Adaptive time-discrete filter for forming a cancelling...

Details Adaptive time-discrete filter for forming a cancelling... Adaptive time-discrete filter for forming a cancelling...

H - Electricity

03

H

328/0.5

H03H 21/00 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1265847

ABSTRACT Adaptive time-discrete filter for forming a cancelling signal from synchronous data symbols. An adaptive time-discrete filter having an impulse response h(i) with i = 0,1,2,.... for forming a cancelling signal from synchronous data symbols (for example to cancel echoes or lagging intersymbol interference) comprises a transversal filter section (12) having adjustable coefficients Ci with i = 0,1,2,....,N-1 for realising the first N values h(i) of the impulse response as well as a recursive filter section (12') for realising the values h(i) with i = N,N+1,....... The recursive filter section (12') receives the input signal delayed over N-1 discrete time intervals from the adaptive filter as an input signal x(n) and forms an output signal y(n) according to the relationship: y(n) = CB[CAx(n-1) + y(n-1)] where CA is equal to the last adjustable coefficient CN-1 of the transversal filter section (12) and CB is a predetermined fixed coefficient (Figure 4).

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