Method and intelligent digital beam forming system with improved

Details Method and intelligent digital beam forming system with improved Method and intelligent digital beam forming system with improved

1996-10-30

1999-01-05

Tarcza, Thomas

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

Directive

Including a steerable array

342372, 342373, 342375, H01Q 322

Patent

active

058568042

ABSTRACT:
An intelligent digital beam former (10) in conjunction with a satellite based array antenna (20) provides a plurality of dynamically controllable antenna beams (52) for communication with subscriber units on earth's surface. The location of a subscriber unit (90) requesting communication services is determined and an individual antenna beams is formed and assigned to the subscriber unit. The antenna beam tracks the subscriber units as the satellite and/or the subscriber unit moves. The digital beam forming coefficients are dynamically adjusted and controlled to help maximize the signal quality of communications with the subscriber units.

REFERENCES:
patent: 4216475 (1980-08-01), Johnson
patent: 4804963 (1989-02-01), Clapham
patent: 4901082 (1990-02-01), Schreiber et al.
patent: 5581517 (1996-12-01), Gee et al.
patent: 5585803 (1996-12-01), Miura et al.
patent: 5680863 (1997-10-01), Hossack et al.
"Adaptive Arrays", Sidney P. Applebaum, IEEE Transactions on Antennas and Propagation, vol. AP-24, No. 5, pp. 585-598, Sep. 1976.
"Digital Beamforming Antennas: An Introduction*", Hans Steyskal, Microwave Journal, pp. 107-124, Jan. 1987.
"Beamforming: A Versatile Approach to Spatial Filtering", Barry D. Van Veen and Kevin M. Buckley, IEEE ASSP Magazine, pp. 4-24, Apr. 1988.

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