Calculate the power of the specified band composed of uniformly-sized sub-bands. More...

static Ptr< SpectrumModel >	GetSpectrumModel (uint32_t centerFrequency, uint16_t channelWidth, uint32_t carrierSpacing, uint16_t guardBandwidth)
	Return a SpectrumModel instance corresponding to the center frequency and channel width. More...

static void	NormalizeSpectrumMask (Ptr< SpectrumValue > c, double txPowerW)
	Normalize the transmit spectrum mask generated by CreateSpectrumMaskForOfdm so that the total transmitted power corresponds to the input value. More...

Detailed Description

This class defines all functions to create a spectrum model for Wi-Fi based on a a spectral model aligned with an OFDM subcarrier spacing of 312.5 KHz (model also reused for DSSS modulations)

Definition at line 42 of file wifi-spectrum-value-helper.h.

Constructor & Destructor Documentation

◆ ~WifiSpectrumValueHelper()

virtual ns3::WifiSpectrumValueHelper::~WifiSpectrumValueHelper ( )

virtualdefault

Destructor.

Member Function Documentation

◆ CreateDsssTxPowerSpectralDensity()

Ptr< SpectrumValue > ns3::WifiSpectrumValueHelper::CreateDsssTxPowerSpectralDensity	(	uint32_t	centerFrequency,
		double	txPowerW,
		uint16_t	guardBandwidth
	)

static

Create a transmit power spectral density corresponding to DSSS.

The center frequency typically corresponds to 802.11b channel center frequencies but is not restricted to those frequencies.

Note: There is no channel width parameter; this method assumes 22 MHz

Parameters

centerFrequency	center frequency (MHz)
txPowerW	transmit power (W) to allocate
guardBandwidth	width of the guard band (MHz)

Returns: a pointer to a newly allocated SpectrumValue representing the DSSS Transmit Power Spectral Density in W/Hz

Definition at line 127 of file wifi-spectrum-value-helper.cc.

References ns3::SpectrumValue::ConstBandsBegin(), ns3::SpectrumModel::GetNumBands(), ns3::SpectrumValue::GetSpectrumModel(), GetSpectrumModel(), NS_ASSERT, NS_LOG_FUNCTION, and ns3::SpectrumValue::ValuesBegin().

Referenced by ns3::DsssPhy::GetTxPowerSpectralDensity().

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◆ CreateDuplicated20MhzTxPowerSpectralDensity()

Ptr< SpectrumValue > ns3::WifiSpectrumValueHelper::CreateDuplicated20MhzTxPowerSpectralDensity	(	uint32_t	centerFrequency,
		uint16_t	channelWidth,
		double	txPowerW,
		uint16_t	guardBandwidth,
		double	minInnerBandDbr = `-20`,
		double	minOuterbandDbr = `-28`,
		double	lowestPointDbr = `-40`,
		const std::vector< bool > &	puncturedSubchannels = `std::vector<bool>{}`
	)

static

Create a transmit power spectral density corresponding to OFDM duplicated over multiple 20 MHz subchannels.

Channel width may vary between 20, 40, 80, and 160 MHz.

Parameters

centerFrequency	center frequency (MHz)
channelWidth	channel width (MHz)
txPowerW	transmit power (W) to allocate
guardBandwidth	width of the guard band (MHz)
minInnerBandDbr	the minimum relative power in the inner band (in dBr)
minOuterbandDbr	the minimum relative power in the outer band (in dBr)
lowestPointDbr	maximum relative power of the outermost subcarriers of the guard band (in dBr)
puncturedSubchannels	bitmap indicating whether a 20 MHz subchannel is punctured or not

Returns: a pointer to a newly allocated SpectrumValue representing the duplicated 20 MHz OFDM Transmit Power Spectral Density in W/Hz for each Band

Definition at line 225 of file wifi-spectrum-value-helper.cc.

References CreateSpectrumMaskForOfdm(), ns3::SpectrumModel::GetNumBands(), ns3::SpectrumValue::GetSpectrumModel(), GetSpectrumModel(), ns3::Integral(), NormalizeSpectrumMask(), NS_ASSERT, NS_ASSERT_MSG, NS_LOG_DEBUG, NS_LOG_FUNCTION, two-ray-to-three-gpp-ch-calibration::start, and two-ray-to-three-gpp-ch-calibration::stop.

Referenced by ns3::OfdmPhy::GetTxPowerSpectralDensity(), and ns3::HePhy::GetTxPowerSpectralDensity().

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◆ CreateHeMuOfdmTxPowerSpectralDensity()

Ptr< SpectrumValue > ns3::WifiSpectrumValueHelper::CreateHeMuOfdmTxPowerSpectralDensity	(	uint32_t	centerFrequency,
		uint16_t	channelWidth,
		double	txPowerW,
		uint16_t	guardBandwidth,
		const WifiSpectrumBandIndices &	ru
	)

static

Create a transmit power spectral density corresponding to the OFDMA part of HE TB PPDUs for a given RU.

An ideal (i.e. rectangular) spectral mask is considered for the time being.

Parameters

centerFrequency	center frequency (MHz)
channelWidth	channel width (MHz)
txPowerW	transmit power (W) to allocate
guardBandwidth	width of the guard band (MHz)
ru	the RU band used by the STA

Returns: a pointer to a newly allocated SpectrumValue representing the HE OFDM Transmit Power Spectral Density on the RU used by the STA in W/Hz for each Band

Definition at line 500 of file wifi-spectrum-value-helper.cc.

References ns3::SpectrumValue::ConstBandsBegin(), ns3::SpectrumModel::GetNumBands(), ns3::SpectrumValue::GetSpectrumModel(), GetSpectrumModel(), NS_LOG_FUNCTION, and ns3::SpectrumValue::ValuesBegin().

Referenced by ns3::HePhy::GetTxPowerSpectralDensity().

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◆ CreateHeOfdmTxPowerSpectralDensity()

Ptr< SpectrumValue > ns3::WifiSpectrumValueHelper::CreateHeOfdmTxPowerSpectralDensity	(	uint32_t	centerFrequency,
		uint16_t	channelWidth,
		double	txPowerW,
		uint16_t	guardBandwidth,
		double	minInnerBandDbr = `-20`,
		double	minOuterbandDbr = `-28`,
		double	lowestPointDbr = `-40`,
		const std::vector< bool > &	puncturedSubchannels = `std::vector<bool>{}`
	)

static

Create a transmit power spectral density corresponding to OFDM High Efficiency (HE) (802.11ax).

Channel width may vary between 20, 40, 80, and 160 MHz.

Parameters

centerFrequency	center frequency (MHz)
channelWidth	channel width (MHz)
txPowerW	transmit power (W) to allocate
guardBandwidth	width of the guard band (MHz)
minInnerBandDbr	the minimum relative power in the inner band (in dBr)
minOuterbandDbr	the minimum relative power in the outer band (in dBr)
lowestPointDbr	maximum relative power of the outermost subcarriers of the guard band (in dBr)
puncturedSubchannels	bitmap indicating whether a 20 MHz subchannel is punctured or not

Returns: a pointer to a newly allocated SpectrumValue representing the HE OFDM Transmit Power Spectral Density in W/Hz for each Band

Definition at line 366 of file wifi-spectrum-value-helper.cc.

References CreateSpectrumMaskForOfdm(), ns3::SpectrumModel::GetNumBands(), ns3::SpectrumValue::GetSpectrumModel(), GetSpectrumModel(), ns3::Integral(), NormalizeSpectrumMask(), NS_ASSERT_MSG, NS_FATAL_ERROR, NS_LOG_FUNCTION, two-ray-to-three-gpp-ch-calibration::start, and two-ray-to-three-gpp-ch-calibration::stop.

Referenced by ns3::HePhy::GetTxPowerSpectralDensity().

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◆ CreateHtOfdmTxPowerSpectralDensity()

Ptr< SpectrumValue > ns3::WifiSpectrumValueHelper::CreateHtOfdmTxPowerSpectralDensity	(	uint32_t	centerFrequency,
		uint16_t	channelWidth,
		double	txPowerW,
		uint16_t	guardBandwidth,
		double	minInnerBandDbr = `-20`,
		double	minOuterbandDbr = `-28`,
		double	lowestPointDbr = `-40`
	)

static

Create a transmit power spectral density corresponding to OFDM High Throughput (HT) (802.11n/ac).

Channel width may vary between 20, 40, 80, and 160 MHz.

Parameters

centerFrequency	center frequency (MHz)
channelWidth	channel width (MHz)
txPowerW	transmit power (W) to allocate
guardBandwidth	width of the guard band (MHz)
minInnerBandDbr	the minimum relative power in the inner band (in dBr)
minOuterbandDbr	the minimum relative power in the outer band (in dBr)
lowestPointDbr	maximum relative power of the outermost subcarriers of the guard band (in dBr)

Returns: a pointer to a newly allocated SpectrumValue representing the HT OFDM Transmit Power Spectral Density in W/Hz for each Band

Definition at line 301 of file wifi-spectrum-value-helper.cc.

References CreateSpectrumMaskForOfdm(), ns3::SpectrumModel::GetNumBands(), ns3::SpectrumValue::GetSpectrumModel(), GetSpectrumModel(), ns3::Integral(), NormalizeSpectrumMask(), NS_ASSERT_MSG, NS_LOG_DEBUG, NS_LOG_FUNCTION, two-ray-to-three-gpp-ch-calibration::start, and two-ray-to-three-gpp-ch-calibration::stop.

Referenced by ns3::HtPhy::GetTxPowerSpectralDensity().

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◆ CreateNoisePowerSpectralDensity() [1/2]

Ptr< SpectrumValue > ns3::WifiSpectrumValueHelper::CreateNoisePowerSpectralDensity	(	double	noiseFigure,
		Ptr< SpectrumModel >	spectrumModel
	)

static

Create a thermal noise power spectral density.

Parameters

noiseFigure	the noise figure
spectrumModel	the spectrum model

Returns: a pointer to a newly allocated SpectrumValue representing the noise Power Spectral Density in W/Hz corresponding to thermal noise, for each Band

Definition at line 545 of file wifi-spectrum-value-helper.cc.

References DbmToW(), ns3::Integral(), NS_LOG_FUNCTION, and NS_LOG_INFO.

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◆ CreateNoisePowerSpectralDensity() [2/2]

Ptr< SpectrumValue > ns3::WifiSpectrumValueHelper::CreateNoisePowerSpectralDensity	(	uint32_t	centerFrequency,
		uint16_t	channelWidth,
		uint32_t	carrierSpacing,
		double	noiseFigure,
		uint16_t	guardBandwidth
	)

static

Create a power spectral density corresponding to the noise.

Parameters

centerFrequency	center frequency (MHz)
channelWidth	channel width (MHz)
carrierSpacing	carrier spacing (Hz)
noiseFigure	the noise figure in dB w.r.t. a reference temperature of 290K
guardBandwidth	width of the guard band (MHz)

Returns: a pointer to a newly allocated SpectrumValue representing the noise Power Spectral Density in W/Hz for each Band

Definition at line 533 of file wifi-spectrum-value-helper.cc.

References GetSpectrumModel().

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◆ CreateOfdmTxPowerSpectralDensity()

Ptr< SpectrumValue > ns3::WifiSpectrumValueHelper::CreateOfdmTxPowerSpectralDensity	(	uint32_t	centerFrequency,
		uint16_t	channelWidth,
		double	txPowerW,
		uint16_t	guardBandwidth,
		double	minInnerBandDbr = `-20`,
		double	minOuterbandDbr = `-28`,
		double	lowestPointDbr = `-40`
	)

static

Create a transmit power spectral density corresponding to OFDM (802.11a/g).

Channel width may vary between 20, 10, and 5 MHz. Guard bandwidth also typically varies with channel width.

Parameters

centerFrequency	center frequency (MHz)
channelWidth	channel width (MHz)
txPowerW	transmit power (W) to allocate
guardBandwidth	width of the guard band (MHz)
minInnerBandDbr	the minimum relative power in the inner band (in dBr)
minOuterbandDbr	the minimum relative power in the outer band (in dBr)
lowestPointDbr	maximum relative power of the outermost subcarriers of the guard band (in dBr)

Returns: a pointer to a newly allocated SpectrumValue representing the OFDM Transmit Power Spectral Density in W/Hz for each Band

Definition at line 154 of file wifi-spectrum-value-helper.cc.

References CreateSpectrumMaskForOfdm(), ns3::SpectrumModel::GetNumBands(), ns3::SpectrumValue::GetSpectrumModel(), GetSpectrumModel(), ns3::Integral(), NormalizeSpectrumMask(), NS_ASSERT_MSG, NS_FATAL_ERROR, NS_LOG_DEBUG, and NS_LOG_FUNCTION.

Referenced by ns3::OfdmPhy::GetTxPowerSpectralDensity().

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◆ CreateSpectrumMaskForOfdm()

void ns3::WifiSpectrumValueHelper::CreateSpectrumMaskForOfdm	(	Ptr< SpectrumValue >	c,
		const std::vector< WifiSpectrumBandIndices > &	allocatedSubBands,
		const WifiSpectrumBandIndices &	maskBand,
		double	txPowerPerBandW,
		uint32_t	nGuardBands,
		uint32_t	innerSlopeWidth,
		double	minInnerBandDbr,
		double	minOuterbandDbr,
		double	lowestPointDbr,
		const std::vector< WifiSpectrumBandIndices > &	puncturedSubBands = `std::vector<WifiSpectrumBandIndices>{}`,
		uint32_t	puncturedSlopeWidth = `0`
	)

static

Create a transmit power spectral density corresponding to OFDM transmit spectrum mask requirements for 11a/11g/11n/11ac/11ax Channel width may vary between 5, 10, 20, 40, 80, and 160 MHz.

The default (standard) values are illustrated below.

[ guard band ][ channel width ][ guard band ] __________ __________ _ 0 dBr / | | \ / |_| \ _ -20 dBr . ' ' . . ' ' . _ -28 dBr .' '. .' '. .' '. _ lowest point

|--—| |--—| outerBand left/right |---—| |– —| middle band left/right |-| |-| inner band left/right |--------------------—| allocated sub-bands |--------------------------------------------------—| mask band

Please take note that, since guard tones are within the allocated band while not being ideally allocated any power, the inner band had to be shifted inwards and a flat junction band (at -20 dBr) had to be added between the inner and the middle bands.

Parameters

c	spectrumValue to allocate according to transmit power spectral density mask (in W/Hz for each band)
allocatedSubBands	vector of start and stop subcarrier indexes of the allocated sub bands
maskBand	start and stop subcarrier indexes of transmit mask (in case signal doesn't cover whole SpectrumModel)
txPowerPerBandW	power allocated to each subcarrier in the allocated sub bands
nGuardBands	size (in number of subcarriers) of the guard band (left and right)
innerSlopeWidth	size (in number of subcarriers) of the inner band (i.e. slope going from 0 dBr to -20 dBr in the figure above)
minInnerBandDbr	the minimum relative power in the inner band (i.e., -20 dBr in the figure above)
minOuterbandDbr	the minimum relative power in the outer band (i.e., -28 dBr in the figure above)
lowestPointDbr	maximum relative power of the outermost subcarriers of the guard band (in dBr)
puncturedSubBands	vector of start and stop subcarrier indexes of the punctured sub bands
puncturedSlopeWidth	size (in number of subcarriers) of the punctured band slope

Definition at line 564 of file wifi-spectrum-value-helper.cc.

References ns3::SpectrumValue::ConstBandsBegin(), DbmToW(), ns3::SpectrumModel::GetNumBands(), ns3::SpectrumValue::GetSpectrumModel(), max, min, NS_ASSERT, NS_FATAL_ERROR, NS_LOG_DEBUG, NS_LOG_FUNCTION, NS_LOG_INFO, NS_LOG_LOGIC, and ns3::SpectrumValue::ValuesBegin().

Referenced by CreateDuplicated20MhzTxPowerSpectralDensity(), CreateHeOfdmTxPowerSpectralDensity(), CreateHtOfdmTxPowerSpectralDensity(), and CreateOfdmTxPowerSpectralDensity().

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◆ DbmToW()

double ns3::WifiSpectrumValueHelper::DbmToW ( double dbm )

static

Convert from dBm to Watts.

Taken from wifi-utils since the original method couldn't be called from here due to resulting circular dependencies of spectrum and wifi modules.

Parameters

dbm	the power in dBm

Returns: the equivalent Watts for the given dBm

Definition at line 785 of file wifi-spectrum-value-helper.cc.

Referenced by CreateNoisePowerSpectralDensity(), and CreateSpectrumMaskForOfdm().

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◆ GetBandPowerW()

double ns3::WifiSpectrumValueHelper::GetBandPowerW	(	Ptr< SpectrumValue >	psd,
		const WifiSpectrumBandIndices &	band
	)

static

Calculate the power of the specified band composed of uniformly-sized sub-bands.

Parameters

psd	received Power Spectral Density in W/Hz
band	a pair of start and stop indexes that defines the band

Returns: band power in W

Definition at line 791 of file wifi-spectrum-value-helper.cc.

References ns3::SpectrumValue::ConstBandsBegin(), and ns3::SpectrumValue::ConstValuesBegin().

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

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◆ GetSpectrumModel()

Ptr< SpectrumModel > ns3::WifiSpectrumValueHelper::GetSpectrumModel	(	uint32_t	centerFrequency,
		uint16_t	channelWidth,
		uint32_t	carrierSpacing,
		uint16_t	guardBandwidth
	)