Affine Projection-Type Blind Multiuser Detection with Block Length Control under the Multipath Environment

This paper proposes affine-projection blind multiuser detection with block length control for improvement of convergence speed in DS-CDMA (direct sequence code division multiple access) systems in a multipath environment. The traditional method of controlling the block length is discussed for the situation in which the desired signal of the system is given. But due to the difficulty of the application of the above method to blind multiuser detection, some suitable improvements are performed in the proposed method. These give the proposed method advantages over the traditional detectors.