Abstract: The problem of blind multiuser detection of CDMA signals in fading channels is considered. It is noted that the minimum-mean-square-error (MMSE) detector often loses phase to lock a desired signal when the desired signal dips into a deep fade. This paper proposes a suboptimal blind MMSE detector that is incorporated into the desired user's signature waveform and the auxiliary vector to achieve low-complexity. It decouples the signal phase, and fits into realistic fading channels.

Key words: code-division multiple-access, minimum-mean-square-error detector, fading channels