Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Reexamination Certificate
2007-08-03
2008-09-30
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
Reexamination Certificate
active
07429949
ABSTRACT:
A method and system for generating beamforming weights for a plurality of antenna elements is disclosed. The invention consists of generating broadened nulls in a direction of arrival corresponding to one or more co-channel interference signals. The broadened nulls permit deviations in the measurement of the direction of arrival or variations therein. The increased information content inherent in generating the broadened nulls is accommodated by postulating the existence of a virtual augmented antenna array comprising the antenna elements of the physical array and a plurality of additional virtual elements. The beamforming weights for the elements of the augmented array are truncated down prior to translation to the size of the physical array and are applied to create the desired broadened nulls and thereby improve system performance.
REFERENCES:
patent: 6061023 (2000-05-01), Daniel et al.
patent: 2006/0109938 (2006-05-01), Challa et al.
K. Hugl et al., Downlink performance of adaptive antennas with null broadening, IEEE Vehicular Technology Conference, vol. 1, p. 872-876, May 1999.
P.D. Karaminas et al., Super-resolution broad null beamforming for cochannel interference cancellation in mobile radio networks, IEEE Transactions on Vehicular Technology, vol. 49, p. 689-697, May 2000.
Z. Xu et al., Modified null broadening adaptive beamforming: constrained optimisation approach, Electronics Letters, vol. 43(3), p. 145-146, Feb. 2007.
Mull Fred H.
Tarcza Thomas H.
TenXc Wireless Inc.
Townsend and Townsend / and Crew LLP
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