[文学研究]专题 RFID 的识别、轮询与估算 机制.pdf

[文学研究]专题 RFID 的识别、轮询与估算 机制.pdf

  1. 1、本文档共58页,可阅读全部内容。
  2. 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
  3. 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载
  4. 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
[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

文档评论(0)

qiwqpu54 + 关注
实名认证
内容提供者

该用户很懒,什么也没介绍

1亿VIP精品文档

相关文档