Nonlinear adaptive filters for time variant equalization

Colin F. N. Cowan

doi:10.1117/12.190841

28 October 1994 Nonlinear adaptive filters for time variant equalization

Colin F. N. Cowan

Proceedings Volume 2296, Advanced Signal Processing: Algorithms, Architectures, and Implementations V; (1994) https://doi.org/10.1117/12.190841
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

Adaptive equalization is a well established procedure used in data communications systems to compensate for channel distortions and thus allow higher signalling rates. Such systems are made adaptive because the channel characteristics are both a-priori unknown and, usually, time variant. In many systems this time variation is slow and, therefore, does not cause a problem for the adaptive processes employed. However, in the case of certain application areas, such as mobile terminals, the rate of time variation can be significant in relation to the signalling rate. Under these circumstances the performance of normal adaptive equalizers degrades rapidly. This paper presents a new adaptive equalizer structure of a non-linear form which makes use of both time and instantaneous amplitude information to provide a structure which is matched to this particular problem. Simulation results are presented which demonstrate the superiority of this structure relative to normal linear equalizers.

Citation Download Citation

Colin F. N. Cowan "Nonlinear adaptive filters for time variant equalization", Proc. SPIE 2296, Advanced Signal Processing: Algorithms, Architectures, and Implementations V, (28 October 1994); https://doi.org/10.1117/12.190841

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