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CDMA (Code Division Multiple Access) has altered the face of cellular communication ever since it has debuted in 1995. Its arrival heralded the arrival of highly efficient networks with higher user capacities and better voice quality, among a host of other features. Today, it is a key enabling technology for the transition to not only 3G, but even possibly 4G.

What is CDMA?
Code Division Multiple Access (or CDMA) is a spread spectrum carrier access technique in which the original data signal is spread over a large frequency range, with the help of a pseudo-random spreading signal. This spreading technique imparts CDMA with a great deal of resistance to multipath fading, as the signal occupies the entire bandwidth. This is not the case in TDMA and FDMA technologies, wherein each user signal is allocated a small fragment of the entire bandwidth. CDMA manages to allocate each user with the entire channel bandwidth by using a special code (the pseudo random spreading signal), due to which, to a receiver locked on to one signal, all other signals appear as noise.

CDMA based Wireless Embedded design :
Once the CDMA technologies pre-requisites are met, one will be able to develop Embedded applications on CDMA platform. Be it a TCP/IP protocol stack or some specific protocol. Virtually all applications which can be built on the GSM platform can be built on CDMA .
For further details about CDMA please go to www.cdg.org




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