Cdma
(priya)
Code division multiple access (CDMA) is a form of multiplexing (not a modulation scheme)
and a method of multiple access that does not divide up the channel by time (as in TDMA),
or frequency (as in FDMA), but instead encodes data with a special Code associated with
each channel and uses the constructive interference properties of the special codes to
perform the multiplexing. CDMA also refers to digital cellular telephony systems that
make use of this multiple access scheme, such as those pioneered by Qualcomm,
and W-CDMA by the International Telecommunication Union or ITU.
CDMA has since been used in many communications systems, including the Global Positioning
System (GPS) and in the OmniTRACS satellite system for transportation logistics.
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