Tapped delay line model for band-limited multipath channel in DS-CDMA mobile radio

Abstract

It is explained that a correlated tapped delay line model needs to be assumed for transmission performance estimation using Rake combining, even though the propagation channel itself can be characterised as a wide sense stationary uncorrelated scattering channel, Fading correlation between different tap gains can be computed by taking into account the transmit and receive chip pulse shaping filters. A simple example, showing how correlation affects performance estimation in Rake combining, is presented. Assuming a two-path Rayleigh fading propagation channel.