METHOD AND SYSTEM OF INTERFERENCE CANCELATION IN COLLOCATED TRANSCEIVERS CONFIGURATIONS

• US 20130102254A1
• Filed: 05/26/2011
• Published: 04/25/2013
• Est. Priority Date: 05/27/2010
• Status: Active Grant

• Current Assignee: Ubiqam Ltd.
• Original Assignee: Ubiqam Ltd.
• Inventors: Cyzs, Baruch, Amidan, Oren, Manor, Daniel, Meir, Amir
• Granted Patent: US 9,065,519 B2
• Time in Patent Office: Days
• US Class Current: 455/63.1
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• 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 1/525 with means for reducing leakage of transmitter signal into the receiver

Abstract

The present invention, in some embodiments thereof, relates to a method of cancelling interference in a wireless system, wherein the interference introduced by an interfering signal causing reception of an interfered signal responsive to transmission of a desired signal, the method comprising acquiring the interfering signal from a transmitter during or before transmission thereof, generating an analog cancellation signal based on the acquired interfering signal, and injecting said analog cancellation signal into an interfered receiver receiving said interfered signal to reduce said interference therefrom.

Claims

1. A method of cancelling interference in a wireless system, said interference introduced by an interfering signal causing reception of an interfered signal responsive to transmission of a desired signal, comprising:

acquiring said interfering signal from a transmitter during or before transmission thereof in time or frequency domain;

generating an analog cancellation signal based on said acquired interfering signal in time or frequency domain; and

injecting said analog cancellation signal into an interfered receiver receiving said interfered signal to reduce said interference therefrom.

2. A method according to claim 1, further comprising estimating a reception interference based on at least one previously received interfered signal, wherein the analog cancellation signal is generated based on said estimated interfered reception and the acquired interfering signal.

5. A method according to claim 1, wherein the injecting employs a transmitter, said transmitter being part of a transceiver comprising the interfered receiver.

7. A method according to claim 1, wherein the interfered signal is received by a receiving antenna located adjacent to a transmitting antenna from which the interfering signal is transmitted.

18. A method according to claim 2, wherein the at least one previously received interfered signal comprises at least one previously received interfered signal to which a cancellation signal been injected or summated.

21. A method according to claim 1, further comprising transmitting the interfering signal using a set of antennas configured to steer null or select a beam minimizing interference toward the antenna of the interfered receiver.

22. A method according to claim 1, further comprising receiving the interfered signal using a set of antennas configured to steer null towards the antenna of the interfering transmitter or select a beam minimizing interference from the antenna of the Interfering transmitter.

24. A multiple input multiple output antennas configuration comprising a plurality of interfered receivers each adapted to perform the interference cancelling according to claim 1.

29. A method according to claim 1, used to provide reduced degree of freedom for beamformer weights setting.

50. A method according to claim 1, wherein the estimating utilizes an adaptive filter configured to generate a plurality of coefficients based on at least one previously received interfered signal to which a cancellation signal been injected or summated, said plurality of coefficients are used for generating the cancellation signal.

51. A method according to claim 1, further comprising adjusting power of a transmitter from which the interfering signal is transmitted to a maximal value causing limited interference or degradation in the receiver if after the result of the injecting or summating residual error in the obtained signal is still high.

54. A method according to claim 50, wherein the adaptive filter is a finite impulse response filter or a frequency domain filter.

55. A method according to claim 30 or 39 1, wherein the estimating comprises frequency domain wide-band acquisition and tracking.

3-4. -4. (canceled)

6. (canceled)

8. A method of cancelling interference in a wireless system, said interference introduced by an interfering signal causing reception of an interfered signal responsive to transmission of a desired signal, comprising:

acquiring analog signals generated by a transmitter during or before transmission of said interfering signal;

generating a digital cancellation signal based on said acquired analog signal; and

summating in an interfered receiver receiving said interfered signal said digital cancellation signal and said interfered transmission to reduce said interference therefrom.

9. A method according to claim 8, wherein the acquiring comprises digital acquisition or analog measurement of the generated signals.

12. A method according to claim 8, wherein the interfered signal is received by a receiving antenna located adjacent to a transmitting antenna from which the interfering signal is transmitted.

13. A method according to claim 8, further comprising estimating a reception interference based on at least one previously received interfered signal, wherein the digital cancellation signal is generated based on said estimated reception interference and the said acquired analog signal.

14. A method according to claim 8, wherein the acquiring comprises receiving the generated analog signals using an additional receiver coupled to the interfering transmitter.

10-11. -11. (canceled)

15-17. -17. (canceled)

19-20. -20. (canceled)

23. (canceled)

25-28. -28. (canceled)

30. A method of cancelling interference introduced in a wireless system into a desired signal transmitted from a primary antenna of a primary transmitter, said interference introduced by an interfering signal transmitted from a secondary antenna of a secondary transmitter, said primary and secondary antennas being adjacently located, comprising:

acquiring said interfering signal before or during transmission thereof;

estimating reception interference based on said acquired interfering signal;

generating a cancellation signal based on said estimating and said acquired interfering signal; and

injecting said cancellation signal into said primary transmitter for reducing interference related to said interfering signal at a primary receiver receiving a composite signal comprising said desired signal and said interference.

31. A method according to claim 30, wherein the injecting is into an analog or digital transmission path of the primary transmitter.

33. A method according to claim 30, wherein the primary and secondary transmitters are transmitters with directional antennas with partially overlapping transmitter antenna patterns.

34. A method according to claim 30, further comprising a reciprocal cancellation performed for cancelling in the secondary transmitter interference introduced by an interfering signal transmitted from the primary antenna of the primary transmitter.

37. A method according to claim 30, wherein the estimating is carried out in a remote receiver receiving the interfering signal and configured to provide a plurality of coefficients based on at least one previously received interfered signal, further comprising transmitting said coefficients to the primary transmitter for generating the cancelation signal.

46. A method according to claim 30, wherein the primary and secondary transmitters or receivers are respective parts of primary and secondary hub transceivers in a hub and spoke communication network.

32. (canceled)

35-36. -36. (canceled)

38. (canceled)

39. A method of cancelling interference introduced in a wireless system into a desired signal transmitted to a primary antenna of a primary receiver, said interference introduced by an interfering signal transmitted to a secondary antenna of a secondary receiver, said primary and secondary antennas being adjacently located, said primary receiver receives a composite signal comprising said desired signal and said interference, the method comprising:

acquiring said interfering signal as received through said secondary antenna;

estimating reception interference of said interfering signal based on said acquired interfering signal;

generating a cancellation signal based on said estimating and said acquired interfering signal; and

summating in said primary receiver said composite signal and said cancellation signal to reduce said interference.

40. A method according to claim 39, wherein the primary and secondary receivers are receivers with directional antennas with partially overlapping receiver antenna patterns.

41. A method according to claim 39, further comprising a reciprocal cancellation performed for cancelling in the secondary receiver interference introduced by an interfering signal received by the primary antenna of the primary receiver.

44. A method according to claim 39, wherein the estimating is performed by temporarily muting of the primary transmitter or by transmission of a pre-known interfering signal to the secondary receiver.

65. A system according to claim 44 comprised of a plurality transceivers using directional antennas with mutual partial overlapping radiation pattern antennas arranged as hub and spoke topology for backhaul application, each transceiver comprising a cross-lobe cancelation mechanism fed by overlapping transceivers.

42-43. -43. (canceled)

45. (canceled)

47-49. -49. (canceled)

52-53. -53. (canceled)

56. A system for cancelling interference in a wireless system, said interference introduced by an interfering signal causing reception of an interfered signal responsive to transmission of a desired signal, comprising:

a first multiplier which multiplies a frequency domain representation of said interfered signal to which a cancellation signal been applied, by a conjugate of a frequency domain representation of said interfering signal; and

a second multiplier which multiplies a modified multiplication result obtained from said first multiplier and scaled using a predefined scaling factor, by the frequency domain representation of said interfering signal, thereby generating said cancelling signal.

57-64. -64. (canceled)

66-67. -67. (canceled)