Method of optimizing radiation pattern of smart antenna

Details Method of optimizing radiation pattern of smart antenna Method of optimizing radiation pattern of smart antenna

2007-07-24

2007-07-24

Appiah, Charles N. (Department: 2617)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S562100, C342S377000

Reexamination Certificate

active

10292300

ABSTRACT:
In this invention, the formulas of optimizing radiation pattern of the smart antenna have been deduced and a set of weights, including amplitude and phase shift weight or only phase shift weights, for optimal channel assignment is generated using optimization techniques (e.g., advance algorithms) for smart antennas. These algorithms can deal with the Spatial Division Multiple Access (SDMA) to enlarge the capacity of communication systems and maximize the main lobes toward the users as well as minimize the pattern nulling toward the interfering sources by iterating both the amplitude weights and phase shift weights or the phase shift weight only of a cost function. Thus, an optimal radiation pattern could be derived based on the output power of the cost function with iterated amplitude and phase shift weights or only phase shift weights. At the same time, SDMA of smart antennas can be come true.

REFERENCES:
patent: 5818385 (1998-10-01), Bartholomew
patent: 6128276 (2000-10-01), Agee
patent: 6801160 (2004-10-01), Henderson et al.
patent: 7092690 (2006-08-01), Zancewicz
Barry D. Van Veen and Kevin M. Buckley, Beamforming: A Versatile Approach to Spatial Filtering, IEEE ASSP Magazine, Apr. 1988, Whole Document.
Lal C. Godara, Application of Antenna Arrays to Mobile Communications, Part II: Beam-Forming and Direction-of-Arrival Considerations, Proceedings of the IEEE, vol. 85, No. 8, Aug. 1997, Whole Document.

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