Adaptive coherent RFID reader carrier cancellation
First Claim
Patent Images
1. A method for adaptive cancellation of carrier content, comprising:
- receiving a signal;
adaptively detecting an amount of carrier content in the received signal;
generating a feedback signal for canceling out the carrier content in the incoming signal; and
introducing the feedback signal for canceling out a majority of carrier content in the signal being received.
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Abstract
Systems and methods for adaptive cancellation of carrier content includes receiving a signal, adaptively detecting an amount of carrier content in the received signal, generating a feedback signal for canceling out the carrier content in the incoming signal, and introducing the feedback signal for canceling out a majority of carrier content in the signal being received
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Citations
41 Claims
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1. A method for adaptive cancellation of carrier content, comprising:
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receiving a signal;
adaptively detecting an amount of carrier content in the received signal;
generating a feedback signal for canceling out the carrier content in the incoming signal; and
introducing the feedback signal for canceling out a majority of carrier content in the signal being received. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for adaptive cancellation of carrier content, comprising:
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an antenna for receiving a signal;
a mechanism for adaptively detecting the amplitude of the carrier content in the received signal;
a mechanism for generating a feedback signal for canceling carrier content from the signal being received, the feedback signal being generated based at least in part on the detected amplitude of the carrier content in the received signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for adaptive cancellation of carrier content, comprising:
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receiving an incoming signal comprising a backscatter signal, the backscatter signal including a data signal from a remote device, a reader carrier signal, and phase noise associated with the reader carrier signal;
analyzing the backscatter signal; and
canceling a majority of the reader carrier signal and the phase noise associated with the carrier signal from the incoming signal based in part on the analysis of the backscatter signal. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A method for adaptive cancellation of carrier content in a feedback loop with variable response times, comprising:
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at a first speed defined by a response time of the feedback loop;
outputting a carrier signal;
receiving an incoming signal;
generating a feedback signal for canceling out carrier content from the incoming signal; and
feeding the feedback signal back into the incoming signal;
at a second speed slower than the first speed;
receiving the incoming signal;
detecting variations in the carrier content of the incoming signal;
continuously adjusting the feedback signal based on the variations in the carrier content in the incoming signal for canceling the carrier content in the incoming signal. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A system for adaptive cancellation of carrier content, comprising:
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an input for receiving an incoming signal from an antenna; and
an analog mechanism for subtracting a carrier signal and its associate phase noise from the incoming signal at the input. - View Dependent Claims (40, 41)
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Specification