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CDMA Last modified: Tuesday, September 19, 2006

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. Sponsored listings Telecommunications Training - Telecom, datacom, networking, IP, MPLS, VoIP and wireless training for non-engineers. Seminars, DVD video courses, CBT, textbooks, free tutorials. Connectivity Software for Enterprise and Service Providers - Smith Micro has an unrivaled portfolio of security and network connectivity applications for laptops and mobile devices.

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