Blind channel equalizer

Abstract

A blind channel equalizer for deciding a blind coefficient of a channel equalizer for use in a digital television signal processor. The blind channel equalizer in a vestigial sideband (VSB) receiving system includes a comparator for determining a boundary level value according to the distribution of occurrence probabilities of VSB symbol levels and comparing the determined boundary level value with a received symbol, a blind decision coefficient allocator for allocating one of three blind coefficients according to an output result of the comparator, and a subtracter for performing subtraction with respect to the received symbol and an output of the blind decision coefficient allocator to provide a blind error. Inverse transformation is not necessary during the blind channel equalization, thereby simplifying the hardware structure. In addition, National Television System Committee (NTSC) interference signals can be prevented so that the performance of channel equalization can be improved.

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