Code-Division Multiple Access
The third and most important type of multiplexing technique is CDMA. CDMA, or spread spectrum technology, uses the entire bandwidth for every user such that a particular user is selected based on a code specific to that user. In CDMA systems, on many occasions the bandwidth made available to the user is several times the bandwidth needed for actual communication. CDMA is a difficult concept to visualize, but it has tremendous benefits compared to FDM and TDM, among which are the following:
By using CDMA, the power requirement by wireless antennas is much lesser as compared to the other counterparts. Typical CDMA antenna can consume up to 6 to 7 milliwatts (mw) of power for transmission, which is significantly less ...
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