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[文学研究]专题 RFID 的识别、轮询与估算 机制
专题1 :RFID的识别、轮询与估算
机制
谢磊 博士
南京大学计算机科学与技术系
主要内容:
一、RFID的基本通信原理
二、基于时隙ALOHA的标签识别机制
(Identification )
三、RFID标签轮询机制(Polling )
四、RFID标签估算机制(Estimation )
五、开放性问题(Open Problem )
六、参考文献
RFID的基本通信原理-1
• Far-Field Propagation and Backscatter Principle
RFID的基本通信原理-2
• Far-Field Propagation and Backscatter Principle
– We denote the down-link communication from the reader to a tag as the
forward channel , and denote the up-link communication from a tag to
the reader as the reverse channel.
– For successful reading of a passive tag with the backscatter scheme,
there are two thresholds to meet the physical requirements. The first is
the tag power (sensitivity) threshold, Pts . It is the minimum received
power necessary to turn on an RFID chip. The second is the reader
sensitivity threshold, Prs . It is the minimum level of the tag signal that
the reader can detect and resolve.
– Thus it must satisfy P2 Pts for the tag to be powered up and resolve
the received signal, and also P4 Prs for the reader to detect and
resolve the received signal.
基于时隙ALOHA的标签识别机制-1
• Tag inventory and access
基于时隙ALOHA的标签识别机制-2
• Tag inventory and access
– The MAC protocol for the C1G2 system is based on Slotted ALOHA,
where each frame has a number of slots and each active tag will reply
in a randomly selected slot per frame.
– When a reader (interrogator) wishes to read a set of tags, it first powers
up and transmits a continuous wave (CW) to energize the tags. It then
initiates a series of frames, varying the number of slots in each frame to
best accommodate the number of tags. After all tags are read, the reader
powers down. We refer to an individual frame as a Query Round, and
the series of Query Rounds be
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