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Efficient Bidirectional DFE for Doubly Selective Wireless Channels

Abstract

The bidirectional decision feedback equalizer (DFE) performs two equalizations, one on the received signal and one on its time-reversed version. In this paper, we apply the bidirectional DFE to wireless transmissions on rapidly time-varying dispersive channels and we propose an efficient implementation obtained by implementing the feedforward filter in the frequency domain. The feedback filter is adapted to the channel variations within one block and we propose a simplified design of the feedback filter coefficients based on a polynomial model of channel variations. Simulations performed on time-varying channels show that the proposed structure significantly outperforms existing architectures.

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Correspondence to Stefano Tomasin.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License ( https://creativecommons.org/licenses/by/2.0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Tomasin, S. Efficient Bidirectional DFE for Doubly Selective Wireless Channels. EURASIP J. Adv. Signal Process. 2006, 070572 (2006). https://doi.org/10.1155/ASP/2006/70572

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