Simplified narrowband excision

Details Simplified narrowband excision Simplified narrowband excision

2004-07-15

2009-08-11

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Transmitters

C375S296000, C375S222000

Reexamination Certificate

active

07573947

ABSTRACT:
An improved ingress cancellation filter comprising a Fast Fourier Transform circuit which replaces the analysis filter bank of the prior art to break the incoming signal down into sub bands, an ingress cancellation filter that weights each sub band based upon the probability that the sub band is corrupted by noise, and an inverse Fast Fourier Transform circuit to put the weighted sub bands back together into an output signal and replacing the synthesis filter bank of the prior art. Also, an improved predictor filter which can be used with CDMA circuitry by initializing the predictor filter at the beginning of each spreading interval using the samples received on the first L unused codes of the spreading interval.

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