Interference cancellation system employing an I/Q quadrature rot

Details Interference cancellation system employing an I/Q quadrature rot Interference cancellation system employing an I/Q quadrature rot

1994-10-13

1996-12-10

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455 84, 4552781, 375346, H04B 110

Patent

active

055840655

ABSTRACT:
An interference cancellation system for cancelling interfering signals which is adapted to be connected to a radio receiver system having a receiver antenna, a receiver and a receiver transmission line interconnecting the receiver antenna and the receiver includes an auxiliary antenna, a first directional coupler connected to the auxiliary antenna, a second directional coupler or error coupler connected to the receiver transmission line, a synchronous detector connected to the first and second directional couplers, a vector rotator connected to the outputs of the synchronous detector, a signal controller connected to the vector rotator and a third directional coupler or summer coupler connected to the receiver transmission line and to the signal controller. The vector rotator enables the internal time match of the cancellation system to be optimized by quadrature positioning by varying resistor values in the vector rotator circuit. After the match is optimized, the phase position between the reference signal path and error signal path can be set independently of the time match.

REFERENCES:
patent: 3699444 (1972-10-01), Ghose et al.
patent: 4599732 (1986-07-01), LeFever
patent: 5117505 (1992-05-01), Talwar
patent: 5125108 (1992-06-01), Talwar
patent: 5140699 (1992-08-01), Kozak
patent: 5428831 (1995-06-01), Manzello et al.

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