Method and apparatus for reducing interfering signals in a...

Details Method and apparatus for reducing interfering signals in a... Method and apparatus for reducing interfering signals in a...

2006-08-15

2006-08-15

Vuong, Quochien B. (Department: 2618)

Telecommunications

Transmitter

Noise or interference elimination

C455S063100, C455S067130, C455S127200

Reexamination Certificate

active

07092684

ABSTRACT:
An interference canceller200and corresponding method thereof operates to reduce the level of an interfering signal and includes a circulator202comprising a transmitter port, a receiver port and an antenna port, a transmission line210comprising a first end coupled to the transmitter port and a second end for coupling to a signal source; and a circuit216, having an input coupled to the receiver port206and an output coupled220to the transmission line, for providing a phase shifted version of a signal coupled to the input at the output, wherein an interfering signal at the antenna port is reverse coupled to the transmission line by the circulator and coupled to the input of the circuit so as to reduce an amplitude of the interfering signal at the second end212of the transmission line. The interference canceller concepts may advantageously be used in a single transmitter version or in a multiple transmitter version (FIG.4).

REFERENCES:
patent: 3904824 (1975-09-01), Caragliano et al.
patent: 4224622 (1980-09-01), Schmidt
patent: 5444864 (1995-08-01), Smith
patent: 5564087 (1996-10-01), Cygan et al.
patent: 5819165 (1998-10-01), Hulkko et al.
patent: 6067448 (2000-05-01), Ho et al.
patent: 6507728 (2003-01-01), Watanabe et al.

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