US 2001/0019583 A1Published application

Bi-directional viterbi equalization device

OwnerKen Udagawainventor

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Abstract

A forward equalizer subjects a received signal to equalization in a forward direction with respect to time base, and outputs a signal representative of the equalization result. A backward equalizer subjects the received signal to equalization in a backward direction with respect to time base, and outputs a signal representative of the equalization result. An equalizer-less detector subjects the received signal to detection, and outputs a signal representative of the detection result. A determination is made as to whether or not both the signals outputted from the forward equalizer and the backward equalizer reside in a selection reference range. When both the signals outputted from the forward equalizer and the backward equalizer do not reside in the selection reference range, a final decision-result symbol is determined on the basis of the signals outputted from the forward equalizer, the backward equalizer, and the equalizer-less detector.

Claims7

Dependent claims

A bi-directional Viterbi equalization device comprising:

a forward equalizer subjecting a received signal to forward equalization in a forward direction with respect to time base, and outputting a signal representative of a result of the forward equalization;
a backward equalizer subjecting the received signal to backward equalization in a backward direction with respect to time base, and outputting a signal representative of a result of the backward equalization;
an equalizer-less detector subjecting the received signal to detection, and outputting a signal representative of a result of the detection;
first means for determining whether or not both the signals outputted from the forward equalizer and the backward equalizer reside in a selection reference range;
and
second means for, when the first means determines that both the signals outputted from the forward equalizer and the backward equalizer do not reside in the selection reference range, determining a final decision-result symbol on the basis of the signals outputted from the forward equalizer, the backward equalizer, and the equalizer-less detector.

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Dependencies are inferred from the claim text.