Non-linear Effects in Interference Contaminated Adaptive Equalization

A.A. (Louis) Beex and J.R. Zeidler (USA)


nonlinear effects, NLMS, timevarying Wiener filter, multichannel Wiener filter, multichannel adaptive filter, adaptive equalization.


The presence of non-linear effects in adaptive filtering was observed previously in a wide sense stationary equalization scenario with narrowband interference. The influence of a variety of parameters on the magnitude of such non-linear effects was also investigated. While the adaptive filter appears to exhibit behavior that one would expect in a wide sense stationary scenario, we show here that the adaptive filter is actually tracking a time-varying target solution. It is the latter property that is responsible for the performance improvement of the adaptive filter over the performance of the corresponding Wiener filter.

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