(From Leong, K.S., M.L. Ng, and P.H. Cole. 2006a.
Synchronization of RFID readers for dense RFID reader
environments. International Symposium on Applications
and the Internet. SAINT, Phoenix, Arizona, USA, #
2006 by IEEE. With permission; Leong, K.S., M.L. Ng,
A. Grasso, and P.H. Cole. 2006d. J. Commun., 1, 9,
# 2006 by IEEE. With permission.)
Truck docks
h
Antenna
A
Antenna
B
Best
read
zone
Moderate read zone
FIGURE 7.6
Alternating of ??????Listening??™??™ and ??????Talking??™??™
mode. (From Leong, K.S., M.L. Ng, and
P.H. Cole. 2006a. Synchronization of RFID
readers for dense RFID reader environments.
International Symposium on Applications
and the Internet. SAINT, Phoenix,
Arizona, USA, # 2006 by IEEE. With permission;
Leong, K.S., M.L. Ng, A. Grasso,
and P.H. Cole. 2006d. J. Commun., 1, 9,
#2006 by IEEE. With permission.)
2 8 4 10 6 2 8 4 10 6 2 8
Channel
Time
"Listening"
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132 RFID Handbook: Applications, Technology, Security, and Privacy
possible. As illustrated in Figure 7.7, the spectrum is split into 10 channels, all 5 of the
odd-numbered channels are reserved for tag backscattering, whereas all 5 of the evennumbered
channels are assigned for reader interrogation. Figure 7.6 shows how the channel
assignment is done. The antenna on the furthest left is using channel 2 for interrogation.
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