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US 2009/0156153 A1Published application
Adaptive coherent rfid reader carrier cancellation
AssigneeIntelleflex Corporation
InventorTareef Ibrahim Al-Mahdawi
Life of this patent
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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
Claims19
A method for adaptive cancellation of carrier content, comprising:
- outputting a carrier signal;
- receiving a first wireless incoming signal;
- at a first speed, generating a feedback signal for cancelling out carrier content from the first wireless incoming signal;
- receiving a second wireless incoming signal;
- analyzing the second wireless incoming signal;
- and
- canceling a majority of a carrier signal from the second wireless incoming signal based at least in part on the analysis of the second wireless incoming signal.
4 more elements
A method for adaptive cancellation of carrier content in a feedback loop with variable response times, comprising:
- 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.
7 more elements
A system for adaptive cancellation of carrier content, comprising:
- an input for receiving an incoming signal from an antenna;
- an analog mechanism for subtracting a carrier signal and its associate phase noise from the incoming signal, and
- a transmitter for transmitting an outgoing signal, wherein the system has an active mode and a suspended mode, operation of the analog mechanism being suspended in the suspended mode, wherein the suspended mode is invoked during modulation by the transmitter.
Dependencies are inferred from the claim text.