Adaptive weak signal identification system

Details Adaptive weak signal identification system Adaptive weak signal identification system

1994-06-23

1995-06-06

Chin, Stephen

Pulse or digital communications

Receivers

Interference or noise reduction

375351, H03D 104, H03D 106, H04L 2508

Patent

active

054229120

ABSTRACT:
An adaptive weak signal identification system having a simple implementation which is capable of rapidly tracking weak signals with time varying frequencies in the presence of a strong interference signal. The system includes a first Fast Fourier Transform circuit for performing a Fast Fourier Transform on a discrete block of data points of an input data signal. A filter coefficient generator is coupled to the output of the Fast Fourier Transform circuit, and identifies the frequency of the strong interference signal, and then based thereon generates filter coefficients for a notch filter. A notch filter receives the generated filter coefficients, and further has the input data signal as an input, on which it performs a notch filtering operation to dramatically reduce the intensity of the interference signal. A second Fast Fourier Transform circuit then performs a Fast Fourier Transform on the output passed by the notch filter, and the output of the Fast Fourier Transform circuit is analyzed to identify the frequency of the weak signal of interest.

REFERENCES:
patent: 5260974 (1993-11-01), Johnson et al.
patent: 5339463 (1994-08-01), Hansen

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