Self interference cancellation
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.
1. A method performed under control of a device capable of full duplex radio communications, the method comprising:
estimating a change of self interference;
determining an interval of re-tuning of self interference cancellation (SIC),
wherein the determining the interval of re-tuning of the SIC is based at least in part on the estimated change of the self interference, and
wherein the determining the interval of the SIC includes at least one of:
decreasing the interval of re-tuning of the SIC, in response to the estimated change of self interference being indicative of an increase of the self interference, or
increasing the interval of re-tuning of the SIC, in response to the estimated change of self interference being indicative of a decrease of the self interference; and
re-tuning the SIC after the determined interval.
2. The method of claim 1 , further comprising:
estimating a degree of movement of the device,
wherein the estimating the change of the self interference is based on the estimated degree of movement of the device.
3. The method of claim 2 , wherein the estimating 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.
4. The method of claim 1 , further comprising:
detecting a change in an environment of the device,
wherein the estimating the change of the self interference is based on the detected change in the environment of the device.
5. The method of claim 4 , wherein the detecting the change in the environment of the device is based on a distance between the device and an object near the device.
6. A device capable of full duplex radio communications, the device comprising:
a transceiver capable to perform simultaneous signal transmission and signal reception;
a self interference change estimator coupled to the transceiver and operable to estimate a change of self interference based on a signal transmitted by the transceiver and a corresponding signal received by the transceiver;
an interval manager coupled to the self interference change estimator and operable to determine an interval of re-tuning of self interference cancellation (SIC),
wherein the determination of the interval of re-tuning of the SIC is based at least in part on the estimated change of self interference, and
wherein the determination of the interval of the SIC includes at least one of:
a decrease of the interval of re-tuning of the SIC, in response to the estimated change of self interference being indicative of an increase of the self interference, or
an increase of the interval of re-tuning of the SIC, in response to the estimated change of self interference being indicative of a decrease of the self interference; and
a self interference cancellation manager coupled to the interval manager and operable to re-tune the SIC after the determined interval.
7. The device of claim 6 , wherein:
the self interference change estimator is further operable to estimate a degree of movement of the device, and
the self interference change estimator is operable to estimate the change of self interference based on the estimated degree of movement of the device.
8. The device of claim 7 , wherein the self interference change estimator is operable to estimate the degree of movement of the device based on at least one of: a location of the device, a direction of the movement of the device, or a speed of the movement of the device.
9. The device of claim 6 , wherein:
the self interference change estimator is further operable to detect a change in an environment of the device, and
the self interference change estimator is operable to estimate the change of self interference based on the detected change in the environment of the device.
10. The device of claim 9 , wherein the self interference change estimator is operable to detect the change in the environment of the device based on a distance between the device and an object near the device.
11. A non-transitory computer-readable medium having stored thereon computer-executable instructions, which in response to execution by a processors, cause a device capable of full duplex radio communications to perform operations comprising:
monitoring an environment of the device for a change in the environment;
detecting, based on the monitoring, a change in the environment of the device;
estimating, based on the detected change in the environment of the device, a change of self interference;
adjusting an interval of re-tuning of self interference cancellation (SIC) from a first interval to a second interval different from the first interval,
wherein the adjusting the interval of re-tuning of the SIC is based on the estimated change of the self interference, and
wherein the adjusting the interval of re-tuning of the SIC includes at least one of:
decreasing the interval of re-tuning of the SIC, in response to an increase of the self interference, or
increasing the interval of re-tuning of the SIC, in response to a decrease of the self interference; and
re-tuning the SIC after the second interval.
12. The non-transitory computer-readable medium of claim 11 , wherein the change in the environment of the device includes a change of a distance between the device and an object near the device.
13. The non-transitory computer-readable medium of claim 12 , wherein the object near the device includes an ear of a user of the device.
14. The non-transitory computer-readable medium of claim 11 , wherein the detecting the change in the environment of the device includes detecting a change in at least one of: a location of the device, a movement direction of the device, or a movement speed of the device.