Analog active cancellation of a wireless coupled transmit signal
First Claim
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1. An apparatus comprising:
- a quadrature phase shifter to phase shift a model of a first signal received from a first local wireless transmitter to provide a quadrature signal, said first signal to cause a coupled signal that interferes in a second signal received by a local wireless receiver from a remote wireless transmitter;
a first mixer to mix the model of the first signal with a signal received by the local receiver to provide a first mixed signal;
a second mixer to mix the quadrature signal with the signal received by the local receiver to provide a second mixed signal;
a first loop filter to integrate and low pass filter the first mixed signal to provide a first error signal;
a second loop filter to integrate and low pass filter the second mixed signal to provide a second error signal;
a first bipolar amplifier to amplify the model of the first signal in proportion to the first error signal to provide a first amplified signal;
a second bipolar amplifier to amplify the quadrature signal in proportion to the second error signal to provide a second amplified signal; and
a summer to combine the first amplified signal and the second amplified signal to provide a cancellation signal to the local wireless receiver to reduce interference in the second signal caused by the coupled signal.
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Abstract
An active cancellation device receives a model of a first signal from a local wireless transmitter. The first signal causes a coupled signal that interferes in a second signal received by a local wireless receiver from a remote wireless transmitter. The active cancellation device generates a cancellation signal based on the model of the first signal, and provides the cancellation signal to the local wireless receiver. At the local wireless receiver, the cancellation signal combines with the coupled signal and the second signal. The cancellation signal reduces the interference in the second signal caused by the coupled signal.
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Citations
17 Claims
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1. An apparatus comprising:
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a quadrature phase shifter to phase shift a model of a first signal received from a first local wireless transmitter to provide a quadrature signal, said first signal to cause a coupled signal that interferes in a second signal received by a local wireless receiver from a remote wireless transmitter;
a first mixer to mix the model of the first signal with a signal received by the local receiver to provide a first mixed signal;
a second mixer to mix the quadrature signal with the signal received by the local receiver to provide a second mixed signal;
a first loop filter to integrate and low pass filter the first mixed signal to provide a first error signal;
a second loop filter to integrate and low pass filter the second mixed signal to provide a second error signal;
a first bipolar amplifier to amplify the model of the first signal in proportion to the first error signal to provide a first amplified signal;
a second bipolar amplifier to amplify the quadrature signal in proportion to the second error signal to provide a second amplified signal; and
a summer to combine the first amplified signal and the second amplified signal to provide a cancellation signal to the local wireless receiver to reduce interference in the second signal caused by the coupled signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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phase shifting a model of a first signal received from a first local wireless transmitter to provide a quadrature signal, said first signal to cause a coupled signal that interferes in a second signal received by a local wireless receiver from a remote wireless transmitter;
mixing the model of the first signal with a signal received by the local receiver to provide a first mixed signal;
mixing the quadrature signal with the signal received by the local receiver to provide a second mixed signal;
integrating and low pass filtering the first mixed signal to provide a first error signal;
integrating and low pass filtering the second mixed signal to provide a second error signal;
amplifying the model of the first signal in proportion to the first error signal to provide a first amplified signal;
amplifying the quadrature signal in proportion to the second error signal to provide a second amplified signal; and
combining the first amplified signal and the second amplified signal to provide a cancellation signal to the local wireless receiver to reduce interference in the second signal caused by the coupled signal.
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17. A machine readable medium having stored there on machine readable instructions to implement a method comprising:
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phase shifting a model of a first signal received from a first local wireless transmitter to provide a quadrature signal, said first signal to cause a coupled signal that interferes in a second signal received by a local wireless receiver from a remote wireless transmitter;
mixing the model of the first signal with a signal received by the local receiver to provide a first mixed signal;
mixing the quadrature signal with the signal received by the local receiver to provide a second mixed signal;
integrating and low pass filtering the first mixed signal to provide a first error signal;
integrating and low pass filtering the second mixed signal to provide a second error signal;
amplifying the model of the first signal in proportion to the first error signal to provide a first amplified signal;
amplifying the quadrature signal in proportion to the second error signal to provide a second amplified signal; and
combining the first amplified signal and the second amplified signal to provide a cancellation signal to the local wireless receiver to reduce interference in the second signal caused by the coupled signal.
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Specification