Abstract
The chapter presents an overview of the cdma2000 air interface, starting from the original derivation of IS-95 and leading into the enhancements that make up cdma2000. The cdma2000 system is the third-generation extension of the existing IS-95 CDMA system currently deployed worldwide. The IS-95 and cdma2000 systems were developed with the primary intention of increasing the voice capacity offered in cellular systems. As a result, these systems are also primarily optimized for circuit-switched data services. However, these systems have been extended to make them more suitable for multiple-access packet-switched services. The cdma2000 supports time multiplexing of services, as introduced in TIA/EIA-95-B in the form of primary and secondary traffic. In addition, multicode transmission is also supported. Although its time-multiplexing capability may be expanded, time multiplexing of service instances on a single physical channel is currently not possible. The cdma2000 evolution systems try to address this issue. The chapter also discusses in detail the basic concepts of IS-95 air interface, IS-95 forward link, paging channel, and dedicated channels. Also covered in the chapter are topics, such as spreading and modulation solutions, coherent detection in the reverse link, and new cdma2000 1X common channels.
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