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Passive IoT Localization Technology Based on SD-PDOA in NLOS and Multi-Path Environments

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Computers, Materials & Continua 2024年第7期80卷 913-930页

作者： Junyang Liu Yuan Li Yulu Zhang Shuai Ma Gui Li Yi He Haiwen Yi Yue Liu Xiaotao Xu Xu Zhang Jinyao He 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

Addressing the challenges of passive Radio Frequency Identification(RFID)indoor localization technology in Non-Line-of-Sight(NLoS)and multipath environments,this paper presents an innovative approach by introducing a combined technology integrating an improved Kalman Filter with Space Domain Phase Difference of Arrival(SD-PDOA)and Received Signal Strength Indicator(RSSI).This methodology utilizes the distinct channel characteristics in multipath and NLoS contexts to effectively filter out interference and accurately extract localization information,thereby facilitating high precision and stability in passive RFID *** efficacy of this approach is demonstrated through detailed simulations and empirical tests conducted on a custom-built experimental platform consisting of passive RFID tags and an R420 *** findings are significant:in NLoS conditions,the four-antenna localization system achieved a notable localization accuracy of 0.25 m at a distance of 5 *** complex multipath environments,this system achieved a localization accuracy of approximately 0.5 m at a distance of 5 *** compared to conventional passive localization methods,our proposed solution exhibits a substantial improvement in indoor localization accuracy under NLoS and multipath *** research provides a robust and effective technical solution for high-precision passive indoor localization in the Internet of Things(IoT)system,marking a significant advancement in the field.

关键词： Indoor localization multipath and NLoS environments combined SD-PDOA and RSSI technology

基于延迟断点映射FMCW的双功能雷达通信系统设计

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电子科技大学学报 2024年第2期53卷 210-218页

作者：徐瑞文瑞铭黄子涵李钢文光俊电子科技大学信息与通信工程学院成都611731 电子科技大学信息与软件工程学院成都611731

基于调频连续波(Frequency Modulated Continuous Wave, FMCW)的双功能雷达通信(Dual-Functional RadarCommunication, DFRC)系统具有时频利用率高、抗多普勒性能强、距离旁瓣低的特点。现有的FMCW-DFRC波形系统产生双功能性能恶化,并... 详细信息

基于调频连续波(Frequency Modulated Continuous Wave, FMCW)的双功能雷达通信(Dual-Functional RadarCommunication, DFRC)系统具有时频利用率高、抗多普勒性能强、距离旁瓣低的特点。现有的FMCW-DFRC波形系统产生双功能性能恶化,并增加通信接收机的链路复杂度。设计了一种基于延迟断点映射(Delayed Breakpoint Mapping, DBM)FMCW的DFRC系统,通过啁啾周期内延迟断点位置的映射和被分割的簇间的相位进行数据调制。通信接收端在载波混频和欠采样后,在数字域实现去啁啾、码片对齐和数据解调,极大降低了接收端生成相干信号和ADC性能的需求。在雷达处理链路中,设计了断点区域删除与拼接(Breakpoint Area Deletion and Splicing, BADS)方案,使DFRC的雷达性能与无调制的FMCW一致。仿真结果表明,与无补偿的方案相比,BADS方案距离图像的副瓣幅度减小约37 dB,且不受调制数据的影响。与现有基于啁啾波形的DFRC方案的通信性能相比,DBM-FMCW降低了约3 dB误符号率。

关键词：啁啾信号双功能雷达通信调频连续波旁瓣抑制欠采样

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Efficient and robust missing key tag identification for large-scale RFID systems

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Digital Communications and Networks 2023年第6期9卷 1421-1433页

作者： Chu Chu guangjun wen Jianyu Niu School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu611731China Research Institute of Trustworthy Autonomous Systems Southern University of Science and TechnologyShenZhen518055China School of Engineering The University of British ColumbiaKelownaV1V 1V7BCCanada

Radio Frequency Identification(RFID)technology has been widely used to identify missing *** many applications,rapidly pinpointing key tags that are attached to favorable or valuable items is *** realize this goal,interference from ordinary tags should be avoided,while key tags should be efficiently *** many previous studies,how to rapidly and dynamically filter out ordinary tags when the ratio of ordinary tags changes has not been ***,how to efficiently verify missing key tags in groups rather than one by one has not been explored,especially with varying missing *** this paper,we propose an Efficient and Robust missing Key tag Identification(ERKI)protocol that consists of a filtering mechanism and a verification ***,the filtering mechanism adopts the Bloom filter to quickly filter out ordinary tags and uses the labeling vector to optimize the Bloom filter's performance when the key tag ratio is ***,the verification mechanism can dynamically verify key tags according to the missing rates,in which an appropriate number of key tags is mapped to a slot and verified at ***,we theoretically analyze the parameters of the ERKI protocol to minimize its execution *** numerical results show that ERKI can accelerate the execution time by more than 2.14compared with state-of-the-art solutions.

关键词： RFID Missing key tag identification Time efficiency Robust

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

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差分阵列式虚拟高精度陀螺仪研究与实现

导航定位与授时 2024年第4期11卷 138-150页

作者：易海雯陈渡蒋浩淼白海乐李钢文光俊黄勇军电子科技大学信息与通信工程学院成都611731

针对单一MEMS惯性陀螺仪精度低、随机噪声大,无法满足高精度应用场景要求的问题,提出了一种基于差分MEMS惯性传感器阵列的虚拟陀螺仪。设计并实现了由2N个消费级传感器构成的虚拟陀螺仪系统,其中正面N个传感器三轴同向,且与反面N个传感... 详细信息

针对单一MEMS惯性陀螺仪精度低、随机噪声大,无法满足高精度应用场景要求的问题,提出了一种基于差分MEMS惯性传感器阵列的虚拟陀螺仪。设计并实现了由2N个消费级传感器构成的虚拟陀螺仪系统,其中正面N个传感器三轴同向,且与反面N个传感器三轴反向。2N个传感器共同组成N个差分传感器对,形成一个差分传感器阵列。同时,基于单一MEMS惯性陀螺仪的输出模型,对差分阵列式虚拟陀螺仪输出进行建模分析,通过将正反面传感器输出进行差分均值融合,实现了一个高精度虚拟陀螺仪输出。最后,利用陀螺仪零偏、零偏稳定性和Allan方差分析虚拟陀螺仪的确定性误差和随机噪声等特性。结果表明,在静止状态下,差分阵列式虚拟陀螺仪能够有效降低陀螺仪的零偏和零偏稳定性。与单一MEMS陀螺仪相比,差分阵列式虚拟陀螺仪的x,y,z轴角度随机游走降低约73%,速度随机游走降低约77%,即差分阵列式虚拟陀螺仪能有效地抑制MEMS惯性陀螺仪的随机噪声,提高传感器输出精度。

关键词： MEMS惯性传感器 IMU阵列虚拟陀螺仪差分融合 Allan方差

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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