RADAR DETECTION

• US 20150063321A1
• Filed: 08/27/2014
• Published: 03/05/2015
• Est. Priority Date: 09/04/2013
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: SADEK, Ahmed Kamel, YAVUZ, Mehmet
• Application Number:
  US14/469,834
• Publication Number:
  US 20150063321A1
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: G01S 7/021 Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04K 2203/16 for telephony
• CPC Class Codes: H04K 2203/18 for wireless local area networks or WLAN
• 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 3/822 by detecting the presence of a surveillance, interception or detection
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio channels
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

Systems and methods for radar detection in a communication environment are disclosed. The radar detection may comprise, for example: receiving a first signal; identifying the first signal as a potential radar signal; limiting transmission by an apparatus as a result of the identification; receiving a second signal while the transmission by the apparatus is limited; and determining whether at least one of the first signal, the second signal, or a combination thereof is a radar signal.

Claims

1. A method of radar detection in a communication environment, comprising:

receiving a first signal;

identifying the first signal as a potential radar signal;

limiting transmission by an apparatus as a result of the identification;

receiving a second signal while the transmission by the apparatus is limited; and

determining whether at least one of the first signal, the second signal, or a combination thereof is a radar signal.

2. The method of claim 1, wherein:

the identification of the first signal as a potential radar signal comprises detecting at least one potential radar pulse; and

the determination of whether at least one of the first signal, the second signal, or a combination thereof is a radar signal comprises detecting a radar pulse burst pattern.

3. The method of claim 1, wherein:

the identification of the first signal as a potential radar signal comprises a preliminary determination that radar signals are being received; and

the determination of whether at least one of the first signal, the second signal, or a combination thereof is a radar signal comprises a final determination that radar signals are being received.

4. The method of claim 1, wherein the limitation of transmission comprises transmitting a message to the apparatus requesting that the apparatus limit transmission.

5. The method of claim 1, wherein the limitation of transmission comprises at least one of:

ceasing scheduling of transmissions for the apparatus;

ceasing issuance of grants in response to requests to schedule transmissions received from the apparatus;

reducing transmit power of the apparatus;

limiting resources for transmissions by the apparatus;

switching from periodic channel quality reporting to aperiodic channel quality reporting;

or

reducing a transmit-to-receive duty cycle for time division duplex communication.

6. The method of claim 1, wherein the identification of the first signal as a potential radar signal comprises determining whether a defined quantity of pulses were received within a defined period of time.

7. The method of claim 1, wherein the identification of the first signal as a potential radar signal comprises at least one of:

determining whether a bandwidth characteristic of the first signal corresponds to a bandwidth characteristic of a radar pulse;

or

determining whether a frequency characteristic of the first signal corresponds to a frequency characteristic of a radar pulse.

8. The method of claim 1, wherein the determination of the first signal as a potential radar signal comprises at least one of:

determining whether a received signal strength characteristic of the first signal corresponds to a received signal strength characteristic of a radar signal;

determining whether a pulse width characteristic of the first signal corresponds to a pulse width characteristic of a radar signal;

determining whether a pulse repetition interval characteristic of the first signal corresponds to a pulse repetition interval characteristic of a radar signal;

or

determining whether a chirp characteristic of the first signal corresponds to a chirp characteristic of a radar signal.

9. The method of claim 1, wherein the determination of whether at least one of the first signal, the second signal, or a combination thereof is a radar signal comprises at least one of:

determining whether a bandwidth characteristic of the first signal, the second signal, or a combination thereof corresponds to a bandwidth characteristic of a radar pulse;

determining whether a frequency characteristic of the first signal, the second signal, or a combination thereof corresponds to a frequency characteristic of a radar pulse;

determining whether a received signal strength characteristic of the first signal, the second signal, or a combination thereof corresponds to a received signal strength characteristic of a radar signal;

determining whether a pulse width characteristic of the first signal, the second signal, or a combination thereof corresponds to a pulse width characteristic of a radar signal;

determining whether a pulse repetition interval characteristic of the first signal, the second signal, or a combination thereof corresponds to a pulse repetition interval characteristic of a radar signal;

or

determining whether a chirp characteristic of the first signal, the second signal, or a combination thereof corresponds to a chirp characteristic of a radar signal.

10. The method of claim 1, further comprising switching communication from a first channel to a second channel based on the determination of whether at least one of the first signal, the second signal, or a combination thereof is a radar signal.

11. An apparatus for radar detection in a communication environment, comprising:

a receiver configured to receive a first signal;

a processor configured to;

identify the first signal as a potential radar signal, and

limit transmission by an apparatus as a result of the identification;

wherein;

the receiver is further configured to receive a second signal while the transmission by the apparatus is limited, and

the processor is further configured to determine whether at least one of the first signal, the second signal, or a combination thereof is a radar signal.

12. The apparatus of claim 11, wherein:

the processor is configured to identify the first signal as a potential radar signal by detecting at least one potential radar pulse; and

the processor is configured to determine whether at least one of the first signal, the second signal, or a combination thereof is a radar signal by detecting a radar pulse burst pattern.

13. The apparatus of claim 11, wherein:

the processor is configured to identify the first signal as a potential radar signal by making a preliminary determination that radar signals are being received; and

the processor is configured to determine whether at least one of the first signal, the second signal, or a combination thereof is a radar signal by making a final determination that radar signals are being received.

14. The apparatus of claim 11, wherein the processor is configured to limit transmission by causing a transmitter to transmit a message to the apparatus requesting that the apparatus limit transmission.

15. The apparatus of claim 11, wherein the processor is configured to limit transmission by at least one of:

ceasing scheduling of transmissions for the apparatus;

ceasing issuance of grants in response to requests to schedule transmissions received from the apparatus;

reducing transmit power of the apparatus;

limiting resources for transmissions by the apparatus;

switching from periodic channel quality reporting to aperiodic channel quality reporting;

or

reducing a transmit-to-receive duty cycle for time division duplex communication.

16. The apparatus of claim 11, wherein the processor is configured to identify the first signal as a potential radar signal by determining whether a defined quantity of pulses were received within a defined period of time.

17. The apparatus of claim 11, wherein the processor is configured to identify the first signal as a potential radar signal by at least one of:

determining whether a bandwidth characteristic of the first signal corresponds to a bandwidth characteristic of a radar pulse;

or

determining whether a frequency characteristic of the first signal corresponds to a frequency characteristic of a radar pulse.

18. The apparatus of claim 11, wherein the processor is configured to determine the first signal as a potential radar signal by at least one of:

determining whether a received signal strength characteristic of the first signal corresponds to a received signal strength characteristic of a radar signal;

determining whether a pulse width characteristic of the first signal corresponds to a pulse width characteristic of a radar signal;

determining whether a pulse repetition interval characteristic of the first signal corresponds to a pulse repetition interval characteristic of a radar signal;

or

determining whether a chirp characteristic of the first signal corresponds to a chirp characteristic of a radar signal.

19. The apparatus of claim 11, wherein the processor is configured to determine whether at least one of the first signal, the second signal, or a combination thereof is a radar signal by at least one of:

determining whether a bandwidth characteristic of the first signal, the second signal, or a combination thereof corresponds to a bandwidth characteristic of a radar pulse;

determining whether a frequency characteristic of the first signal, the second signal, or a combination thereof corresponds to a frequency characteristic of a radar pulse;

determining whether a received signal strength characteristic of the first signal, the second signal, or a combination thereof corresponds to a received signal strength characteristic of a radar signal;

determining whether a pulse width characteristic of the first signal, the second signal, or a combination thereof corresponds to a pulse width characteristic of a radar signal;

determining whether a pulse repetition interval characteristic of the first signal, the second signal, or a combination thereof corresponds to a pulse repetition interval characteristic of a radar signal;

or

determining whether a chirp characteristic of the first signal, the second signal, or a combination thereof corresponds to a chirp characteristic of a radar signal.

20. The apparatus of claim 11, wherein the processor is further configured to switch communication from a first channel to a second channel based on the determination of whether at least one of the first signal, the second signal, or a combination thereof is a radar signal.

21. An apparatus for radar detection in a communication environment, comprising:

means for receiving a first signal;

means for identifying the first signal as a potential radar signal;

means for limiting transmission by an apparatus as a result of the identification;

means for receiving a second signal while the transmission by the apparatus is limited; and

means for determining whether at least one of the first signal, the second signal, or a combination thereof is a radar signal.

22. The apparatus of claim 21, wherein:

the means for identifying the first signal as a potential radar signal comprises means for detecting at least one potential radar pulse; and

the means for determining whether at least one of the first signal, the second signal, or a combination thereof is a radar signal comprises means for detecting a radar pulse burst pattern.

23. The apparatus of claim 21, wherein:

the means for identifying the first signal as a potential radar signal comprises means for making a preliminary determination that radar signals are being received; and

the means for determining whether at least one of the first signal, the second signal, or a combination thereof is a radar signal comprises means for making a final determination that radar signals are being received.

24. The apparatus of claim 21, wherein the means for limiting transmission comprises means for transmitting a message to the apparatus requesting that the apparatus limit transmission.

25. The apparatus of claim 21, wherein the means for limiting transmission comprises at least one of:

means for ceasing scheduling of transmissions for the apparatus;

means for ceasing issuance of grants in response to requests to schedule transmissions received from the apparatus;

means for reducing transmit power of the apparatus;

means for limiting resources for transmissions by the apparatus;

means for switching from periodic channel quality reporting to aperiodic channel quality reporting;

or

means for reducing a transmit-to-receive duty cycle for time division duplex communication.

26. The apparatus of claim 21, wherein means for identifying the first signal as a potential radar signal comprises means for determining whether a defined quantity of pulses were received within a defined period of time.

27. The apparatus of claim 21, wherein the means for identifying the first signal as a potential radar signal comprises at least one of:

means for determining whether a bandwidth characteristic of the first signal corresponds to a bandwidth characteristic of a radar pulse;

or

means for determining whether a frequency characteristic of the first signal corresponds to a frequency characteristic of a radar pulse.

28. The apparatus of claim 21, wherein the means for determining the first signal as a potential radar signal comprises at least one of:

means for determining whether a received signal strength characteristic of the first signal corresponds to a received signal strength characteristic of a radar signal;

means for determining whether a pulse width characteristic of the first signal corresponds to a pulse width characteristic of a radar signal;

means for determining whether a pulse repetition interval characteristic of the first signal corresponds to a pulse repetition interval characteristic of a radar signal;

or

means for determining whether a chirp characteristic of the first signal corresponds to a chirp characteristic of a radar signal.

29. The apparatus of claim 21, wherein the means for determining whether at least one of the first signal, the second signal, or a combination thereof is a radar signal comprises at least one of:

means for determining whether a bandwidth characteristic of the first signal, the second signal, or a combination thereof corresponds to a bandwidth characteristic of a radar pulse;

means for determining whether a frequency characteristic of the first signal, the second signal, or a combination thereof corresponds to a frequency characteristic of a radar pulse;

means for determining whether a received signal strength characteristic of the first signal, the second signal, or a combination thereof corresponds to a received signal strength characteristic of a radar signal;

means for determining whether a pulse width characteristic of the first signal, the second signal, or a combination thereof corresponds to a pulse width characteristic of a radar signal;

means for determining whether a pulse repetition interval characteristic of the first signal, the second signal, or a combination thereof corresponds to a pulse repetition interval characteristic of a radar signal;

or

means for determining whether a chirp characteristic of the first signal, the second signal, or a combination thereof corresponds to a chirp characteristic of a radar signal.

30. The apparatus of claim 21, further comprising means for switching communication from a first channel to a second channel based on the determination of whether at least one of the first signal, the second signal, or a combination thereof is a radar signal.

31. A non-transitory computer-readable medium comprising instructions, which, when executed by a processor, causes the process to perform operations for radar detection in a communication environment, the non-transitory computer-readable medium comprising:

instructions for receiving a first signal;

instructions for identifying the first signal as a potential radar signal;

instructions for limiting transmission by an non-transitory computer-readable medium as a result of the identification;

instructions for receiving a second signal while the transmission by the non-transitory computer-readable medium is limited; and

instructions for determining whether at least one of the first signal, the second signal, or a combination thereof is a radar signal.

32. The non-transitory computer-readable medium of claim 31, wherein:

the instructions for identifying the first signal as a potential radar signal comprise instructions for detecting at least one potential radar pulse; and

the instructions for determining whether at least one of the first signal, the second signal, or a combination thereof is a radar signal comprise instructions for detecting a radar pulse burst pattern.

33. The non-transitory computer-readable medium of claim 31, wherein:

the instructions for identifying the first signal as a potential radar signal comprise instructions for making a preliminary determination that radar signals are being received; and

the instructions for determining whether at least one of the first signal, the second signal, or a combination thereof is a radar signal comprise instructions for making a final determination that radar signals are being received.

34. The non-transitory computer-readable medium of claim 31, wherein the instructions for limiting transmission comprise instructions for transmitting a message to the non-transitory computer-readable medium requesting that the non-transitory computer-readable medium limit transmission.

35. The non-transitory computer-readable medium of claim 31, wherein the instructions for limiting transmission comprises at least one of:

instructions for ceasing scheduling of transmissions for the non-transitory computer-readable medium;

instructions for ceasing issuance of grants in response to requests to schedule transmissions received from the non-transitory computer-readable medium;

instructions for reducing transmit power of the non-transitory computer-readable medium;

instructions for limiting resources for transmissions by the non-transitory computer-readable medium;

instructions for switching from periodic channel quality reporting to aperiodic channel quality reporting;

or

instructions for reducing a transmit-to-receive duty cycle for time division duplex communication.

36. The non-transitory computer-readable medium of claim 31, wherein instructions for identifying the first signal as a potential radar signal comprise instructions for determining whether a defined quantity of pulses were received within a defined period of time.

37. The non-transitory computer-readable medium of claim 31, wherein the instructions for identifying the first signal as a potential radar signal comprises at least one of:

instructions for determining whether a bandwidth characteristic of the first signal corresponds to a bandwidth characteristic of a radar pulse;

or

instructions for determining whether a frequency characteristic of the first signal corresponds to a frequency characteristic of a radar pulse.

38. The non-transitory computer-readable medium of claim 31, wherein the instructions for determining the first signal as a potential radar signal comprises at least one of:

instructions for determining whether a received signal strength characteristic of the first signal corresponds to a received signal strength characteristic of a radar signal;

instructions for determining whether a pulse width characteristic of the first signal corresponds to a pulse width characteristic of a radar signal;

instructions for determining whether a pulse repetition interval characteristic of the first signal corresponds to a pulse repetition interval characteristic of a radar signal;

or

instructions for determining whether a chirp characteristic of the first signal corresponds to a chirp characteristic of a radar signal.

39. The non-transitory computer-readable medium of claim 31, wherein the instructions for determining whether at least one of the first signal, the second signal, or a combination thereof is a radar signal comprises at least one of:

instructions for determining whether a bandwidth characteristic of the first signal, the second signal, or a combination thereof corresponds to a bandwidth characteristic of a radar pulse;

instructions for determining whether a frequency characteristic of the first signal, the second signal, or a combination thereof corresponds to a frequency characteristic of a radar pulse;

instructions for determining whether a received signal strength characteristic of the first signal, the second signal, or a combination thereof corresponds to a received signal strength characteristic of a radar signal;

instructions for determining whether a pulse width characteristic of the first signal, the second signal, or a combination thereof corresponds to a pulse width characteristic of a radar signal;

instructions for determining whether a pulse repetition interval characteristic of the first signal, the second signal, or a combination thereof corresponds to a pulse repetition interval characteristic of a radar signal;

or

instructions for determining whether a chirp characteristic of the first signal, the second signal, or a combination thereof corresponds to a chirp characteristic of a radar signal.

40. The non-transitory computer-readable medium of claim 31, further comprising instructions for switching communication from a first channel to a second channel based on the determination of whether at least one of the first signal, the second signal, or a combination thereof is a radar signal.