A Passive UHF RFID System with Huffman Sequence Spreading Backscatter Signals

At present passive RFID standards, the tag collision problems are solved using time division multiple access technologies, including slotted ALOHA schemes and binary-tree search schemes. In order to accelerate an inventory process, a multiple access scheme that can identify more than one tag simultaneously is necessary. Considering the characteristics of a passive UHF RFID system, a novel passive tag backscatter scheme using Huffman spreading sequences is proposed, which can effectively improve an inventory process. The performances of several studied multiple access schemes are compared. Simulation results validate the performance enhancement of the proposed system.

[1]  Yoshihiro Tanada.  Orthogonal Set of Huffman Sequences and Its Application to Suppressed-Interference Quasi-Synchronous CDMA System , 2006, IEICE Trans. Fundam. Electron. Commun. Comput. Sci..

[2]  G.D. Durgin,et al.  Implementation of an Anti-Collision Differential-Offset Spread Spectrum RFID System , 2006, 2006 IEEE Antennas and Propagation Society International Symposium.

[3]  Y. Tanada.  Synthesis of a set of real-valued shift-orthogonal finite-length PN sequences , 1996, Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications.

[4]  D. van der Weide,et al.  Radar Cross-Section Analysis of Backscattering RFID Tags , 2007, IEEE Antennas and Wireless Propagation Letters.

[5]  Anil Rohatgi.  Implementation and Applications of an Anti-Collision Differential-Offset Spread Spectrum RFID System , 2006 .

[6]  David A. Huffman,et al.  The generation of impulse-equivalent pulse trains , 1962, IRE Trans. Inf. Theory.

[7]  Vijay Pillai,et al.  A technique for simultaneous multiple tag identification , 2005, Fourth IEEE Workshop on Automatic Identification Advanced Technologies (AutoID'05).