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Tracking analysis of an LMS decision feedback equalizer for a wireless channel

Kavitha, Veeraruna and Sharma, Vinod (2007) Tracking analysis of an LMS decision feedback equalizer for a wireless channel. In: 13th European Wireless Conference, Paris, France, Apr.2007, Paris.

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Abstract

We consider a time varying wireless fading channel, equalized by an LMS Decision Feedback equalizer (DFE). We study how well this equalizer tracks the optimal MMSEDFE (Wiener) equalizer. We model the channel by an Autoregressive (AR) process. Then the LMS equalizer and the AR process are jointly approximated by the solution of a system of ODEs (ordinary differential equations). Using these ODEs, we show via some examples that the LMS equalizer moves close to the instantaneous Wiener filter after initial transience. We also compare the LMS equalizer with the instantaneous optimal DFE (the commonly used Wiener filter) designed assuming perfect previous decisions and computed using perfect channel estimate (we will call it as IDFE). We show that the LMS equalizer outperforms the IDFE almost all the time after initial transience.

Item Type: Conference Paper
Keywords: LMS-DFE;ODE approximation;Wiener filter;Convergence analysis; Tracking performance.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 14 Oct 2011 09:37
Last Modified: 14 Oct 2011 09:37
URI: http://eprints.iisc.ernet.in/id/eprint/41441

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