Adaptive multiuser receiver schemes for antenna arrays

This paper develops a new multiuser detector for antenna arrays. The receiver uses an adaptive multiuser receiver in a multiple sensor environment. Using this receiver, two schemes are proposed for (CDMA communications) use with antenna arrays. The first scheme is a simple extension of the multiuser detection scheme to a multisensor environment, and has a performance better than the single channel decorrelator detector. The second scheme adaptively implements an array-decorrelator detector, which exploits both spatial and code diversity. It is different from the first scheme in that it uses the array response vector estimates of each user to reduce the correlation between users´s transmitted signal. It therefore, avoids the reduction in performance when signature correlations become significant