Orthogonal multiuser detection

Abstract

In this paper we propose a new linear multiuser detector for synchronous CDMA systems. Specifically, the received signal is demodulated using an orthogonal multiuser (OMU) receiver that is matched to a set of orthogonal vectors that are closest in a least-squares sense to the signature vectors. We show that this approach is equivalent to optimally whitening the noise component in the output of the decorrelator prior to detection. We provide simulation results suggesting that in many cases the OMU detector outperforms the matched filter detector and the decorrelator.