Decision-feedback type equalizer

Details Decision-feedback type equalizer Decision-feedback type equalizer

Filed on

1996-03-15

Date issued

1997-09-16

Examiner

Chin, Stephen

Patent Class

Pulse or digital communications

SubClass

Equalizers

SubSubClass

Automatic

Other Related Categories

375232, 3647242, 333 28R, H03H 730, H03H 740, H03K 5159

Type

Patent

Status

active

Patent number

056688334

Description

ABSTRACT:
A decision-feedback type equalizer comprising a forward equalizer for receiving digital pre-equalization signals and error signals as input signals, for reducing intersymbol interference caused by the lead echo of the pre-equalization signals, and for outputting forward equalization signals; a backward equalizer for reducing intersymbol interference caused by the delay echo of input signals, and for producing output in the form of backward equalization signals; an adder for adding forward equalization signals and backward equalization signals, and for outputting equalization signals; a decision device for comparing the equalization signals with reference values, and for outputting decision signals; a subtracter for subtracting the equalization signals and decision signals, and for producing and outputting error signals which are differences; an alarm emitter for detecting, from the signal states of the error signals, whether an abnormal state exists, and for emitting an alarm when an abnormal state is detected; and a selection circuit which, depending on whether an alarm emitter output alarm signal is present or absent, is used for selecting either equalization signals or decision signals, and which, when there is alarm signal input, is used for selecting equalization signals and for supplying them as input signals to the backward equalizer, such that detection of the alarm condition reduces propagation or magnification of errors caused by noise.

REFERENCES:
patent: 4328585 (1982-05-01), Monsen
patent: 5297165 (1994-03-01), Ueda et al.
patent: 5398259 (1995-03-01), Tsujimoto
patent: 5440583 (1995-08-01), Koike
patent: 5524125 (1996-06-01), Tsujimoto

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