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CDMA
Last modified: Monday, April 04, 2005 

Short for Code-Division Multiple Access, a digital cellular technology that uses spread-spectrum techniques. Unlike competing systems, such as GSM, that use TDMA, 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 consistently provides better capacity for voice and data communications than other commercial mobile technologies, allowing more subscribers to connect at any given time, and it is the common platform on which 3G technologies are built.

CDMA is a military technology first used during World War II by 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 created communications chips for CDMA technology, it was privy to the classified information. Once the information became public, Qualcomm claimed patents on the technology and became the first to commercialize it.

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Aeroflex Inc.:CDMA 1x EVDO - Develops and manufactures test and measurement and microelectronic solutions for the aerospace, defense and broadband communications markets.

Hoover's: QUALCOMM CDMA Technologies Company Research - Find information on QUALCOMM CDMA Technologies with operations and products, financials, officers, competitors and more at Hoover's.


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

Related Links

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.

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.

The CDMA Revolution
Technical overview of CDMA and how it differs from TDMA-based systems.

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.

related categories

Convergence

Wireless Computing

related terms

3G

802.11

ADM

BREW

BSC

BTS

cellular

demultiplex

EDGE

Enhanced Message Service

ESN

GSM

multiplex

PCS

TDM

TDMA

WCDMA


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