Active cancellation tuning to reduce a wireless coupled transmit signal
First Claim
Patent Images
1. A method comprising:
- receiving a signal strength indicator that indicates a power level of a coupled signal from a local wireless transmitter at a local wireless receiver; and
tuning an active cancellation circuit to reduce the signal strength indicator, said active cancellation circuit to generate a cancellation signal to combine with the coupled signal at the local wireless receiver, wherein the tuning the active cancellation control signal further comprises;
measuring a first level of the signal strength indicator;
adjusting an active cancellation control signal in a first direction;
measuring a second level of the signal strength indicator;
further adjusting the active cancellation control signal in the first direction if the second level is lower than the first level; and
adjusting the active cancellation control signal in an opposite direction if the second level is higher than the first level; and
iteratively measuring the signal strength indicator and either further adjusting the active cancellation control signal or adjusting the active cancellation control signal in the opposite direction depending on a comparison of a current measurement of the signal strength indicator and a previous measurement of the signal strength indicator;
wherein the active cancellation control signal locks after adjustment of the active cancellation control signal has switched directions at least twice.
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Abstract
An active cancellation controller receives a signal strength indicator that indicates a power level of a coupled signal from a local wireless transmitter at a local wireless receiver. The active cancellation controller tunes an active cancellation circuit to reduce the signal strength indicator. The active cancellation circuit is to generate a cancellation signal to combine with the coupled signal at the local wireless receiver.
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Citations
10 Claims
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1. A method comprising:
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receiving a signal strength indicator that indicates a power level of a coupled signal from a local wireless transmitter at a local wireless receiver; and
tuning an active cancellation circuit to reduce the signal strength indicator, said active cancellation circuit to generate a cancellation signal to combine with the coupled signal at the local wireless receiver, wherein the tuning the active cancellation control signal further comprises;
measuring a first level of the signal strength indicator;
adjusting an active cancellation control signal in a first direction;
measuring a second level of the signal strength indicator;
further adjusting the active cancellation control signal in the first direction if the second level is lower than the first level; and
adjusting the active cancellation control signal in an opposite direction if the second level is higher than the first level; and
iteratively measuring the signal strength indicator and either further adjusting the active cancellation control signal or adjusting the active cancellation control signal in the opposite direction depending on a comparison of a current measurement of the signal strength indicator and a previous measurement of the signal strength indicator;
wherein the active cancellation control signal locks after adjustment of the active cancellation control signal has switched directions at least twice.
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2. A method comprising:
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receiving a signal strength indicator that indicates a power level of a coupled signal from a local wireless transmitter at a local wireless receiver; and
tuning an active cancellation circuit to reduce the signal strength indicator, said active cancellation circuit to generate a cancellation signal to combine with the coupled signal at the local wireless receiver, wherein the tuning the active cancellation control signal further comprises;
measuring a first level of the signal strength indicator;
adjusting an active cancellation control signal in a first direction;
measuring a second level of the signal strength indicator;
further adjusting the active cancellation control signal in the first direction if the second level is lower than the first level; and
adjusting the active cancellation control signal in an opposite direction if the second level is higher than the first level; and
iteratively measuring the signal strength indicator and either further adjusting the active cancellation control signal or adjusting the active cancellation control signal in the opposite direction depending on a comparison of a current measurement of the signal strength indicator and a previous measurement of the signal strength indicator;
wherein the active cancellation control signal comprises a first dimension control signal, and wherein tuning the active cancellation signal further comprises;
iteratively measuring the signal strength indicator and either adjusting a second dimension control signal in the first direction or adjusting the second dimension control signal in the opposite direction depending on a comparison of a current measurement of the signal strength indicator and a previous measurement of a signal strength indicator. - View Dependent Claims (3)
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4. A method comprising:
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receiving a signal strength indicator that indicates a power level of a coupled signal from a local wireless transmitter at a local wireless receiver; and
tuning an active cancellation circuit to reduce the signal strength indicator, said active cancellation circuit to generate a cancellation signal to combine with the coupled signal at the local wireless receiver, wherein the tuning the active cancellation control signal further comprises;
measuring a first level of the signal strength indicator;
adjusting an active cancellation control signal in a first direction;
measuring a second level of the signal strength indicator;
further adjusting the active cancellation control signal in the first direction if the second level is lower than the first level; and
adjusting the active cancellation control signal in an opposite direction if the second level is higher than the first level; and
iteratively measuring the signal strength indicator and either further adjusting the active cancellation control signal or adjusting the active cancellation control signal in the opposite direction depending on a comparison of a current measurement of the signal strength indicator and a previous measurement of the signal strength indicator;
wherein the active cancellation control signal is initially adjusted by a first step size and adjusted by a smaller step size once the active cancellation control signal has locked at least once.
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5. A method comprising:
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receiving a signal strength indicator that indicates a power level of a coupled signal from a local wireless transmitter at a local wireless receiver; and
tuning an active cancellation circuit to reduce the signal strength indicator, said active cancellation circuit to generate a cancellation signal to combine with the coupled signal at the local wireless receiver, wherein the tuning the active cancellation control signal further comprises;
measuring a first level of the signal strength indicator;
adjusting an active cancellation control signal in a first direction;
measuring a second level of the signal strength indicator;
further adjusting the active cancellation control signal in the first direction if the second level is lower than the first level; and
adjusting the active cancellation control signal in an opposite direction if the second level is higher than the first level; and
iteratively measuring the signal strength indicator and either further adjusting the active cancellation control signal or adjusting the active cancellation control signal in the opposite direction depending on a comparison of a current measurement of the signal strength indicator and a previous measurement of the signal strength indicator;
wherein the signal strength indicator is initially measured over a first integration time and measured over a longer integration time once the active cancellation control signal has locked at least once.
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6. A method comprising:
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receiving a signal strength indicator that indicates a power level of a coupled signal from a local wireless transmitter at a local wireless receiver;
tuning an active cancellation circuit to reduce the signal strength indicator, said active cancellation circuit to generate a cancellation signal to combine with the coupled signal at the local wireless receiver; and
enabling tuning only when the local wireless transmitter is an only local wireless transmitter that is transmitting and when the local wireless receiver is not being used to receive a signal from a remote transmitter.
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7. A method comprising:
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receiving a signal strength indicator that indicates a power level of a coupled signal from a local wireless transmitter at a local wireless receiver;
tuning an active cancellation circuit to reduce the signal strength indicator, said active cancellation circuit to generate a cancellation signal to combine with the coupled signal at the local wireless receiver wherein tuning the active cancellation circuit comprises making adjustments to an active cancellation control signal, the method further comprising;
detecting when at least one local wireless transmitter is transmitting and the local wireless receive is being used to receive a signal from a remote transmitter; and
providing the active cancellation control signal at a particular level. - View Dependent Claims (8, 9, 10)
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Specification