CDMA-based RFID Systems in Dense Scenarios: Concepts and Challenges

Radiofrequency identification (RFID) applications with large tag populations often require the fast identification of the tags present. Conventional RFID systems using framed ALOHA based medium access control algorithms waste bandwidth during the singulation process when tag replies collide on the shared wireless channel. In this paper, we investigate how code division multiplexing techniques can be used to decode tag replies in such collisions. Our analysis focusses on the choice of code set and detector for use in a spread spectrum RFID system. The paper also presents a method to estimate the number of tags in the range of such a spread spectrum RFID system.

[1]  C. Dehollain,et al.  Remotely powered addressable UHF RFID integrated system , 2005, IEEE Journal of Solid-State Circuits.

[2]  Xu Huang,et al.  Efficient Dynamic Framed Slotted ALOHA for RFID Passive Tags , 2007, The 9th International Conference on Advanced Communication Technology.

[3]  Harald Vogt,et al.  Efficient Object Identification with Passive RFID Tags , 2002, Pervasive.

[4]  Armin Wittneben,et al.  Robust signal detection in passive RFID systems , 2007 .

[5]  M. Kossel.  Active microwave tagging systems , 2000 .

[6]  Aylin Yener,et al.  ASAP : A MAC Protocol for Dense and Time Constrained RFID Systems , 2006, ICC.

[7]  A.A.M. Saleh,et al.  The near/far effect in local ALOHA radio communications , 1987, IEEE Transactions on Vehicular Technology.

[8]  Jae-Hyun Kim,et al.  Dynamic framed slotted ALOHA algorithms using fast tag estimation method for RFID system , 2006, CCNC 2006. 2006 3rd IEEE Consumer Communications and Networking Conference, 2006..

[9]  Vincent M. Stanford,et al.  Pervasive Computing Goes the Last 100 Feet with RFID Systems , 2003, IEEE Pervasive Comput..

[10]  John G. Proakis,et al.  Digital Communications , 1983 .

[11]  F. Schoute,et al.  Dynamic Frame Length ALOHA , 1983, IEEE Trans. Commun..

[12]  D. R. Hush,et al.  Analysis of tree algorithms for RFID arbitration , 1998, Proceedings. 1998 IEEE International Symposium on Information Theory (Cat. No.98CH36252).

[13]  C. Floerkemeier.  Bayesian Transmission Strategy for Framed ALOHA Based RFID Protocols , 2007, 2007 IEEE International Conference on RFID.

[14]  Yinan Zhang,et al.  A Novel Transmission Control Algorithm for Framed-ALOHA Schemes in Dense RFID Networks , 2007, 2007 IEEE 66th Vehicular Technology Conference.

[15]  Jaideep Srivastava,et al.  Adaptive binary splitting for efficient RFID tag anti-collision , 2006, IEEE Communications Letters.