Antenna Selection Scheme for Multiple Antennae

US 20090073062A1
Filed: 09/17/2007
Published: 03/19/2009
Est. Priority Date: 09/17/2007
Status: Active Grant

First Claim

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1. A method to select among a plurality of antennae based on at least one quality indicator, comprising:

monitoring at least one antenna of a plurality of antennae during a fraction of at least one preamble period of a frame to derive at least one quality indicator corresponding to the at least one antenna;

storing the at least one quality indicator derived from monitoring the at least one antenna during the fraction of at least one preamble period of a frame; and

selectively switching to a selected antenna of the plurality of antennae after a number of frames, based on the at least one quality indicator corresponding to the at least one antenna.

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Abstract

A method and system to select an antenna from a plurality of antennae used for wireless communications. A first embodiment is a method to select an antenna from a plurality of antennae. The method includes monitoring at least one antenna during a fraction of at least one preamble period of a frame to derive at least one quality indicator corresponding to the antenna; storing the quality indicator derived from monitoring the antenna during the fraction of the preamble period of a frame; and selectively switching to a selected antenna after a number of frames, based on the quality indicator. A second embodiment is another method to select an antenna from a plurality of antennae. These embodiments can be applied in several wireless communication applications using multiple antennae including, but not limited to, WiMAX applications.

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20 Claims

1. A method to select among a plurality of antennae based on at least one quality indicator, comprising:
- monitoring at least one antenna of a plurality of antennae during a fraction of at least one preamble period of a frame to derive at least one quality indicator corresponding to the at least one antenna;
  
  storing the at least one quality indicator derived from monitoring the at least one antenna during the fraction of at least one preamble period of a frame; and
  
  selectively switching to a selected antenna of the plurality of antennae after a number of frames, based on the at least one quality indicator corresponding to the at least one antenna.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- - 2. The method of claim 1, wherein the number of frames equals or exceeds the number of antennae in the plurality of antennae.
  - 3. The method of claim 1, wherein the number of frames equals a nonzero integer multiplied by the number of antennae in the plurality of antennae.
  - 4. The method of claim 1, wherein the number of frames equals the number of antennae in the plurality of antennae.
  - 5. The method of claim 1, wherein the number of frames is determined by performing a round-robin sequence of monitoring each antenna of the plurality of antennae for one or more frames.
  - 6. The method of claim 1, wherein the monitoring of at least one antenna of the plurality of antennae monitors the at least one antenna during a fraction of at least one preamble period during a plurality of frames before selectively switching to a selected antenna.
  - 7. The method of claim 1, wherein the at least one quality indicator of the selected antenna must exceed the at least one quality indicator corresponding to each antenna of the remaining antennae of the plurality of antenna by a pre-defined quality indicator margin, before selectively switching to the selected antenna.
  - 8. The method of claim 1, wherein the selectively switching to a selected antenna occurs during a portion of a preamble period of one frame.
  - 9. The method of claim 1, wherein the plurality of antennae is used in wideband applications substantially compatible with IEEE 802.16e requirements.

10. A method to select among a plurality of antennae based on at least one quality indicator, comprising:
- monitoring at least one antenna of a plurality of antennae during a fraction of at least one preamble period of a frame to derive at least one quality indicator corresponding to the at least one antenna;
  
  storing the at least one quality indicator derived from monitoring the at least one antenna during the fraction of at least one preamble period of a frame;
  
  comparing the at least one quality indicator corresponding to each antenna of the plurality of antennae; and
  
  selectively switching to a selected antenna of the plurality of antennae after a number of frames, based on the at least one quality indicator.
- View Dependent Claims (11, 12, 13, 14)
- - 11. The method of claim 10, wherein the number of frames equals or exceeds the number of antennae in the plurality of antennae.
  - 12. The method of claim 10, wherein the number of frames equals a nonzero integer multiplied by the number of antennae in the plurality of antennae.
  - 13. The method of claim 10, wherein the number of frames equals the number of antennae in the plurality of antennae.
  - 14. The method of claim 10, wherein the number of frames is determined by performing a round-robin sequence of monitoring each antenna of the plurality of antennae for one or more frames.

15. A method to select among a plurality of antennae based on a quality indicator, comprising:
- monitoring an antenna of a plurality of antennae during a fraction of a preamble period of a frame to derive a quality indicator corresponding to the antenna;
  
  storing the quality indicator derived from monitoring the antenna during the fraction of the preamble period of a frame;
  
  comparing the quality indicator corresponding to a first quality indicator of a first antenna of the plurality of antennae; and
  
  selectively switching from the first antenna to a selected antenna of the plurality of antennae after a number of frames, based on the quality indicator corresponding to the selected antenna.
- View Dependent Claims (16, 17, 18, 19, 20)
- - 16. The method of claim 15, wherein the number of frames equals the number of antennae in the plurality of antennae.
  - 17. The method of claim 15, wherein the number of frames is determined by performing a round-robin sequence of monitoring each antenna of the plurality of antennae for one or more frames.
  - 18. The method of claim 15, wherein the quality indicator of the selected antenna must exceed the quality indicator corresponding to each antenna of the remaining antennae of the plurality of antenna by a pre-defined quality indicator margin, before selectively switching to the selected antenna.
  - 19. The method of claim 15, wherein the selectively switching to a selected antenna occurs during a portion of a preamble period of one frame.
  - 20. The method of claim 15, wherein the plurality of antennae is used in wideband applications substantially compatible with IEEE 802.16e requirements.

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Current Assignee
Frequency Systems, LLC (Brian Yates)
Original Assignee
Apacewave Technologies Incorporated
Inventors
Shen, Jun, Tang, XiangGuo

Granted Patent

US 8,417,205 B2
Time in Patent Office

Days
Field of Search
US Class Current

343/703
CPC Class Codes

H04B 7/0608 Antenna selection according...

Antenna Selection Scheme for Multiple Antennae

First Claim

5 Assignments

0 Petitions

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Abstract

17 Citations

20 Claims

Specification

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Antenna Selection Scheme for Multiple Antennae

First Claim

5 Assignments

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0 Petitions

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Accused Products

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Abstract

17 Citations

20 Claims

Specification

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Solutions

Use Cases

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