Adaptive antenna for use in wireless communication systems
First Claim
1. A method for providing a wireless transmit receive unit (WRTU), including a directional antenna apparatus having one or more antenna elements, directional reception of radio signals in a wireless communication system comprising:
- independently adjusting each of a plurality of phase shifters to affect directionality of received radio signals, each one of said phase shifters coupled to one of said antenna elements; and
receiving said radio signals originating from the direction of a transmitting base station, wherein the radio signals transmitted from a different direction are rejected.
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Abstract
An antenna apparatus, which can increase capacity in a cellular communication system or Wireless Local Area Network (WLAN), such as an 802.11 network, operates in conjunction with a mobile subscriber unit or client station. At least one antenna element is active and located within multiple passive antenna elements. The passive antenna elements are coupled to selectable impedance components for phase control of re-radiated RF signals. Various techniques for determining the phase of each antenna element are supported to enable the antenna apparatus to direct an antenna beam pattern toward a base station or access point with maximum gain, and, consequently, maximum signal-to-noise ratio. By directionally receiving and transmitting signals, multipath fading is greatly reduced as well as intercell interference.
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Citations
14 Claims
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1. A method for providing a wireless transmit receive unit (WRTU), including a directional antenna apparatus having one or more antenna elements, directional reception of radio signals in a wireless communication system comprising:
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independently adjusting each of a plurality of phase shifters to affect directionality of received radio signals, each one of said phase shifters coupled to one of said antenna elements; and
receiving said radio signals originating from the direction of a transmitting base station, wherein the radio signals transmitted from a different direction are rejected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless receive transmit unit (WRTU), including a directional antenna apparatus for providing directional reception of radio signals in a wireless communication system, comprising:
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said directional antenna apparatus comprising;
a plurality of antenna elements; and
a plurality of phase shifters wherein each phase shifter is coupled to a respective one of said antenna elements;
the plurality of phase shifters being configured such that they can be, independently adjusted to affect the directionality of said received radio signals;
said directional antenna apparatus receiving said radio signals originating from the direction of a transmitting base station, wherein radio signals received from a different direction are rejected. - View Dependent Claims (12, 13, 14)
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Specification