An investigation of RAKE receiver operation in an urban environment for various spreading bandwidth allocations

Abstract

The renewed interest in the application of the spread sprectrum technique to mobile mdio systems, both in the U.S. and now within Eurupe thruugh the RACE II and U.K. DTI/SERC LINK programs continues to gather momentum. To this end, an analytical performance model has been developed at Bristol in order to provide a greater insight into the opemtion of this technique, in particular the sensitivity of the bandwidth eficiency of the network to the form of diversity signal processing employed in the mobile tmnsceiver. This theme is continued in this paper with an investigation of the wideband channel characteristics of an urban service area. Results are presented relating the statistics of the R A K E receiver bmnches to the spreading bandwidth employed.

A combined analytical model on the bit error performance of a DS-CDMA wireless communication system in presence of Doppler shift, timing error and frequency offset

“…Wireless communication system always suffers multi user interference and different types of channel impairment like fading, Doppler shift and multipath propagation [2]. CDMA has a very unique feature to combat these effects by employing rake receiver by means of path diversity scheme [3]. The rake receiver is a rake of correlation receivers which assigns different multipath components at different finger and applies code for desired user matched to exact delay of each multipath channel [4].…”