Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1995-01-27
1997-11-04
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342372, 4552771, 4552772, 455 333, H01Q 302, H01Q 312
Patent
active
056844913
ABSTRACT:
In a cellular type communication system a sector antenna 12 provides coverage of a sector with a relatively low receive gain. A multi-beam antenna 20 covers the same sector with a plurality of narrower beams 21', 22', 23' and 24' providing higher gain. A multi-beam antenna system 10 provides higher gain operation by selecting the one of the narrower beams 21', 22', 23' or 24' currently providing best reception of a signal transmitted by a user and coupling that selected beam to a system receiver 18. Beam selection is accomplished by sequentially coupling each narrow beam to a microprocessor based control unit 40 and storing samples of user signals as received in each narrow beam on a continuing repetitive basis. The stored samples are then analyzed in order to select the beam currently providing best reception. If, based on analysis of subsequent samples, a different one of beams 21', 22', 23' or 24' provides best reception (because of user movement or changing transmission conditions) that different beam is coupled to the system receiver 18. Spaced diversity reception is achieved by providing a second multi-beam antenna 20a and enabling the system receiver 18 to choose either of two, or both, inputs. Fail/safe operation is provided by coupling the sector antenna 12 to the system receiver 18 in the absence of coupling of a superior narrow beam signal.
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Course Outline, "The Cellular Telephone System", pp. 7-1 to 7-14. Nov. 1993 The George Washington University, School of Engineering and Applied Science, Washington DC.
Lopez Alfred R.
Newman Edward M.
Pedersen John F.
Schay Gary A.
Hazeltine Corporation
Onders E. A.
Pham Dao L.
Robinson K. P.
Tarcza Thomas H.
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