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A subband adaptive equalization structure

Weiss, Stephan and Garcia-Alis, Daniel and Stewart, Robert (1999) A subband adaptive equalization structure. In: IEE Colloquium on Novel DSP Applications in Radio Systems, 1999-09-28 - 1999-09-28.

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Abstract

The potential presence of fractional delays, non-minimum phase parts, and a colouring of the channel output can require adaptive equalizers to adapt very long impulse responses. Besides resulting in a large computational complexity, this will in general cause slow convergence for LMS-type adaptive algorithms. In this paper, we address the equalization problem by a subband approach to reduce computational complexity and to improve convergence speed. We discuss, why amongst other possibilities of subband processing the oversampled approach is particularly appealing to significantly reduce computational complexity and improve convergence speed. Simulation results for a typical communication channels are presented and highlight the benefit of our method.