检索结果-南通市图书馆

Review of reader antennas for UHF rfid systems

The Journal of China Universities of Posts and Telecommunications 2023年第5期30卷 72-92页

作者： Niu Yaohui Li Xiuping Zhao Wenyu State Key Laboratory of Information Photonics and Optical Communications Beijing 100876China Key Laboratory of Universal Wireless Communications of Ministry of Education Beijing 100876China Beijing Key Laboratory of Work Safety Intelligent Monitoring Beijing 100876China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

Radio-frequency identification(rfid)antennas are critical components in wireless communication networks for the Internet of things(IoT).The rfid systems make it possible to realize the dynamic interconnection of various things.To better summarize the operating principles of the rfid antennas and associate antennas with specific complex applications,a review of rfid systems and antennas is necessary.In this paper,a review of reader antennas for ultra-high frequency(UHF)rfid systems is presented,and the categories of rfid systems are summarized for the first time.The antennas are classified according to the reading region and operating principle.The reading region determines the most crucial performance that should be concentrated on when designing an antenna,while the operating principle affects the current distribution on the surface of the antenna,and further the electromagnetic radiation.By the summary of the rfid systems and antennas,the understanding of future researchers on the operating principles of the rfid antennas could be facilitated,which can be helpful in the advanced design and implementation of rfid antennas.In addition,taking engineering requirements into account,the future prospective of rfid applications is discussed,as well as the challenges to be addressed.

关键词： radio frequency identification(rfid) near-field antenna ultra-high frequency(UHF) rfid system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A query index for continuous queries on rfid streaming data

引用

Science in China(Series F) 2008年第12期51卷 2047-2061页

作者： Jaekwan PARK Bonghee HONG Chaehoon BAN Department of Computer Engineering Pusan National University Department of Internet Application College of Information & Technology

rfid middleware collects and filters rfid streaming data to process applications＇ requests called continuous queries, because they are executed continuously during tag movement. Several approaches to building an index on queries rather than data records, called a query index, have been proposed to evaluate continuous queries over streaming data. EPCglobal proposed an Event Cycle Specification （ECSpec） model, which is a de facto standard query interface for rfid applications. Continuous queries based on ECSpec consist of a large number of segments that represent the query conditions. The problem when using any of the existing query indexes on these continuous queries is that it takes a long time to build the index, because it is necessary to insert a large number of segments into the index. To solve this problem, we propose a transform method that converts a group of segments into compressed data. We also propose an efficient query index scheme for the transformed space. Comparing with existing query indexes, the performance of proposed index outperforms the others on various datasets.

关键词： rfid system middleware continuous query stabbing query query index

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Survey of the Advances in Reader Anti-collision Algorithms for rfid systems

Survey of the Advances in Reader Anti-collision Algorithms f...

引用

2011 Chinese Control and Decision Conference（CCDC）

作者： Zhonghua Li is with the School of Information Science and Technology,Sun Yat-sen University,Guangzhou 510006,Guangdong Province,China.Chunhui He is with the School of Information Science and Technology,Sun Yat-sen University,Guangzhou 510006,Guangdong Province,China.Hong-Zhou Tan is with the School of Information Science and Technology,Sun Yat-sen University,Guangzhou 510006,Guangdong Province,China.

In rfid systems,applying multiple readers will cause communication conflict or data interference (i.***.reader collision) when the readers within the interference region of each other attempt to access a tag by using the same frequency channel and at the same time.In order to solve this reader collision problem,many reader anti-collision algorithms have been proposed.This paper attempts to globally review of the main reader anti-collision algorithms and to further compare among these algorithms,and discusses the prospect of research and development in reader anti-collision field.

关键词： rfid system reader anti-collision algorithm

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A Fast Approach to Unknown Tag Identification in Large Scale rfid systems

A Fast Approach to Unknown Tag Identification in Large Scale...

引用

第十一届全国博士生学术年会——信息技术与安全专题

作者： Xiulong Liu Keqiu Li Yanming Shen Geyong Min§ Bin Xiao Wenyu Qu Hongjuan Li School of Computer Science and Technology Dalian University of Technology School of Computing Informatics and MediaUniversity of BradfordU.K. Department of Computing The Hong Kong Polytechnic University School of Information Science and Technology Dalian Maritime University

Radio Frequency Identification（rfid） technology has been widely applied in many scenarios such as inventory control,supply chain management due to its superior properties including fast identification and relatively long interrogating range over barcode systems.It is critical to efficiently identify the unknown tags because these tags can appear when new tagged objects are moved in or wrongly placed.The state-of-the-art Basic Unknown tag Identification Protocol-with Collision-Fresh slot paring（BUIP-CF） protocol can first deactivate all the known tags and then collect all the unknown tags.However,BUIP-CF protocol investigates an ALOHA-like technique and causes too many tag responses,which results in low efficiency.This paper proposes a Fast Unknown tag Identification（FUI） protocol which investigates an indicator vector to label the unknown tags with a given accuracy and removes the time-consuming tag responses in the deactivation phase.FUI also adopts the classical Enhanced Dynamic Framed Slotted ALOHA（EDFSA） protocol to collect the labeled unknown tags.We then investigate the optimal parameter settings to maximize the performance of the proposed FUI protocol.Extensive simulation experiments are conducted to evaluate the performance of the proposed FUI protocol and the experimental results show that it considerably outperforms the state-of-the-art protocol.

关键词： rfid system Unknown Tags Identification Time-efficiency

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：