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US 2008/0278293 A1Published application
Rfid tag, interrogator and system with improved symbol encoding and decoding
OwnerVitaly Druckerinventor
Life of this patent
Estimating the term…
Abstract
An improved RFID Tag, Interrogator, and system wherein at least one tag modulates a radio frequency signal by modulated backscatter operations.
Claims12
1-40. (canceled)
An RFID tag, comprising:
- 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.
3 more elements
42-52. (canceled)
An RFID tag, comprising:
- 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.
1 more element
The RFID tag of claim 13, wherein:
- the first-type bi-phase baseband waveform has a phase inversion in the middle of each data-1 symbol and lacks a phase inversion in the middle of each data-0 symbol.
61-96. (canceled)
Dependencies are inferred from the claim text.