Open AccessDesign of Reader Baseband Receiver Structure for Demodulating Backscattered Tag Signal in a Passive RFID Environment
Author(s) -
Bae JiHoon,
Choi WonKyu,
Park ChanWon,
Pyo CheolSig,
Kim KyungTae
Publication year - 2012
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.12.0111.0365
Subject(s) - baseband , demodulation , subcarrier , frequency offset , electronic engineering , offset (computer science) , computer science , signal (programming language) , dc bias , engineering , electrical engineering , telecommunications , bandwidth (computing) , orthogonal frequency division multiplexing , channel (broadcasting) , programming language , voltage
In this paper, we present a demodulation structure suitable for a reader baseband receiver in a passive radio frequency identification (RFID) environment. In a passive RFID configuration, an undesirable DC‐offset phenomenon may appear in the baseband of the reader receiver, which can severely degrade the performance of the extraction of valid information from the received tag signal. To eliminate this DC‐offset phenomenon, the primary feature of the proposed demodulation structures for the received FM0 and Miller subcarrier signals is to reconstruct the signal corrupted by the DC‐offset phenomenon by creating peak signals from the corrupted signal. It is shown that the proposed method can successfully detect valid data, even when the received baseband signal is distorted by the DC‐offset phenomenon.