Utah Education and Telemedicine Network

Tech Summit 2021

802.11 Traffic

802.11 data frame size

Spectral Mask: DSSS & HR/DSSS

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• Transmit Spectrum Mask - IEEE defined signal requirements for a specific transmit technology. • Frequency width at which signal power must decrease by a certain amount • Minimizes interference with adjacent transmitters and frequency bands.

0 dBr

-30 dBr

-50 dBr

fc-22 MHz fc-11 MHz fc fc+11 MHz fc+22 MHz

Transmit Spectrum Mask

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Spectral Mask: OFDM

OFDM Transmissions

OFDMA Transmissions

20 MHz / 64 = 312.5 KHz

20 MHz / 256 = 78.125 KHz

OFDMA Resource Units

RU Index – 20 MHz

Trigger frame RU allocation

Downlink OFDMA

Uplink OFDMA

Design Considerations

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