• The Transactions of The Korean Institute of Electrical Engineers
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• v.63 no.1
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• pp.85-91
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• 2014

As RFID is utilized more frequently and diversely in terms of its application areas, the application of mobile RFID technology, which integrates cellular networks and RFID, is highly anticipated. The growth and development of the RFID field has bolstered the development of mobile RFID chips to be embedded in mobile phones. Because mobile RFID chips are embedded in cell phones, limitations such as low power, small form factor, and costliness must be confronted. This study presents the design of a RFID digital baseband processor that is suitable for mobile readers. The RF analog component, which affects the baseband signals, is designed separately, in consideration of the limitations stated above. The function of the baseband processor was verified through simulations and prototyped using FPGA. The power consumption of the chip is 20mW under a 20MHz clock and the chip measures $3mm{\times}3mm$.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.55 no.12
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• pp.526-533
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• 2006

In this paper, we presented the synchronization module between RF shower system and RFID Reader to extend interrogating range on Mobile RFID system, Costas Loop and FPLL(Frequency/phase Lock Loop) were used. We achieved compromised range of 3MHz locking frequency, 1ms locking time and figured out remarkable Hopping frequency of the Reader. The prototype of the new designed RFID system has been tested with ISO18000-6 type-B Tag. The read range between designed RFID Reader and Tag has been measured, it increased triple times by adjusting the Shower system output level.

• ETRI Journal
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• v.33 no.3
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• pp.382-392
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• 2011

This paper proposes the streaming radio frequency identification (RFID) protocol to support robust data streaming in a passive communication, which is extended from the ISO18000-6 Type C RFID standard. By observing and modeling the unique bit error behavior through detailed analysis in this paper, we found that performance is significantly limited by inaccurate and unstable link frequencies as well as low SNR which are inevitable for passive devices. Based on the analysis, we propose a simple and efficient protocol to adaptively insert extra error control sequences in a packet for tolerating tough link condition while maximizing the throughput and preserving the minimal implementation cost. To evaluate effectiveness of our proposal in real-time streaming applications, we experimented on real-time H.264 video streaming and prototyped the system on FPGA. To our best knowledge, our paper is the first work to take analytical approach for maximizing the throughput and demonstrate the possibility of the realtime multimedia streaming transmission in the passive RFID system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.542-545
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• 2006

In recent years, RFID is widely used in Industrial applications including factory, material flow, logistics and defense areas. In this paper, we developed a RFID baseband system with ASK modulation and convolutional channel code. A commercial ASK RF module is used and its frequency range in $350\sim351MHz$ and power is 10mW and the convolution code is constraint length k=3 and rate R=1/2. The performance is measured by frame error rate and the convolutional code is very useful in performance improvement and, also we implemented the binary search algorithm as anti-collision method and we show the wave shapes whit collision occurrence. This RFID system is designed by FPGA therefore it produces result of speed-up and improvement of reliability.