Method and Apparatus for Reducing the Interferences Between a Wideband Device and a Narrowband Device Interfering with the Wideband Device

• US 20080205544A1
• Filed: 06/26/2006
• Published: 08/28/2008
• Est. Priority Date: 06/30/2005
• Status: Active Grant

• Current Assignee: STMicroelectronics International N.V. (STMicroelectronics NV)
• Original Assignee: STMicroelectronics NV
• Inventors: Berens, Friedbert
• Granted Patent: US 8,340,229 B2
• Time in Patent Office: Days
• US Class Current: 375/285
• CPC Class Codes: H04B 1/1036 with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters H04B1/123 takes precedence; filter circuits H03H
• CPC Class Codes: H04B 1/71632 Signal aspects H04B1/7172 and H04B1/7176 take precedence
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio channels

Abstract

The method includes an interference deduction mode for reducing interferences between a wideband device and a narrowband device. The method is performed within the wideband device and includes detecting an emission from and/or a reception performed by the narrowband device; determining from the detection step a group of at least one sub-carrier having frequencies interfering with the narrowband devices; and frequency shifting at least a part of frequency band of the wideband device including the group of at least one interfering sub-carriers with a chosen frequency shift such that at least a part of frequency band of the narrowband device is excluded from the frequency band of the wideband device.

Claims

1-29. -29. (canceled)

30. A method for reducing interference between a main device adapted to transmit information on sub-carriers having frequencies belonging to a main band of frequencies, and at least one auxiliary device adapted to emit and/or receive information within an auxiliary band of frequencies, the auxiliary band being narrower than the main band and included within the main band, the method comprising:

performing an interference reduction mode within the main device for reducing interference between the main device and the auxiliary device by at least

detecting an emission from and/or a reception performed by the at least one auxiliary device,

determining from the detecting a group of at least one interfering sub-carrier having a frequency interfering with the auxiliary band of frequencies, and

frequency shifting at least a part of the main band of frequencies, including the group of at least one interfering sub-carrier, with a frequency shift so that at least a part of the auxiliary band is excluded from the main band of frequencies.

31. A method according to claim 30, wherein the frequency shift is chosen so that the entire auxiliary band is excluded from the main band of frequencies.

32. A method according to claim 30, wherein the frequency shift is at least equal to a width of the frequency band of the at least one auxiliary device.

33. A method according to claim 30, wherein the main band of frequencies is subdivided into several different mutually spaced sub-bands, and frequency shifting comprises frequency shifting at least the sub-band which contains at least a part of the group of at least one interfering sub-carrier.

34. A method according to claim 30, wherein the main device comprises a transmission chain including a radio frequency stage including controllable transposition circuitry, and the frequency shifting comprises modifying the transposition frequency of the controllable transposition circuitry.

35. A method according to claim 30, wherein detecting comprises analyzing channel state information and detecting operation of the at least one auxiliary device from the channel state information.

36. A method according to claim 35, wherein detecting further comprises checking the detection by using a set of stored interference information respectively associated with a set of several different auxiliary devices.

37. A method according to claim 30, wherein the interference reduction mode comprises regularly checking the operation of the auxiliary device and if the auxiliary device is not detectable, the interference reduction mode concerning the non-detected auxiliary device is stopped.

38. A method according to claim 30, wherein the main device and the at least one auxiliary device are both incorporated within a single wireless communication apparatus.

39. A method according to claim 38, wherein an indication of the group of at least one interfering sub-carrier, having a frequency interfering with the auxiliary band of frequencies of the auxiliary device, is stored and the detecting further comprises receiving from the auxiliary device control information representative of the operation or of the non-operation of the auxiliary device, such that the interference reduction mode is performed only during the operation of the auxiliary device.

40. A method according to claim 30, wherein the main device comprises at least part of a multi-carrier based Ultra Wide Band communication system.

41. A method according to claim 40, wherein the main device comprises at least part of an OFDM based Ultra Wide Band communication system.

42. A method according to claim 30, wherein the at least one auxiliary device comprises at least part of a fixed wireless access system or a mobile radio system.

43. A method according to claim 41, wherein the at least one auxiliary device comprises at least part of a fixed satellite service system.

44. A method for reducing interference between a main device adapted to transmit information on sub-carriers having frequencies belonging to a main band of frequencies, and at least one auxiliary device adapted to emit and/or receive information within an auxiliary band of frequencies, the main device and the at least one auxiliary device both carried by a common housing, the auxiliary band being narrower than the main band and included within the main band, the method comprising:

performing an interference reduction mode within the main device for reducing interference between the main device and the auxiliary device by at least

detecting an emission from and/or a reception performed by the at least one auxiliary device, and checking the detection by using a set of stored interference information respectively associated with a set of several different auxiliary devices,

determining from the detecting a group of at least one interfering sub-carrier having a frequency interfering with the auxiliary band of frequencies, and

frequency shifting at least a part of the main band of frequencies, including the group of at least one interfering sub-carrier, with a frequency shift so that at least a part of the auxiliary band is excluded from the main band of frequencies.

45. A method according to claim 44, wherein the frequency shift is chosen so that the entire auxiliary band is excluded from the main band of frequencies.

46. A method according to claim 44, wherein the frequency shift is at least equal to a width of the frequency band of the at least one auxiliary device.

47. A method according to claim 44, wherein the main band of frequencies is subdivided into several different mutually spaced sub-bands, and frequency shifting comprises frequency shifting at least the sub-band which contains at least a part of the group of at least one interfering sub-carrier.

48. A method according to claim 44, wherein the main device comprises a transmission chain including a radio frequency stage including controllable transposition circuitry, and the frequency shifting comprises modifying the transposition frequency of the controllable transposition circuitry.

49. A wireless communication apparatus, comprising:

a main device having a main transmission chain for transmitting information on sub-carriers having frequencies belonging to a main band of frequencies; and

interference reduction circuitry for reducing the interference between the main device and at least one auxiliary device adapted to emit and/or receive information within an auxiliary band of frequencies being narrower than the main band and included within the main band;

said interference reduction circuitry including

detecting circuitry for detecting an emission from and/or a reception performed by the at least one auxiliary device, and

a control unit connected to the detecting circuitry for determining a group of at least one sub-carrier having frequencies interfering with the auxiliary band of frequencies, and for frequency shifting at least a part of the main band of frequencies including the group with a chosen frequency shift such that at least a part of the auxiliary band is excluded from the main band of frequencies.

50. An apparatus according to claim 49, wherein the frequency shift is chosen so that the entire auxiliary band is excluded from the main band of frequencies.

51. An apparatus according to claim 49, wherein the frequency shift is at least equal to the width of the frequency band of the at least one auxiliary device.

52. An apparatus according to claim 49, wherein the main band of frequencies is subdivided into several different mutually spaced sub-bands, and the control unit is adapted to shift at least the sub-band which contains at least a part of the group of at least one sub-carrier having frequencies interfering with the auxiliary band of frequencies.

53. An apparatus according to claim 49, wherein the transmission chain comprises a radio frequency stage including controllable transposition circuitry, and the control unit is adapted to modify the transposition frequency of the transposition circuitry for performing the frequency shifting.

54. An apparatus according to claim 49, further comprising a channel estimation unit adapted to deliver a channel state information, wherein the detection circuitry comprises analyzing circuitry for analyzing the channel state information and detecting the operation of the at least one auxiliary device from the channel state information.

55. An apparatus according to claim 54, further comprising memory circuitry for storing a set of interference information respectively associated to a set of several different auxiliary devices, and checking circuitry for checking the operation detection by using the stored set of interference information.

56. An apparatus according to claim 49, further comprising a management unit adapted to manage the operation of the interference reduction circuitry, and wherein the interference reduction circuitry is further adapted to regularly check the operation of the auxiliary device and if the auxiliary device is not detectable the management unit is adapted to stop the interference reduction concerning the not detectable auxiliary device.

57. An apparatus according to claim 49, further comprising a common housing carrying the main device and the at least one auxiliary device.

58. An apparatus according to claim 57, further comprising:

a management unit adapted to manage the operation of the interference reduction circuitry; and

memory circuitry for storing an indication of the group of at least one sub-carrier having frequencies interfering with the auxiliary band of frequencies of the auxiliary device;

wherein the auxiliary device comprises auxiliary control circuitry for delivering an auxiliary control information representative of the operation or of the non operation of the auxiliary device, such that the management unit is adapted to allow the operation of the main interference reduction circuitry only during the operation of the auxiliary device.

59. An apparatus according to claim 49, wherein the main device comprises at least part of a multi-carrier based Ultra Wide Band communication system.

60. An apparatus according to claim 59, wherein the main device comprises at least part of an OFDM based Ultra Wide Band communication system.

61. An apparatus according to claim 59, wherein the main device has a physical layer incorporating the interference reduction circuitry.

62. An apparatus according to claim 49, wherein the at least one auxiliary device comprises at least part of a fixed wireless access system or to a mobile radio system defined by a mobile radio standard.

63. An apparatus according to claim 49, wherein the at least one auxiliary device comprises at least part of a fixed satellite service system.