Cancellation system for frequency reuse in microwave communicati

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

1997-05-23

1999-12-28

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Utilizing correlation techniques

342361, 370310, 250551, G01S 316

Patent

active

060087609

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: 3860343 (1975-01-01), Janney et al.
patent: 4313225 (1982-01-01), Carbrey et al.
patent: 4970519 (1990-11-01), Minnis et al.
patent: 5105435 (1992-04-01), Stilwell
patent: 5132694 (1992-07-01), Sreenivas
patent: 5373301 (1994-12-01), Bowers et al.
patent: 5432522 (1995-07-01), Kurokami
patent: 5471647 (1995-11-01), Gerlach et al.
patent: 5515378 (1996-05-01), Roy et al.
patent: 5523526 (1996-06-01), Shattil
patent: 5592490 (1997-01-01), Barratt et al.
patent: 5634199 (1997-05-01), Gerlach et al.
PCT/US94/08247, Shattil, "Active Electromagnetic Shielding", filed Jul. 22, 1994.
U.S. Pat. Appl. 08/279,050, Shattil, "Inductive Noise Cancellation Circuit . . . ", filed Jul. 22, 1994.

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