Smart antenna arrays
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United States of America Patent
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Sep 21, 2004
Grant Date -
Dec 12, 2002
app pub date -
May 23, 2002
filing date -
Jun 12, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to a beamforming method for smart antenna arrays, and in particular relates to a beamforming method for smart two-dimensional antennas. Smart antennas employ arrays of low gain antennas connected to a combining/beamforming network. Smart antennas can provide enhanced coverage through range extension, hole filling and improved building penetration. By improving transmission and reception at the base station, the tolerable path losses can be increased whereby the range of the base station can be improved. A first aspect of the invention thus provides a method of generating low sidelobe beampatterns for 2-dimensional arrays. A further aspect addresses the feedback signalling techniques which are presently being considered by standard bodies for four antennas in large arrays. The invention is suitable for CDMA wireless cellular systems, as presently determined for third generation cellular wireless networks, and other wireless systems such as TDMA systems and wireless LANs.
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