Systems and methods for parallel signal cancellation

• US 9,544,044 B2
• Filed: 12/13/2010
• Issued: 01/10/2017
• Est. Priority Date: 09/20/2002
• Status: Active Grant

• Current Assignee: III Holdings 1, LLC
• Original Assignee: III Holdings 1, LLC
• Inventors: Narayan, Anand P., Olson, Eric S., Thomas, John K.
• Primary Examiner(s): Aghdam, Freshteh N
• Application Number:
  US12/966,931
• Publication Number:
  US 20110096767A1
• Time in Patent Office: 2,220 Days
• Field of Search: 375/346, 375/130, 375/316, 375/324, 455/63.1, 455/67.13, 455/501, 455/14.2, 455/222, 455/278.1, 455/296
• US Class Current: 1/1
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04B 1/1081 Reduction of multipath noise by equalising H04B7/005
• CPC Class Codes: H04B 1/126 having multiple inputs, e.g. auxiliary antenna for receiving interfering signal aerials in general H01Q
• CPC Class Codes: H04B 1/7105 Joint detection techniques, e.g. linear detectors
• CPC Class Codes: H04B 1/7107 Subtractive interference cancellation
• CPC Class Codes: H04B 1/7117 Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
• CPC Class Codes: H04B 1/712 Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
• CPC Class Codes: H04B 2001/1045 Adjacent-channel interference
• CPC Class Codes: H04B 2201/70719 CDMA2000
• CPC Class Codes: H04B 2201/70979 Fat finger issues in RAKE receivers
• CPC Class Codes: H04B 7/0678 using different spreading codes between antennas code allocation H04J13/16
• CPC Class Codes: H04B 7/0891 Space-time diversity rake receivers H04B1/7115; space-time decoding H04L1/0631
• CPC Class Codes: H04J 13/0022 PN, e.g. Kronecker
• CPC Class Codes: H04J 13/20 having an orthogonal variable spreading factor [OVSF]

Abstract

The present invention provides systems and methods for parallel interference suppression. In one embodiment of the invention, a processing engine is used to substantially cancel a plurality of interfering signals within a received signal. The processing engine includes a plurality of matrix generators that are used to generate matrices, each matrix comprising elements of a unique interfering signal selected for cancellation. The processing engine also includes one or more processors that use the matrices to generate cancellation operators. A plurality of applicators applies the cancellation operators to parallel but not necessarily unique input signals to substantially cancel the interfering signals from the input signals. These input signals may include received signals, interference cancelled signals and/or PN codes.

Claims

1. A processing engine, comprising:

a plurality of matrix generators, wherein each of the plurality of matrix generators is configured for generating a matrix comprising elements representing components of a code of a different one of a plurality of interfering signals selected for suppression;

a processor communicatively coupled to the plurality of matrix generators and configured for generating a plurality of suppression operators;

a plurality of applicators, wherein each applicator is communicatively coupled to the processor and configured for applying at least one of the plurality of suppression operators to an input signal to substantially suppress at least one of the plurality of interfering signals; and

an interference selector configured for selecting at least one of the plurality of interfering signals as an input to the plurality of matrix generators, wherein the interference selector selects at least one of the plurality of interfering signals based on a pre-determined criteria including at least one of amplitude, timing offset, phase, or code sequence;

wherein the processing engine is in a receiver and wherein the processing engine further comprises a connection element configured for receiving one or more output signals from the plurality of applicators and for selecting one or more of the one or more output signals as inputs to one or more processing fingers of the receiver;

wherein the connection element comprises one or more selectors configured for receiving one or more of the output signals and for selecting one or more of the output signals as inputs to one or more of the processing fingers;

wherein the output signals are interference suppressed signals; and

wherein the plurality of matrix generators are in parallel with each other.

2. The processing engine of claim 1, wherein at least one of the one or more selectors is further configured for receiving a digitized signal comprising one or more Code Division Multiple Access signals as an input to one of the processing fingers.

3. The processing engine of claim 1, wherein at least one of the one or more selectors is further configured for receiving a digitized signal comprising one or more Wideband Code Division Multiple Access signals as an input to one of the processing fingers.

4. The processing engine of claim 1, wherein each of the one or more selectors is further configured for receiving a digitized signal comprising one or more Global Positioning System signals as an input to one of the processing fingers.

5. The processing engine of claim 1, wherein the interference selector is further configured for providing on-time interfering pseudo noise (PN) codes of the interfering signals to the plurality of matrix generators.

6. The processing engine of claim 1, wherein the interference selector selects the at least one of the plurality of interfering signals based on amplitude.

7. The processing engine of claim 1, wherein the interference selector selects the at least one of the plurality of interfering signals based on timing offset.

8. The processing engine of claim 1, wherein the interference selector selects the at least one of the plurality of interfering signals based on phase.

9. The processing engine of claim 1, wherein the interference selector selects the at least one of the plurality of interfering signals based on code sequence.

10. A method of suppressing interference, comprising:

generating a plurality of matrices, each of the plurality of matrices comprising elements of a different one of a plurality of interference signals selected for suppression;

generating a plurality of suppression operators from the plurality of matrices;

applying the plurality of suppression operators in parallel to an input signal to substantially suppress at least one of the interference signals;

selecting one or more output signals generated in response to applying, for assignment of the one or more output signals to one or more processing fingers of a receiver;

selecting at least one of the plurality of interference signals for input to the plurality of matrices, wherein the at least one of the plurality of interference signals is selected based on a pre-determined criteria including at least one of amplitude, timing offset, phase, or code sequence;

wherein the one or more output signals are interference suppressed signals; and

wherein the plurality of matrices are in parallel with each other.

11. The method of claim 10, further comprising providing one or more on-time interfering pseudo noise (PN) codes of the interfering signals to the matrices in response to selecting.

12. The method of claim 10, further comprising transferring the one or more output signals to the one or more processing fingers in response to selecting said output signals as input signals to the processing fingers.

13. The method of claim 10, further comprising receiving a Code Division Multiple Access signal.

14. The method of claim 10, further comprising receiving a Wideband Code Division Multiple Access signal.

15. The method of claim 10, further comprising receiving a Global Positioning System signal.

16. The method of claim 10, wherein the at least one of the plurality of interference signals is selected based on amplitude.

17. The method of claim 10, wherein the at least one of the plurality of interference signals is selected based on timing offset.

18. The method of claim 10, wherein the at least one of the plurality of interference signals is selected based on phase.

19. The method of claim 10, wherein the at least one of the plurality of interference signals is selected based on code sequence.

20. A system for suppressing interference, comprising:

means for generating a plurality of matrices, each matrix comprising elements of a different one of a plurality of interference signals selected for suppression;

means for generating a plurality of suppression operators from the plurality of matrices;

means for applying the plurality of suppression operators in parallel to an input signal to substantially suppress at least one of the plurality interference signals to form one or more output signals; and

means for selecting at least one of the plurality of interfering signals as inputs to the plurality of matrices, wherein the at least one of the plurality of interfering signals is selected based on a pre-determined criteria including at least one of amplitude, timing offset, phase, or code sequence; and

wherein the plurality of matrices are in parallel with each other.

21. The system of claim 20, further comprising means for providing on-time interfering pseudo noise (PN) codes of one or more of the plurality of interfering signals to the one or more matrices in response to selecting.

22. The system of claim 21, further comprising means for receiving a Wideband Code Division Multiple Access signal.

23. The system of claim 20, further comprising means for selecting the one or more output signals for assignment of the one or more output signals to one or more processing fingers of a receiver.

24. The system of claim 23, further comprising means for transferring one or more output signals to the one or more processing fingers in response to selecting said output signals.

25. The system of claim 23, wherein the one or more output signals are interference suppressed signals.

26. The system of claim 20, further comprising means for receiving a Code Division Multiple Access signal.

27. The system of claim 20, further comprising means for receiving a Global Positioning System signal.

28. The system of claim 20, wherein the at least one of the plurality of interfering signals is selected based on amplitude.

29. The system of claim 20, wherein the at least one of the plurality of interfering signals is selected based on timing offset.

30. The system of claim 20, wherein the at least one of the plurality of interfering signals is selected based on phase.

31. The system of claim 20, wherein the at least one of the plurality of interfering signals is selected based on code sequence.

32. A mobile handset, comprising:

a receiver configured for receiving a signal;

a processing engine communicatively coupled to the receiver and comprising

a plurality of matrix generators, wherein each of the plurality of matrix generators is configured for generating a matrix comprising elements of a different one of a plurality of interfering signals selected for suppression;

a processor communicatively coupled to the plurality of matrix generators and configured for generating a plurality of suppression operators;

a plurality of applicators, wherein each of the plurality of applicators is communicatively coupled to the processor and configured for applying at least one of the plurality of suppression operators to an input signal to substantially suppress at least one of the plurality of interfering signals; and

an interference selector configured to select at least one of the plurality of interfering signals as inputs to the plurality of matrix generators, wherein the at least one of the plurality of interfering signals is selected based on a pre-determined criteria including at least one of amplitude, timing offset, phase, or code sequence;

wherein the plurality of matrix generators are in parallel with each other.

33. The mobile handset of claim 32, wherein the processing engine further comprises a connection element configured for receiving output signals from the plurality of applicators and for selecting one or more output signals as inputs to one or more processing fingers of the receiver.

34. The mobile handset of claim 33, wherein the connection element comprises one or more selectors configured for receiving one or more output signals and for selecting one or more of the one or more output signals as inputs to one or more of the processing fingers.

35. The mobile handset of claim 34, wherein one or more of the one or more selectors is further configured for receiving a digitized signal comprising one or more Code Division Multiple Access signals as one of the inputs to one of the processing fingers.

36. The mobile handset of claim 34, wherein one or more of the one or more selectors is further configured for receiving a digitized signal comprising one or more Wideband Code Division Multiple Access signals as one of the inputs to one of the processing fingers.

37. The mobile handset of claim 34, wherein one or more of the one or more selectors is further configured for receiving a digitized signal comprising one or more Global Positioning System signals as one of the inputs to one of the processing fingers.

38. The mobile handset of claim 33, wherein the output signals are interference suppressed signals.

39. The mobile handset of claim 32, wherein the interference selector is further configured for providing on-time interfering pseudo noise (PN) codes of the plurality of interfering signals to the plurality of matrix generators.

40. The mobile handset of claim 32, wherein the signal comprises a Code Division Multiple Access signal.

41. The mobile handset of claim 32, wherein the signal comprises a Wideband Code Division Multiple Access signal.

42. The mobile handset of claim 32, wherein the signal comprises a Global Positioning System signal.

43. The mobile handset of claim 32, wherein the at least one of the plurality of interfering signals is selected based on amplitude.

44. The mobile handset of claim 32, wherein the at least one of the plurality of interfering signals is selected based on timing offset.

45. The mobile handset of claim 32, wherein the at least one of the plurality of interfering signals is selected based on phase.

46. The mobile handset of claim 32, wherein the at least one of the plurality of interfering signals is selected based on code sequence.