RFI canceller using narrowband and wideband noise estimators

Details RFI canceller using narrowband and wideband noise estimators RFI canceller using narrowband and wideband noise estimators

2005-10-25

2005-10-25

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Receivers

Interference or noise reduction

C379S399010

Reexamination Certificate

active

06959056

ABSTRACT:
In an adaptive filter for cancelling common-mode noise in digital subscriber loops, a narrowband noise estimator is used to detect one or more noisy frequency bands of the common mode signal and derive therefrom a first noise estimation signal. A wideband noise estimator derives from the remainder of the common mode signal a second noise estimation signal. The first and second noise estimation signals are subtracted from the differential signal, The wideband noise estimator comprises a bandstop filter for removing the frequencies detected by the narrowband noise estimator, an analog-to-digital converter for digitizing the bandstopped signal, and an adaptive filter for deriving the second noise estimation signal from the digitized bandstopped signal and, in the process, compensating for phase and gain differences, especially attributable to the interference being injected at different points along the length of the channel.

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Bernard Widrow, et al, Adaptive Noise Cancelling: Principles and Applications, Proceedings of the IEEE, vol. 63, No. 12, Dec. 1975, pp. 1692-1716.

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