CDMA Technology
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CDMA2000 represents a family of IMT-2000 (3G) standards providing high-quality voice and broadband data services over wireless networks. CDMA2000 builds on the inherent advantages of CDMA technologies and introduces other enhancements, such as Orthogonal Frequency Division Multiplexing (OFDM), advanced control and signaling mechanisms, improved interference management techniques, end-to-end Quality of Service (QoS), and new antenna techniques such as Multiple Inputs Multiple Outputs (MIMO) and beamforming to increase data throughput rates and quality of service, while significantly improving network capacity and reducing delivery cost.

Currently, CDMA2000 includes CDMA2000 1X (1X) and CDMA2000 EV-DO (EV-DO) standards. CDMA2000 1X (IS-2000) supports circuit-switched voice up to and beyond 35 simultaneous call per sector and high-speed data of up to 153 kbps in both directions. It was recognized by the International Telecommunications Union (ITU) as an IMT-2000 standard in November 1999. CDMA2000 EV-DO (Evolution-Data Optimized) introduces new high-speed packet-switched transmission techniques that are specifically designed and optimized for a data-centric broadband network that can deliver peak data rates beyond 3 Mbps in a mobile environment. CDMA2000 EV-DO was approved as an IMT-2000 standard (cdma2000 High Rate packet Data Air Interface, IS-856) in 2001.

Built on the principle of backwards compatibility, the CDMA2000 evolution path has provided operators favorable economics and a significant time-to-market advantage in introducing new value-added services.

CDMA2000 1X was deployed in 2000, as the first IMT-2000 standard to be commercially available, and today, along with EV-DO, it is the leading 3G technology serving around a half billion users worldwide. CDMA2000 systems provide a family of related services including cellular, PCS, WLL and fixed wireless.