Cancellation system for frequency reuse in microwave...

Details Cancellation system for frequency reuse in microwave... Cancellation system for frequency reuse in microwave...

2007-10-16

2007-10-16

Phu, Sanh D. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S226300, C375S346000

Reexamination Certificate

active

11102088

ABSTRACT:
Substantial improvements in frequency reuse in microwave communications systems is achieved by canceling co-channel interference and transmitter leakage. Interferometric beam-narrowing reduces beamwidth without reducing peak magnitude of the beam pattern. Frequency-dependent beam-shaping compensates for frequency-dependent distortions of the beam pattern thereby improving bandwidth. A spatial demultiplexing technique utilizes spatial gain distributions of received signals to separate signals, even from co-located transmit sources, and uses microwave lensing to enhance received spatial gain distributions. Predetermined cross-polarization interference is used to separate differently-polarized receive signals. A reference branch provides a cancellation signal to a receiver to cancel transmitter leakage signals. An error signal controls an impedance-compensation circuit that is responsive to changes in antenna impedance but not to receive signals. A dc bias magnetic field applied to a magnetic permeable material adjusts non-linear distortion in a cancellation circuit for canceling distortion in a transmitter leakage signal. Discreet impedance elements approximate a circuit having distributed impedance.

REFERENCES:
patent: 3766559 (1973-10-01), Butcher et al.
patent: 4561114 (1985-12-01), Kozono et al.
patent: 5533055 (1996-07-01), Matzek
patent: 5594946 (1997-01-01), Menich et al.
patent: 5603087 (1997-02-01), Shultz

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