RFID TAG, INTERROGATOR AND SYSTEM WITH IMPROVED SYMBOL ENCODING AND DECODING
1 Assignment
0 Petitions
Accused Products
Abstract
An improved RFID Tag, Interrogator, and system wherein at least one tag modulates a radio frequency signal by modulated backscatter operations.
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Citations
61 Claims
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1-40. -40. (canceled)
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41. An RFID tag, comprising:
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at least one antenna element; uplink signal generation means that operates in a first mode of operation and a second mode of operation to generate an uplink signal that represents a sequence of symbols, wherein in said first mode of operation the uplink signal is generated in accordance with a first signaling scheme wherein the uplink signal is derived by multiplying a first-type bi-phase baseband waveform by a square wave, wherein the first-type bi-phase baseband waveform has a phase inversion at least on every symbol boundary and 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 in said second mode of operation the uplink signal is generated in accordance with a second signaling scheme wherein the uplink signal comprises a second-type bi-phase baseband waveform having a phase inversion at least on every symbol boundary and having a second symbol rate SR2, wherein said second symbol rate SR2 is different from said first symbol rate SR1; and modulation means, operably coupled between the uplink 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 uplink signal generated by the uplink signal generation means.
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42-52. -52. (canceled)
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53. An RFID tag, comprising:
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at least one antenna element; uplink signal generation means that generates an uplink signal employing a bi-phase signaling scheme, wherein the uplink signal is derived by multiplying a first-type bi-phase baseband waveform by a square wave, wherein the first-type bi-phase baseband waveform has a phase inversion at least on every symbol boundary and 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 modulation means, operably coupled between the uplink 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 uplink signal generated by the uplink signal generation means. - View Dependent Claims (54, 55, 56, 57, 58, 59)
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61-96. -96. (canceled)
Specification