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International Journal of Distributed Sensor Networks
Volume 2012 (2012), Article ID 406710, 12 pages
http://dx.doi.org/10.1155/2012/406710
Research Article

A Robust Baseband Demodulator for ISO 18000-6C RFID Reader Systems

Department of Electronics and Computer Engineering, Hanyang University, Seoul 133-791, Republic of Korea

Received 25 April 2012; Accepted 23 July 2012

Academic Editor: Minglu Li

Copyright © 2012 Cheng Jin and Sung Ho Cho. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

One key challenge for ultra-high frequency (UHF) radio-frequency identification (RFID) reader design is to demodulate the weak tag response signal which tends to be easily distorted and has considerable frequency deviations. In this paper, a baseband demodulator based on a matched filter (MF) is proposed to enhance the reliability of signal processing for the EPCglobal Class-1 Generation-2 (Gen2) RFID reader systems. The proposed demodulator is very robust against strong signal distortions and large frequency deviations happening on the received backscattered signal from a passive RFID tag. The validity and usefulness is demonstrated by both computer simulations and implementation experiments.