Development of Long-Range RFID Reader System supporting Sensor Tag 


Vol. 34,  No. 6, pp. 626-633, Jun.  2009


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  Abstract

ISO/IEC/WD 24753 defines new modem specifications for a long-range RFID communications and application protocol for a sensor tag system. According to the standard, the frequency offset of the tag is 4%. In general wireless communications systems, it is known that a coherent receiver is superior to a non-coherent receiver. However, if the frequency offset is large, it is difficult to restore the original data accurately with a coherent receiver, and the performance of a coherent receiver is easily degraded. In this paper, a non-coherent receiver structure is adopted to solve the frequency offset problem of long-range RFID communications. We designed a frequency estimation block to find an optimal frequency from the received signal with 4% frequency offset and proposed a start frame delimiter (SFD) detection algorithm to determine the start position of the payload. The frequency estimation block finds the optimal frequency from the received signal using 9-correlators. And the SFD detection block searches the received signal to find the start position of the payload with dual correlator. We implemented a long-range RFID reader with the proposed methods and evaluated its performance in a wired/wireless test network. The implemented long-range RFID reader showed more superior performance than the commercial RFID reader in terms of recognition range.

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  Cite this article

[IEEE Style]

D. Shin and D. Kim, "Development of Long-Range RFID Reader System supporting Sensor Tag," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 6, pp. 626-633, 2009. DOI: .

[ACM Style]

Dong-Beom Shin and Dae-Young Kim. 2009. Development of Long-Range RFID Reader System supporting Sensor Tag. The Journal of Korean Institute of Communications and Information Sciences, 34, 6, (2009), 626-633. DOI: .

[KICS Style]

Dong-Beom Shin and Dae-Young Kim, "Development of Long-Range RFID Reader System supporting Sensor Tag," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 6, pp. 626-633, 6. 2009.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880