METHOD AND APPARATUS FOR COMMUNICATION IN ULTRA-WIDE BANDWIDTH RFID SYSTEMS
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Abstract
A method for communication in ultra-wide bandwidth RFID systems includes the steps of generating through a transceiver device an interrogation signal composed of at least a sequence of equally time spaced pulses within a period and transmitting the signal to at least one RFID identification device which generates a response signal and transmits it back to the transceiver device. The interrogation signal is coded according to a numerical coding sequence. The response signal is generated by varying, in each period of the pulse sequence of the interrogation signal, a polarity of pulses using the numerical coding sequence. An apparatus for communication in ultra-wide bandwidth RFID systems includes a transceiver device and a RFID identification device, suitable for communicating with each other. The RFID identification device includes a backscatter modulator suitable for modulating a signal reflected by an antenna of an identification device RFID.
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Citations
49 Claims
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1-20. -20. (canceled)
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21. A method for communication in ultra-wide bandwidth RFID systems comprising the steps of
generating through a transceiver device an interrogation ultra-wide bandwidth signal, said signal comprising at least a sequence of equally time spaced pulses within a period; -
transmitting said signal to at least one RFID identification device; processing said interrogation signal according to information stored in said RFID device and transmitting it back to said transceiver device as a response signal; receiving said response signal through said transceiver device and further processing said response signal to detect said information included in said response signal; coding said interrogation signal according to a numerical coding sequence that determines a polarity of each pulse of said sequence of pulses; and generating said response signal in said RFID identification device by varying through a variation of an antenna load, in each period of said sequence of pulses of said interrogation signal, a polarity of pulses using said numerical coding sequence, so that all reflected pulses in a same period have a same polarity. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for communication in ultra-wide bandwidth RFID systems comprising the steps of
generating through a transceiver device an interrogation ultra-wide bandwidth signal, said signal comprising at least a sequence of equally time spaced pulses within a period; -
transmitting said signal to at least one RFID identification device; processing said interrogation signal according to information stored in said RFID device and transmitting it back to a transceiver device as a response signal; receiving said response signal through said transceiver device and further processing said signal to detect said information included in said response signal; generating said sequence of pulses so that all pulses of said sequence have a same polarity; generating said response signal in said RFID identification device by coding said interrogation signal according to a numerical coding sequence and to said information stored in said RFID device that determines a polarity of each pulse of said sequence of pulses by varying antenna load conditions; and decoding, in said transceiver device, said response signal by modifying, in each period of said sequence of pulses of a response signal, a polarity of pulses using said numerical coding sequence, so that all pulses within a same period have a same polarity. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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- 39. An apparatus for communication in ultra-wide bandwidth RFID systems, comprising a transceiver device and a RFID identification device suitable for communicating each other, wherein said RFID identification device comprises a backscatter modulator suitable for modulating a signal generated by said transceiver device and reflected back by an antenna of a RFID identification device, said backscatter modulator comprising a first switch placed in parallel to an antenna and a second switch, parallel to an antenna as well, and in series to a load impedance.
Specification