Wireless repeater

• US 7,697,958 B2
• Filed: 08/15/2005
• Issued: 04/13/2010
• Est. Priority Date: 08/16/2004
• Status: Active Grant

• Current Assignee: Farrokh Mohamadi
• Original Assignee: Farrokh Mohamadi
• Inventors: Mohamadi, Farrokh
• Primary Examiner(s): Nguyen; Duc
• Assistant Examiner(s): AKINYEMI, AJIBOLA A
• Application Number:
  US11/203,696
• Publication Number:
  US 20060040615A1
• Time in Patent Office: 1,702 Days
• Field of Search: 455/562.1
• US Class Current: 455/562.1
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/0837 using pre-detection combining H04B7/0868 takes precedence
• CPC Class Codes: H04B 7/1555 Selecting relay station antenna mode, e.g. selecting omnidirectional -, directional beams, selecting polarizations

Abstract

In one embodiment, a beamforming RF repeater includes: a beamforming controller; a first array of antennas organized into a plurality of first sub-arrays; a plurality of first RF combiner and decombiner circuits corresponding to the plurality of first sub-arrays, wherein each first RF combiner and decombiner circuit is configured to phase shift in the RF domain a received RF signal from the corresponding first sub-array according to a first beamforming command from the beamforming controller such that a first combined signal formed from the phase-shifted signals from the plurality of first RF combiner and decombiner circuits is received in a first desired beam direction; a second array of antennas organized into a plurality of second sub-arrays; and a plurality of second RF combiner and decombiner circuits corresponding to the plurality of second sub-arrays, wherein each second RF combiner and decombiner circuit is configured to phase shift in the RF domain the first combined signal according to a second beamforming command from the beamforming controller such that a transmitted signal from the second array of antennas is transmitted in a second desired beam direction. Because the beamforming is in the RF domain, the beamforming controller need not demodulate the repeated RF signal, thereby avoiding the necessity of any baseband processing.

Claims

1. A beamforming RF repeater, comprising:

a beamforming controller;

a first array of antennas organized into a plurality of first sub-arrays;

a plurality of first RF combiner and decombiner circuits corresponding to the plurality of first sub-arrays, each first RF combiner and decombiner circuit receiving an RF signal from the corresponding first sub-array of antennas,

a plurality of first power detectors corresponding to the plurality of first RF combiner and decombiner circuits, each first power detector configured to determine a power of the received RF signal in the corresponding first RF combiner and decombiner circuit, the beamforming controller determining a first beamforming command responsive to the measured powers from the first power detectors, wherein each first RF combiner and decombiner circuit is configured to phase shift in the RF domain the received RF signal from the corresponding first sub-array according to the first beamforming command from the beamforming controller such that a first combined signal formed from the phase-shifted signals from the plurality of first RF combiner and decombiner circuits is received in a first desired beam direction;

a second array of antennas organized into a plurality of second sub-arrays; and

a plurality of second RF combiner and decombiner circuits corresponding to the plurality of second sub-arrays, wherein each second RF combiner and decombiner circuit is configured to phase shift in the RF domain the first combined signal according to a second beamforming command from the beamforming controller such that a transmitted signal from the second array of antennas is transmitted in a second desired beam direction.

2. The beamforming RF repeater of claim 1, wherein each second RF combiner and decombiner circuit is configured to phase shift in the RF domain a received RF signal from the corresponding second sub-array according to the second beamforming command such that a second combined signal formed from the phase-shifted signals from the plurality of second RF combiner and decombiner circuits is received in the second desired beam direction, and wherein each first RF combiner and decombiner circuit is configured to phase shift in the RF domain the second combined signal according to the first beamforming command such that a transmitted signal from the first array of antennas is transmitted in the first desired beam direction.

3. The beamforming repeater of claim 2, wherein each first and second RF combiner and decombiner circuit includes only a single phase shifter such that only half-duplex operation is enabled.

4. The beamforming controller of claim 3, wherein each first and second RF combiner and decombiner circuit includes an RF switch having a receive and transmit configuration corresponding to the half-duplex operation.

5. The beamforming repeater of claim 2, wherein each first and second RF combiner and decombiner circuit includes a phase shifter for its received signal and a phase shifter for its transmitted signal such that a full-duplex operation is enabled.

6. The beamforming repeater of claim 2, further comprising a second power detector corresponding to each second RF combiner and decombiner circuit, each second power detector configured to determine a power of the received RF signal in the corresponding second RF combiner and decombiner circuit, the beamforming controller determining the second beamforming command responsive to the measured powers from the second power detectors.

7. The beamforming repeater of claim 2, wherein the beamforming controller is implemented in a field programmable gate array.

8. The beamforming repeater of claim 2, wherein the second combined signal couples to the plurality of first RF combiner and decombiner circuits without any baseband processing.

9. The beamforming repeater of claim 2, further comprising a baseband processor configured to process the second combined signal.

10. The beamforming repeater of claim 1, wherein the first combined signal couples to the plurality of second RF combiner and decombiner circuits without any baseband processing.

11. The beamforming repeater of claim 1, further comprising a baseband processor configured to process the first combined signal.

12. The beamforming repeater of claim 1, further comprising a weight coupled to the first and second arrays, wherein the beamforming repeater is contained within a package such that the weight orients the first and second arrays vertically with respect to the ground.

13. The beamforming repeater of claim 1, wherein the package is substantially spherical.

14. The beamforming repeater of claim 13, wherein the weight is substantially hemispherical.