Wireless Internet Modulation?

Hi all,
I just wonder what kind of modulation they used for wireless internet communication at 2.4Ghz or 5GHz.
Any one have a good e-book or link for this topics? Pls share.

Thx in advance

Tr2000

wireless communication ,but why internet ?

do U mean 802.11a & b ?

U can search in by google with key word...

Hi,

the best thing is to look for out IEEE 802.11 standards.

802.11, uses Frequency Hopping Spread Spectrum

802.11b uses Direct Squence Spread Spectrum

802.11a operates at 2.4 & 5 GHz and use Orthogonal Frequency Division Multiplexing.

Hope it helps.

Element7k

The most of the commercial radiomodems uses the phase-shift keying signal. Some of 5.2 GHz modems uses the amplitude modulation of signal.

Best regards,
Kit-the-great

Hi,

Any clue, link or e-book about this, pls

Rgds,
TR2000

www.Intersil.com

a company who turn out 802.11 chip.

A PDF I DL before:

maybe is useful 2 U.

Hi johan_tr2000,

Take the following app. notes from the @gilent site:

Application Note 1380-1 (RF Testing of Wireless LAN Products)
Application Note 1380-2 (IEEE 802.11 Wireless LAN PHY Layer (RF) Operation and Measurement)

Rgds,

harlan1