About WiFi waveforms???

[lawrence]

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Hi, I am doing a project on how WiFi transmitter can be used as detecting and tracking point. Anyway, the first step is to know what do the 802.11a/b/g standards waveforms like? Is it a sine wave or cosine or something else?

I have been searching for this information for weeks and still have no idea about it except for it's modulation method being OFDM.

So anyone can help?

Many thanks!

[wirelessoceans]

Not always OFDM, sometimes DSSS or FHSS...good luck

[ConnClark]

lawrence,

Almost all radio signals are a sin wave with some form of modulation.

Conn Clark

[ad5mb]

DSSS and FHSS are techniques for spreading the spectrum of RF signals. Not modulation techniques, and independent of modulation.

OFDM is a variation of QPSK, quadrature phase shift keying.

A noso hotso image of QPSK modulation as used in wifi:

http://www.entegra.co.uk/WiFi_802-11b.htm