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Nonlinear multiuser parameter estimation and tracking in CDMA systems

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2 Author(s)
Caffery, J., Jr. ; Dept. of Electr. & Comput. Eng., Cincinnati Univ., OH, USA ; Stuber, G.L.

This paper presents a joint channel coefficient and time-delay tracking technique for code-division multiple-access (CDMA) systems. Due to the highly nonlinear nature of time delay estimation, an iterative nonlinear filtering algorithm, called the “unscented filter” (UF), is employed. The UF can provide a better alternative to nonlinear filtering than the conventional extended Kalman filter (EKF) since it avoids errors associated with linearization. The Cramer-Rao lower bound is derived for the estimator, and computer simulations show that it provides a more viable means for tracking time-varying amplitudes and delays in CDMA communication systems than estimators based on the EKF

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Communications, IEEE Transactions on  (Volume:48 ,  Issue: 12 )