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An Equalization Technique of Dual-Feedback Structure in ATSC DTV Receivers  

Oh, Young-Ho (Dept. of electronics engineering and RRC HECS)
Kim, Dae-Jin (Dept. of electronics engineering and RRC HECS)
Publication Information
Journal of Broadcast Engineering / v.10, no.4, 2005 , pp. 540-547 More about this Journal
Abstract
In the DFE(Decision Feedback Equalizer) for ATSC DTV receivers, there are decision errors in the slicer or. the simplified trellis decoder, and these decided false data comes to the feedback filter to make the error propagation phenomenon. The error propagation degrades the equalizer performance by increasing residual errors as well as slowing down the convergence rate. In this paper we propose a dual-feedback equalization structure. There are two feedback filters. One is the decision feedback filter which uses the simplified trellis decoder output data, the other is non-decision feedback filter which uses the equalizer output data. The additional non-decision feedback filter doesn't introduce the error propagation, so it can compensate the error propagation. The proposed structure accelerates the convergence rate as well as reduces output men-square error(MSE). We analyzed the performance enhancement of DTV receiver using dual-feedback equalization structure.
Keywords
Equalizer; ATSC DTV; 8-VSB; Error propagation;
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