Implementation of a CDMA receiver with multiple-access noise rejection

A DS-CDMA receiver is typically implemented as a matched filter. Such a receiver, while optimum in additive white Gaussian noise, may yield poor performance when multiple-access noise is the dominant interference. Previously proposed multiple-user receivers greatly improve performance in this situation, but quickly become prohibitively complex for systems of realistic size. The authors propose a receiver which takes advantage of the colored power spectrum of the multiple-access noise to reject it. The receiver is simple to implement, can run at high rates, and can be tuned adaptively. It is designed to maximize signal-to-noise ratio, but is also shown to yield a substantial improvement over the conventional receiver in average probability of error