Interference management in a wireless communication system using frequency selective transmission

• US 8,948,095 B2
• Filed: 11/24/2008
• Issued: 02/03/2015
• Est. Priority Date: 11/27/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Black, Peter J., Fan, Mingxi, Vanichpun, Sarut, Yavuz, Mehmet
• Primary Examiner(s): Pham, Chi H
• Assistant Examiner(s): HYUN, SOON D
• Application Number:
  US12/276,906
• Publication Number:
  US 20090252099A1
• Time in Patent Office: 2,262 Days
• US Class Current: 370/329
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

Interference that occurs during wireless communication may be managed by determination of a selected transmit waveform exhibiting a preferred channel quality. A method, apparatus and medium of communication determine a transmit waveform from among a plurality of allocated waveforms of an unplanned access point to an associated access terminal. The transmit waveform exhibiting a highest channel quality with an associated access terminal over others of the plurality of allocated waveforms is determined. Signals are transmitted according to the transmit waveform from the unplanned access point to the associated access terminal.

Claims

1. A method of communication, comprising:

determining a transmit waveform from among a plurality of allocated waveforms of an unplanned access point to an associated access terminal, the transmit waveform exhibiting a highest channel quality with the associated access terminal over others of the plurality of allocated waveforms, wherein the determining comprises;

determining a default waveform as the transmit waveform from among the plurality of allocated waveforms; and

designating a different one of the plurality of allocated waveforms as the transmit waveform when one of the plurality of allocated waveforms exhibits a higher channel quality; and

transmitting signals according to the transmit waveform from the unplanned access point to the associated access terminal.

2. The method of claim 1, wherein determining comprises:

testing the channel quality with the associated access terminal of each of the plurality of allocated waveforms of the unplanned access point; and

selecting the transmit waveform as one from among the plurality of allocated waveforms exhibiting the highest channel quality.

3. The method of claim 2, wherein testing comprises for each of the plurality of allocated waveforms:

transmitting a signal to the associated access terminal using one of the plurality of allocated waveforms; and

receiving an indication of channel quality of the signal from the associated access terminal.

4. The method of claim 1, wherein the plurality of allocated waveforms are derived from coefficients of a digital Fourier transform matrix.

5. The method of claim 1, further comprising repeating determining a transmit waveform based on an update period.

6. The method of claim 1, further comprising repeating determining a transmit waveform based on deviation of a current channel quality by a channel quality degradation threshold from the highest channel quality.

7. The method of claim 1, wherein the transmit waveform is formed from coefficients of an N-tap channel filter.

8. The method of claim 7, wherein each of the coefficients are derived from a specific row in an N×

N discrete Fourier transform matrix.

9. The method of claim 1, wherein the plurality of waveforms are derived from coefficients of a digital Fourier transform matrix, wherein the transmit waveform exhibits a highest channel quality in the presence of interference with the associated access terminal over others of the plurality of allocated waveforms, and wherein channel quality with the associated access terminal is tested for each of the plurality of allocated waveforms.

10. The method of claim 1, wherein determining the default waveform further comprises determining according to a defined selection process including a randomization process or an assignment process.

11. An apparatus for communication, comprising:

an interference controller configured to;

determine a transmit waveform from among a plurality of allocated waveforms of an unplanned access point to an associated access terminal, the transmit waveform exhibiting a highest channel quality with the associated access terminal over others of the plurality of allocated waveforms, wherein the interference controller is further configured to;

determine a default waveform as the transmit waveform from among the plurality of allocated waveforms; and

designate a different one of the plurality of allocated waveforms as the transmit waveform when one of the plurality of allocated waveforms exhibits a higher channel quality; and

a communication controller configured to transmit signals according to the transmit waveform from the unplanned access point to the associated access terminal.

12. The apparatus of claim 11, wherein the inference controller is further configured to test the channel quality with the associated access terminal of each of the plurality of allocated waveforms of the unplanned access point, and select the transmit waveform as one from among the plurality of allocated waveforms exhibiting the highest channel quality.

13. The apparatus of claim 12, wherein the communication controller is further configured to, for each of the plurality of allocated waveforms, transmit a signal to the associated access terminal using one of the plurality of allocated waveforms, and receive an indication of channel quality of the signal from the associated access terminal.

14. The apparatus of claim 11, wherein the plurality of allocated waveforms are derived from coefficients of a digital Fourier transform matrix.

15. The apparatus of claim 11, wherein the interference controller is further configured to repeat determining a transmit waveform based on an update period.

16. The apparatus of claim 11, wherein the interference controller is further configured to repeat determining a transmit waveform based on deviation of a current channel quality by a channel quality degradation threshold from the highest channel quality.

17. The apparatus of claim 11, wherein the transmit waveform is formed from coefficients of an N-tap channel filter.

18. The apparatus of claim 17, wherein each of the coefficients are derived from a specific row in an N×

N discrete Fourier transform matrix.

19. The apparatus of claim 11, wherein the plurality of waveforms are derived from coefficients of a digital Fourier transform matrix, wherein the transmit waveform exhibits a highest channel quality in the presence of interference with the associated access terminal over others of the plurality of allocated waveforms, and wherein channel quality with the associated access terminal is tested for each of the plurality of allocated waveforms.

20. The apparatus of claim 11, wherein the interference controller is further configured to determine the default waveform according to a defined selection process including a randomization process or an assignment process.

21. An apparatus for communication, comprising:

means for determining a transmit waveform from among a plurality of allocated waveforms of an unplanned access point to an associated access terminal, the transmit waveform exhibiting a highest channel quality with the associated access terminal over others of the plurality of allocated waveforms, wherein the means for determining comprises;

means for determining a default waveform as the transmit waveform from among the plurality of allocated waveforms; and

means for designating a different one of the plurality of allocated waveforms as the transmit waveform when one of the plurality of allocated waveforms exhibits a higher channel quality; and

means for transmitting signals according to the transmit waveform from the unplanned access point to the associated access terminal.

22. The apparatus of claim 21, wherein the means for determining comprises:

means for testing the channel quality with the associated access terminal of each of the plurality of allocated waveforms of the unplanned access point; and

means for selecting the transmit waveform as one from among the plurality of allocated waveforms exhibiting the highest channel quality.

23. The apparatus of claim 22, wherein the means for testing comprises for each of the plurality of allocated waveforms:

means for transmitting a signal to the associated access terminal using one of the plurality of allocated waveforms; and

means for receiving an indication of channel quality of the signal from the associated access terminal.

24. The apparatus of claim 21, wherein the plurality of allocated waveforms are derived from coefficients of a digital Fourier transform matrix.

25. The apparatus of claim 21, further comprising means for repeating determining a transmit waveform based on an update period.

26. The apparatus of claim 21, further comprising means for repeating determining a transmit waveform based on deviation of a current channel quality by a channel quality degradation threshold from the highest channel quality.

27. The apparatus of claim 21, wherein the transmit waveform is formed from coefficients of an N-tap channel filter.

28. The apparatus of claim 27, wherein each of the coefficients are derived from a specific row in an N×

N discrete Fourier transform matrix.

29. The apparatus of claim 21, wherein the plurality of waveforms are derived from coefficients of a digital Fourier transform matrix, wherein the transmit waveform exhibits a highest channel quality in the presence of interference with the associated access terminal over others of the plurality of allocated waveforms, and wherein channel quality with the associated access terminal is tested for each of the plurality of allocated waveforms.

30. The apparatus of claim 21, wherein the means for determining the default waveform further comprises means for determining according to a defined selection process including a randomization process or an assignment process.

31. A computer-program product, comprising:

a non-transitory computer-readable medium comprising codes for causing a computer to;

determine a transmit waveform from among a plurality of allocated waveforms of an unplanned access point to an associated access terminal, the transmit waveform exhibiting a highest channel quality with the associated access terminal over others of the plurality of allocated waveforms, including to;

determine a default waveform as the transmit waveform from among the plurality of allocated waveforms; and

designate a different one of the plurality of allocated waveforms as the transmit waveform when one of the plurality of allocated waveforms exhibits a higher channel quality; and

transmit signals according to the transmit waveform from the unplanned access point to the associated access terminal.

32. The computer-program product of claim 31, wherein the codes for causing the computer to determine comprise codes for causing the computer to:

test the channel quality with the associated access terminal of each of the plurality of allocated waveforms of the unplanned access point; and

select the transmit waveform as one from among the plurality of allocated waveforms exhibiting the highest channel quality.

33. The computer-program product of claim 32, wherein the codes for causing the computer to test comprise codes for causing the computer for each of the plurality of allocated waveforms to:

transmit a signal to the associated access terminal using one of the plurality of allocated waveforms; and

receive an indication of channel quality of the signal from the associated access terminal.

34. The computer-program product of claim 31, wherein the plurality of allocated waveforms are derived from coefficients of a digital Fourier transform matrix.

35. The computer-program product of claim 31, further comprise codes for causing the computer to repeat determining a transmit waveform based on an update period.

36. The computer-program product of claim 31, further comprising codes for causing the computer to repeat determining a transmit waveform based on deviation of a current channel quality by a channel quality degradation threshold from the highest channel quality.

37. The computer-program product of claim 31, wherein the transmit waveform is formed from coefficients of an N-tap channel filter.

38. The computer-program product of claim 37, wherein each of the coefficients are derived from a specific row in an N×

N discrete Fourier transform matrix.

39. The computer-program product of claim 31, wherein the plurality of waveforms are derived from coefficients of a digital Fourier transform matrix, wherein the transmit waveform exhibits a highest channel quality in the presence of interference with the associated access terminal over others of the plurality of allocated waveforms, and wherein channel quality with the associated access terminal is tested for each of the plurality of allocated waveforms.

40. The computer program product of claim 31, wherein the code for determining the default waveform further comprises code for determining according to a defined selection process including a randomization process or an assignment process.