Near field communication method of detection of a tag presence by a tag reader
First Claim
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1. A Near Field Communication method for detecting whether a tag is present by a tag reader, the method comprising:
- stimulating an input of a transmitter of the tag reader with an input signal corresponding to an input sequence to generate an output signal of the transmitter, wherein the output signal represents the input signal convoluted by an impulse response of said transmitter under a current load condition of the transmitter;
detecting the impulse response of said transmitter;
evaluating the impulse response generated by said transmitter by comparing the impulse response to a time-varying lower limit and a time-varying upper limit of a predetermined envelope wherein the predetermined envelope is based on the input sequence; and
assessing whether a tag is present based on said comparison of the impulse response to the time-varying lower limit and the time-varying upper limit of the predetermined envelope.
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Abstract
A Near Field Communication method performed by a tag reader detects whether a tag is present. The method includes stimulating the tag reader'"'"'s transmitter to generate an impulse response, evaluating the impulse response generated by the transmitter to obtain an evaluated impulse response, and assessing whether a tag is present based on the evaluated impulse response.
9 Citations
22 Claims
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1. A Near Field Communication method for detecting whether a tag is present by a tag reader, the method comprising:
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stimulating an input of a transmitter of the tag reader with an input signal corresponding to an input sequence to generate an output signal of the transmitter, wherein the output signal represents the input signal convoluted by an impulse response of said transmitter under a current load condition of the transmitter; detecting the impulse response of said transmitter; evaluating the impulse response generated by said transmitter by comparing the impulse response to a time-varying lower limit and a time-varying upper limit of a predetermined envelope wherein the predetermined envelope is based on the input sequence; and assessing whether a tag is present based on said comparison of the impulse response to the time-varying lower limit and the time-varying upper limit of the predetermined envelope. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A non-transitory computer readable medium storing thereon a computer program comprising program instructions, which when loaded into a data-processing unit cause the data processing unit to:
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stimulate an input of a transmitter of the tag reader with an input signal corresponding to an input sequence to generate an output signal of the transmitter, wherein the output signal represents the input signal convoluted by an impulse response of said transmitter under a current load condition of the transmitter; evaluate the impulse response generated by said transmitter by comparing the impulse response to a time-varying lower limit and a time-varying upper limit of a predetermined envelope wherein the predetermined envelope is based on the predetermined input sequence; and assess whether a tag is present based on said comparison of the impulse response to the time-varying lower limit and the time-varying upper limit of the predetermined envelope. - View Dependent Claims (17, 18)
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19. A Near Field Communication tag reader, comprising:
a transmitter; an emitter configured to send a stimulating signal to an input of the transmitter so as to generate an output signal at an output of the transmitter, wherein the output signal corresponds to the stimulating signal convoluted by an impulse response of said transmitter under a current load condition of the transmitter; an evaluator configured to evaluate the impulse response by comparing the impulse response to a time-varying lower limit and a time-varying upper limit of a predetermined envelope wherein the predetermined envelope is based on the stimulating signal; an assessor configured to assess whether a tag is present based on said comparison of the impulse response to the time-varying lower limit and the time-varying upper limit of the predetermined envelope. - View Dependent Claims (20, 21, 22)
Specification