BACKSCATTERING TYPE RFID COMMUNICATION SYSTEM
First Claim
1. A backscattering type radio frequency identification (RFID) communication system comprising:
- a plurality of RFID readers, each of the plurality of RFID readers comprising;
a reader controller generating a query signal to be transmitted to an RFID tag;
a visible ray transmitting unit transmitting the query signal transmitted by the reader controller in a form of visible rays;
a reader transmitter transmitting a carrier wave in a form of RF by selecting one from among a plurality of frequency channels; and
a reader receiver receiving a response signal in a form of RF transmitted from the RFID tag and transmitting the response signal to the reader controller; and
a plurality of RFID tags, each of the plurality of RFID tags comprising;
a visible ray receiving unit receiving the query signal transmitted by the visible ray transmitting unit of the RFID reader and converting the query signal into an electrical signal;
a tag receiver receiving the carrier wave transmitted by the reader transmitter of the RFID reader;
a tag controller processing a command of the query signal received by the visible ray receiving unit and generating a response signal with respect to the query signal; and
a tag transmitter transmitting the response signal transmitted by the tag controller in a form of an RF carrier signal with respect to the carrier wave by using energy of the carrier wave received by the tag receiver.
1 Assignment
0 Petitions
Accused Products
Abstract
A backscattering type radio frequency identification (RFID) communication system, and more particularly, a backscattering type RFID communication system in which an RFID tag transmits a signal back to an RF reader by using energy of a carrier wave transmitted by the RFID reader. Provided is a backscattering type radio frequency identification (RFID) communication system RFID communications are performed efficiently without an error while interference between RFID readers does not occur even under an overcrowded reader environment. Interference of RF signals between the RFID readers does not occur, and RFID communications can be efficiently performed even under the overcrowded reader environment. Transmitting and receiving time steps of the RFID readers do not need to be synchronized with one another so that compatibility of the RFID readers can be improved.
-
Citations
17 Claims
-
1. A backscattering type radio frequency identification (RFID) communication system comprising:
a plurality of RFID readers, each of the plurality of RFID readers comprising; a reader controller generating a query signal to be transmitted to an RFID tag; a visible ray transmitting unit transmitting the query signal transmitted by the reader controller in a form of visible rays; a reader transmitter transmitting a carrier wave in a form of RF by selecting one from among a plurality of frequency channels; and a reader receiver receiving a response signal in a form of RF transmitted from the RFID tag and transmitting the response signal to the reader controller; and a plurality of RFID tags, each of the plurality of RFID tags comprising; a visible ray receiving unit receiving the query signal transmitted by the visible ray transmitting unit of the RFID reader and converting the query signal into an electrical signal; a tag receiver receiving the carrier wave transmitted by the reader transmitter of the RFID reader; a tag controller processing a command of the query signal received by the visible ray receiving unit and generating a response signal with respect to the query signal; and a tag transmitter transmitting the response signal transmitted by the tag controller in a form of an RF carrier signal with respect to the carrier wave by using energy of the carrier wave received by the tag receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
Specification