Anti-Collision Technique of SAW Tags Using Walsh Code

Abstract:

—In view of the inefficiency of coding, the complexity of signal extraction and the strict demands of machining in the existing multiple SAW tags system, an anti-collision technique based on Walsh Code was proposed. First, it encodes the 2PSK using the single antenna transmission structure, then it implements the orthogonal encoding of each tag in a multiple SAW tags system using Walsh coding, and finally the encoding information of each tag is acquired by reading the echo signals from the reader and doing cross-correlation operation with each code block in the orthogonal code-set. The proposed approach incorporates both the coding efficiency and the processing technology, simplifies the complexity of signal extraction, and achieves the goal of anti-collision of multiple SAW tags system. The theoretical analysis and simulation verify the feasibility of this technique.

• Periodical: Applied Mechanics and Materials (Volume 615)
• Pages: 222-228
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.615.222
• Online since: August 2014
• Authors: Shuai Kang*, Jue Long Li, Jian Chun Xing, Li Qiang Xie, Xiao Bo Wang
• Keywords: Anti-Collision, Microelectronics, RFID, SAW, Tags

References

[1] Qing Liu, Weixin Zhang and Zhenxiang Li. Research on the key technology of radio frequency identification and the Internet of things [J]. Electronic Test, 2013, 18: 033.

[2] Binder A, Bruckner G, Bardong J. Passive SAW Based RFID Systems Finding Their Way to Harsh Environment Applications[C]/SENSORCOMM 2013, The Seventh International Conference on Sensor Technologies and Applications. 2013: 57-62.

[3] Plessky V P, Reindl L M. Review on SAW RFID tags[J]. Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on, 2010, 57(3): 654-668.

DOI: 10.1109/tuffc.2010.1462

[4] Saldanha N, Malocha D C, Youngquist R C. Coherence multiplexed passive wireless SAW RFID tag system[C]/Wireless Sensors and Sensor Networks (WiSNet), 2013 IEEE Topical Conference on. IEEE, 2013: 4-6.

DOI: 10.1109/wisnet.2013.6488615

[5] Barton R J. Some Fundamental Limits on SAW RFID Tag Information Capacity and Collision Resolution[J]. (2013).

DOI: 10.1109/wisee.2013.6737552

[6] Hartmann C, Hartmann P, et al. Anti-collision methods for global SAW RFID tag systems[C]/Ultrasonics Symposium, 2004 IEEE. IEEE, 2004, 2: 805-808.

DOI: 10.1109/ultsym.2004.1417859

[7] Puccio D, Malocha D C, Gallagher D, et al. SAW sensors using orthogonal frequency coding[C]/Frequency Control Symposium and Exposition, 2004. Proceedings of the 2004 IEEE International. IEEE, 2004: 307-310.

DOI: 10.1109/freq.2004.1418470

[8] Gallagher M, Malocha D. Mixed orthogonal frequency coded SAW RFID tags[J]. IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 2013, 60(3): 596-602.

DOI: 10.1109/tuffc.2013.2601

[9] Guifu Deng. The research on the coding methods based on SAW frequency identification [D]. Chengdu, University of Electronic Science and Technology of China, (2009).

[10] Siwei Li, Huiping Chen. Walsh Code SS Communication Based on Broadband Signal [J]. Communication Technology, 2000(2)：75-79.

[11] Houjin Chen, JianXue. Signal and System [M]. Tsinghua University Press Co. Ltd., (2003).