Telecommunications – Transmitter and receiver at separate stations – Distortion – noise – or other interference prevention,...
Reexamination Certificate
2007-06-05
2007-06-05
Bui, Bing Q. (Department: 2614)
Telecommunications
Transmitter and receiver at separate stations
Distortion, noise, or other interference prevention,...
C455S139000, C455S278100
Reexamination Certificate
active
11045782
ABSTRACT:
An adaptive interference canceller for canceling an interfering signal corresponding to a delayed, frequency translated, amplitude and phase offset version of a transmitted signal contained in a composite received signal relayed through a relay system such as a satellite transponder. The canceller digitally downconverts the received signal and a local replica of the transmitted signal from IF to baseband, applies a variable delay and frequency compensation to the replica as a coarse delay and frequency correction, and tracks fine delay, amplitude and phase differences using an adaptive finite impulse response filter to generate a cancellation signal corresponding to the delayed and frequency shifted version. A minimum output power process produces an error signal that drives the variable delay and adaptive filter to minimize the power in the signal of interest to maximize cancellation of the interfering signal.
REFERENCES:
patent: 3419682 (1968-12-01), Thompson et al.
patent: 3750179 (1973-07-01), Tewksbury
patent: 3993867 (1976-11-01), Blood, Jr.
patent: 4086534 (1978-04-01), Olson
patent: 4140972 (1979-02-01), Fletcher et al.
patent: 4146838 (1979-03-01), Takada
patent: 4178550 (1979-12-01), Acampora et al.
patent: 4320498 (1982-03-01), Justice
patent: 4385378 (1983-05-01), Kreutel, Jr.
patent: 4393494 (1983-07-01), Belforte
patent: 4470138 (1984-09-01), Gutleber
patent: 4516236 (1985-05-01), Hadziomerovi
patent: 4535445 (1985-08-01), Lane et al.
patent: 4593399 (1986-06-01), Baugh et al.
patent: 4701935 (1987-10-01), Namiki
patent: 4712235 (1987-12-01), Jones, Jr.
patent: 4896371 (1990-01-01), Kahn
patent: 4952193 (1990-08-01), Talwar
patent: 4995104 (1991-02-01), Gitlin
patent: 5131032 (1992-07-01), Esaki et al.
patent: 5193112 (1993-03-01), Sano
patent: 5307405 (1994-04-01), Sih
patent: 5436887 (1995-07-01), Eisenhuth
patent: 5444864 (1995-08-01), Smith
patent: 5450456 (1995-09-01), Mueller
patent: 5475731 (1995-12-01), Rasmusson
patent: 5596439 (1997-01-01), Dankberg et al.
patent: 5691978 (1997-11-01), Kenworthy
patent: 6011952 (2000-01-01), Dakberg et al.
Anair Don L.
Collins Glenn D.
Ready Michael J.
Applied Signal Technology, Inc.
Bui Bing Q.
Young Barry N.
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