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 Definition: Code division multiple access (CDMA) is a channel access method utilized by various radio communication technologies.
It should not be confused with the mobile phone standards called cdmaOne and CDMA2000 (which are often referred to as simply 'CDMA'), that use CDMA as their underlying channel access methods.
One of the basic concepts in data communication is the idea of allowing several transmitters to send information simultaneously over a single communication channel.
This allows several users to share a bandwidth of frequencies.
This concept is called multiplexing.
CDMA employs spread-spectrum technology and a special coding scheme (where each transmitter is assigned a code) to allow multiple users to be multiplexed over the same physical channel.
By contrast, time division multiple access (TDMA) divides access by time, while frequency-division multiple access (FDMA) divides it by frequency.
CDMA is a form of 'spread-spectrum' signaling, since the modulated coded signal has a much higher data bandwidth than the data being communicated.
Source: Wikipedia (http://en.wikipedia.org/wiki/CDMA)
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