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Title: An asynchronous multiuser CDMA detector based on the Kalman filter
Authors: Lim, T.J. 
Rasmussen, L.K. 
Sugimoto, H.
Keywords: Adaptive estimation
Code division multiaccess
Kalman filtering
Land mobile radio cellular systems
Multiuser channels
Issue Date: Dec-1998
Citation: Lim, T.J.,Rasmussen, L.K.,Sugimoto, H. (1998-12). An asynchronous multiuser CDMA detector based on the Kalman filter. IEEE Journal on Selected Areas in Communications 16 (9) : 1711-1722. ScholarBank@NUS Repository.
Abstract: In this paper, we introduce a multiuser receiver based on the Kalman filter, which can be used for joint symbol detection and channel estimation. The proposed algorithm has the advantage of working even when the spreading codes used have a period larger than one symbol interval ("long codes"), unlike adaptive equalizer-type detectors. Simulation results which demonstrate the performance advantage of the proposed receiver over the conventional detector, the minimum mean squared error (MMSE) detector and a recursive least squares (RLS) multiuser detector are presented. A thorough comparison of the MMSE detector and the proposed detector is attempted because the Kalman filter also solves the MMSE parameter estimation problem, and it is concluded that, because the statespace model assumed by the Kalman filter fits the code division multiple access (CDMA) system exactly, a multiuser detector based on the Kalman filter must necessarily perform better than a nonrecursive, finite-length MMSE detector. The computational complexity of the detector and its use in channel estimation are also studied.
Source Title: IEEE Journal on Selected Areas in Communications
ISSN: 07338716
DOI: 10.1109/49.737640
Appears in Collections:Staff Publications

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