Method and system for I/Q mismatch calibration and compensation for wideband communication receivers

1. A method for wireless communication, the method comprising:

in a communication device:

receiving a radio frequency (RF) signal in a receiver of said communication device;

down-sampling said received RF signal to generate a channel k and its image channel −k at baseband frequencies;

determining average in-phase (I) and quadrature (Q) gain and phase mismatch of said channel k and said image channel −k;

determining a curvature of gain mismatch for said channel k and said image channel −k utilizing a blind source separation (BSS) estimation algorithm;

removing said average I and Q gain and phase mismatch of said channel k and said image channel −k;

determining, after said removing of said average I and Q gain and phase mismatch, a residual phase tilt and a residual amplitude tilt of said channel k and said image channel −k; and

compensating for said determined residual phase tilt and said determined residual amplitude tilt of said channel k and said image channel −k,

wherein compensating for said determined residual phase tilt comprises passing a signal through a phase tilt correction filter, and wherein said signal comprises a sum of said channel k and said image channel −k shifted in frequency based on said determined curvature of said gain mismatch.

2. The method according to claim 1 , comprising shifting a frequency of said channel k and said image channel −k in a direction based on said determined curvature.

3. The method according to claim 1 , wherein said phase tilt correction filter comprises one or more all-pass filters.

4. The method according to claim 1 , comprising determining said average I and Q gain and phase mismatch utilizing said blind source separation (BSS) estimation algorithm.

5. The method according to claim 1 , comprising averaging an estimating function of said BSS estimation algorithm over a number of samples and updating a separating matrix based on said averaging.

6. The method according to claim 1 , wherein said receiver is a direct conversion receiver.

7. A system for wireless communication, the system comprising:

one or more circuits for use in a communication device, said one or more circuits being operable to:

receive a radio frequency (RF) signal in a receiver of said communication device;

down-sample said received RF signal to generate a channel k and its image channel −k at baseband frequencies;

determine average in-phase (I) and quadrature (Q) gain and phase mismatch of said channel k and said image channel −k;

determine a curvature of gain mismatch for said channel k and said image channel −k utilizing a blind source separation (BSS) estimation algorithm;

remove said average I and Q gain and phase mismatch of said channel k and said image channel −k;

determine, after said average I and Q gain and phase mismatch are removed, a residual phase tilt and a residual amplitude tilt of said channel k and said image channel −k; and

compensate for said determined residual phase tilt and said determined residual amplitude tilt of said channel k and said image channel −k, wherein said compensation for said determined residual phase tilt comprises passing a signal through a phase tilt correction filter, and wherein said signal comprises a sum of said channel k and said image channel −k shifted in frequency based on said determined curvature of said gain mismatch.

8. The system according to claim 7 , wherein said one or more circuits are operable to shift a frequency of said channel k and said image channel −k in a direction based on said determined curvature.

9. The system according to claim 7 , wherein said phase tilt correction filter comprises one or more all-pass filters.

10. The system according to claim 7 , wherein said one or more circuits are operable to determine said average I and Q gain and phase mismatch utilizing said blind source separation (BSS) estimation algorithm.

11. The system according to claim 7 , wherein said one or more circuits are operable to average an estimating function of said BSS estimation algorithm over a number of samples and update a separating matrix based on said averaging.

12. A method for wireless communication, the method comprising:

in a communication device:

receiving a radio frequency (RF) signal in a receiver of said communication device;

down-sampling said received RF signal to generate a channel k and its image channel −k at baseband frequencies;

determining average in-phase (I) and quadrature (Q) gain and phase mismatch of said channel k and said image channel −k;

removing said average I and Q gain and phase mismatch of said channel k and said image channel −k;

determining, after removing said average I and Q gain and phase mismatch, a residual phase tilt and a residual amplitude tilt of said channel k and said image channel −k;

compensating for said determined residual phase tilt utilizing a phase tilt correction filter;

passing a signal through said phase tilt correction filter for said compensation, wherein said signal comprises a sum of said channel k and said image channel −k shifted in frequency based on a determined curvature of said gain mismatch; and

compensating for said determined residual phase tilt and said determined residual amplitude tilt of said channel k and said image channel −k.

13. The method according to claim 12 , comprising determining a curvature of gain mismatch for said channel k and said image channel −k.

14. The method according to claim 12 , comprising shifting a frequency of said channel k and said image channel −k in a direction based on said determined curvature.

15. The method according to claim 12 , comprising compensating for said determined residual phase tilt utilizing a phase tilt correction filter.

16. The method according to claim 12 , wherein said phase tilt correction filter comprises one or more all-pass filters.

17. The method according to claim 12 , comprising determining said average I and Q gain and phase mismatch utilizing a blind source separation (BSS) estimation algorithm.

18. The method according to claim 12 , comprising averaging an estimating function of said BSS estimation algorithm over a number of samples and updating a separating matrix based on said averaging.

19. The method according to claim 12 , wherein said receiver is a direct conversion receiver.

20. A system for wireless communication, the system comprising:

one or more circuits for use in a communication device, said one or more circuits being operable to:

receive a radio frequency (RF) signal in a receiver of said communication device;

down-sample said received RF signal to generate a channel k and its image channel −k at baseband frequencies;

determine average in-phase (I) and quadrature (Q) gain and phase mismatch of said channel k and said image channel −k;

remove said average I and Q gain and phase mismatch of said channel k and said image channel −k;

determine, after said average I and Q gain and phase mismatch are removed, a residual phase tilt and a residual amplitude tilt of said channel k and said image channel −k;

compensate for said determined residual phase tilt utilizing a phase tilt correction filter;

pass a signal through said phase tilt correction filter for said compensation, wherein said signal comprises a sum of said channel k and said image channel −k shifted in frequency based on a determined curvature of said gain mismatch; and

compensate for said determined residual phase tilt and said determined residual amplitude tilt of said channel k and said image channel −k.

21. The system according to claim 20 , wherein said one or more circuits is operable to determine a curvature of gain mismatch for said channel k and said image channel −k.

22. The system according to claim 21 , wherein said one or more circuits are operable to shift a frequency of said channel k and said image channel −k in a direction based on said determined curvature.

23. The system according to claim 20 , wherein said one or more circuits are operable to compensate for said determined residual phase tilt utilizing a phase tilt correction filter.

24. The system according to claim 23 , wherein said phase tilt correction filter comprises one or more all-pass filters.

25. The system according to claim 20 , wherein said one or more circuits are operable to determine said average I and Q gain and phase mismatch utilizing a blind source separation (BSS) estimation algorithm.

26. The system according to claim 25 , wherein said one or more circuits are operable to average an estimating function of said BSS algorithm over a number of samples and update a separating matrix based on said averaging.

27. A method for wireless communication, the method comprising:

in a communication device:

receiving a radio frequency (RF) signal in a receiver of said communication device;

down-sampling said received RF signal to generate a channel k and its image channel −k at baseband frequencies;

determining average in-phase (I) and quadrature (Q) gain and phase mismatch of said channel k and said image channel −k utilizing a blind source separation (BSS) estimation algorithm;

removing said average I and Q gain and phase mismatch of said channel k and said image channel −k;

determining, after said removing said average I and Q gain and phase mismatch, a residual phase tilt and a residual amplitude tilt of said channel k and said image channel −k; and

compensating for said determined residual phase tilt and said determined residual amplitude tilt of said channel k and said image channel −k, wherein said compensating for said determined residual phase tilt utilizes a phase tilt correction filter.

28. The method according to claim 27 , comprising determining a curvature of gain mismatch for said channel k and said image channel −k.

29. The method according to claim 28 , comprising shifting a frequency of said channel k and said image channel −k in a direction based on said determined curvature.

30. The method according to claim 29 , wherein said phase tilt correction filter comprises one or more all-pass filters.

31. The method according to claim 27 , wherein said receiver is a direct conversion receiver.

32. A method for wireless communication, the method comprising:

in a communication device:

receiving a radio frequency (RF) signal in a receiver of said communication device;

down-sampling said received RF signal to generate a channel k and its image channel −k at baseband frequencies;

determining average in-phase (I) and quadrature (Q) gain and phase mismatch of said channel k and said image channel −k utilizing a blind source separation (BSS) estimation algorithm;

averaging an estimating function of said BSS algorithm over a number of samples and updating a separating matrix based on said averaging

removing said average I and Q gain and phase mismatch of said channel k and said image channel −k;

determining, after said removing of said average I and Q gain and phase mismatch, a residual phase tilt and a residual amplitude tilt of said channel k and said image channel −k; and

compensating for said determined residual phase tilt and said determined residual amplitude tilt of said channel k and said image channel −k.

33. The method according to claim 32 , comprising determining a curvature of gain mismatch for said channel k and said image channel −k.

34. The method according to claim 33 , comprising shifting a frequency of said channel k and said image channel −k in a direction based on said determined curvature.

35. The method according to claim 32 , comprising compensating for said determined residual phase tilt utilizing a phase tilt correction filter.

36. The method according to claim 35 , wherein said phase tilt correction filter comprises one or more all-pass filters.

37. The method according to claim 32 , wherein said receiver is a direct conversion receiver.

38. A system for wireless communication, the system comprising:

one or more circuits for use in a communication device, said one or more circuits being operable to:

receive a radio frequency (RF) signal in a receiver of said communication device;

down-sample said received RF signal to generate a channel k and its image channel −k at baseband frequencies;

determine average in-phase (I) and quadrature (Q) gain and phase mismatch of said channel k and said image channel −k utilizing a blind source separation (BSS) estimation algorithm;

average an estimating function of said BSS algorithm over a number of samples and update a separating matrix based on said averaging;

remove said average I and Q gain and phase mismatch of said channel k and said image channel −k s;

determine, after said average I and Q gain and phase mismatch are removed, a residual phase tilt and a residual amplitude tilt of said channel k and said image channel −k; and

compensate for said determined residual phase tilt and said determined residual amplitude tilt of said channel k and said image channel −k.

39. The system according to claim 38 , wherein said one or more circuits is operable to determine a curvature of gain mismatch for said channel k and said image channel −k.

40. The system according to claim 39 , wherein said one or more circuits are operable to shift a frequency of said channel k and said image channel −k in a direction based on said determined curvature.

41. The system according to claim 38 , wherein said one or more circuits are operable to compensate for said determined residual phase tilt utilizing a phase tilt correction filter.

42. The system according to claim 41 , wherein said phase tilt correction filter comprises one or more all-pass filters.

43. A method for wireless communication, the method comprising:

in a communication device:

receiving a radio frequency (RF) signal in a receiver of said communication device;

down-sampling said received RF signal to generate a signal k and its image channel −k at baseband frequencies;

determining average in-phase (I) and quadrature (Q) gain and phase mismatch of said channel k and said image channel −k utilizing a blind source separation (BSS) estimation algorithm;

determining a curvature of gain mismatch for said channel k and said image channel −k utilizing a blind source separation (BSS) estimation algorithm;

removing said average I and Q gain and phase mismatch of said channel k and said image channel −k;

determining, after said removing of said average I and Q gain and phase mismatch, a residual phase tilt and a residual amplitude tilt of said channel k and said image channel −k; and

compensating for said determined residual phase tilt and said determined residual amplitude tilt of said channel k and said image channel −k.

44. The method according to claim 43 , comprising shifting a frequency of said channel k and said image channel −k in a direction based on said determined curvature.

45. The method according to claim 43 , comprising compensating for said determined residual phase tilt utilizing a phase tilt correction filter.

46. The method according to claim 45 , wherein said phase tilt correction filter comprises one or more all-pass filters.

47. The method according to claim 43 , comprising averaging an estimating function of said BSS algorithm over a number of samples and updating a separating matrix based on said averaging.

48. The method according to claim 43 , wherein said receiver is a direct conversion receiver.

49. A system for wireless communication, the system comprising

one or more circuits for use in a communication device, said one or more circuits being operable to:

receive a radio frequency (RF) signal in a receiver of said communication device;

down-sample said received RF signal to generate a signal k and its image channel −k at baseband frequencies;

determine average in-phase (I) and quadrature (Q) gain and phase mismatch of said channel k and said image channel −k;

determine a curvature of gain mismatch for said channel k and said image channel −k utilizing a blind source separation (BSS) estimation algorithm;

remove said average I and Q gain and phase mismatch of said channel k and said image channel −k utilizing a blind source separation (BSS) estimation algorithm;

determine, after said average I and Q gain and phase mismatch are removed, a residual phase tilt and a residual amplitude tilt of said channel k and said image channel −k; and

compensate for said determined residual phase tilt and said residual amplitude tilt of said channel k and said image channel −k.

50. The system according to claim 49 , wherein said one or more circuits are operable to shift a frequency of said channel k and said image channel −k in a direction based on said determined curvature.

51. The system according to claim 49 , wherein said one or more circuits are operable to compensate for said determined residual phase tilt utilizing a phase tilt correction filter.

52. The system according to claim 49 , wherein said phase tilt correction filter comprises one or more all-pass filters.

53. The system according to claim 49 , wherein said one or more circuits are operable to average an estimating function of said BSS algorithm over a number of samples and update a separating matrix based on said averaging.