Bootstrap algorithm: A robust multiuser CDMA detector with time delay variation

Document Type

Conference Proceeding

Publication Date

12-1-1997

Abstract

Almost all near-far resistant detectors, adaptive or non-adaptive, assume knowledge of the relative delays of the different users' signals. Estimation and tracking errors of these delays cause errors in the correlation matrix as they all perceived by the receiver. Some linear detectors, like decorrelating detector, minimum mean-square error (MMSE) detector, or nonlinear detectors, such as zero-forcing decision decision-feedback (ZF-DF) detector, all directly perform some manipulation on the correlation matrix and hence they are very sensitive to delay shift or estimation error. The bootstrap detector, on the other hand, performs adaptive transformation on the output of the matched filter directly, taking into account any such errors if they exist. Therefore one may expect this detector to be more robust to delay errors. In this paper we will analyze the bootstrap detector when delay errors exist. We will examine analytically, as well as by simulation, the BER obtained with this detector and compare it to the conventional decorrelating detector. We will show that while the latter becomes non near-far resistant when error exists, the bootstrap stays near-far resistant in the limit although with some degradation in performance when the condition number of the correlation matrix becomes large.

Identifier

0031376532 (Scopus)

Publication Title

IEEE International Symposium on Personal Indoor and Mobile Radio Communications PIMRC

First Page

68

Last Page

72

Volume

1

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