Adaptive antenna array with programmable sensitivity

• US 7,039,363 B1
• Filed: 09/28/2001
• Issued: 05/02/2006
• Est. Priority Date: 09/28/2001
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: ArrayComm LLC (Ygomi LLC)
• Inventors: Kerr, Adam B., Da Torre, Serge Barbosa, Kasapi, Athanasios A., Trott, Mitchell D., Khoury, Peter G.
• Primary Examiner(s): Kincaid, Lester G.
• Assistant Examiner(s): Cho, Un C.
• Application Number:
  US09/967,896
• Time in Patent Office: 1,677 Days
• Field of Search: 455/13.3, 455/562.1, 455/65, 455/561, 455/67.11, 455/76, 455/101, 455/134, 455/135, 455/226, 455/230, 455/231, 455/232, 455/233, 455/254, 370/347, 370/522
• US Class Current: 455/67.11
• CPC Class Codes: H04B 7/0854 using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion

Abstract

Methods and apparatus for calculating spatial processing strategies in adaptive antenna array processing systems. Reference signal quality, intersymbol interference, data processed and received signal quality can be determined by burst type or remote device type and used to determine a synthetic signal level for use in developing a spatial processing strategy. A synthetic signal have an isotropically distributed component can be added to the antennas in the array or the diagonal elements of the received signal covariance matrix to develop uplink and downlink spatial processing strategies. Different synthetic signals at different signal levels can be used to develop different uplink and downlink spatial processing strategies. The downlink signal level can be larger than the uplink signal level. Uplink and downlink processing strategies can be developed in substantially the same way.

Claims

1. A method for calculating a spatial processing strategy in an adaptive antenna array processing system, comprising:

determining an amount of data used by the adaptive antenna array processing system to develop a spatial processing strategy;

using the amount of data to determine a signal level for a variable synthetic signal, including increasing the signal level for the variable synthetic signal as the amount of data used to develop the spatial processing decreases; and

using the variable synthetic signal at the signal level to develop the spatial processing strategy.

2. The method of claim 1, wherein the step of determining the amount of data comprises determining a burst type of a communication from a device communicating with the adaptive antenna array processing system.

3. The method of claim 1, wherein the step of determining an amount of data used by the adaptive antenna processing system comprises determining the amount of training data.

4. The method of claim 3, wherein the step of determining the amount of training data comprises determining a device type of a device communicating with the adaptive antenna array processing system.

5. A method for calculating uplink and downlink spatial processing strategies in an adaptive antenna array processing system, comprising:

determining a first signal level for a first variable synthetic signal, including determining a quality of a signal received from a device communicating with the adaptive antenna array processing system;

using the first variable synthetic signal at the first signal level to develop an uplink spatial processing strategy;

determining a second signal level for a second variable synthetic signal;

using the second variable synthetic signal at the second signal level to develop a downlink spatial processing strategy;

determining the pathloss between the device and the adaptive antenna processing system to determine the quality of the signal received from the device; and

wherein the uplink and downlink spatial processing strategies are developed in substantially the same way.

6. The method of claim 5, wherein the first variable synthetic signal and the second variable synthetic signal have the same signal waveform.

7. The method of claim 5, wherein the second signal level is larger than the first signal level.

8. The method of claim 5, further comprising measuring the strength of the signal received from the device to determine the quality of the signal received from the device.

9. The method of claim 5, wherein one or more of the steps of determining first and second signal levels comprises determining a quality of a reference signal used by the adaptive antenna array processing system.

10. The method of claim 5, wherein one or more of the steps of determining first and second signal levels comprises determining an amount of intersymbol interference in signals processed by the adaptive antenna array processing system.

11. The method of claim 5, wherein one or more of the steps of determining first and second signal levels comprises determining an amount of data used by the adaptive antenna array processing system to develop a spatial processing strategy.

12. The method of claim 5, wherein one or more of the steps of determining first and second signal levels comprises determining a burst type of a communication from a device communicating with the adaptive antenna array processing system.

13. A method for calculating a spatial processing strategy in an adaptive antenna array processing system, comprising:

determining a quality of a signal received from a device communicating with the adaptive antenna array processing system, including determining the pathloss between the device and the adaptive antenna processing system to determine the quality of the signal received from the device;

using the quality to determine a signal level for a variable synthetic signal; and

using the synthetic signal at the signal level to develop the spatial processing strategy.

14. The method of claim 13, further comprising measuring the strength of the signal received from the device to determine the quality of the signal received from the device.

15. The method of claim 13, wherein the step of using the synthetic signal at the signal level to develop the spatial processing strategy comprises adding the variable synthetic signal at the signal level to the diagonal elements of a covariance matrix made from the signals received from the device communicating with the adaptive antenna processing system.

16. The method of claim 13, wherein the step of using the synthetic signal at the signal level to develop the spatial processing strategy comprises adding the variable synthetic signal at the signal level to each of the antennas in the adaptive antenna array processing system.

17. The method of claim 13, wherein the variable synthetic signal comprises a signal having an isotropically distributed component.

18. The method of claim 13, wherein different signal levels of the variable synthetic signal are used to develop different uplink and downlink spatial processing strategies.

19. A computer program product, implemented on a machine readable medium, for calculating a spatial processing strategy in an adaptive antenna array processing system, the computer program product comprising instructions operable to cause a programmable processor to:

determine an amount of data used by the adaptive antenna array processing system to develop a spatial processing strategy;

use the amount of data to determine a signal level for a variable synthetic signal, including increase the signal level for the variable synthetic signal as the amount of data used to develop the spatial processing decreases; and

use the variable synthetic signal at the signal level to develop the spatial processing strategy.

20. The computer program product of claim 19, wherein the instruction to determine the amount of data used by the adaptive antenna array processing system comprises instructions to determine a burst type of a communication from a device communicating with the adaptive antenna array processing system.

21. The computer program product of claim 19, wherein the instruction to determine the amount of data used by the adaptive antenna array processing system comprises instructions to determine the amount of training data.

22. The computer program product of claim 21, wherein the instructions to determine the amount of training data comprise instructions to determine a device type of a device communicating with the adaptive antenna array processing system.

23. A computer program product, implemented on a machine readable medium, for calculating a spatial processing strategy in an adaptive antenna array processing system, the computer program product comprising instructions operable to cause a programmable processor to:

determine a first signal level for a first variable synthetic signal, including determining a quality of a signal received from a device communicating with the adaptive antenna array processing system;

use the first variable synthetic signal at the first signal level to develop an uplink spatial processing strategy;

determine a second signal level for a second variable synthetic signal;

use the second variable synthetic signal at the second signal level to develop a downlink spatial processing strategy;

determine the pathless between the device and the adaptive antenna processing system to determine the quality of the signal received from the device; and

wherein the uplink and downlink spatial processing strategies are developed in substantially the same way.

24. The computer program product of claim 23, wherein the first variable synthetic signal and the second variable synthetic signal have the same signal waveform.

25. The computer program product of claim 23, wherein the second signal level is larger than the first signal level.

26. The computer program product of claim 23, further comprising instructions to measure the strength of the signal received from the device to determine the quality of the signal received from the device.

27. The computer program product of claim 23, wherein the instructions to determine one or more of the first and second signal levels comprise instructions to determine a quality of a reference signal used by the adaptive antenna array processing system.

28. The computer program product of claim 23, wherein the instructions to determine one or more of the first and second signal levels comprise instructions to determine an amount of intersymbol interference in signals processed by the adaptive antenna array processing system.

29. The computer program product of claim 23, wherein the instructions to determine one or more of the first and second signal levels comprise instructions to determine an amount of data used by the adaptive antenna array processing system to develop a spatial processing strategy.

30. The computer program product of claim 23, wherein the instructions to determine one or more of the first and second signal levels comprise instructions to determine a burst type of a communication from a device communicating with the adaptive antenna array processing system.

31. A computer program product, implemented on a machine readable medium, for calculating a spatial processing strategy in an adaptive antenna array processing system, the computer program product comprising instructions operable to cause a programmable processor to:

determine a quality of a signal received from a device communicating with the adaptive antenna array processing system, including determine the pathloss between the device and the adaptive antenna processing system to determine the quality of the signal received from the device;

use the quality to determine a signal level for a variable synthetic signal; and

use the synthetic signal at the signal level to develop the spatial processing strategy.

32. The computer program product of claim 31, further comprising instructions to measure the strength of the signal received from the device to determine the quality of the signal received from the device.

33. The computer program product of claim 31, wherein the instructions to use the synthetic signal at the signal level to develop the spatial processing strategy comprise instructions to add the variable synthetic signal at the signal level to the diagonal elements of a covariance matrix made from the signals received from the device communicating with the adaptive antenna processing system.

34. The computer program product of claim 31, wherein the instructions to use the synthetic signal at the signal level to develop the spatial processing strategy spatial processing strategy comprise instructions to add the variable synthetic signal at the signal level to each of the antennas in the adaptive antenna array processing system.

35. The computer program product of claim 31, wherein the variable synthetic signal comprises a signal having an isotropically distributed component.

36. The computer program product of claim 31, wherein different signal levels of the variable synthetic signal are used to develop different uplink and downlink spatial processing strategies.