Joint Beamformer-RAKE and Decorrelating Multiuser Detector Using Matrix Levinson Polynomials

Woncheol LEE  Jonggil NAM  Chul RYU  

IEICE TRANSACTIONS on Communications   Vol.E83-B   No.8   pp.1640-1648
Publication Date: 2000/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
multiuser detection,  beamformer-RAKE receiver,  decorrelating multiuser detector,  matrix levinson polynomials,  

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This paper analyses the performance of a joint receiving structure for DS-CDMA communications systems. To reduce undesirable performance degradation due to the multiple access interferences and the near-far problem in multipath fading channel environment, this paper exploits the receiving structure for the multiuser communication composed of a beamformer-RAKE receiver and a decorrelating multiuser detector. The proposed DS-CDMA receiving structure mitigates the performance impairment invoked from the noise enhancement and reveals less computational complexity by utilizing the multipath temporal combiner prior to accessing the decorrelating detection. Also an efficient block Toeplitz inversion technique using the matrix Levinson polynomials is introduced to further diminish the computational burden encountered from applying the decorrelating multiuser detection process as in usual. Simulation results are conducted to demonstrate the superior performance of the proposed multiuser detection structure in multipath fading CDMA channel.