Adaptive time-discrete filter for forming a cancelling signal from synchronous data symbols
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United States of America Patent
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Apr 24, 1990
Grant Date -
N/A
app pub date -
Dec 15, 1987
filing date -
Dec 22, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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 C.sub.i with i=0,1,2, . . . , N-1 for realizing the first N values h(i) of the impulse response as well as a recursive filter section (12') for realizing 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)=C.sub.B [C.sub.A .times.(n-1)+y(n-1)] where C.sub.A is equal to the last adjustable coefficient C.sub.N-1 of the transversal filter section (12) and C.sub.B is a predetermined fixed coefficient.
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