Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Reexamination Certificate
2006-10-24
2006-10-24
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
Reexamination Certificate
active
07126531
ABSTRACT:
An array antenna system comprises an array antenna unit including multiple antenna elements and multiple phase shifters for setting weighting coefficients of the associated antenna elements; and a weight controller that generates and outputs a control signal for adjusting the weighting coefficient for each of the antenna elements, using a known signal received at each of the antenna elements. The weight controller has a channel impulse response estimation unit that estimates a channel impulse response for each of the antenna elements based on a linear combination of a first received signal obtained from the known signal when a first set of weighting coefficients is set for the antenna elements and a second received signal obtained from the known signal when a second set of weighting coefficients is set for the antenna elements; and an output unit that outputs the control signal based on the estimated channel impulse responses.
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patent: 2003/0144032 (2003-07-01), Brunner et al.
patent: 2004/0219899 (2004-11-01), Ho et al.
L.C. Godara, Application of antenna arrays to mobile communications. II. Beam-forming and direction-of-arrival considerations, Proceedings of the IEEE, vol. 85(8), p. 1195-1245, Aug. 1997.
D. Parker et al.; “Phased Arrays-Part I: Theory and Architectures”;IEEE Transactions on Microwave Theory and Techniques; vol. 50; No. 3; Mar. 2002; pp. 678-687./Discussed in the specification.
D. Parker et al.; “Phased Arrays-Part II: Implementations, Applications, and Future Trends”;IEEE Transactions on Microwave Theory and Techinques; vol. 50; No. 3; Mar. 2002; pp. 688-698./Discussed in the specification.
J.H. Winters; “Smart Antennas for Wireless Systems”;IEEE Personal Communications; Feb. 1998; pp. 23-27./Discussed in the specification.
Nakaya Yuuta
Toda Takeshi
Armstrong Kratz Quintos Hanson & Brooks, LLP
Fujitsu Limited
Mull Fred H.
Tarcza Thomas H.
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