Adaptive line code selection by identification efficiency for RFID systems

RFID passive tags transmit their information by reflecting a reader's continuous wave. The strength of the reflected signal by a tag is very weak. So the signal of tags may be easily corrupted by noise or interference. In EPCglobal Class1 Generation2, four types of line codes are presented to adapt to varying channel conditions. However what type of line code is used is not specified in the EPCglobal Class1 Generation2 specification. In this paper, we propose a new line code selection algorithm which estimates the efficiency of the line codes reflecting the channel status and adaptively changes the line code at each frame. We show that the identification performance is enhanced by using our line code selection algorithm via analysis and simulation.

[1]  Sung Ho Cho,et al.  Performance Evaluation of RFID EPC Gen2 Anti-collision Algorithm in AWGN Environment , 2007, 2007 International Conference on Mechatronics and Automation.

[2]  Jun-Seok Park,et al.  Effects of reader interference on the RFID interrogation range , 2007, 2007 European Microwave Conference.

[3]  Tae-Jin Lee,et al.  Channel-Aware Line Code Decision in RFID , 2011, IEEE Communications Letters.

[4]  Yeong Rak Seong,et al.  A channel allocation scheme considering with collisions and interferences in practical UHF RFID applied communication fields , 2008, 2008 IEEE International Conference on RFID.

[5]  Dariush Divsalar,et al.  Some interesting observations for certain line codes with application to RFID , 2006, IEEE Transactions on Communications.

[6]  Murali S. Kodialam,et al.  Fast and reliable estimation schemes in RFID systems , 2006, MobiCom '06.

[7]  F. De Flaviis,et al.  RF Identification (RFID) Reader Front Ends With Active Blocker Rejection , 2009, IEEE Transactions on Microwave Theory and Techniques.

[8]  Roy Want,et al.  An introduction to RFID technology , 2006, IEEE Pervasive Computing.

[9]  P.V. Nikitin,et al.  Theory and measurement of backscattering from RFID tags , 2006, IEEE Antennas and Propagation Magazine.

[10]  KyungHi Chang,et al.  Radio Transmission Performance of EPCglobal Gen-2 RFID System , 2008, 2008 10th International Conference on Advanced Communication Technology.