Systems and methods for active noise cancellation in an RFID tag reader
First Claim
1. A method of increasing the signal-to-noise-plus-interference ratio of a radio frequency tag response, the method comprising:
- receiving, with a first antenna element of a radio frequency tag reader, a radio frequency tag response, the radio frequency tag response including at least two signals, a noise-plus-interference signal and a response signal, the ratio of the response signal to the noise-plus-interference signal representing the signal-to-noise-plus-interference ratio of the received radio frequency tag response;
receiving a second noise-plus-interference signal with a second antenna element of the radio frequency tag reader; and
processing the received radio frequency tag response and the second noise-plus-interference signal to increase the signal-to-noise-plus-interference ratio of the received radio frequency tag response by reducing the noise-plus-interference signal of the received radio frequency tag response using the second noise-plus-interference signal.
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Accused Products
Abstract
Systems and methods for providing active noise cancellation in an RFID tag reader are described. In one aspect, the method features increasing the signal-to-noise-plus-interference ratio of a radio frequency tag response. The method includes receiving, with a first antenna element of a radio frequency tag reader, a radio frequency tag response having a noise-plus-interference portion and a response portion, receiving a noise-plus-interference signal with a second antenna element of the radio frequency tag reader, and processing the received radio frequency tag response and the noise-plus-interference signal to increase a signal-to-noise-plus-interference ratio of the received radio frequency tag response.
42 Citations
38 Claims
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1. A method of increasing the signal-to-noise-plus-interference ratio of a radio frequency tag response, the method comprising:
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receiving, with a first antenna element of a radio frequency tag reader, a radio frequency tag response, the radio frequency tag response including at least two signals, a noise-plus-interference signal and a response signal, the ratio of the response signal to the noise-plus-interference signal representing the signal-to-noise-plus-interference ratio of the received radio frequency tag response; receiving a second noise-plus-interference signal with a second antenna element of the radio frequency tag reader; and processing the received radio frequency tag response and the second noise-plus-interference signal to increase the signal-to-noise-plus-interference ratio of the received radio frequency tag response by reducing the noise-plus-interference signal of the received radio frequency tag response using the second noise-plus-interference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A radio frequency tag reading system employing noise-plus-interference cancellation, the system comprising:
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a radio frequency tag reader having a plurality of antenna elements, a first one of the antenna elements receiving a radio frequency tag response, the radio frequency tag response including at least two signals, a noise-plus-interference signal and a response signal, the ratio of the response signal to the noise-plus-interference signal representing the signal-to-noise-plus-interference ratio of the received radio frequency tag response, and a second one of the antenna elements receiving a second noise-plus-interference signal; and processing circuitry in communication with the radio frequency tag reader, the processing circuitry processing the received radio frequency tag response and the second noise-plus-interference signal to increase the signal-to-noise-plus-interference ratio of the received radio frequency tag response by reducing the noise-plus-interference signal of the received radio frequency tag response using the second noise-plus-interference signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A radio frequency tag reading system having noise-plus-interference cancellation, the system comprising:
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means for receiving a radio frequency tag response, the radio frequency tag response including at least two signals, a noise-plus-interference signal and a response signal, the ratio of the response signal to the noise-plus-interference signal representing the signal-to-noise-plus-interference ratio of the received radio frequency tag response; means for receiving a second noise-plus-interference signal; and means for processing the received radio frequency tag response and the second noise-plus-interference signal to increase the signal-to-noise-plus-interference ratio of the received radio frequency tag response by reducing the noise-plus-interference signal of the received radio frequency tag response using the second noise-plus-interference signal. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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Specification