Method and apparatus for adaptive filtering in a high interferen

Details Method and apparatus for adaptive filtering in a high interferen Method and apparatus for adaptive filtering in a high interferen

1995-07-31

1997-12-30

Vo, Don N.

Pulse or digital communications

Equalizers

Automatic

375233, 375350, H04B 110

Patent

active

057039038

ABSTRACT:
A method and apparatus for performing adaptive filtering in a high interference environment, such as for a radio, modem, or local area network. The adaptive filtering simultaneously provides interference excision while canceling resultant distortion in the signal caused by synthesizing the notch used to excise the interfering signal. An input signal (13) is pre-filtered (14) and the pre-filtered signal (15) is processed by a rejection filter (12) which combines weighted delayed versions of the pre-filtered signal (40, 42, 44, 46, 48, 50), weighted delayed versions of data decisions corresponding to the same delays as that used in the pre-filtered signal (60, 62, 64, 66, 68, 70), and a post filtered signal (27) to produce the filtered signal (19). The filtered signal (19) is processed by a data and coefficient estimator (18) to provide data decisions (25) and tap weight values (21, 23).

REFERENCES:
patent: 4747068 (1988-05-01), Voorman et al.
patent: 4768205 (1988-08-01), Nakayama
patent: 4905254 (1990-02-01), Bergmans

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