Tap-weight adaptation control using stepsize inversely...

Details Tap-weight adaptation control using stepsize inversely... Tap-weight adaptation control using stepsize inversely...

H - Electricity

04

B

H04B 15/00 (2006.01) H04B 1/10 (2006.01) H04B 1/12 (2006.01)

Patent

CA 2054606

- 12 - "Tap-Weight Adaptation Control Using Stepsize Inversely Variable With Signal Power Level" ABSTRACT OF THE DISCLOSURE An interference canceller comprises a first input terminal (10) to which a combined signal and noise is supplied, and a second input terminal (12) to which a reference signal correlated with the noise is supplied. A subtractor (11) has a first input coupled to the first input terminal (10) and an output coupled to the output terminal of the canceller. An adaptive filter (13) has an input connected to the second input terminal (12) and an output connected to a second input of the subtractor (11). A detector (14) is provided for generating a signal representative of the magnitude of the output of the subtractor (11). A calculation circuit (17) is coupled to the detector for generating a signal that is inversely variable as a function of the output of the detector. A multiplier (18, 20) scales a stepsize with the inversely variable signal and multiplies the output of the subtractor with the scaled stepsize. The tap-weights of the adaptive filter (13) are controlled according to the multiplied signal.

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