Method and apparatus for mitigation of disturbers in communication systems

• US 6,834,109 B1
• Filed: 11/10/2000
• Issued: 12/21/2004
• Est. Priority Date: 11/11/1999
• Status: Expired due to Fees

• Current Assignee: Tokyo Electron Limited
• Original Assignee: Tokyo Electron Limited
• Inventors: Shah, Sunil C., Kanellakopoulos, Ioannis, Gu, Ming, Erickson, Mark Alan, Tsatsanis, Michail, Waite, James W., Yuen, Norman Man Leung, Galarza, Cecilia Gabriela, Hernandez, Daniel Joseph, Paré, Thomas E. Jr., Lopez-de-Victoria, Fernando, Rosario, Heberly, Lin, Di
• Primary Examiner(s): Bui, Bing Q.
• Application Number:
  US09/710,610
• Time in Patent Office: 1,502 Days
• Field of Search: 379/1.01, 379/10.01, 379/220.01, 379/414, 379/416, 379/417, 375/144, 375/148, 375/254, 375/278, 375/284, 375/285, 375/296, 375/346, 375/348
• US Class Current: 379/416
• CPC Class Codes: H04B 3/32 Reducing cross-talk, e.g. by compensating
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/03305 Joint sequence estimation and interference removal joint detection of several desired signals H04L25/03331
• CPC Class Codes: H04L 41/046 comprising network management agents or mobile agents therefor
• CPC Class Codes: H04L 41/06 Management of faults, events, alarms or notifications
• CPC Class Codes: H04L 41/142 using statistical or mathematical methods
• CPC Class Codes: H04L 41/145 involving simulating, designing, planning or modelling of a network
• CPC Class Codes: H04L 5/0044 allocation of payload

Abstract

The present invention includes a method and system for compensating for cross-talk interference in communication systems. The method includes estimation of the interfering signals. Further, the method includes performing a compensation operation on at least one interfering signal.

Claims

1. A method for reducing interference in a communication system, the method comprising:

receiving a composite signal comprised of a main signal and at least one interfering signal;

performing a training operation comprising a frequency domain training and a time domain training operation;

performing a channel model identification comprising identifying the main signal and identifying the at least one interfering signal;

designing a compensation system to obtain an estimation of the at least one interfering signal;

performing a compensation operation of the at least one interfering signals using the compensation system; and

performing a final detection and adaptation of the main signal.

2. The method according to claim 1, wherein designing a compensation system comprises:

estimating a compensated signal-to-noise ratio of each of the at least one interfering signal; and

estimating a corresponding compensated bit loading.

3. The method according to claim 2, wherein designing a compensation system further comprises:

selecting a set of interfering signals according to the estimated, compensated signal-to-noise ration of each of the at least one interfering signal.

4. The method according to claim 3, wherein designing a compensation system further comprises:

determining a gain corresponding to the estimated bit loading of each signal of the set of interfering signals.

5. The method according to claim 1, wherein estimating the at least one interfering signal is performed using a maximum likelihood sequence estimator.

6. The method according to claim 1, wherein designing a compensation system further comprises approximating a signal constellation aggregated set corresponding to the at least one interfering signal.

7. The method according to claim 6, wherein approximating the signal constellation aggregated set comprises determining a set of optimal cluster centers.

8. The method according to claim 7, wherein determining the set of optimal cluster centers comprises calculating a set of centroids.

9. The method according to claim 1, wherein designing a compensation system further comprises:

designing a equalizer in order to pre-filter the at least one interfering signal.

10. The method according to claim 9, wherein the equalizer is a viterbi equalizer.

11. The method according to claim 9, wherein designing the equalizer comprises:

selecting a number of design parameters;

forming a set of convolution matrices of the at least one interfering signal;

forming a set of reduced matrices from the set of convolution matrices for a given delay window of the at least one interfering signal;

determining an equalizer parameter; and

determining a Least Square Metric for the equalizer parameter.

12. The method according to claim 11, wherein selecting a number of design parameters comprises selecting a desired channel length of the at least one interfering signal.

13. The method according to claim 11, wherein selecting a number of design parameters comprises selecting an equalizer filter length.

14. The method according to claim 11, wherein selecting a number of design parameters comprises selecting a bit error rate for the at least one interfering signal.

15. The method according to claim 11, wherein selecting a number of design parameters comprises selecting a relative weight factor in order to control the channel length.

16. The method according to claim 11, wherein designing the equalizer further comprises evaluating the Least Square Metric of the equalizer.

17. The method according to claim 11, wherein determining the equalizer parameter is performed using a joint least square method.

18. The method according to claim 11, wherein determining the equalizer parameter is performed using a singular value decomposition method.

19. The method according to claim 1, wherein designing a compensation system to obtain an estimation of the at least one interfering signal comprises processing the at least one interfering signal using a joint viterbi process.

20. A computer readable medium containing executable instructions which, when executed in a processing system, cause said system to perform a method comprising:

receiving a composite signal comprised of a main signal and at least one interfering signal;

performing a training operation comprising a frequency domain training and a time domain training operation;

performing a channel model identification comprising identifying the main signal and identifying the at least one interfering signal;

designing a compensation system to obtain an estimation of the at least one interfering signal;

performing a compensation operation of the at least one interfering signals using the compensation system; and

performing a final detection and adaptation of the main signal.

21. The computer readable medium according to claim 20, wherein designing a compensation system comprises:

estimating a compensated signal-to-noise ratio of each of the at least one interfering signal; and

estimating a corresponding compensated bit loading.

22. The computer readable medium according to claim 21, wherein designing a compensation system further comprises:

selecting a set of interfering signals according to the estimated, compensated signal-to-noise ration of each of the at least one interfering signal.

23. The computer readable medium according to claim 22, wherein designing a compensation system further comprises:

determining a gain corresponding to the estimated bit loading of each signal of the set of interfering signals.

24. The computer readable medium according to claim 20, wherein estimating the at least one interfering signal is performed using a maximum likelihood sequence estimator.

25. The computer readable medium according to claim 20, wherein designing a compensation system further comprises approximating a signal constellation aggregated set corresponding to the at least one interfering signal.

26. The computer readable medium according to claim 25, wherein approximating the signal constellation aggregated set comprises determining a set of optimal cluster centers.

27. The computer readable medium according to claim 26, wherein determining the set of optimal cluster centers comprises calculating a set of centroids.

28. The computer readable medium according to claim 20, wherein designing a compensation system further comprises:

designing a equalizer in order to pre-filter the at least one interfering signal.

29. The computer readable medium according to claim 28, wherein the equalizer is a viterbi equalizer.

30. The computer readable medium according to claim 28, wherein designing the equalizer comprises:

selecting a number of design parameters;

forming a set of convolution matrices of the at least one interfering signal;

forming a set of reduced matrices from the set of convolution matrices for a given delay window of the at least one interfering signal;

determining an equalizer parameter; and

determining a Least Square Metric for the equalizer parameter.

31. The computer readable medium according to claim 30, wherein selecting a number of design parameters comprises selecting a desired channel length of the at least one interfering signal.

32. The computer readable medium according to claim 30, wherein selecting a number of design parameters comprises selecting an equalizer filter length.

33. The computer readable medium according to claim 30, wherein selecting a number of design parameters comprises selecting a bit error rate for the at least one interfering signal.

34. The computer readable medium according to claim 30, wherein selecting a number of design parameters comprises selecting a relative weight factor in order to control the channel length.

35. The computer readable medium according to claim 30, wherein designing the equalizer further comprises evaluating the Least Square Metric of the equalizer.

36. The computer readable medium according to claim 30, wherein determining the equalizer parameter is performed using a joint least square method.

37. The computer readable medium according to claim 30, wherein determining the equalizer parameter is performed using a singular value decomposition method.

38. The computer readable medium according to claim 20, wherein designing a compensation system to obtain an estimation of the at least one interfering signal comprises processing the at least one interfering signal using a joint viterbi process.

39. An article of manufacture comprising a program storage medium readable by a computer and tangibly embodying at least one program of instructions executable by the computer to perform a method comprising:

receiving a composite signal comprised of a main signal and at least one interfering signal;

performing a training operation comprising a frequency domain training and a time domain training operation;

performing a channel model identification comprising identifying the main signal and identifying the at least one interfering signal;

designing a compensation system to obtain an estimation of the at least one interfering signal;

performing a compensation operation of the at least one interfering signals using the compensation system; and

performing a final detection and adaptation of the main signal.

40. The article of manufacture according to claim 39, wherein designing a compensation system comprises:

estimating a compensated signal-to-noise ratio of each of the at least one interfering signal; and

estimating a corresponding compensated bit loading.

41. The article of manufacture according to claim 40, wherein designing a compensation system further comprises:

selecting a set of interfering signals according to the estimated, compensated signal-to-noise ration of each of the at least one interfering signal.

42. The article of manufacture according to claim 41, wherein designing a compensation system further comprises:

determining a gain corresponding to the estimated bit loading of each signal of the set of interfering signals.

43. The article of manufacture according to claim 39, wherein estimating the at least one interfering signal is performed using a maximum likelihood sequence estimator.

44. The article of manufacture according to claim 39, wherein designing a compensation system further comprises approximating a signal constellation aggregated set corresponding to the at least one interfering signal.

45. The article of manufacture according to claim 44, wherein approximating the signal constellation aggregated set comprises determining a set of optimal cluster centers.

46. The article of manufacture according to claim 45, wherein determining the set of optimal cluster centers comprises calculating a set of centroids.

47. The article of manufacture according to claim 39, wherein designing a compensation system further comprises:

designing a equalizer in order to pre-filter the at least one interfering signal.

48. The article of manufacture according to claim 47, wherein the equalizer is a viterbi equalizer.

49. The article of manufacture according to claim 47, wherein designing the equalizer comprises:

selecting a number of design parameters;

forming a set of convolution matrices of the at least one interfering signal;

forming a set of reduced matrices from the set of convolution matrices for a given delay window of the at least one interfering signal;

determining an equalizer parameter; and

determining a Least Square Metric for the equalizer parameter.

50. The article of manufacture according to claim 49, wherein selecting a number of design parameters comprises selecting a desired channel length of the at least one interfering signal.

51. The article of manufacture according to claim 49, wherein selecting a number of design parameters comprises selecting an equalizer filter length.

52. The article of manufacture according to claim 49, wherein selecting a number of design parameters comprises selecting a bit error rate for the at least one interfering signal.

53. The article of manufacture according to claim 49, wherein selecting a number of design parameters comprises selecting a relative weight factor in order to control the channel length.

54. The article of manufacture according to claim 49, wherein designing the equalizer further comprises evaluating the Least Square Metric of the equalizer.

55. The article of manufacture according to claim 49, wherein designing a compensation system to obtain an estimation of the at least one interfering signal comprises processing the at least one interfering signal using a joint viterbi process.

56. The article of manufacture according to claim 49, wherein determining the equalizer parameter is performed using a joint least square method.

57. The article of manufacture according to claim 49, wherein determining the equalizer parameter is performed using a singular value decomposition method.

58. A compensation method comprising:

receiving a composite signal comprised of a main signal and at least one interfering signal;

designing a equalizer in order to pre-filter the at least one interfering signal, wherein designing the equalizer comprises;

selecting a number of design parameters;

forming a set of convolution matrices of the at least one interfering signal;

forming a set of reduced matrices from the set of convolution matrices for a given delay window of the at least one interfering signal;

determining an equalizer parameter; and

determining a Least Square Metric for the equalizer parameter.

59. The method according to claim 58, wherein the equalizer is a viterbi equalizer.

60. The method according to claim 58, wherein selecting a number of design parameters comprises selecting a desired channel length of the at least one interfering signal.

61. The method according to claim 58, wherein selecting a number of design parameters comprises selecting an equalizer filter length.

62. The method according to claim 58, wherein selecting a number of design parameters comprises selecting a bit error rate for the at least one interfering signal.

63. The method according to claim 58, wherein selecting a number of design parameters comprises selecting a relative weight factor in order to control the channel length.

64. The method according to claim 58, wherein designing the equalizer further comprises evaluating the Least Square Metric of the equalizer.

65. The method according to claim 58, wherein designing a compensation system to obtain an estimation of the at least one interfering signal comprises processing the at least one interfering signal using a joint viterbi process.

66. The method according to claim 58, wherein determining the equalizer parameter is performed using a joint least square method.

67. The method according to claim 58, wherein determining the equalizer parameter is performed using a singular value decomposition method.

68. A compensation system comprising:

a receiver for receiving a composite signal comprising a main signal and at least one interfering signals;

a removal module for removing the main signal form the composite signal;

a detection module for estimating the at least one interfering signal, wherein the detection module comprises an equalizer to pre-filter the at least one interfering signal; and

a second removal module for removing the at least one estimated interfering signal from the composite signal.

69. The compensating system according to claim 68, wherein the equalizer is a viterbi equalizer.

70. The compensating system according to claim 68, wherein the second removal module comprises a remodulator for remodulating the at least one estimated interfering signal.

71. The compensating system according to claim 68, wherein the receiver comprises:

a time domain equalizer; and

a frequency domain equalizer.

72. A system comprising:

a receiver module for processing a received signal;

an identification module for identifying and estimating the received signal;

a bit loading module; and

a compensator module for estimating and compensating for at least one disturber of the received signal.