SELF INTERFERENCE CANCELLATION

• US 20160065318A1
• Filed: 04/15/2014
• Published: 03/03/2016
• Est. Priority Date: 04/15/2014
• Status: Active Grant

• Current Assignee: Empire Technology Development LLC (Allied Inventors Management, LLC)
• Original Assignee: Empire Technology Development LLC (Allied Inventors Management, LLC)
• Inventors: Lee, Hyoung-Gon
• Granted Patent: US 9,954,625 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 15/02 Reducing interference from electric apparatus by means located at or near the interfering apparatus
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex

Abstract

A method performed under control of a first device capable of full duplex radio communications may include transmitting a first frame to a second device; estimating a channel response of self interference cancellation (SIC), based, at least in part, on the first frame; and determining whether the estimated channel response is usable.

Claims

1. A method performed under control of a first device capable of full duplex radio communications, comprising:

transmitting a first frame to a second device;

estimating a channel response of self interference cancellation (SIC), based, at least in part, on the first frame; and

determining whether the estimated channel response is usable.

2. The method of claim 1, further comprising:

receiving a second frame from the second device within a predefined time after the transmission of the first frame,

wherein the determining indicates that the estimated channel response is usable.

3. The method of claim 2, further comprising:

updating a channel response of SIC with the usable estimated channel response.

4. The method of claim 2, further comprising:

performing a self interference cancellation to a signal to be received after the receiving of the second frame, based, at least in part, on the usable estimated channel response.

5. The method of claim 4, wherein the performing includes:

estimating a self interference, based, at least in part, on the usable estimated channel response; and

subtracting the estimated self interference from the signal.

6. The method of claim 2, wherein the first frame includes at least one of a data frame or a probe request frame, and

wherein the second frame includes at least one of an ACK frame or a probe response frame.

7. The method of claim 1, wherein the determining indicates that the estimated channel response is unusable, if the first device receives no frame from the second device within a predefined time after the transmission of the first frame.

8. The method of claim 7, further comprising:

discarding the unusable estimated channel response.

9. A method performed under control of a device capable of full duplex radio communications, comprising:

estimating changes of self interference;

determining an interval of re-tuning of self interference cancellation (SIC), based, at least in part, on the estimated changes of self interference; and

re-tuning the SIC at the determined interval.

10. The method of claim 9, further comprising:

estimating a degree of movement of the device,

wherein the estimating of the changes of self interference is based on the estimated degree of movement of the device.

11. The method of claim 10, wherein the estimating of the degree of movement of the device is based on at least one of a location of the device or a direction of the movement.

12. The method of claim 9, further comprising:

detecting a change on an environment of the device,

wherein the estimating of the changes of self interference is based on the detected change on the environment of the device.

13. The method of claim 12, wherein the detecting of the change on the environment of the device is based on a distance between the device and an object around the device.

14. A first device capable of full duplex radio communications, comprising:

a transmitter configured to transmit a first frame to a second device; and

a self interference cancellation controller configured to;

estimate a channel response of self interference cancellation (SIC), based, at least in part, on the first frame, and

determine whether the estimated channel response is usable.

15. The first device of claim 14, further comprising:

a receiver configured to receive a second frame from the second device within a predefined time after the transmitter transmitted the first frame,

wherein the self interference cancellation controller determines that the estimated channel response is usable.

16. The first device of claim 15, wherein the self interference cancellation controller is further configured to update a channel response of SIC with the usable estimated channel response.

17. The first device of claim 15, further comprising:

a self interference cancellation executer configured to perform a self interference cancellation to a signal to be received after the second frame is received, based, at least in part, on the usable estimated channel response.

18. The first device of claim 17, wherein the self interference cancellation executer performs the self interference cancellation by:

estimating a self interference, based, at least in part, on the usable estimated channel response; and

subtracting the estimated self interference from the signal.

19. The first device of claim 15, wherein the first frame includes at least one of a data frame or a probe request frame, and

wherein the second frame includes at least one of an ACK frame or a probe response frame.

20. The first device of claim 14, wherein the self interference cancellation controller determines that the estimated channel response is unusable, if no frame is received by the first device from the second device within a predefined time after the transmitter transmitted the first frame.

21. The first device of claim 20, wherein the self interference cancellation controller is further configured to discard the unusable estimated channel response.

22. A device capable of full duplex radio communications, comprising:

a self interference change estimator configured to estimate changes of self interference;

an interval manager configured to determine an interval of re-tuning of self interference cancellation (SIC), based, at least in part, on the estimated changes of self interference; and

a self interference cancellation manager configured to re-tune the SIC at the determined interval.

23. The device of claim 22, wherein the self interference change estimator is further configured to estimate a degree of movement of the device, and

wherein the self interference change estimator estimates the changes of self interference based on the estimated degree of movement of the device.

24. The device of claim 23, wherein the self interference change estimator estimates the degree of movement of the device based on at least one of a location of the device or a direction of the movement.

25. The device of claim 22, wherein the self interference change estimator is further configured to detect a change on an environment of the device, and

wherein the self interference change estimator estimates the changes of self interference based on the detected change on the environment of the device.

26. The device of claim 25, wherein the self interference change estimator detects the change on the environment of the device based on a distance between the device and an object around the device.

27. A computer-readable storage medium having stored thereon computer-executable instructions that, in response to execution, cause a first device capable of full duplex radio communications to perform operations, comprising:

transmitting a first frame to a second device;

estimating a channel response of self interference cancellation (SIC), based, at least in part, on the first frame;

receiving a second frame from the second device within a predefined time after the transmission of the first frame; and

determining that the estimated channel response is usable.