Combined beamformer-RAKE receiver and decorrelating detector for asynchronous CDMA systems

To reduce the undesired performance degradations due to the multiple access interference and the near-far problem under multipath fading channel environment, this paper proposes the new type of multiuser detection which has a form of hybrid structure of concatenating beamformer-RAKE receiver and decorrelating multiuser detection. To diminish the computational complexity caused from applying the decorrelating multiuser detection procedure, an efficient block Toeplitz inversion technique using matrix Levinson polynomial will be introduced. The computer simulations will be presented to demonstrate the overall performance of the proposed hybrid structure in multipath fading CDMA channel