SAGE-based multiuser detection for multirate DS/CDMA systems

We consider the problem of multiuser detection for synchronous multirate DS/CDMA systems. We assume that each user may transmit at one out of S available data-rates. Thus, we devise and assess a novel multiuser receiver based on the space alternating generalized expectation-maximization (SAGE) algorithm. Interestingly, the resulting algorithm has an acceptable computational complexity and, in general, outperforms several linear multirate receivers.