• Title/Summary/Keyword: Reader Recognition

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Development of High-Speed RFID Reader System (고속 RFID Reader 시스템 개발)

  • Shin, Jae-Ho;Hong, Yeon-Chan
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.9
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    • pp.915-919
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    • 2007
  • This paper proposed a transponder detection method to reduce recognition time in RFID system. It's also shown that conventional procedure of communication in the system could cause a waste of time when a reader recognizes a transponder. The reduction of recognition time can be obtained by developing a circuit to detect a transponder actively. Detecting a transponder is achieved by using the voltage variation of reader antenna voltage that happens when a transponder approaches to the vicinity of magnetic field formed by the reader. By adding a comparator to the antenna receiver of a reader, the reader can perceive approach or existence of a transponder. A reader for experiment is made using the MFRC500 by Phillips that supports ISO/IEC 14443 protocol. Comparing the proposed method with the conventional methods by experiment, there are 47.5ms reduction of recognition time maximally and 12ms in average.

Analysis of Channel Collision Avoidance Performance of RFID Reader with Compressive Receiver (컴프레시브 수신기가 내장된 RFID 리더의 채널 충돌 회피 성능 분석)

  • Jo, Won-Sang;Park, Dong-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.5
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    • pp.501-509
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    • 2010
  • In this paper, the interference avoidance performance of the RFID reader with the compressive receiver was analyzed. In the environment of the multiple dense readers operating, the recognition rates of the conventional RFID reader and the proposed RFID reader with the compressive receiver were measured and compared. The recognition rate of the proposed reader was improved more than 2.7 times compared to the conventional reader. Especially, in the environment of two proposed RFID readers operating simultaneously, little degradation of the recognition rate was observed.

Implementation of a very small 13.56[MHz] RFID Reader ensuring machine ID recognition in a noise space within 3Cm (3Cm 이내의 잡음 공간 속 기계 ID 인식을 보장하는 초소형 13.56[MHz] RFID Reader의 구현)

  • Park, Seung-Chang;Kim, Dae-Jin
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.43 no.10 s.352
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    • pp.27-34
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    • 2006
  • This paper has implemented a very small($1.4{\times}2.8[Cm^2]$) 13.56[MHz] RFID reader ensuring machine ID recognition correctly in a noise space of Tag-to-Reader within 3Cm. For operation of the RFID system, at first, this paper has designed the loop antenna of a reader and the fading model of back-scattering on microwave propagation following to 13.56[MHz] RFID Air Interface ISO/IEC specification. Secondly, this paper has proposed the automatically path selected RF switching circuit and the firmware operation relationship by measuring and analyzing the very small RFID RF issues. Finally, as a very small reader main body, this paper has shown the DSP board and software functions made for extraction of $1{\sim}2$ machine ID information and error prevention simultaneously with carrying of 13.56[MHz] RFID signals that the international standard specification ISO/IEC 18000-3 defined.

Improving Recognition Time in the RFID Reader Collision Avoidance System (인식시간을 단축한 RFID 리더충돌회피 시스템)

  • Kim, You-Ho;Jang, Young-Soo;Choi, Bong-Suk;Seong, Won-Mo
    • Journal of KIISE:Computing Practices and Letters
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    • v.14 no.9
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    • pp.884-891
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    • 2008
  • As the scale of RFID systems grows, decrease in recognition rate of collision between readers is becoming an issue. Time division technique may solve the problem, but this will cause total recognition time to increase. This issue must be solved for real-time inventory control. In this study, total recognition time was improved by placing ARCM in RFID systems. ARCM maintains short recognition time through efficient utilization of frequency channel and manages RFID systems to recognize the tag by avoiding interference. As the result of using ARCM, saving maximum 20% of time was possible.

Group Separation Anti-collision Algorithm for RFID Tag Recognition (효율적인 RFID 태그의 인식을 위한 Group Separation 충돌 방지 알고리즘 개발)

  • Lee, Hyun-Soo;Ko, Young-Eun;Bang, Sung-Il
    • Proceedings of the IEEK Conference
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    • 2007.07a
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    • pp.29-30
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    • 2007
  • In this paper, we propose Group Separation(GS) algorithm for RFID tag recognition. In GS algorithm, reader calculates tag ID by collision point, stores memory with the collision table. And reader classifies according to total number of tag ID's 1, requests each group. If tag comes into collision with the other tag, reader searches tag ID in collision table. As a result, we observes that transmitted data rate, the recognition time is decreased.

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A Recognition System for Multiple Mobile Robots Using RFID System in Smart Space (스마트 스페이스에서 RFID 시스템을 이용한 다수 이동로봇 인식 시스템)

  • Tak, Myung-Hwan;Yeom, Dong-Hae;Cho, Young-Jo;Joo, Young-Hoon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.11
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    • pp.2103-2107
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    • 2010
  • This paper deals with the recognition of multiple mobile robots equipped with RFID tag. In the case that the number of robots recognized by each RFID reader is larger than that of allocated slots, the clashing recognition occurs. And, in the case that the total number of robots recognized by all RFID reader is larger than that of real robots, the repetitious recognition occurs. We employ the dynamic frame slot allocation by using the ALOHA algorithm to prevent the clashing recognition and estimate the number of robots by using the received signal strength indication to prevent the repetitious recognition. The numerical experiment shows the reliability and the efficiency of the proposed method.

Development of Hybrid RFID Reader to Recognize Pet (애완동물 인식을 위한 하이브리드 RFID 리더 개발)

  • Choi, Seong-Sik;Kim, Mun-Gab;Jung, Bo-Hwan
    • 전자공학회논문지 IE
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    • v.48 no.4
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    • pp.40-46
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    • 2011
  • In this paper, we introduce a hybrid RFID reader to recognize the pets. There is no the RFID reader to recognize a different types of frequency simultaneously. The RFID reader with 134.2 KHz has disadvantages with limited recognition radius and direction. The developed reader is dual-frequency RFID reader (134.2 KHz, 13.56 MHz) that is capable of identifying the pets with a different types of tags. The prototype model in the field test shows that the recognition coverage increases compared to the imported reader.

A Study of RFID System Enable to High Speed Recognition (고속인식이 가능한 무선인식 시스템에 관한 연구)

  • 윤상문;백선기;김윤집;박면규;이기서
    • Proceedings of the KSR Conference
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    • 2002.05a
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    • pp.522-529
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    • 2002
  • In this Paper, it has a proposal of the RFID(RFID : Radio Frequency Identification) system for high-speed recognition between the tag attached a mobile object moving high-speed and the static reader. It used 13.56MHz frequency at ISM band, and designed a reader in order to recognize a mobile object moving high-speed. It will be expected that RFID system enables a smooth railway signal control applying in railway system through the cyclic loop antenna.

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A Reader Anti-Collision Algorithm based on Hierarchical Structure for RFID Systems (RFID 시스템을 위한 계층적 구조 기반의 리더 충돌 방지 알고리즘)

  • Oh, Jung-Suk;Hwang, Jun-Ho;Kang, Yu-Chol;Lee, Jung-Hee;Yoo, Myung-Sik
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.10B
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    • pp.885-893
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    • 2008
  • In RFID system, reader collision happened when multiple readers try to read the tags at the same time. Because reader collision reduces tag recognition performance, it is required for RFID system to have reader anti-collision algorithm. In this paper, we propose reader anti-collision algorithm based on hierarchical structure, where a master reader controls the slave readers to avoid the reader collisions. It is verified through simulations that the proposed algorithm enhances the performance in terms of leader collision probability and tag reading time.

Change of Recognition Range According to Modulation Index of the 13.56MHz RFID Type B System (13.56MHz RFID Type B 시스템에서 변조지수에 따른 인식거리의 변화)

  • Kim, Yong-Hee;Yang, Woon-Geun;Yoo, Hong-Jun
    • Proceedings of the IEEK Conference
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    • 2005.11a
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    • pp.119-122
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    • 2005
  • In this paper, we investigated the recognition range according to modulation index for the ISO(International Standards Organization) 14443 13.56MHz contactless Type B RFID(Radio Frequency IDentification) system. We measured recognition range with changing modulation index step by step from 5% to 24% where we used 4 samples of Type B transponder with different resonance frequencies between 13.838MHz and 17.200MHz. While gradually increasing a distance in vertical direction from the center of the reader antenna, we measured the distance where the transponder's PUPI(Pseudo Unique PICC(Proximity IC Card) Identifier) is recognized continuously during 10 seconds and the distance where the transponder's PUPI is recognized at least two times during 5 seconds. From the measurement results, we found that the best recognition ranges were achieved when the reader had modulation index between 11% and 14%.

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