Glossary of Android OS Terms

The list below defines some of the basic terminology of the Android platform

CDMA

Code-division multiple access (CDMA) is mobile phone standards called cdmaOne, CDMA2000 (the 3G evolution of cdmaOne) and WCDMA (the 3G standard used by GSM carriers), which are often referred to as simply CDMA, and use CDMA as an underlying channel access method.

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 bandwidth – 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. CDMA is widely used in the USA, Brazil and India.

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