A Link-Level Simulator of the cdma2000 Reverse-Link Physical Layer

Published

August 1, 2003

Author(s)

Hamid Gharavi, F Chin, K Ban, R Wyatt-Millington

Abstract

The cdma2000 system is an evolutionary enhancement of the IS-95 standards which support 3G services defined by the International Telecommunications Union(ITU). cdma2000 comes in two phases: 1XRTT and 3XRTT (1X and 3X indicatesthe number of 1.25 MHz wide radio carrier channels used and RTT stands forRadio Transmission Technology). The cdma2000 1XRTT, which operates withina 1.25 MHz bandwidth, can be utilized in existing IS-95 CDMA channels as it usesthe same bandwidth, while 3XRTT requires the commitment of 5 MHz bandwidth to support higher data rates. This paper describes a software model implementation of the cdma2000 reverse link and its application for evaluating theeffect of rake receiver design parameters on the system performance under various multipath fading conditions. The cdma2000 models were developed at theNational Institute of Standards and Technology (NIST), using SPW (SignalProcessing Worksystem) commercial software tools. The model has beendeveloped in a generic manner that includes all the reverse link six radioconfigurations and their corresponding data rates, according to cdma2000specifications. After briefly reviewing the traffic channel characteristics of thecdma2000 reverse link (subscriber to base station), the paper discusses the rakereceiver implementation including an ideal rake receiver. It then evaluates theperformance of each receiver for a Spreading Rate 3 (3XRTT) operation, which is considered as a true 3G cdma2000 technology. These evaluations are based on the vehicular IMT-2000 (International Mobile Telecommunication 2000) channel model using the link budget defined in cdma2000 specifications for the reverse link.

Citation

Journal of Research (NIST JRES) -

Volume

108 No. 4

NIST Pub Series

Journal of Research (NIST JRES)

Pub Type

NIST Pubs

Keywords

cdma2000, code division multiple access (cdma), IMT 2000, IS95, mobile communications, mobile systems (3G), rake receiver, reverse link, third generation wireless

Citation

Gharavi, H. , Chin, F. , Ban, K. and Wyatt-Millington, R. (2003), A Link-Level Simulator of the cdma2000 Reverse-Link Physical Layer, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD (Accessed October 9, 2025)