Patent ID: 6426972
Filing Date: 2002-07-30
Classification: H04L,H04N

Abstract:
A transmission channel equalizer comprising:a sparse digital filter having N tap positions and M coefficients, where N and M are integers and N is greater than M which is greater than 2; means for adaptively selecting M of the N tap positions and for assigning the M coefficients to the selected M tap positions; and means for adaptively updating the selected M coefficients both in value and in correspondence to tap positions in the sparse digital filter; wherein the means for adaptively selecting M of the N tap positions includes: means for identifying a plurality of tap positions having corresponding coefficient values that are less than a threshold value, &egr;; means for comparing the coefficient values of each of the identified plurality of tap positions to a further threshold value &dgr;; means for deleting all of the tap positions having a value less than &dgr; from the M tap positions; and means for selecting one tap position for each deleted tap position to provide M selected tap positions.