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Title: Adaptive symbol and parameter estimation in asynchronous multiuser CDMA detectors
Authors: Lim, T.J. 
Rasmussen, L.K. 
Keywords: Adaptive detectors
Delay tracking
Multiuser cdma
Issue Date: 1997
Citation: Lim, T.J.,Rasmussen, L.K. (1997). Adaptive symbol and parameter estimation in asynchronous multiuser CDMA detectors. IEEE Transactions on Communications 45 (2) : 213-220. ScholarBank@NUS Repository.
Abstract: Existing multiuser code-division multiple-access (CDMA) detectors either have to rely on strict power control or near-perfect parameter estimation for reliable operation. In this paper, a novel adaptive multiuser CDMA detector structure is introduced. Using either an extended Kaiman filter (EKF) or a recursive least squares (RLS) formulation, adaptive algorithms which jointly estimate the transmitted bits of each user and individual amplitudes and time delays may be derived. The proposed detectors work in a tracking mode after initial delay acquisition is accomplished using other techniques not discussed here. Through computer simulations, we show that the algorithms perform better than a bank of single-user (SU) receivers in terms of near-far resistance. Practical issues such as the selection of adaptation parameters are also discussed in some detail. © 1997 IEEE.
Source Title: IEEE Transactions on Communications
ISSN: 00906778
DOI: 10.1109/26.554369
Appears in Collections:Staff Publications

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