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A New RFID Anti-collision Algorithm Based on the Q-Ary Search Scheme

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Chinese Journal of Electronics 2015年第4期24卷 679-683页

作者： SU Jian wen guangjun HONG Danfeng School of Communication and Information Engineering University of Electronic Science and Technology of China College of Information Engineering Qingdao University

Deterministic tree-based algorithms are mostly used to guarantee that all the tags in the reader field are successfully identified, and to achieve the best performance. Through an analysis of the deficiencies of existing tree-based algorithms, a Q-ary search algorithm was proposed. The Q-ary search(QAS) algorithm introduced a bit encoding mechanism of tag ID by which the multibit collision arbitration was implemented. According to the encoding mechanism, the collision cycle was reduced. The theoretical analysis and simulation results showed that the proposed MS algorithm overcame the shortcoming of existing tree-based algorithms and exhibited good performance during identification.

关键词： Radio frequency identification(RFID) Anti-collision Encoding Energy efficiency

A Collision Arbitration Protocol Based on Specific Selection Function

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Chinese Journal of Electronics 2017年第4期26卷 864-870页

作者： SU Jian REN Yuqing YANG Ying HAN Yu wen guangjun Nanjing University of Information Science and Technology University of Electronic Science and Technology of China Nanjing University of Science and Technology Chengdu University of Technology

Fast and effective identifications of a large number of items are required in many Radio-frequency identification(RFID) applications. Simultaneous responses from multiple tags are corrupted by collisions and thus result in low identification efficiency. To address the problem of low identification efficiency, many existing tag anticollision algorithms try to schedule the identification process to avoid collisions. A novel anti-collision scheme based on specific selection function is presented, in which tags pick a slot according to a selection function instead of being randomly assigned to slots within a frame. If collision occurs, the reader sends the custom command SETBM according to the collision information. When probed by the SETBM, the tags apply the selection function to its partial ID and send the mapped result to the reader. According to the mapped result, the reader assigns the time slot to the tags. All tags collided in the same slot will be identified by the tree traversal scheme. Compared to the most of existing anti-collision algorithms, simulation results show that our proposed algorithm can achieve better performance in terms of identification efficiency, time efficiency, and energy consumption.

关键词： RFID Anti-collision Time efficiency En ergy consumption

acSB:Anti-Collision Selective-Based Broadcast Protocol in CRAdHocs

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Computers, Materials & Continua 2018年第7期56卷 35-46页

作者： Yueyue Li Zhong Huang Yugang Ma guangjun wen Univeristy of Electronic Science and Technology of China Qingshuihe CampusNo.2006Xiyuan AveWest Hi-Tech ZoneChengduSichuan611731China Institute for Infocomm Research A*STAR1 Fusionopolis Way#21-01 Connexis(South Tower)138632Singapore

As a fundamental operation in ad hoc networks,broadcast could achieve efficient message *** y in the cognitive radio ad hoc network where unlicensed users have different sets of available channels,broadcasts are carried out on multiple ***,channel selection and collision avoidance are challenging issues to balance the efficiency against the reliability of *** this paper,an anticollision selective broadcast protocol,called acSB,is proposed.A channel selection algorithm based on limited neighbor information is considered to maximize success rates of transmissions once the sender and receiver have the same ***,an anticollision scheme is adopted to avoid simultaneous ***,the proposed broadcast acSB outperforms other approaches in terms of smaller transmission delay,higher message reach rate and fewer broadcast collisions evaluated by simulations under different scenarios.

关键词： Broadcast protocol selective protocol collision avoidance distributed data dissemination cognitive radio ad hoc network

A Cross Layer Protocol for Fast Identification of Blocked Tags in Large-Scale RFID Systems

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Computers, Materials & Continua 2020年第9期64卷 1705-1724页

作者： Chu Chu Zhong Huang Rui Xu guangjun wen Lilan Liu School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu611731China School of Engineering University of British ColumbiaKelownaV1V 1V7Canada

Blocker tag attack is one of the denial-of-service(DoS)attacks that threatens the privacy and security of RFID *** attacker interferes with the blocked tag by simulating a fake tag with the same ID,thus causing a collision of message *** many practical scenarios,the number of blocked tags may vary,or even be *** example,the attacker may only block the important customers or high-value *** avoid the disclosure of privacy and economic losses,it is of great importance to fast pinpoint these blocked ***,existing works do not take into account the impact of the number of blocked tags on the execution time and suffer from incomplete identification of blocked tags,long identification time or privacy *** overcome these limits,we propose a cross layer blocked tag identification protocol(CLBI).CLBI consists of multiple rounds,in which it enables multiple unblocked tags to select one time slot and concurrently verify them by using tag estimation in physical *** from the utilization of most collision slots,the execution time can be greatly ***,for efficient identification of blocked tags under different proportions,we propose a hybrid protocol named adaptive cross layer blocked tag identification protocol(A-CLBI),which estimates the remaining blocked tag in each round and adjusts the identification strategy *** simulations show that our protocol outperforms state-of-the-art blocked tags identification protocol.

关键词： RFID blocked tag physical layer estimation identification

A novel approach to design microwave medium of negative refractive index and simulation verification

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Chinese Science Bulletin 2007年第4期52卷 433-439页

作者： CAO YunJian wen guangjun WU KaiMin XU XinHe School of Communication and Information Engineering University of Electronic Science and Technology of China Chengdu 610054 China

In this paper, a novel approach is presented to synthesize microwave medium of negative refractive index by incorporating metallic wire array with negative effective permittivity into the host media such as ferrimagnet-YIG (yttrium iron garnet) applied by external magnetic field whose permeability is negative. We have designed the composite medium having negative refractive index in C/X band frequencies, analyzed and simulated its electromagnetic (EM) properties by use of EM EDA package based on time-domain finite integration method. The simulation results show that: ① the effective permittivity of the designed metallic wire array is negative in the frequency range from 7.02 GHz to 9.80 GHz; ② the permeability of YIG substrate immersed into an external magnetic field is negative in the frequency range from 5.22 GHz to 8.14 GHz; ③ EM wave can pass through the composite medium synthesized by the above designed metallic wire array and YIG substrate, and ④ the negative refraction behavior occurs on the interface between the composite medium and the normal material with positive refractive index in 7.51―8.13 GHz frequency range, in which the effective permittivity of the metallic wire array and the permeability of YIG substrate are negative simultaneously. The full wave simulation has demonstrated that the effective refractive index of the designed composite medium is indeed negative and ascertained that the proposed approach to design microwave medium with negative refractive index is viable.

关键词：铁氧磁材料铁磁材料负折射率微波介质设计模拟验证电磁性质

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A Physical Layer Algorithm for Estimation of Number of Tags in UHF RFID Anti-Collision Design

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Computers, Materials & Continua 2019年第7期61卷 399-408页

作者： Zhong Huang Jian Su guangjun wen wenxian Zheng Chu Chu Yijun Zhang Yibo Zhang School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu611731China Nanjing University of Information Science&Technology Nanjing210044China Shenzhen Intellifusion Technologies Co. Shenzhen518000China School of Foreign Languages University of Electronic Science and Technology of ChinaChengdu611731China Department of Mechanical Engineering University of British ColumbiaVancouverCanada

A priori knowledge of the number of tags is crucial for anti-collision protocols in slotted UHF RFID *** number of tags is used to decide optimal frame length in dynamic frame slotted ALOHA(DFSA)and to adjust access probability in random access *** researches estimate the number of tags in MAC layer based on statistics of empty slots,collided slots and successful ***,a collision detection algorithm is employed to determine types of time *** three types are distinguished because of lack of ability to detect the number of tags in single time *** this paper,a physical layer algorithm is proposed to detect the number of tags in a collided *** shift algorithm is utilized,and some properties of backscatter signals are *** results verify the effectiveness of the proposed solution in terms of low estimation error with a high SNR range,outperforming the existing MAC layer approaches.

关键词： UHF RFID anti-collision cluster algorithm

A Dynamic Multi-ary Query Tree Protocol for Passive RFID Anti-collision

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Computers, Materials & Continua 2022年第9期72卷 4931-4944页

作者： Gang Li Haoyang Sun Zhenbing Li Peiqi Wu Daniele Inserra Jian Su Xiaochuan Fang guangjun wen Centre for RFIC and System School of Information and Communication EngineeringUniversity of Electronic Science and Technology of ChinaChengdu611731P.R.China Nanjing University of Information Science&Technology Nanjing210044China Queen Mary University of London LondonUnited Kingdom

In this paper,a dynamic multi-ary query tree(DMQT)anti-collision protocol for Radio Frequency Identification(RFID)systems is proposed for large scale passive RFID tag *** proposed DMQT protocol is based on an iterative process between the reader and tags which identifies the position of collision bits through map commands and dynamically encodes them to optimize slots allocation through query *** this way,the DMQT completely eliminates empty slots and greatly reduces collision slots,which in turn reduces the identification time and energy *** addition and differently to other known protocols,the DMQT does not need to estimate the number of tags,reducing the protocol implementation complexity and eliminating the uncertainty caused by the estimation algorithm.A numerical analysis shows that DMQT has better performance than other algorithms for a number of tags larger than ***,when the number of tags is 2000 and the tag identity(ID)length is 128 bits,the total identification time is 2.58 s and the average energy cost for a tag identification is 1.2 mJ,which are 16.9%and 10.4%less than those of state-of-the-art algorithms,*** addition,a DMQT extension based on ACK command has also been presented to deal with capture effect and avoid missing identification.

关键词： Anti-collision DMQT RFID dynamic multi-ary query seamless identification

MEMS and MOEMS Gyroscopes: A Review

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Photonic Sensors 2023年第4期13卷 73-98页

作者： wenyi HUANG Xing YAN Sengyu ZHANG Zhe LI Jamal NAHASSAN Dingwei CHEN guangjun wen Kai CHEN Guangwei DENG Yongjun HUANG School of Information and Communication Engineering Sichuan Provincial Engineering Research Center of Communication Technology for Intelligent IoTUniversity of Electronic Science and Technology of ChinaChengdu 611731China School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

Micro-gyroscopes using micro-electro-mechanical system(MEMS)and micro-optoelectro-mechanical system(MOEMS)are the new-generation and recently well-developed gyroscopes produced by the combinations of the traditional gyroscope technology and MEMS/MOEMS *** to the working principle and used materials,the newly-reported micro-gyroscopes in recent years include the silicon-based micromechanical vibratory gyroscope,hemispherical resonant gyroscope,piezoelectric vibratory gyroscope,suspended rotor gyroscope,microfluidic gyroscope,optical gyroscope,and atomic *** to different sensitive structures,the silicon-based micromechanical vibratory gyroscope can also be divided into double frame type,tuning fork type,vibrating ring type,and nested ring *** those micro-gyroscopes,in recent years,many emerging techniques are proposed and developed to enhance different aspects of performances,such as the sensitivity,angle random walk(ARW),bias instability(BI),and ***,this paper will firstly review the main performances and applications of those newly-developed MEMS/MOEMS gyroscopes,then comprehensively summarize and analyze the latest research progress of the micro-gyroscopes mentioned above,and finally discuss the future development trends of MEMS/MOEMS gyroscopes.

关键词： Micro-gyroscope MEMS MOEMS angular random walk bias instability

A Novel Anti-Collision Algorithm for Large Scale of UHF RFID Tags Access Systems

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Computers, Materials & Continua 2024年第7期80卷 897-912页

作者： Xu Zhang Yi He Haiwen Yi Yulu Zhang Yuan Li Shuai Ma Gui Li Zhiyuan Zhao Yue Liu Junyang Liu guangjun wen Jian Li School of Information and Communication Engineering/Yibin Institute University of Electronic Science and Technology of ChinaChengdu611731China Department of IoT Technology Research China Mobile Research InstituteBeijing100053China The 10th Research Institute of China Electronics Technology Group Corporation Chengdu611731China College of Information and Communication National University of Defense TechnologyWuhan430019China

When the radio frequency identification(RFID)system inventories multiple tags,the recognition rate will be seriously affected due to *** on the existing dynamic frame slotted Aloha(DFSA)algorithm,a sub-frame observation and cyclic redundancy check(CRC)grouping combined dynamic framed slotted Aloha(SUBF-CGDFSA)algorithm is *** algorithm combines the precise estimation method of the quantity of large-scale tags,the large-scale tags grouping mechanism based on CRC pseudo-randomcharacteristics,and the Aloha anti-collision optimization mechanism based on sub-frame *** grouping tags and sequentially identifying themwithin subframes,it accurately estimates the number of remaining tags and optimizes frame length accordingly to improve efficiency in large-scale RFID *** outcomes demonstrate that this proposed algorithmcan effectively break through the system throughput bottleneck of 36.8%,which is up to 30%higher than the existing DFSA standard scheme,and has more significant advantages,which is suitable for application in largescale RFID tags scenarios.

关键词： Radio frequency identification anti-collision tags grouping dynamic framed slotted Aloha