Least-mean squares adaptive digital filter havings variable size

Details Least-mean squares adaptive digital filter havings variable size Least-mean squares adaptive digital filter havings variable size

1992-11-02

1995-02-14

Kuntz, Curtis

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455307, 375 14, 3647242, H04B 1500, H04B 110, H03H 730

Patent

active

053903641

ABSTRACT:
An adaptive digital filter uses a weight adjustment unit for adjusting the weights of an adaptive digital filter according to one or more input signals to the digital filter and according to an error signal indicative of the difference between the actual and desired outputs of the digital filter. The weight adjustment unit has a first low-pass filter for low-pass filtering a signal indicative of the product of the error signal and the one or more input signals, a squarer for squaring the output of the first low-pass filter, a second low-pass filter for low-pass filtering the output of the squarer to extract the D.C. component thereof, a third low-pass filter for low-pass filtering a signal indicative of the output of the error signal squared to extract the D.C. component thereof, a dividing unit for dividing the output of the second low-pass filter by the output of the third low-pass filter to provide a loop bandwidth, and a weight calculation unit for providing values for one or more weights of the adaptive digital filter according to the previous values of the weights and the value of the loop bandwidth.

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