Adaptive antenna for use in same frequency networks
First Claim
1. An antenna apparatus for use with a subscriber unit in a wireless communication system, the antenna apparatus comprising:
- a plurality of antenna elements;
a like plurality of adjustable phase shifters, each respectively coupled to one of the antenna elements;
the phase shifters being independently adjustable to affect the phase of respective reverse link signals to be transmitted from the subscriber unit on each of the antenna elements, to form a composite beam which may be positionally directed towards a base station; and
wherein an optimal phase setting for each of the phase shifters is determined from parameters of a received pilot signal transmitted from the base station.
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Accused Products
Abstract
An antenna apparatus which can increase capacity in a cellular communication system. The antenna operates in conjunction with a mobile subscriber unit and provides a plurality of antenna elements, each coupled to a respective programmable phase shifter. The phase of each antenna element is programmed for optimum reception during, for example, an idle mode which receives a pilot signal. The antenna array creates a beamformer for signals to be transmitted from the mobile subscriber unit, and a directional receiving array to more optimally detect and receive signals transmitted from the base station. By directionally receiving and transmitting signals, multipath fading is greatly reduced as well as intercell interference. Various techniques for determining the proper phase of each antenna element are accommodated.
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Citations
14 Claims
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1. An antenna apparatus for use with a subscriber unit in a wireless communication system, the antenna apparatus comprising:
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a plurality of antenna elements; a like plurality of adjustable phase shifters, each respectively coupled to one of the antenna elements; the phase shifters being independently adjustable to affect the phase of respective reverse link signals to be transmitted from the subscriber unit on each of the antenna elements, to form a composite beam which may be positionally directed towards a base station; and
wherein an optimal phase setting for each of the phase shifters is determined from parameters of a received pilot signal transmitted from the base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification