• Proceedings of the Korea Multimedia Society Conference
• /
• 2004.05a
• /
• pp.425-428
• /
• 2004

최근 각광을 받고 있는 RFID는 재고와 제조 유통분야를 중심으로 발전해 오던 바코드를 대체하여 물류유통의 혁명을 초래할 기술로 주목 받고 있다. 그러나 국내의 RFID에 대한 기술 및 자본의 투자는 해외에 비해 미흡한 실정이다. RFID 시스템에서 하나의 인터러게이터 영역에 다수의 트랜스 폰더가 동시에 데이터를 전송하게 되어 데이터 충돌이 발생하게 된다. 본 논문에서는 인터러게이터에서 각 트랜스폰더의 상호 충돌로부터 신뢰성 있게 데이터를 보호하고 해독이 가능하도록 하는 여러 충돌 방지 시스템에 대해서 알아본다.

• ETRI Journal
• /
• v.26 no.6
• /
• pp.560-564
• /
• 2004

An analog front-end circuit for ISO/IEC 14443-compatible radio frequency identification (RFID) interrogators was designed and fabricated by using a $0.25{\mu}m$ double-poly CMOS process. The fabricated chip was operated using a 3.3 Volt single-voltage supply. The results of this work could be provided as reusable IPs in the form of hard or firm IPs for designing single-chip ISO/IEC 14443-compatible RFID interrogators.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2008.05a
• /
• pp.253-259
• /
• 2008

RFID is a generic term for technologies which use RF waves to identify, track, or categorize any object. A radio frequency identification (RFID) reader recognizes objects through wireless communications with RFID tags. Tag collision arbitration for passive tags is a significant issue for fast tag identification due to communication over a shared wireless channel. One of the research areas in RFID system is a tag anti-collision protocol. In this paper, various anti-collision protocols are discussed. The pros and cons of different anti-collision protocols are compared with each other and their performance is analyzed and the better performance anti-collision protocol is suggested.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2004.05a
• /
• pp.1343-1346
• /
• 2004

RFID(Radio Frequency Identification) 시스템은 최근 다양한 분야로의 적용이 기대되면서, 개발이 급증하고있다. RFID 시스템은 물류관리, 보안, 유비쿼터스 등 많은 분야에서 시스템의 중추적인 기술로 사용된다. RFID 시스템을 구성하는 인터로게이터(Interrogator)와 태그(Tag)의 개발이 빠르게 진행 중에 있다. 본 논고에서는 ISO/IEC 18000-6 Type B를 만족하는 UHF 대역의 RFID 태그를 VHDL를 사용하여 설계하고 구현하였다.

• Aerospace Engineering and Technology
• /
• v.7 no.1
• /
• pp.236-244
• /
• 2008

The evolution and application of RFID technologies have been at the forefront of allowing aviation industries to improve the quality of aircraft maintenance and air cargo handling. However, safety problems in airplane operation are arising from the hazards of frequencies transmitted due to RFID systems. Though the intensities of frequencies back-scattered from the tags are very weak, some malfunctions are anticipated due to induction coupling on aircraft wiring. Therefore, safety assessment such as electromagnetic compatability should be accomplished upon aircraft critical and essential equipments before installations.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.32 no.1A
• /
• pp.83-90
• /
• 2007

In this paper, we propose an implementation and an algorithm of 'Jitter and Glitch Removing Circuit' for UHF RFID reader system based on ISO/IEC 18000-6C standard. We analyze the response of TI(Texas Instrument) Gen2 tag with a reader using the proposed algorithm. In ISO/IEC 18000-6C standard, a bit rate accuracy(tolerance) is up to +/-22% during tag-to-interrogator communication and +/-1% during interrogator-to-tag communication. In order to solve tolerance problems, we implement the Jitter and Glitch Removing Circuit using the concept of tolerance and tolerance-accumulation instead of PLL(DPLL, ADPLL). The main clock is 19.2MHz and the LF(Link Frequency) is determined as 40kHz to meet the local radio regulation in korea. As a result of simulations, the error-rate is zero within 15% tolerance of tag responses. And in the case of using the adaptive LF generation circuit, the error-rate varies from 0.000589 to zero between 15% and 22% tolerance of tag responses. In conclusion, the error-rate is zero between 0%-22% tolerance of tag response specified in ISO/IEC 18000-6C standard.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.53 no.9
• /
• pp.67-74
• /
• 2016

This paper presents a novel multiple orthogonal subcarrier modulation based UHF band RFID communication system. In tag-to-reader communication, the demonstration system can deliver 1.6 Mbps through four subcarriers. To improve data rate while suppressing increase in circuit complexity, tag employs square-waves as the subcarriers and uses individual load modulators for each subcarrier. By using multiple orthogonal subcarrier based modulation, proposed communication system can be operated under existing UHF band RFID regulation. In reader, an OFDM demodulator is used. Since the tag backscatters the reader's CW carrier, carrier frequency offset compensation is not necessary in reader demodulator. Experimental results show that the demonstration system achieves a bit error rate of 10-5 at an Eb/N0 of 10.8 dB.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.24 no.7B
• /
• pp.1342-1350
• /
• 1999

In this paper, we have developed and analyzed the 2.45GHz microwave RFID system. Which is composed tag and interrogator using custom IC, and we have made the software driving the hardware for the bidirectional data transmission method. Using 3.6V power supply was used, the optimal identification range in the information transmission of the designed microwave RFID system operating at 9,600bps was l0m. In the control circuit of the tag, the low current consumption of 15$mutextrm{A}$ and the tag data transmission rate of 90% when the moving velocity was 80km/h.

• ETRI Journal
• /
• v.29 no.6
• /
• pp.755-768
• /
• 2007

A very promising application of active RFID systems is the electronic seal, an electronic device to guarantee the authenticity and integrity of freight containers. To provide freight containers with a high level of tamper resistance, the security of electronic seals must be ensured. In this paper, we present the design and implementation of an electronic seal protection system. First, we propose the eSeal Protection Protocol (ePP). Next, we implement and evaluate various cryptographic primitives as building blocks for our protocol. Our experimental results show that AES-CBC-MAC achieves the best performance among various schemes for message authentication and session key derivation. Finally, we implement a new electronic seal system equipped with ePP, and evaluate its performance using a real-world platform. Our evaluation shows that ePP guarantees a sufficient performance over an ARM9-based interrogator.