Valid HE TB PHY configuration in response to triggering frame containing TRS Control subfield



cfgTRS = getTRSConfiguration(cfgHETB) generates cfgTRS, a valid PHY configuration for the IEEE® 802.11™ high-efficiency trigger-based (HE TB) packet format. The function sets properties of cfgTRS by changing a subset of the properties of input PHY configuration cfgHETB. You can parameterize an HE TB uplink PPDU transmitted in response to a frame containing a triggered response scheduling (TRS) Control subfield by using the cfgTRS output. For a detailed description of the HE WLAN formats, see [1].


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Configure and generate a WLAN HE TB waveform to be transmitted in response to a frame containing a TRS Control subfield.

Create an HE TB configuration object, specifying the triggering frame type.

cfgHETB = wlanHETBConfig('TriggerMethod','TRS');

Generate a valid configuration by using the getTRSConfiguration object function, displaying the result.

cfgTRS = getTRSConfiguration(cfgHETB)
cfgTRS = 
  wlanHETBConfig with properties:

              TriggerMethod: 'TRS'
           ChannelBandwidth: 'CBW20'
                     RUSize: 242
                    RUIndex: 1
    PreHEPowerScalingFactor: 1
        NumTransmitAntennas: 1
        NumSpaceTimeStreams: 1
    StartingSpaceTimeStream: 1
             SpatialMapping: 'Direct'
                       STBC: 0
                        MCS: 0
                        DCM: 0
              ChannelCoding: 'BCC'
        PreFECPaddingFactor: 4
             NumDataSymbols: 10
          DefaultPEDuration: 0
              GuardInterval: 3.2000
                  HELTFType: 4
            NumHELTFSymbols: 1
         SingleStreamPilots: 1
                   BSSColor: 0
              SpatialReuse1: 15
              SpatialReuse2: 15
              SpatialReuse3: 15
              SpatialReuse4: 15
               TXOPDuration: 127
                HighDoppler: 0
         HESIGAReservedBits: [9x1 double]

Get the PSDU length in bytes and generate a PSDU for transmission.

psduLength = getPSDULength(cfgTRS);
psdu = randi([0 1],8*psduLength,1);

Generate and plot the waveform.

waveform = wlanWaveformGenerator(psdu,cfgTRS);
title('HE TB Waveform');
xlabel('Time (nanoseconds)');

Input Arguments

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HE TB PHY configuration, specified as a wlanHETBConfig object.

Output Arguments

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Valid HE TB PHY configuration, returned as a wlanHETBConfig object. The getTRSConfiguration function sets property values such that this object can parameterize an HE TB uplink PPDU in response to a frame containing a TRS Control subfield.

More About

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The physical layer convergence procedure (PLCP) protocol data unit (PPDU) is the complete PLCP frame, including PLCP headers, MAC headers, the MAC data field, and the MAC and PLCP trailers.


[1] IEEE P802.11ax™/D4.1. “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications. Amendment 1: Enhancements for High Efficiency WLAN.” Draft Standard for Information technology — Telecommunications and information exchange between systems. Local and metropolitan area networks — Specific requirements.

Extended Capabilities

C/C++ Code Generation
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See Also


Introduced in R2020a