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US 8,013,715 B2Granted
Canceling self-jammer signals in an RFID system
AssigneeIntel Corporation
InventorsScott Chiu, Mohammed Sajid, Issy Kipnis
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Abstract
A device and method for canceling one or more self-jammer signals in a radio-frequency identification system.
Claims12
A method for canceling self-jammer signals in a radio frequency identification (RFID) system, comprising:
- generating a first radio-frequency signal comprising a signal generated at a local oscillator of an RFID reader;
- transmitting the first radio-frequency signal;
- receiving a second radio-frequency signal comprising one or more self-jammer signals, the one or more self-jammer signals comprising the transmitted signal;
- detecting characteristics of the one or more self-jammer signals;
- generating a self-jammer cancellation signal comprising the signal generated at the local oscillator and based, at least in part, on the detected characteristics of the one or more self-jammer signals;
- canceling the one or more self-jammer signals in a cancellation loop, wherein canceling the one or more self-jammer signals comprises out-phasing the self-jammer signal with the self-jammer cancellation signal;
- and
- shifting a phase of a transmit signal based at least in part on characteristics detected in the detection circuit.
5 more elements
An apparatus capable of canceling self-jammer signals, comprising:
- a self-jammer cancellation circuit for canceling a self-jammer signal using a signal generated by a local oscillator, wherein the self-jammer cancellation circuit comprises:
- a receiver coupled to a detection circuit, the receiver capable of receiving a radio-frequency signal comprising one or more self-jammer signals and further capable of communicating the radio-frequency signal to the detection circuit;
- the detection circuit coupled to a local oscillator, the detection circuit capable of detecting characteristics of the one or more self-jammer signals and communicating the characteristics to a controller of the local oscillator;
- the local oscillator coupled to a summing node, the local oscillator capable of generating a self-jammer cancellation signal;
- the summing node capable of out-phasing the one or more self-jammer signals with the self-jammer cancellation signal;
- and
- a transmitter coupled to the detection circuit, the transmitter comprising an up-conversion mixer capable of shifting a phase of a transmit signal based at least in part on characteristics detected in the detection circuit.
4 more elements
Dependencies are inferred from the claim text.