A Blind Space-Time Decorrelating RAKE Receiver in a DS-CDMA System in Multipath Channels
Bin Xu · OhioLink ETD Center (Ohio Library and Information Network) · 2004
This paper addresses the problem of blind multiple access interference (MAI) and intersymbol interference (ISI) mitigation in direct sequence code division multipath access (DS/CDMA) systems.Studies show that multiuser detection can be performed without the knowledge of users' channel parameters in a frequency-selective fading channel, and these approaches are of high computational complexity.In this thesis, a space-time decorrelating RAKE receiver is developed in the AWGN channel.This method is blind because it only needs to know the desired user's signature sequence and timing information.A time-varying multipath channel that has the desired temporal-spatial correlation properties is simulated, and is used to evaluate the performance of the receiver.We also develop an adaptive algorithm for the proposed receiver.Simulations show that the proposed receiver is near-far resistant, able to eliminate MAI and ISI effectively, and has high performance with low complexity.