Transponder interrogators, radio frequency identification device communication systems, transponder interrogator communication methods, and radio frequency identification device communication methods
First Claim
Patent Images
1. A transponder interrogator comprising:
- transmit circuitry configured to output a radio frequency interrogation signal;
receive circuitry configured to receive a radio frequency response signal communicated responsive to the radio frequency interrogation signal; and
wherein the receive circuitry is configured to sample data of the response signal according to a timing signal, to determine error information of the timing signal with respect to the response signal during a first portion of the response signal, and to adjust the timing signal using the error information during a second portion of the response signal to sample data of the second portion of the response signal, wherein the second portion of the response signal is received by the transponder interrogator after reception of the first portion of the response signal.
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Abstract
The present invention includes bit synchronizers and methods of synchronizing and calculating error. One method of synchronizing with a data signal in accordance with the present invention includes providing a data signal having a first portion and a second portion, generating a timing signal, first adjusting the timing signal during the first portion of the data signal, accumulating a history value during the first portion of the data signal, and second adjusting the timing signal during a second portion of the data signal using the history.
52 Citations
43 Claims
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1. A transponder interrogator comprising:
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transmit circuitry configured to output a radio frequency interrogation signal;
receive circuitry configured to receive a radio frequency response signal communicated responsive to the radio frequency interrogation signal; and
wherein the receive circuitry is configured to sample data of the response signal according to a timing signal, to determine error information of the timing signal with respect to the response signal during a first portion of the response signal, and to adjust the timing signal using the error information during a second portion of the response signal to sample data of the second portion of the response signal, wherein the second portion of the response signal is received by the transponder interrogator after reception of the first portion of the response signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radio frequency identification device communication system comprising:
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an interrogator configured to output a radio frequency interrogation signal;
a radio frequency identification device configured to receive the interrogation signal and to output a radio frequency response signal; and
wherein the interrogator is configured to receive the response signal, to sample a plurality of portions of the response signal using a timing signal, to adjust the timing of the timing signal during sampling of one portion of the response signal, to accumulate a history indicative of at least some of the adjustments during the sampling of the one portion, and to adjust the timing of the timing signal during sampling of an other portion of the response signal using the history. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A radio frequency identification device communication system comprising:
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an interrogator configured to output a radio frequency interrogation signal;
a radio frequency identification device configured to receive the interrogation signal and to output a radio frequency response signal responsive to the reception of the interrogation signal; and
wherein the interrogator is configured to synchronize a timing signal with the response signal to sample the response signal, wherein the interrogator is configured to adjust the timing signal responsive to timing information from the response signal to provide the synchronization during a first period of time and to adjust the timing signal responsive to information of the adjustments during the first period of time to provide the synchronization during a second period of time. - View Dependent Claims (18, 19, 20, 21)
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22. A transponder interrogator communication method comprising:
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outputting an interrogation signal using a transponder interrogator;
receiving a response signal using the transponder interrogator and responsive to the outputting;
providing a timing signal;
synchronizing the timing signal with the response signal, the synchronizing comprising first adjusting the timing signal during a first period of time;
first sampling the response signal using the first adjusted timing signal;
compiling information regarding the first adjustments to the first adjusted timing signal;
wherein the synchronizing further comprises second adjusting the timing signal according to the compiled information during a second period of time; and
second sampling the response signal using the second adjusted timing signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A radio frequency identification device communication method comprising:
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providing a radio frequency identification device and an interrogator;
outputting a radio frequency interrogation signal using the interrogator;
receiving the interrogation signal using the radio frequency identification device;
outputting a radio frequency response signal using the radio frequency identification device responsive to the receiving;
receiving the response signal using the interrogator, the receiving comprising receiving a first portion of the response signal prior to a second portion of the response signal;
sampling the first portion of the response signal using a timing signal of the interrogator;
providing error information comprising misalignment of the timing signal and bits of the first portion of the response signal using the interrogator; and
using the interrogator, sampling the second portion of the response signal using the error information. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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38. A radio frequency identification device communication method comprising:
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providing a radio frequency identification device and an interrogator;
outputting a radio frequency interrogation signal using the interrogator;
receiving the interrogation signal using the radio frequency identification device;
outputting a radio frequency response signal using the radio frequency identification device responsive to the receiving;
first sampling data from one portion of the response signal at a plurality of first moments in time; and
second sampling data from an other portion of the response signal at a plurality of second moments in time, the second sampling comprising determining the second moments in time responsive to timing information extracted from the one portion of the response signal. - View Dependent Claims (39, 40, 41, 42, 43)
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Specification