Abstract:
Ein Modulationsverfahren mittels erweiterter Pulsintervallcodierung (PIE) in einem System zur Identifikation mit Hilfe elektromagnetischer Wellen (RFID), wobei das Verfahren übertragene 2-Bit-Daten moduliert und umfasst: Einstellen einer Länge eines Symbols gemäß einem Wert des ersten Bits der übertragenen Daten; und Einstellen einer Länge eines Energieübertragungswarteabschnitts gemäß einem Wert des zweiten Bits der übertragenen Daten.
Abstract:
PURPOSE: An RFID tag having an automatic frequency controlling function is provided to stably supply performance of an RFID tag by automatically controlling a frequency though a signal of an RFID reader. CONSTITUTION: A frequency generating unit(240) generates a frequency and changes the size of the generated frequency according to a control signal. A frequency estimator presumes whether there is the generated frequency within a reference signal which is transmitted from an RFID reader. A comparator compares the reference value with the number of obtained clocks.
Abstract:
PURPOSE: A master RFID tag for the administration of physical distribution and a method thereof are provided to enable users to confirm the robbery of products in the middle of circulation steps. CONSTITUTION: A tag reader unit(300) reads information of RFID(Radio Frequency Identification) tag attached to each product stored in a deposit box. A tag information storage unit(310) store the RFID tag information read by the RFID tag. A control unit(330) wirelessly transmits the RFID tag information stored in the tag storage unit to an external RFID reader unit. The tag reader unit is activated by an activation command. The control unit compares the read RFID tag information with the stored RFID tag information.
Abstract:
A synchronization method between a reader and a tag are provided to accurately perform the synchronization between a reader and a tag based on the calculation of both clock offset and message delay between the reader and the tag. A reader transmits a first write instruction message to a tag at first time(111), and the tag detects the first write instruction message from the reader at a second time. The tag transmits a first response message corresponding to the first write instruction message to the reader(112), and the reader the second write instruction message including time information for the first time to the tag(113). The tag corrects clock offset by using the difference between the first and second times.