Abstract:
본 발명은 충돌 타입의 식별 기능을 갖는 RFID 리더 및 그 제어방법에 관한 것으로, RF 통신부에 수신된 신호의 데이터를 분석하여 수신신호의 충돌발생 여부를 확인하고, 해당 RFID 리더와 다른 RFID 리더 또는 태그 중 충돌 발생 수단에 따른 충돌 타입을 진단하여 대응하는 충돌 해결 동작을 수행하도록 한다. 본 발명에 따르면, RFID 리더와 태그 사이에서 발생되는 모든 타입의 충돌에 대한 식별이 가능하므로, 충돌 발생 원인을 빠르게 인지할 수 있어 충돌 발생 원인에 대처할 수 있게 된다. 또한, RFID 리더를 구비한 모바일 어플리케이션에서 충돌이 감지된 경우, 해당 충돌 타입에 대응하는 충돌 제어를 처리함으로써, 이미 시작된 인벤토리 라운드(inventory round)를 성공적으로 종료할 수 있는 이점이 있다.
Abstract:
본 발명은 다량의 태그를 보다 신속하게 인식할 수 있도록 하는 수동형 RFID 시스템 및 방법에 관한 것으로, 상기 리더는 슬롯 명령어와 슬립 명령어를 동시에 생성하여 충돌 및 간섭이 발생하지 않는 서브채널을 파악함과 동시에 이전 슬롯에서 충돌 및 간섭이 발생하지 않는 서브채널을 사용한 태그는 슬립 상태로 진입되도록 하는 프로세서; 상기 슬롯 명령어와 슬립 명령어를 동시에 인코딩 및 크기지터 변조하여 송출하는 송신부; 및 슬롯별로, 다중 서브채널로 수신되는 태그신호를 복조하여 상기 프로세서에 제공하는 수신부를 포함할 수 있다.
Abstract:
PURPOSE: A passive RFID system and method are provided to transmit a tag signal with one slot and a frequency band. CONSTITUTION: A processor(110) transits a sub channel in which collision and interference does not generate to a sleep status. A transmitting unit(120) performs the encoding of a command generated in the processor and size jitter modulation. In order that the processor grasps the sub channel by slot in which collision and interference does not generate, a receiving unit(130) performs the acquisition and demodulation of a tag signal by slot received through a plurality of sub channels. The receiving unit offers the processed tag signal to the processor.
Abstract:
PURPOSE: A synchronization apparatus for precisely decoding the reception signal within a phase jitter modulation tag and a tag including the same are provided to determine the decoding starting point of payload data by using a MFM(Modified Frequency Modulation) flag and a correlator. CONSTITUTION: A plurality of correlators(120, 150, 170) implements a correlation calculation for a reception signal which is phase jitter modulated with a template of an internal match filter having the same shape with a part of the frequency modulation flag. An optimal signal selector(100) divides the signal received through a single path into various paths.
Abstract:
A channel zone production method and a tag identifying method for using a channel zone in a radio frequency identifying for forming a channel zone sharing the channel selected by an arbitration reader are provided to improve the recognition rate of the RFID tag by identifying the tag through a plurality of the channel zone. One of a plurality of channels is selected by a reader(S101). The reader determines the presence of a channel zone sharing the selected channel according to predetermined sync signal(S103). In case the channel zone exists, it determines the reader is in the channel zone(S107). In case it is classified into the channel zone, the channel zone is formed with the arbitration reader for the channel zone(S109).
Abstract:
본 발명은 밀집 리더 환경에서 리더 매체 접근 방법 및 그 방법을 적용하는 리더를 개시한다. 본 발명에 따른 리더 매체 접근 방법은 리더와 태그 사이의 에어 타임을 시간 슬롯으로 나누고 각 슬롯에서 LBT 방식으로 동작하고 여러 개의 슬롯은 다시 프레임을 구성하는 것을 특징으로 한다. 따라서 다수 개 리더 간의 채널 스케줄링을 통하여 리더를 제어하고 효율적으로 태그를 식별할 수 있다. RFID, 밀집리더, 매체 접근, 동기화, RSSI 패턴
Abstract:
An RFID(Radio Frequency IDentification) device integrating an RFID reader and an RFID tag is provided to offer a function of the RFID tag and the RFID reader flexibly according to a use purpose by supporting the tag and reader functions at the same time, as the RFID tag and the RFID reader are integrated in one device. A back-scatter RFID tag analog unit(10) multiplexes/outputs tag data in a back-scatter mode and demultiplexes a command received from an RFID reader. An RFID reader analog unit(20) multiplexes/outputs the command to the RFID tag and demultiplexes the received tag data to be operated as the RFID reader. An SPDT(Single Pole Double Throw) switch(40) connects the back-scatter RFID tag analog unit or the RFID reader analog unit to an antenna based on a switch control signal received from an RFID reader/tag integrated digital unit(30). The RFID reader/tag integrated digital unit outputs the switch control signal to the switch according to a request for operating a tag mode, activates the back-scatter RFID tag analog unit, reads the tag data by receiving the command from the RFID reader through the back-scatter RFID tag analog unit, and transfers the read tag data to the back-scatter RFID tag analog unit.
Abstract:
A reader/tag integrated RFID(Radio Frequency IDentification) device and a method thereof are provided to reduce a system size and increase portability by performing a reader and tag function without inter-collision. A tag unit(103) transmits a response signal and data responding to a signal received from an external reader by communicating with the external reader. A reader unit(105) communicates with an external tag by using a random value, which is selected to minimize the inter-collision by selecting a channel with a different delay time between other reader and the reader/tag integrated RFID device. A controller(101) activates the reader or tag unit selectively, and controls the activated unit. The reader unit includes a random value generator(233) generating the random value for selecting the channel with the delay time different from other readers, a collision arbiter(238), a reader transmitter(234) generating/transmitting a reader command message determined by the collision arbiter, a reader receiver(235), and a channel operation controller.
Abstract:
An RFID(Radio Frequency Identification) reader for preventing a leaking transmission signal is provided to limit power of an RF receiving signal to less than circuit sensitivity of a receiver side if a portion of an RF transmission signal is incoming to the RF receiving signal, thereby preventing a receiver from being saturated by the leaking transmission signal. A limiter circuit(200) is installed between a circulator(130) and a band pass filter(140) in order to prevent a receiver(150) from being saturated or destroyed by a leaking transmission signal generated by an RF transmission signal, and limits power of an RF receiving signal applied from the circulator(130). The limiter circuit(200) consists of a diode which is a nonlinear element.