Systems and methods for active noise cancellation in an RFID tag reader
AssigneeThingMagic, Inc.
InventorMatthew S. Reynolds
Life of this patent
Estimating the term…
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.
Claims38
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.
A radio frequency tag reading system employing noise-plus-interference cancellation, the system comprising:
- 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.
A radio frequency tag reading system having noise-plus-interference cancellation, the system comprising:
- 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.
Dependencies are inferred from the claim text.