Full Form of CDMA :
Code Division Multiple Access
CDMA Full Form is Code Division Multiple Access. It is a digital technology of cellular systems, which uses the techniques of spread spectrum. CDMA does not employ specific frequency to every user and hence is different from GSM. In simple terms, CDMA is a method of channel access and is used by several radio communication technologies. CDMA is a typical example for multiple accesses. In this technique, many transmitters send simultaneous information over one communication channel. This enables many users to share the same band of frequencies or bandwidth at the same time. The spread-spectrum technique ensures there is no interference between users. Thus CDMA is able to provide consistent and clear data and voice quality communications when compared to other mobile technologies.
CDMA basically refers to any of the numerous protocols which are used in the third generation (3G) and second generation (2G) wireless communication. As the name suggests, CDMA, a type of multiplexing, allows many signals to use one single transmission channel, cleverly using the available bandwidth. The CDMA connection is established in Ultra High Frequency (UHF) systems whose frequency ranges in the 800-MHz and 1.9 GHz bands.
The CDMA channel is usually 1.23 MHz wide. CDMA networks employ a policy called soft handoff, which drastically reduces signal breakup when a handset progresses from cell to cell. The amalgamation of spread spectrum and digital modes supports much more signals per unit bandwidth as compared to analog modes. The property of CDMA being compatible with the other cellular technologies facilitates nationwide roaming. CDMA One, the original CDMA standard offers a 14.4 Kbps transmission speed in single channel mode and 115 Kbps speed in eight-channel mode. Wideband CDMA and CDMA2000 deliver data much faster.
CDMA uses spread spectrum technology in combination with Analog-To-Digital (ATD) conversion technology. Inputted audio is first digitalized into binary elements. The frequency of the signal transmitted is then made to differ, in accordance with a defined pattern (code), so that it can only be intercepted by a user who has the same frequency code programmed, and so that it goes exactly along the frequency of the transmitter. There are more than trillion possible frequency-code combinations, which makes cloning very difficult and increases the user’s privacy.
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