Glossary

1X RTT: The abbreviation used to describe the first phase of CDMA2000 that uses a single 1.25-MHz bandwidth RF carrier channel. The abbreviation RTT stands for Radio Transmission Technology spreading, and the 1X element indicates that it uses the spreading required for one 1.25-MHz channel.
3GPP: Third Generation Partnership Programme. The standards body and organization used to develop and coordinate W-CDMA/UMTS development.
3GPP2: Third Generation Partnership Programme 2. The standards body and organization used to coordinate the development of CDMA2000 in the USA.
3X RTT: The version of CDMA2000 that will be capable of higher data rates than 1X systems. It uses a spreading rate of three times the basic 1X technology. RTT stands for Radio Transmission Technology.

ACELP: Algebraic Code Excited Linear Prediction. A vocoder technique used in GSM and NA-TDMA.
ADPCM: Adaptive Differential Pulse Code Modulation. A form of speech coding widely used for wireless local loop networks and cordless phones employing a 32-kbps data rate.
Air interface: The interface between the mobile phone and the base station. Often this refers to the protocols used in this area.
AM: Amplitude Modulation. A form of modulation used widely on the long-, medium- and short-wave broadcast bands. It involves changing the amplitude of the signal in line with the instantaneous amplitude of the incoming audio or modulating signal.
AMPS: Advanced Mobile Phone System. The analogue first-generation mobile phone system used extensively in North America and many other countries.

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Cellular Communications Explained From Basics to 3G