Patent ID: 8598987

Claim:
A radio frequency identification (RFID) system, comprising: a plurality of RFID tags configured to store a plurality of spread spectrum data that are previously generated by spreading a plurality of original data with a plurality of orthogonal codes; and a RFID reader configured to transmit a data request command to the plurality of RFID tags by designating at least one RFID tag of the plurality of RFID tags, and simultaneously extract at least one of the plurality of original data respectively corresponding to the at least one RFID tags from at least one of the plurality of spread spectrum data transmitted from the at least one RFID tag, when receiving spread spectrum data from more than one RFID tag simultaneously, wherein, if the data request command indicates that two or more RFID tags of the plurality of RFID tags are designated, the two or more RFID tags transmit spread spectrum data stored in the two or more RFID tags to the RFID reader, and wherein, if the data request command indicates that one RFID tag of the plurality of RFID tags is designated, the one RFID tag extracts original data from spread spectrum data stored in the one RFID tag, and transmits the original data to the RFID reader.