ADJUSTING PARAMETERS ASSOCIATED WITH LEAKAGE SIGNALS
First Claim
1. An RFID reader comprising:
- a RF antenna;
a transmitter section coupled to the RF antenna and operable to generate a transmit signal to be transmitted by the RF antenna;
a receiver section coupled to the RF antenna and operable to receive a receive signal from the RF antenna, the receiver section further comprising;
a de-rotation module operable to de-rotate, by θ
, an in-phase signal and quadrature signal associated with the leakage signal; and
a control module operable to generate control signals used to produce a signal for reducing the leakage signal in a receive path of the reader; and
a carrier noise reduction (CNR) section operable to subtract the reduction signal from the leakage signal.
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Accused Products
Abstract
The present disclosure includes a system and method for adjusting parameters associated with leakage signals. In some implementations, an RFID reader includes an RF antenna, a transmitter section, a receiver section, a control module and a cancellation noise reduction (CNR) section. The transmitter section is coupled to the RF antenna and operable to generate a transmit signal to be transmitted by the RF antenna. The receiver section is coupled to the RF antenna and operable to receive a receive signal from the RF antenna. In addition, the receiver section further includes a de-rotation module and a control module. The de-rotation module is operable to de-rotate, by θ, an in-phase signal and quadrature signal associated with the leakage signal. The control module is operable to generate control signals used to produce a signal for reducing the leakage signal in a receive path of the reader. The CNR section is operable to subtract from the reduction signal from the leakage signal.
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Citations
20 Claims
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1. An RFID reader comprising:
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a RF antenna; a transmitter section coupled to the RF antenna and operable to generate a transmit signal to be transmitted by the RF antenna; a receiver section coupled to the RF antenna and operable to receive a receive signal from the RF antenna, the receiver section further comprising; a de-rotation module operable to de-rotate, by θ
, an in-phase signal and quadrature signal associated with the leakage signal; anda control module operable to generate control signals used to produce a signal for reducing the leakage signal in a receive path of the reader; and a carrier noise reduction (CNR) section operable to subtract the reduction signal from the leakage signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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transmitting an RF signal in an interrogation zone; downconverting an RF signal on a receive path to an in-phase and a quadrature signal; determining a phase-shift offset associated with leakage signals from the transmitted RF signal; de-rotating the in-phase signal and the quadrature signal using the determine phase-shift offset; generating control signals used to produce a signal for reducing the leakage signal in the receive path based, at least in part, on the de-rotated in-phase signal and the de-rotated quadrature signal; and subtracting the reduction signal from the leakage signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification