Adaptive multi-beam system
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United States of America Patent
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Issued Date -
Dec 13, 2007
app pub date -
Apr 6, 2007
filing date -
Apr 7, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A system and method of providing an adaptive multi-beam capability to a wireless base transceiver station is disclosed. The system comprises a plurality of transmit and receive antenna arrays and a plurality of static beamformers to form a limited number of beams. The beam data is reduced to digital baseband form whereupon it is digitally beamformed using a set of adaptive beamforming weights generated having regard to the form and content of the data and the environment. Such form and content information is obtained directly or indirectly from the base transceiver station. The weights are calculated using an average power function derived from a correlation of the beam data with a reference signal that mimics the training sequence assigned to the base transceiver station. Because the average power does not vary widely from frame to frame, the weights derived from the uplink direction may be reapplied in the downlink direction. Specific provision is made for data packets, where downlink packets may contain control information intended for broadcast to all subscribers.
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