Accurate BER Analysis of QPSK Modulated Asynchronous DS-CDMA Systems Communicating over Rayleigh Channels

Abstract— The accurate average BER calculation of an asynchronous DS-CDMA system using random spreading sequences is studied in Rayleigh fading channels. An accurate closedform expression is derived for the conditional characteristic function of the multiple access interference. An accurate BER expression is provided, which only requires a single numerical integration. Our numerical simulation results verify its accuracy, and also demonstrate the relative inaccuracy of the Gaussian approximation.

• Type: Conference
• Year: 2006
• Where: VTC
• Authors: Xiang Liu, Lajos Hanzo
• Keywords: Accurate Average Ber, Accurate Ber Expression, Accurate Closedform Expression, VTC 2006