Full duplex radio transceiver with remote radar detection

• US 9,345,036 B2
• Filed: 01/28/2015
• Issued: 05/17/2016
• Est. Priority Date: 08/17/2011
• Status: Active Grant

• Current Assignee: COMS IP Holdings LLC
• Original Assignee: CBF Networks, Inc. (COMSovereign Holding Corp.)
• Inventors: Fischer, Jeffrey, Gandham, Kishore, Negus, Kevin J.
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): Sharma, Gautam
• Application Number:
  US14/608,024
• Publication Number:
  US 20150139160A1
• Time in Patent Office: 475 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence
• CPC Class Codes: H01Q 25/00 Antennas or antenna systems providing at least two radiating patterns arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00
• CPC Class Codes: H01Q 25/005 providing two patterns of opposite direction; back to back antennas H01Q25/004 takes precedence
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04K 2203/32 including a particular configuration of antennas
• CPC Class Codes: H04K 2203/36 including means for exchanging jamming data between transmitter and receiver, e.g. in forward or backward direction
• CPC Class Codes: H04K 3/224 with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer
• CPC Class Codes: H04K 3/226 Selection of non-jammed channel for communication spectrum sharing arrangements H04W16/14; selection of wireless resources by user or terminal H04W72/02
• CPC Class Codes: H04K 3/28 with jamming and anti-jamming mechanisms both included in a same device or system, e.g. wherein anti-jamming includes prevention of undesired self-jamming resulting from jamming
• CPC Class Codes: H04K 3/822 by detecting the presence of a surveillance, interception or detection
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A radar detector is used with a radio link, the radio link characterized by high duty factor operation of a radio transmitter. The radar detector is located a sufficient distance from the radio transmitter that the radar detector is not overwhelmed by the radio transmission signal in that channel and can detect sufficiently low level radar signals to ascertain potential radio interference at the radar from said radio transmitter. The results of the radar detection are communicated to the transmitter in a way that impacts the transmitter'"'"'s use of the sensed channel. This communication can occur reactively when a radar detection is achieved (the absence of which indicates no radar has been detected) and/or can be a periodic or event-driven indication that the channel is available for operation (the information expiring if the result is not refreshed).

Claims

1. A wireless communications system comprising:

a first transceiver, wherein the first transceiver comprises a first transmitter and a first receiver, and wherein the first transmitter transmits on a first transmit channel;

a second transceiver, wherein the second transceiver comprises a second transmitter and a second receiver, and wherein the second transmitter transmits on a second transmit channel;

wherein the first receiver receives from the second transmitter on the second transmit channel and the second receiver receives from the first transmitter on the first transmit channel;

wherein the first transmit channel is within a first transmit frequency band and the second transmit channel is within a second transmit frequency band;

a first radar detector, wherein the first radar detector is configured to detect radar signals within a first radar detection frequency range that includes at least part of the second transmit frequency band;

wherein the first radar detector is configured to detect radar signals within at least a first time period, the first time period comprising at least a first period of time when the first transmitter and the second transmitter both transmit coincident in time;

wherein the first radar detector communicates at least a first radar detection result to the second receiver;

wherein the first radar detection result is an input to a first controller associated with the second transmitter; and

wherein the first controller controls a transmission from the second transmitter based on the first radar detection result; and

wherein the first radar detector is configured to be not transmit-impaired by the second transmitter when the second transmitter transmits, at least in part due to a physical separation of the first radar detector and the second transmitter.

2. The wireless communications system of claim 1 wherein the first radar detector is configured to be not transmit-impaired by the first transmitter when the first transmitter transmits, at least in part due to a physical separation of the first radar detector and the first transmitter.

3. The wireless communications system of claim 1 wherein the first radar detector is configured to be not transmit-impaired by the first transmitter when the first transmitter transmits, at least in part due to an antenna pattern of the first radar detector relative to the antenna pattern of the first transmitter.

4. The wireless communications system of claim 1 wherein the first controller associated with the second transmitter is capable of causing an adjustment of at least one adjustable parameter associated with the transmission of the second transmitter.

5. The wireless communications system of claim 4 wherein the at least one adjustable parameter associated with the transmission of the second transmitter is a transmit power.

6. The wireless communications system of claim 4 wherein the at least one adjustable parameter associated with the transmission of the second transmitter is a center frequency.

7. The wireless communications system of claim 5 wherein the transmit power of the second transmitter after the adjustment is at a level below that of a regulatory limit for transmit power within a channel for which a radar signal has been detected.

8. The wireless communications system of claim 1 wherein the first radar detection frequency range includes at least 80% of a bandwidth of the second transmit channel.

9. The wireless communications system of claim 8 wherein the first radar detection frequency range further includes at least 80% of a bandwidth of a first alternate channel that is different from the second transmit channel.

10. The wireless communications system of claim 1 wherein the first radar detection result is communicated within a radar detection message, control frame or status that at least indicates whether or not at least one radar signal has been detected within the first radar detection frequency range.

11. The wireless communications system of claim 1 wherein the first radar detection result is communicated within a radar detection message, control frame or status that at least indicates whether or not at least one radar signal has been detected within the second transmit channel.

12. The wireless communications system of claim 10 wherein the radar detection message, control frame or status indicates a bandwidth of the at least one detected radar signal within the first radar detection frequency range.

13. The wireless communications system of claim 1 wherein the part of the first time period when at least the first transmitter and the second transmitter both transmit coincident in time is 100% of the first time period for which the first radar detector is configured to at least detect radars.

14. The wireless communications system of claim 4 wherein the first controller associated with the second transmitter is capable of causing the adjustment based at least upon the first radar detection result.

15. The wireless communications system of claim 1 wherein the first transmit frequency band overlaps in frequency with the second transmit frequency band.

16. The wireless communications system of claim 1 wherein the first radar detection frequency range does not overlap in frequency with the first transmit frequency band.

17. The wireless communications system of claim 1 wherein the first radar detection frequency range is identical to or a subset of the second transmit frequency band.

18. The wireless communications system of claim 1 further comprising:

a second radar detector;

wherein the second radar detector is configured to detect radar signals within at least a second time period, the second time period comprising at least a period of time when the first transmitter and the second transmitter both transmit coincident in time; and

wherein the second radar detector is configured to detect radar signals within a second radar detection frequency range.

19. The wireless communications system of claim 18 wherein the first time period overlaps in time with the second time period.

20. The wireless communications system of claim 18 wherein the second radar detection frequency range excludes the second transmit channel.

21. The wireless communications system of claim 18 wherein the second radar detection frequency range includes at least a second alternate channel that is different from the second transmit channel.

22. The wireless communications system of claim 18:

wherein the second radar detector communicates at least a second radar detection result to the second receiver;

and wherein the second radar detection result is an input to the first controller associated with the second transmitter.

23. The wireless communications system of claim 22 wherein the second radar detection result is communicated within a radar detection message, control frame or status that at least indicates whether or not at least one radar has been detected within the second alternate channel.

24. The wireless communications system of claim 18:

wherein the second radar detector communicates at least a second radar detection result to the first receiver;

wherein the second radar detection result is an input to a second controller associated with the first transmitter;

and wherein the second controller controls a transmission from the first transmitter based on the second radar detection result.

25. The wireless communications system of claim 18 wherein the second radar detection frequency range is identical to or a subset of the first transmit frequency band.

26. The wireless communications system of claim 23 further comprising:

a third radar detector;

wherein the third radar detector is configured to detect radar signals within at least a third time period, the third time period comprising at least a period of time when the first transmitter and the second transmitter both transmit coincident in time;

wherein the third radar detector is configured to detect radar signals within a third radar detection frequency range;

wherein the third radar detector communicates at least a third radar detection result to the first receiver;

and wherein the third radar detection result is an input to a third controller associated with the first transmitter.

27. The wireless communications system of claim 1 further comprising:

a first cancellation circuit, wherein the first cancellation circuit is coupled to at least the first radar detector;

and wherein the first cancellation circuit generates a first cancellation signal representative of an output of the first transmitter such that the first cancellation signal in combination with a received signal for the first radar detector together result in a reduced level of first transmitter signal impairment within the first radar detector.

28. The wireless communications system of claim 1 further comprising:

a second radio resource controller, wherein the second radio resource controller comprises the first controller associated with the second transmitter;

and wherein the second radio resource controller is capable of causing an adjustment of at least one adjustable parameter associated with the transmission of the second transmitter based upon at least one additional link quality input and the first radar detection result.

29. The wireless communications system of claim 24 further comprising:

a first radio resource controller, wherein the first radio resource controller comprises the second controller associated with the first transmitter;

and wherein the first radio resource controller is capable of causing an adjustment of at least one adjustable parameter associated with the transmission of the first transmitter based upon at least one additional link quality input and the second radar detection result.

30. The wireless communications system of claim 1 wherein the first radar detector is configured to be not transmit-impaired by the second transmitter when the second transmitter transmits, at least in part due to an antenna pattern of the first radar detector relative to the antenna pattern of the second transmitter.

31. The wireless communications system of claim 4 wherein the at least one adjustable parameter associated with the transmission of the second transmitter is a channel bandwidth.

32. The wireless communications system of claim 10 wherein the radar detection message, control frame or status indicates a transmission frequency of the at least one detected radar signal within the first radar detection frequency range.

33. The wireless communications system of claim 1 wherein the first transceiver further comprises the first radar detector.

34. The wireless communications system of claim 22 wherein the first transceiver further comprises the second radar detector.

35. The wireless communications system of claim 26 wherein the second transceiver further comprises the third radar detector.

36. The wireless communications system of claim 26 wherein the third controller is comprised within the second controller.

37. The wireless communications system of claim 27 wherein the first transceiver further comprises the first cancellation circuit.

38. The wireless communications system of claim 1 further comprising:

a second cancellation circuit, wherein the second cancellation circuit is coupled to at least the first radar detector;

and wherein the second cancellation circuit generates a second cancellation signal representative of an output of the second transmitter such that the second cancellation signal in combination with a received signal for the first radar detector together result in a reduced level of second transmitter signal impairment within the first radar detector.

39. The wireless communications system of claim 29 wherein the first transceiver further comprises the first radio resource controller.

40. The wireless communications system of claim 28 wherein the second transceiver further comprises the second radio resource controller.

41. The wireless communications system of claim 1 wherein the first transmit frequency band is coincident with the second transmit frequency band.

42. The wireless communications system of claim 1 wherein the first radar detection frequency range is coincident with the second transmit channel.

43. The wireless communications system of claim 4 wherein the at least one adjustable parameter associated with the transmission of the second transmitter is a time of transmission.

44. The wireless communications system of claim 20 wherein the second transceiver further comprises the second radar detector.

45. The wireless communications system of claim 1 wherein the first radar detector communicates at least the first radar detection result to the second receiver via the first transmitter.

46. The wireless communications system of claim 22 wherein the second radar detector communicates at least the second radar detection result to the second receiver via the first transmitter.

47. The wireless communications system of claim 26 wherein the third radar detector communicates at least the third radar detection result to the first receiver via the second transmitter.

48. The wireless communications system of claim 27 further comprising:

a second cancellation circuit, wherein the second cancellation circuit is coupled to at least the first radar detector;

and wherein the second cancellation circuit generates a second cancellation signal representative of an output of the second transmitter such that the second cancellation signal in combination with a received signal for the first radar detector together result in a reduced level of second transmitter signal impairment within the first radar detector.

49. The wireless communication system of claim 48 where the second cancellation circuit is comprised within the first cancellation circuit.

50. A wireless communications system comprising:

a first transceiver, wherein the first transceiver comprises a first transmitter and a first receiver, and wherein the first transmitter transmits on a first transmit channel;

a second transceiver, wherein the second transceiver comprises a second transmitter and a second receiver, and wherein the second transmitter transmits on a second transmit channel;

wherein the first receiver receives from the second transmitter on the second transmit channel and the second receiver receives from the first transmitter on the first transmit channel;

wherein the first transmit channel is within a first transmit frequency band and the second transmit channel is within a second transmit frequency band;

a first radar detector, wherein the first radar detector is configured to detect radar signals within a first radar detection frequency range that includes at least part of the second transmit frequency band;

wherein the first radar detector is configured to detect radar signals within at least a first time period, the first time period comprising at least a first period of time when the first transmitter and the second transmitter both transmit coincident in time;

wherein the first radar detector communicates at least a first radar detection result to the second receiver;

wherein the first radar detection result is an input to a first controller associated with the second transmitter; and

wherein the first controller controls a transmission from the second transmitter based on the first radar detection result; and

wherein the first radar detector is configured to be not transmit-impaired by the second transmitter when the second transmitter transmits, at least in part due to a physical separation of the first radar detector and the second transmitter; and

wherein the first radar detector is configured to be not transmit-impaired by the first transmitter when the first transmitter transmits, at least in part due to a physical separation of the first radar detector and the first transmitter.

51. A wireless communications system comprising:

a first transceiver, wherein the first transceiver comprises a first transmitter and a first receiver, and wherein the first transmitter transmits on a first transmit channel;

a second transceiver, wherein the second transceiver comprises a second transmitter and a second receiver, and wherein the second transmitter transmits on a second transmit channel;

wherein the first receiver receives from the second transmitter on the second transmit channel and the second receiver receives from the first transmitter on the first transmit channel;

wherein the first transmit channel is within a first transmit frequency band and the second transmit channel is within a second transmit frequency band;

a first radar detector, wherein the first radar detector is configured to detect radar signals within a first radar detection frequency range that includes at least part of the second transmit frequency band;

wherein the first radar detector is configured to detect radar signals within at least a first time period, the first time period comprising at least a first period of time when the first transmitter and the second transmitter both transmit coincident in time;

wherein the first radar detector communicates at least a first radar detection result to the second receiver;

wherein the first radar detection result is an input to a first controller associated with the second transmitter; and

wherein the first controller controls a transmission from the second transmitter based on the first radar detection result; and

wherein the first radar detector is configured to be not transmit-impaired by the second transmitter when the second transmitter transmits, at least in part due to a physical separation of the first radar detector and the second transmitter; and

wherein the first radar detector is configured to be not transmit-impaired by the first transmitter when the first transmitter transmits, at least in part due to an antenna pattern of the first radar detector relative to the antenna pattern of the first transmitter.