Interference reduction circuit

Details Interference reduction circuit Interference reduction circuit

1974-02-27

1976-06-15

Safourek, Benedict V.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

325 60, 328166, 333 21A, H04B 1500

Patent

active

039639908

ABSTRACT:
An interference reduction circuit to provide isolation in frequency reuse systems operates on two or more non-isolated signals by cross-coupling the signals such that the interfering signals are cancelled on each channel. In a dual-polarized frequency reuse system, cancellation is effected by adding a sample of an oppositely polarized channel of equal amplitude, but of opposite phase, to the interference. Practical implementation includes closed-loop, digital feedback control to permit dynamic signal-to-interference improvement involving no a priori knowledge of the nature of the incoming signals. The circuit has applications in satellites and earth stations in a communications satellite system.

REFERENCES:
patent: 3668567 (1972-06-01), Rosen
patent: 3728643 (1973-04-01), Chu
patent: 3735266 (1973-05-01), Amitay

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