Method and apparatus for managing interference in a communication device
A system that incorporates teachings of the present disclosure may include, for example, a matching network including a tunable reactance circuit configured to be coupled to at least one of a transmitter portion and a receiver portion of a communication device, where the tunable reactance circuit is adjustable to a plurality of tuning states, and where the determination of a tuning state is based on whether detected signal measurements are determined to be invalid and is based on information from at least one of an open-loop or closed-loop feedback configuration of the tunable reactance circuit. Additional embodiments are disclosed.
1. A communication device, comprising:
a transceiver;
a tunable reactance circuit coupled to the transceiver; and
a controller coupled with the tunable reactance circuit, wherein the controller, responsive to executing instructions, performs operations comprising:
determining a tuning state for the tunable reactance circuit based on detected signal measurements;
determining whether the detected signal measurements are valid or invalid;
applying the tuning state to the tunable reactance circuit responsive to a determination that the detected signal measurements are valid; and
applying one of a last known valid tuning state or a default tuning state to the tunable reactance circuit responsive to a determination that the detected signal measurements are invalid.
2. The communication device of claim 1 , wherein the determining of the tuning state is based in part on a mechanical use case of the communication device.
3. The communication device of claim 1 , wherein the tunable reactance circuit comprises one or more semiconductor varactors, one or more micro-electro-mechanical systems (MEMS) varactors, one or more semiconductor switched capacitors, one or more MEMS switched capacitors, or combinations thereof.
4. The communication device of claim 1 , wherein the tunable reactance circuit comprises one or more ferroelectric capacitors.
5. The communication device of claim 1 , wherein the determining of whether the detected signal measurements are valid or invalid is based on at least one of Voltage Standing Wave Ratio data measured over a period of time, amplitude modulation, a reflected input measured during transmission and non-transmission, phase measurements outside of a standard deviation, a comparison of measured and predicted transmission power level changes, or a comparison of measured and predicted improvement in reflected loss between tuning states.
6. The communication device of claim 1 , wherein the invalidity of the detected measurements is caused by another communication device generating a signal that interferes with the communication device.
7. The communication device of claim 1 , wherein the invalidity of the detected measurements is caused by internal interference generated by the communication device.
8. The communication device of claim 1 , wherein the tunable reactance circuit comprises a signal sampling network, and wherein a signal output of the signal sampling network has a filter coupled thereto.
9. The communication device of claim 8 , wherein the signal sampling network comprises a directional coupler.
10. A communication device, comprising:
a transceiver;
a tunable reactance circuit coupled to the transceiver; and
a controller coupled with the tunable reactance circuit, wherein the controller, responsive to executing instructions, performs operations comprising:
determining a tuning state for the tunable reactance circuit based on detected signal measurements and based on a use case for the communication device;
determining whether the detected signal measurements are valid or invalid;
applying the tuning state to the tunable reactance circuit responsive to a determination that the detected signal measurements are valid; and
applying a last known valid tuning state to the tunable reactance circuit responsive to a determination that the detected signal measurements are invalid.
11. The communication device of claim 10 , wherein the determining of whether the detected signal measurements are valid or invalid is based on at least one of Voltage Standing Wave Ratio data measured over a period of time, amplitude modulation, a reflected input measured during transmission and non-transmission, phase measurements outside of a standard deviation, a comparison of measured and predicted transmission power level changes, or a comparison of measured and predicted improvement in reflected loss between tuning states.
12. A method comprising:
determining, by a processor of a communication device, a tuning state for a tunable reactance circuit from among a plurality of tuning states based on whether detected signal measurements are determined to be invalid and based on information from at least one of an open-loop or closed-loop feedback configuration of the tunable reactance circuit, wherein the processor is coupled with the tunable reactance circuit, wherein the tunable reactance circuit is coupled to at least one of a transmitter portion or a receiver portion of the communication device;
adjusting the tunable reactance circuit utilizing the tuning state responsive to a determination that the detected signal measurements are valid; and
adjusting the tunable reactance circuit utilizing a previously determined tuning state or a default tuning state responsive to a determination that the detected signal measurements are invalid.
13. The method of claim 12 , wherein the open-loop feedback configuration is based on a mechanical use case of the communication device.
14. The method of claim 12 , further comprising determining a validity of the detected signal measurements based on a comparison of measured and predicted improvement in reflected loss.
15. The method of claim 12 , further comprising determining a validity of the detected signal measurements based on Voltage Standing Wave Ratio data measured over a period of time.
16. The method of claim 12 , further comprising determining a validity of the detected signal measurements based on amplitude modulation.
17. The method of claim 12 , further comprising determining a validity of the detected signal measurements based on a reflected input level measured during transmission and non-transmission.
18. The method of claim 12 , further comprising determining a validity of the detected signal measurements based on phase measurements outside of a predetermined deviation.
19. The method of claim 12 , further comprising determining a validity of the detected signal measurements based on a comparison of measured and predicted transmission power level changes.
20. The method of claim 12 , wherein the tunable reactance circuit comprises at least one of one or more voltage tunable capacitors, one or more semiconductor varactors, one or more micro-electro-mechanical systems (MEMS) varactors, one or more semiconductor switched capacitors, one or more MEMS switched capacitors, and one or more ferroelectric capacitors.