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Article Dans Une Revue IEEE Transactions on Communications Année : 1998

Self Adaptative Decision Feedback Equalization : Can you Skeep the training period ?

Joël Labat
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Odile Macchi
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Christophe Laot

Résumé

This paper presents a novel unsupervised (blind) adaptive decision feedback equalizer (DFE). It can be thought of as the cascade of four devices, whose main components are a purely recursive filter (R) and a transversal filter (T). Its major feature is the ability to deal with severe quickly time-varying channels, unlike the conventional adaptive DFE. This result is obtained by allowing the new equalizer to modify, in a reversible way, both its structure and its adaptation according to some measure of performance such as the mean-square error (MSE). In the starting mode, R comes first and whitens its own output by means of a prediction principle, while T removes the remaining intersymbol interference (ISI) thanks to the Godard (or Shalvi-Weinstein) algorithm. In the tracking mode the equalizer becomes the classical DFE controlled by the decision-directed (DD) least-mean-square (LMS) algorithm. With the same computational complexity, the new unsupervised equalizer exhibits the same convergence speed, steady-state MSE, and bit-error rate (BER) as the trained conventional DFE, but it requires no training. It has been implemented on a digital signal processor (DSP) and tested on underwater communications signals - its performances are really convincing.
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Dates et versions

hal-01893755 , version 1 (11-10-2018)

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  • HAL Id : hal-01893755 , version 1

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Joël Labat, Odile Macchi, Christophe Laot. Self Adaptative Decision Feedback Equalization : Can you Skeep the training period ?. IEEE Transactions on Communications, 1998, pp.921 - 930. ⟨hal-01893755⟩
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