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

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.

Simple Low Cost Open Source UHF RFID Reader

“…As for data recovery, this operation is done on the fly directly in the interrupt handler (see Fig. 5, lines [15][16]. Final decoded sequence is presented in Table I line 3 and on top of the data slicer curve in Fig.…”