Blind user identification and detection in dispersive DS-CDMA systems using code-constrained successive cancellation

A code-constrained inverse Iter criterion based approach was recently presented in Tugnait & Li (IEEE Trans. SP, July 2001) for blind detection of a desired user in asynchronous short-code DS-CDMA (direct sequence code division multiple access) systems over multipath channels. The method proposed therein works well for low-to-moderate loading; however, it can converge to an undesired user under high loading. In this paper we augment this method with methods for extracted user identification (whether the desired user is acquired/extracted) and for successive user cancellation (if an undesired user is extracted, cancel its contribution and repeat). An illustrative simulation example is presented.