Patent ID: 6307884
Filing Date: 2001-10-23
Classification: H04L

Abstract:
In a communication channel of the type characterized as having a dual decision feedback equalizer comprising a pair of nominally independent decision feedback equalizers operably coupled in parallel to receive a series of input signals, each decision feedback equalizer comprising a slicer which applies a selected threshold to generate a series of decisions nominally indicative of peak data values of the series of input signals and a feedback filter having a response excited by previous decisions which provides a filtered output which is subtracted from the series of input signals in order to cancel intersymbol interference and generate a series of decision variables which are input to the corresponding slicer, each slicer further generating a series of error terms in relation to presence of noise in the channel as a difference between the corresponding series of decision variables and series of decisions, the improvement comprising:a pair of attenuators, each associated with a different one of the decision feedback equalizers and applying an attenuation gain of less than one to the associated feedback filter when a mismatch occurs between the series of decisions output by the decision feedback equalizers.