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Term:
Code Division Multiple Access   CDMA

Definition:

There are two basic types of CDMA-Code Division Multiple Access used in Wi-Fi-Wireless Fidelity or 802.11. Each Wi-Fi system uses the same set of frequencies in the 83.5 MHz of available frequencies available in the 2.4 GHz band. That is, the IEEE 802.11b standard defines 11 possible channels (frequencies bands) available for use numbered 1-11 as shown here. The use of separate channels spreaded across a frequency range or band is called DSSS-Direct Sequence Spread Spectrum. To reduce interference in WiFi as well as in cellular wireless, FHSS-Frequency Hopping Spread Spectrum is used. Called "Frequency Agile," FHSS devices hop (change) over at least 75 different channels (frequencies) and limit the maximum bandwidth of each hopping channel to 1 MHz. Bluetooth devices hop over 79 frequencies with transmission packet-bursts of only 625 microseconds.



Reference to:
AirWalk Gets 2009 3G CDMA Industry Achievement Award
11/23/2009

Mobile wireless router from Zyxel competes with Mi-Fi
11/22/2009

Samsung Mobile to Release 3G UbiCell Personal CDMA Base Station
11/22/2009

Saygus Releases Two-Way Video Calling Android Phone
11/22/2009

PacketVideo Mobile Multimedia Software Ships 100th NTT Docomo Handset
11/22/2009




Source:

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