RFID tag, interrogator and system with improved symbol encoding and decoding
First Claim
Patent Images
1. An RFID tag, comprising:
- at least one antenna element;
signal generation means that operates in a first mode of operation and a second mode of operation to generate a signal that represents a sequence of symbols,wherein in said first mode of operation the signal is generated in accordance with a first signaling scheme wherein the signal is derived by multiplication of a first-type bi-phase baseband waveform and a square wave, wherein the first-type bi-phase baseband waveform has a first symbol rate SR1, wherein the square wave has a rate M*SR1, where M is selected from a number of different integer values, and wherein the first-type bi-phase baseband waveform has a phase inversion at least on every symbol boundary, andwherein in said second mode of operation the signal is generated in accordance with a second signaling scheme wherein the signal comprises a second-type bi-phase baseband waveform having a second symbol rate SR2 different from said first symbol rate SR1, and wherein the second-type bi-phase baseband waveform has a phase inversion at least on every symbol boundary; and
modulation means, operably coupled between the signal generation means and the at least one antenna element, for modulating a backscatter signal transmitted at the at least one antenna element in accordance with the signal generated by the signal generation means.
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Abstract
An improved RFID Tag, Interrogator, and system wherein at least one tag modulates a radio frequency signal by modulated backscatter operations.
23 Citations
18 Claims
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1. An RFID tag, comprising:
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at least one antenna element; signal generation means that operates in a first mode of operation and a second mode of operation to generate a signal that represents a sequence of symbols, wherein in said first mode of operation the signal is generated in accordance with a first signaling scheme wherein the signal is derived by multiplication of a first-type bi-phase baseband waveform and a square wave, wherein the first-type bi-phase baseband waveform has a first symbol rate SR1, wherein the square wave has a rate M*SR1, where M is selected from a number of different integer values, and wherein the first-type bi-phase baseband waveform has a phase inversion at least on every symbol boundary, and wherein in said second mode of operation the signal is generated in accordance with a second signaling scheme wherein the signal comprises a second-type bi-phase baseband waveform having a second symbol rate SR2 different from said first symbol rate SR1, and wherein the second-type bi-phase baseband waveform has a phase inversion at least on every symbol boundary; and modulation means, operably coupled between the signal generation means and the at least one antenna element, for modulating a backscatter signal transmitted at the at least one antenna element in accordance with the signal generated by the signal generation means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 18)
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9. An RFID tag, comprising:
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at least one antenna element; signal generation means that generates a signal employing a bi-phase signaling scheme, wherein the signal is derived by multiplication of a bi-phase baseband waveform and a square wave, wherein the bi-phase baseband waveform has a first symbol rate SR1, and wherein the square wave has a rate M*SR1, where M is selected from a number of different integer values, and wherein the bi-phase baseband waveform has a phase inversion at least on every symbol boundary; and modulation means, operably coupled between the signal generation means and the at least one antenna element, for modulating a backscatter signal transmitted at the at least one antenna element in accordance with the signal generated by the signal generation means. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification