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|Title:||Adaptive symbol and parameter estimation in asynchronous multiuser CDMA detectors|
|Authors:||Lim, T.J. |
|Source:||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. https://doi.org/10.1109/26.554369|
|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|
|Appears in Collections:||Staff Publications|
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