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Technical Program

Paper Detail

Paper:	SPCOM-P12.4
Session:	MIMO: Precoding / Beamforming
Time:	Friday, May 19, 14:00 - 16:00
Presentation:	Poster
Topic:	Signal Processing for Communication: Multi-rate, CDMA and spread spectrum communication
Title:	Large-System Comparison of Space-Time Transmit Diversity and Orthogonal Transmit Diversity For Downlink W-CDMA
Authors:	Belkacem Mouhouche, Freescale Semiconductor, Inc., France
Abstract:	In this paper, we continue our study of the asymptotic performance of W-CDMA transmit diversity that we started in Icassp'05. We compare the performance of two open-loop transmit-diversity techniques for W-CDMA: The Space Time Transmit Diversity (STTD) and the Orthogonal Transmit Diversity (OTD). We use the output SINR provided by a RAKE receiver when combined with each of these diversity techniques. It is impossible to obtain useful conclusions about the performance of the two techniques because of the dependance of the SINR in a complex way on many parameters like the spreading codes, the channel, etc. We follow the classical approach used for the first by Tse and hanly in 99 and assume that the spreading codes are random following a certain distribution. In this case, the SINRs can be interpreted as random variables. We consider the limit of the these SINRs when the spreading factor N and the number of users K tend to infinity with fixed ratio. Under these conditions, the output SINRs can be shown to converge to deterministic limits independent of the "random" spreading codes. We interpret the output SINRs and discuss the different parameters influencing the performance of the two techniques.