Code Division Multiple Access (CDMA) implemented with Direct-Sequence Spread-Spectrum (DS-SS) modulation is emerging as a popular multiple-access technology for personal, cellular and satellite communication services. Multiuser detection techniques can substantially increase the capacity of CDMA systems. Over the past decade, a significant amount of research has addressed various multiuser detection schemes. Considerable recent attention has been focused on adaptive multiuser detection. For example, methods for adapting the decorrelating, or zero-forcing, linear detector that require the transmission of training sequences during adaptation have been proposed.