MUSIC based joint parameter estimation of multiuser asynchronous DS CDMA signals in unknown fading channel in SIMO antenna system

A MUSIC type algorithm for joint parameter estimation in an asynchronous DS CDMA system with a multiple output (MO) antenna system at the base station and a single input (SI) system at the mobile users is proposed. It is applied in downlink processing and it enables the joint estimation of time delay, frequency shift and direction of departure (DOD) of transmitted asynchronous DS CDMA signals using a single antenna system at the mobile. The proposed algorithm is well suited to an unknown fading channel, frequency selective or dispersive, and it can be primary used as a method for multipath channel identification. It seems to the authors that it can be used as a basis for the further improvement of process of detection at the mobile receiver.