Signal Reception

Functions for 802.11™ physical layer reception processing

WLAN Toolbox™ provides functions that synchronize, demodulate, and decode 802.11 waveforms. Use these functions to detect waveform characteristics, estimate and correct for symbol timing offset, estimate and correct for carrier frequency offset, and estimate the channel. The functions also demodulate and recover individual preamble and data fields.

Functions

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Waveform Detection and Synchronization

`wlanPacketDetect`	Estimate timing offset of OFDM packet
`wlanFormatDetect`	Detect packet format
`wlanSymbolTimingEstimate`	Fine symbol timing estimate using L-LTF
`wlanCoarseCFOEstimate`	Perform coarse CFO estimation
`wlanFineCFOEstimate`	Perform fine CFO estimation
`wlanSampleRate`	Nominal sample rate
`wlanEHTTrackPilotError`	Track errors using pilot subcarriers of EHT waveform
`wlanHETrackPilotError`	Track errors using pilot subcarriers of HE waveform
`channelDelay`	Channel timing delay
`frequencyOffset`	Apply frequency offset to input signal

Channel and Noise Estimation

`wlanEHTLTFChannelEstimate`	Channel estimation using EHT-LTF
`wlanHELTFChannelEstimate`	Channel estimation using HE-LTF
`wlanVHTLTFChannelEstimate`	Channel estimation using VHT-LTF
`wlanHTLTFChannelEstimate`	Channel estimation using HT-LTF
`wlanLLTFChannelEstimate`	Channel estimation using L-LTF
`wlanPreHEChannelEstimate`	Channel estimation using pre-HE fields
`wlanLLTFNoiseEstimate`	Noise estimation using L-LTF and S1G-LTF1

OFDM Demodulation

`wlanFieldIndices`	Generate PPDU field indices
`wlanEHTDemodulate`	Demodulate fields of EHT waveform
`wlanHEDemodulate`	Demodulate fields of HE waveform
`wlanDMGOFDMDemodulate`	Demodulate fields of DMG waveform
`wlanS1GDemodulate`	Demodulate fields of S1G waveform
`wlanVHTLTFDemodulate`	Demodulate VHT-LTF waveform
`wlanHTLTFDemodulate`	Demodulate HT-LTF waveform
`wlanLLTFDemodulate`	Demodulate L-LTF waveform
`wlanNonHTOFDMDemodulate`	Demodulate fields of non-HT OFDM waveform
`wlanEHTOFDMInfo`	OFDM information for EHT transmission
`wlanHEOFDMInfo`	OFDM information for HE transmission
`wlanDMGOFDMInfo`	OFDM information for DMG transmission
`wlanS1GOFDMInfo`	OFDM Information for S1G transmission
`wlanVHTOFDMInfo`	OFDM information for VHT transmission
`wlanHTOFDMInfo`	OFDM information for HT transmission
`wlanNonHTOFDMInfo`	OFDM information for non-HT transmission

Signaling and Header Field Processing

`wlanFieldIndices`	Generate PPDU field indices
`wlanHESIGABitRecover`	Recover information bits in HE-SIG-A field
`wlanHESIGBCommonBitRecover`	Recover common field bits in HE-SIG-B field
`wlanHESIGBUserBitRecover`	Recover user field bits in HE-SIG-B field
`wlanHETBNDPFeedbackStatus`	Recover feedback status from HE TB feedback NDP
`wlanLSIGBitRecover`	Recover information bits in L-SIG field
`wlanLSIGRecover`	Recover L-SIG information bits
`wlanVHTSIGARecover`	Recover VHT-SIG-A information bits
`wlanVHTSIGBRecover`	Recover VHT-SIG-B information bits
`wlanHTSIGRecover`	Recover HT-SIG information bits
`wlanDMGHeaderBitRecover`	Recover bits from DMG Header field

Data Field Processing

`wlanFieldIndices`	Generate PPDU field indices
`wlanInterpretScramblerState`	Recover bandwidth signaling from initial scrambler state
`wlanEHTDataBitRecover`	Recover bits from EHT-Data field
`wlanHEDataBitRecover`	Recover bits from HE-Data field
`wlanVHTDataRecover`	Recover bits from VHT-Data field
`wlanHTDataRecover`	Recover bits from HT-Data field
`wlanNonHTDataBitRecover`	Recover PSDU from non-HT Data field
`wlanNonHTDataRecover`	Recover non-HT Data
`wlanDMGDataBitRecover`	Recover bits from DMG Data field

Bit-Level Processing

`wlanScramble`	Scramble and descramble binary input sequence
`scramblerRange`	Get scrambler initialization range
`wlanConstellationDemap`	Constellation demapping
`wlanBCCDeinterleave`	Deinterleave binary convolutionally interleaved input
`wlanStreamDeparse`	Stream-deparse spatial streams
`wlanSegmentDeparseBits`	Segment-deparse data bits
`wlanSegmentParseSymbols`	Segment-parse data subcarriers
`wlanBCCDecode`	Convolutionally decode input data
`wlanGolaySequence`	Generate Golay sequence

Objects

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Waveform Detection and Synchronization

comm.PhaseFrequencyOffset Apply phase and frequency offsets to input signal

Signaling and Header Field Processing

wlanHERecoveryConfig Store parameters recovered from HE transmission

Topics

Basic VHT Data Recovery
Perform basic VHT data recovery.
End-to-End VHT Simulation with Frequency Correction
Generate, transmit, recover, and view a VHT MIMO waveform.
Transmit and Recover L-SIG, VHT-SIG-A, VHT-SIG-B in Fading Channel
Transmit a VHT waveform through a noisy MIMO channel.

Featured Examples

Recover and Analyze Packets in 802.11 Waveform

Blindly detect, decode, and analyze IEEE^® 802.11 packets in a waveform.

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Recovery Procedure for an 802.11ax Packet

Detect a packet and decode payload bits in an IEEE 802.11ax™ waveform.

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802.11ax Feedback Status Misdetection Simulation for Uplink Trigger-Based Feedback NDP

Measure the probability of misdetecting feedback status information in an IEEE 802.11ax HE TB feedback NDP transmission.

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802.11ac Multi-User MIMO Precoding

Perform transmit and receive processing for an IEEE 802.11ac™ multi-user downlink transmission over a fading channel.

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Recovery Procedure for an 802.11ac Packet

Detect a packet and decode payload bits in an IEEE 802.11ac waveform.

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OFDM Beacon Receiver Using Software-Defined Radio

Retrieve information about WiFi networks on the 5 GHz band using a software-defined radio.

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Joint Sampling Clock and Carrier Frequency Offset Tracking

Measure and correct offset of sampling rate and carrier frequency in a WLAN receiver.

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Detect Human Presence Using WLAN Signals and Deep Learning

Use a convolutional neural network to detect human presence by using the channel state information in wireless local area networks.

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