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Adaptive synchronization and channel parameter estimation using an extended Kalman filter

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3 Author(s)
Aghamohammadi, A. ; Lehrstuhl fuer Elektrische Regelungstech., Aachen Univ. of Technol., West Germany ; Meyr, H. ; Ascheid, G.

Unified modeling and estimation of the MD (multiplicative distortion) in finite-alphabet digital communication systems is presented. A simple form of MD is the carrier phase exp(jθ), which has to be estimated and compensated for in a coherent receiver. A more general case with fading must, however, allow for amplitude as well as phase variations of the MD. The authors assume a state-variable model for the MD and generally obtain a nonlinear estimation problem with additional randomly varying system parameters such as received signal power, frequency offset, and Doppler spread. An extended Kalman filter is then applied as a near-optimal solution to the adaptive MD and channel parameter estimation problem. Examples are given to show the use and some advantages of this scheme

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Communications, IEEE Transactions on  (Volume:37 ,  Issue: 11 )