Asynchronous multiuser CDMA detector made simpler: Novel decorrelator, combiner, canceller, combiner (DC3) structure

A code division multiple access (CDMA) detector that employs a combination of a decorrelator and an adaptive interference canceller was proposed in [9 ] for the synchronous channel. For the asynchronous channel, the one-shot a pproach was suggested. It requires a (2K-1) dimensional decorrelator and a canceller (K is the number of users) and must be repeated once for every us er if adequate performance for all users is sought. Instead, we propose in this paper a decorrelator, data combiner, canceller, data combiner arrangement. Using maximum signal-to-noise ratio (SNR) combi ning at both data combining stages, we show that the resulting decorrelator canceller performs with an asynchronous channel as does that for the synch ronous case.