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Soft Decision Approaches for Blind Decision Feedback Equalizer Adaptation  

Chung Won-Zoo (Myong Ji University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.8, 2006 , pp. 69-76 More about this Journal
Abstract
In this paper, we propose blind adaptation strategies for decision feedback equalizer (DFE) optimizing the operation mode between acquisitionand tracking modes based on adjustable soft decision devices. The proposed schemes select an optimal soft decision device to generate feedback samples for the DFE at a given noise to signal ratio, and apply corresponding adaptation rules which combine a blind infinite impulse response (IIR) filtering adaptation and the decision-directed least mean squared (DD-LMS) DFE adaptation. These adaptation approaches attempt to achieve not only smooth transition between acquisition and tracking of DFE but also mitigation of error propagation.
Keywords
blind equalization; decision feedback equalizer; soft decision; blind initialization; joint adaptation;
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