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CDMA
3G
cellular
GSM
multiplex
PCS
TDM
TDMA

Short for Code-Division Multiple Access, a digital cellular technology that uses spread-spectrum techniques. Unlike competing systems, such as GSM, that use time-division multiplexing (TDM), CDMA does not assign a specific frequency to each user. Instead, every channel uses the full available spectrum. Individual conversations are encoded with a pseudo-random digital sequence.

CDMA is a military technology first used during World War II by the English allies to foil German attempts at jamming transmissions. The allies decided to transmit over several frequencies, instead of one, making it difficult for the Germans to pick up the complete signal.

Because Qualcomm Inc. created communications chips for CDMA technology, it was privvy to the classified information. Once the information became public, Qualcomm claimed patents on the technology and became the first to commercialize it.



For internet.com pages about CDMA, . Also, check out the following links!


More Information

Outstanding Page Birth of CDMA
Learn how war, sex and music played leading roles in the developement of CDMA spread spectrum.

Outstanding Page The CDMA Development Group
Home page of the CDG (CDMA Development Group), an industry consortium of companies developing CDMA products and services. Here you'll find background information about CDMA as well as updated news stories. Updated on Dec 6, 1997

  Qualcomm home page
Qualcomm, Inc. developed the CDMA technology and is one of the leading providers of CDMA products. Its web site provides corporate information as well as data about CDMA and CDMA products. Updated on Jul 31, 1998

  Wireless Design Online
Excellent resource for those involved in the design and development of wireless communications systems and equipment. Includes news items, a Web resource center, discussion forums, and buyer's guides.

  Yahoo!'s CDMA page
Yahoo!'s directory of CDMA.

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