Repeater techniques for multiple input multiple output utilizing beam formers

• US 8,774,079 B2
• Filed: 10/26/2007
• Issued: 07/08/2014
• Est. Priority Date: 10/26/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Proctor, James Arthur Jr., Otto, James C., Gainey, Kenneth Marvin
• Primary Examiner(s): BLANTON, JOHN D
• Application Number:
  US12/439,018
• Publication Number:
  US 20090323582A1
• Time in Patent Office: 2,447 Days
• Field of Search: None
• US Class Current: 370/315
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence

Abstract

A repeater for a wireless communication network includes a first reception antenna for receiving a reception signal on a first path from one of an access point, another repeater or a wireless station device; a second reception antenna for receiving the reception signal on a second path; a reception weighting circuit for applying first and second weights to the reception signal to generate a first weighted reception signal and a second weighted reception signal; a signal combiner for combining the first and second weighted reception signals according to various mathematical combinations to generate a plurality of combined reception signals; and a transmission antenna for transmitting a transmission signal corresponding to one of the combined reception signals to one of the access point, the another repeater or the wireless station device.

Claims

1. A repeater for a wireless communication network comprising:

a first reception antenna for receiving a reception signal on a first path from one of an access point, another repeater or a wireless station device;

a second reception antenna for receiving the reception signal on a second path from the one of the access point, the another repeater or the wireless station device;

a reception weighting circuit for applying first and second weights to the reception signal received on the first and second paths to generate a first weighted reception signal and a second weighted reception signal;

a signal combiner for combining the first and second weighted reception signals according to various mathematical combinations to generate a plurality of combined reception signals; and

a transmission antenna for transmitting a transmission signal corresponding to one of the combined reception signals to one of the access point, the another repeater or the wireless station device.

2. The repeater of claim 1, wherein the first reception antenna is initially set to receive the reception signal on the first path via a first frequency channel and the second reception antenna is initially set to receive the reception signal on the second path via a second frequency channel.

3. The repeater of claim 2, further comprising:

a signal detection device coupled to the first reception antenna and the second reception antenna, the signal detection device configured to detect a presence of the reception signal on one of the first reception antenna and the second reception antenna; and

a control circuit coupled to the signal detection device and the first and second reception antennas, the control circuit configured to switch the first reception antenna to receive the reception signal on the second frequency channel or to switch the second reception antenna to receive the reception signal on the first frequency channel in accordance with the detection of the signal detection device.

4. The repeater of claim 3, further comprising:

a digital filter for filtering the one of the combined reception signals, wherein the signal combiner is configured to store a first sample of the reception signal received at the first reception antenna and a second sample of the reception signal received at the second reception antenna and to load one of the first sample or the second sample into the digital filter in accordance with the one of the first reception antenna and the second reception antenna on which the signal detection detected the presence of the reception signal, wherein the digital filter filters the one of the combined reception signals in accordance with the one of the first sample or the second sample.

5. The repeater of claim 1, wherein the first and second reception antennas are first and second patch antennas and the transmission antenna is a dipole antenna.

6. The repeater of claim 1, wherein the first and second reception antennas are first and second dipole antennas and the transmission antenna is a patch antenna.

7. The repeater of claim 1, further comprising a transmission weight controller for applying a weight to the one of the combined reception signals based upon predetermined signal metrics to generate the transmission signal.

8. The repeater of claim 1, wherein the reception weighting circuit includes one of a variable phase shifter for adjusting a phase of the one of the first and second reception signals and a variable attenuator for adjusting a gain of the one of the first and second reception signals.

9. The repeater of claim 1, wherein the first and second paths have different angles of arrivals.

10. The repeater of claim 1, wherein the first reception antenna is configured to monitor a first frequency and the second reception antenna is configured to monitor a second frequency until the reception signal is detected by the first reception antenna on the first path over the first frequency, after which the second reception antenna retunes from the second frequency to the first frequency in response to the detection so as to receive the reception signal on the second path over the first frequency.

11. The repeater of claim 1, wherein the transmission signal corresponds to a given combined reception signal from the plurality of combined reception signals that is determined to most accurately reconstruct the reception signal.

12. The repeater of claim 11, wherein the reconstruction accuracy of each of the plurality of combined reception signals is gauged based on signal strength, signal-to-noise ratio (SNR) and/or delay spread.

13. A repeater for a wireless communication network, the repeater including first and second reception antennas for receiving a first reception signal on first and second paths, and first and second transmission antennas, the repeater comprising:

a reception weighting circuit for applying first and second weights to the reception signal received on first and second reception paths to generate a first weighted reception signal and a second weighted reception signal;

a signal combiner for combining the first and second weighted reception signals according to various mathematical combinations to generate a plurality of combined reception signals and outputting a predetermined one of the plurality of combined reception signals;

a splitter for splitting the predetermined one of the plurality of combined reception signals into first and second transmission signals; and

a transmission weighting circuit for applying a transmission weight to the first and second transmission signals to generate first and second weighted transmission signals,

wherein the first and second transmission antennas transmit the first and second weighted transmission signals.

14. The repeater of claim 13, wherein the first and second paths have different angles of arrivals.

15. The repeater of claim 13, further comprising a controller for controlling the reception weighting circuit in accordance with a measured value of a self-generated signal transmitted over the first and second transmission antennas.

16. The repeater of claim 13, wherein the predetermined one of the plurality of combined reception signals corresponds to a given combined reception signal from the plurality of combined reception signals that is determined to most accurately reconstruct the reception signal.

17. The repeater of claim 16, wherein the reconstruction accuracy of each of the plurality of combined reception signals is gauged based on signal strength, signal-to-noise ratio (SNR) and/or delay spread.

18. A repeater for a wireless communication network, the repeater including first and second receivers coupled to first and second reception antennas for receiving a plurality of multiple in multiple out (MIMO) signal streams on different paths, and first and second transmitters coupled to first and second transmission antennas, the repeater comprising:

a signal combiner for combining the plurality of MIMO signal streams according to various mathematical combinations to generate a plurality of combined MIMO signal streams;

a weighting circuit for applying a weight to each of the plurality of MIMO signal streams to generate a plurality of weighted MIMO signal streams; and

a digital processor for determining a predominate signal stream of the weighted MIMO signal streams, wherein the predominate signal stream is transmitted on the first transmission antenna and the remaining MIMO weighted signal streams are transmitted on the second transmission antenna.

19. The repeater according to claim 18, wherein the digital processor determines the predominate signal stream based upon at least one of signal strength, signal to noise ratio, and delay spread.

20. The repeater of claim 18, wherein the predominate signal stream is selected as a given weighted MIMO stream with a highest quality metric from among the plurality of weighted MIMO signal streams.

21. The repeater of claim 20, wherein a quality metric for each of the plurality of weighted MIMO streams is gauged based on signal strength, signal-to-noise ratio (SNR) and/or delay spread.

22. A method of operating a repeater within a wireless communication network, comprising:

receiving a reception signal on a first path from one of an access point, another repeater or a wireless station device;

receiving the reception signal on a second path from the one of the access point, the another repeater or the wireless station device;

applying first and second weights to the reception signal received on the first and second paths to generate a first weighted reception signal and a second weighted reception signal;

combining the first and second weighted reception signals according to various mathematical combinations to generate a plurality of combined reception signals; and

transmitting a transmission signal corresponding to one of the combined reception signals to one of the access point, the another repeater or the wireless station device.

23. A method of operating a repeater within a wireless communication network, comprising:

applying first and second weights to a reception signal received on first and second reception paths to generate a first weighted reception signal and a second weighted reception signal;

combining the first and second weighted reception signals according to various mathematical combinations to generate a plurality of combined reception signals and outputting a predetermined one of the plurality of combined reception signals;

splitting the predetermined one of the plurality of combined reception signals into first and second transmission signals;

applying a transmission weight to the first and second transmission signals to generate first and second weighted transmission signals; and

transmitting the first and second weighted transmission signals.

24. A method of operating a repeater within a wireless communication network, comprising:

combining a plurality of multiple in multiple out (MIMO) signal streams according to various mathematical combinations to generate a plurality of combined MIMO signal streams;

applying a weight to each of the plurality of MIMO signal streams to generate a plurality of weighted MIMO signal streams; and

determining a predominate signal stream of the weighted MIMO signal streams;

transmitting the predominate signal stream with a first transmission antenna; and

transmitting the remaining MIMO weighted signal streams on a second transmission antenna.

25. A repeater within a wireless communication network, comprising:

means for receiving a reception signal on a first path from one of an access point, another repeater or a wireless station device;

means for receiving the reception signal on a second path from the one of the access point, the another repeater or the wireless station device;

means for applying first and second weights to the reception signal received on the first and second paths to generate a first weighted reception signal and a second weighted reception signal;

means for combining the first and second weighted reception signals according to various mathematical combinations to generate a plurality of combined reception signals; and

means for transmitting a transmission signal corresponding to one of the combined reception signals to one of the access point, the another repeater or the wireless station device.

26. A repeater within a wireless communication network, comprising:

means for applying first and second weights to a reception signal received on first and second reception paths to generate a first weighted reception signal and a second weighted reception signal;

means for combining the first and second weighted reception signals according to various mathematical combinations to generate a plurality of combined reception signals and outputting a predetermined one of the plurality of combined reception signals;

means for splitting the predetermined one of the plurality of combined reception signals into first and second transmission signals;

means for applying a transmission weight to the first and second transmission signals to generate first and second weighted transmission signals; and

means for transmitting the first and second weighted transmission signals.

27. A repeater within a wireless communication network, comprising:

means for combining a plurality of multiple in multiple out (MIMO) signal streams according to various mathematical combinations to generate a plurality of combined MIMO signal streams;

means for applying a weight to each of the plurality of MIMO signal streams to generate a plurality of weighted MIMO signal streams; and

means for determining a predominate signal stream of the weighted MIMO signal streams;

means for transmitting the predominate signal stream with a first transmission antenna; and

means for transmitting the remaining MIMO weighted signal streams on a second transmission antenna.

28. A non-transitory computer-readable medium containing instructions stored thereon, which, when executed by a repeater within a wireless communication network, cause the repeater to perform operations, comprising:

at least one instruction for receiving a reception signal on a first path from one of an access point, another repeater or a wireless station device;

at least one instruction for receiving the reception signal on a second path from the one of the access point, the another repeater or the wireless station device;

at least one instruction for applying first and second weights to the reception signal received on the first and second paths to generate a first weighted reception signal and a second weighted reception signal;

at least one instruction for combining the first and second weighted reception signals according to various mathematical combinations to generate a plurality of combined reception signals; and

at least one instruction for transmitting a transmission signal corresponding to one of the combined reception signals to one of the access point, the another repeater or the wireless station device.

29. A non-transitory computer-readable medium containing instructions stored thereon, which, when executed by a repeater within a wireless communication network, cause the repeater to perform operations, comprising:

at least one instruction for applying first and second weights to a reception signal received on first and second reception paths to generate a first weighted reception signal and a second weighted reception signal;

at least one instruction for combining the first and second weighted reception signals according to various mathematical combinations to generate a plurality of combined reception signals and outputting a predetermined one of the plurality of combined reception signals;

at least one instruction for splitting the predetermined one of the plurality of combined reception signals into first and second transmission signals;

at least one instruction for applying a transmission weight to the first and second transmission signals to generate first and second weighted transmission signals; and

at least one instruction for transmitting the first and second weighted transmission signals.

30. A non-transitory computer-readable medium containing instructions stored thereon, which, when executed by a repeater within a wireless communication network, cause the repeater to perform operations, comprising:

at least one instruction for combining a plurality of multiple in multiple out (MIMO) signal streams according to various mathematical combinations to generate a plurality of combined MIMO signal streams;

at least one instruction for applying a weight to each of the plurality of MIMO signal streams to generate a plurality of weighted MIMO signal streams; and

at least one instruction for determining a predominate signal stream of the weighted MIMO signal streams;

at least one instruction for transmitting the predominate signal stream with a first transmission antenna; and

at least one instruction for transmitting the remaining MIMO weighted signal streams on a second transmission antenna.