A hypothesis testing approach to blind DS-CDMA user acquisition, identification, and detection via code-constrained successive cancellation

A code-constrained inverse filter criterion based approach was recently presented in a paper by Tugnait and Li for blind detection of a desired user in asynchronous short-code direct sequence code division multiple access (DS-CDMA) 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. We augment this method with a binary hypothesis testing approach 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). Illustrative simulation examples are presented.