Device for eliminating FM or like interference from a digital mi

Details Device for eliminating FM or like interference from a digital mi Device for eliminating FM or like interference from a digital mi

1983-01-25

1985-02-19

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

455304, 455306, H04B 112

Patent

active

045010048

ABSTRACT:
In an interference elimination device for use in a digital microwave communication system in which an interference component results from at least one different microwave communication system sharing a frequency band in common, a controller (21) controls a device input signal so that a controlled signal thereby produced may include a controlled component which is equal in amplitude to the interference component and be antiphase relative thereto. The controlled signal is subtracted from the device input signal to provide a difference signal which is free from the interference component. Together with the device input signal, the difference signal is supplied to a control signal producing circuit (41) for producing an amplitude and a phase control signal for the controller. Instead of the device input signal, an interference signal derived by causing the device input signal to pass through a narrow-band filter (11 or 12) may be delivered to the controller and the control signal producing circuit. It is possible to use the difference signal as a device output signal and to implement the control signal producing circuit by an orthogonal multiplier.

REFERENCES:
patent: 3480867 (1969-11-01), Sichak
patent: 3963990 (1976-06-01), DiFonzo
patent: 4053932 (1977-10-01), Yamaguti et al.
patent: 4177430 (1979-12-01), Paul
patent: 4330764 (1982-05-01), Miedema
patent: 4380082 (1983-04-01), Namiki

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