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6th International ICST Conference on Wireless Internet, WICON 2011

作者： Fan, Juan Zhang, Sihai Zhou, Wuyang Wireless Information Network Lab. Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China

ISBN: (纸本)9783642304927

Joint radio resource management (JRRM) mechanism helps to optimize the radio resource usage of heterogeneous wireless networks but the introduction of central new entity which manages the information of all networks in JRRM may require unbearable change to current network architecture. Aiming at easily integrating with existing and forthcoming heterogeneous wireless networks, this paper proposes a semi-distributed scheme without centralized entity, in which user terminal make decision on network selection through fuzzy neural network method based on local information and the selected network finishes the admission control to user terminal according to its actual resource condition. Our scheme is verified by the simulation in the UMTS/WLAN scenario and can effectively balance the load between the UMTS/WLAN networks while maintaining the level of blocking probability compared to traditional distributed WLAN-prefer algorithm. © 2012 ICST Institute for Computer science, Social Informatics and Telecommunications Engineering.

关键词： Blocking probability

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The master-slave stochastic knapsack modelling for fully dynamic spectrum allocation

The master-slave stochastic knapsack modelling for fully dyn...

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6th International ICST Conference on Wireless Internet, WICON 2011

作者： Zhang, Sihai Yang, Fei Zhou, Wuyang Wireless Information Network Lab. Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China

ISBN: (纸本)9783642304927

Scarcity problem of radio spectrum resource stimulates the research on cognitive radio technology, in which dynamic spectrum allocation attracts lots of attention. For higher access efficiency in cognitive radio context, we suggest a fully dynamic resource allocation scheme for primary and secondary users, which is modelled by a master-slave stochastic knapsack process. Equilibrium behavior is analyzed, and expressions of blocking probability of both slave and master classes are derived as performance criterion and verified by numeric simulation, as well as forced termination probability of the secondary users. Compared to traditional opportunistic spectrum access (OSA), which can be regarded as half dynamic, our scheme leads to less termination events for the slaves while keeping the same behavior for the master class, promoting the system access performance. © 2012 ICST Institute for Computer science, Social Informatics and Telecommunications Engineering.

关键词： Cognitive radio

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A full-rate cooperative communication strategy in wireless relay networks

A full-rate cooperative communication strategy in wireless r...

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6th International ICST Conference on Wireless Internet, WICON 2011

作者： Zhan, Lei Yang, Fei Zhang, Sihai Zhou, Wuyang Wireless Information Network Lab. Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China

ISBN: (纸本)9783642304927

In this paper, we propose a new full-rate cooperative communication strategy in wireless relay networks without direct path between source and destination. This strategy coined full-rate amplify-and-forward (FRAF) utilizes multiple relay nodes to take turns to amplify and forward data package for the transmitter at different time slot. Thus the source node could continue sending without cessation. On the other hand, prevailing linear constellation precoding process is adopted at the source node to solve the problem caused by the imbalance of the error performance of the data sent at odd and even time slots. Furthermore, we analyze the outage probability and certificate that FRAF strategy can achieve the full diversity gain. The simulation results indicate that FRAF could improve the performance of the system effectively compared to the conventional amplify-and-forward (AF) and decode-and-forward (DF) strategy. © 2012 ICST Institute for Computer science, Social Informatics and Telecommunications Engineering.

关键词： Cooperative communication

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Energy-efficient distributed relay selection based on statistical channel state information

Energy-efficient distributed relay selection based on statis...

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6th International ICST Conference on Wireless Internet, WICON 2011

作者： Jiang, Haifang Zhang, Sihai Zhou, Wuyang Wireless Information Network Lab. Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China

ISBN: (纸本)9783642304927

In this paper, distributed relay selection algorithms based on statistical Channel State Information (CSI) in amplify-and-forward mode are proposed, aiming to maximize energy efficiency. With the limited CSI, a tradeoff is made between the total power consumption and the target outage probability at the source. A forwarding threshold is obtained by minimizing the average transmission power. Each relay individually decides whether to participate in forwarding the source signals according to the forwarding threshold. Firstly, a Distributed Multiple Relay Selection (DMRS) algorithm is proposed, in which all candidate relays have the possibility of transmitting the source signals and the threshold is obtained by numerical search. Then a Distributed Single Relay Selection (DSRS) algorithm with low complexity is investigated under the assumption that only one relay forwards the signals. Simulation results indicate that the proposed algorithms provide significant performance gain in terms of energy efficiency over the existing AF-mode relay selection algorithms. © 2012 ICST Institute for Computer science, Social Informatics and Telecommunications Engineering.

关键词： Energy efficiency

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Multi-sample clustering decision fusion for distributed target detection in wireless sensor networks

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Journal of China Universities of Posts and Telecommunications 2012年第SUPPL. 2期19卷 42-46+127页

作者： Chen, Lei Huang, Hai-Ping Wang, Ru-Chuan Qin, Xiao-Lin Wang, Qian-Yi College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

In this paper, we revisit the problem of target detection in wireless sensor networks (WSNs). Because that the practical environment of WSNs is very complex, and usually the target signal is mixed with a lot of random noises, the phenomenon impacts the performance of target detection experiment. This paper set forth a new way to improve the system performance. We introduce gather multiple sample when we get the observation signals. After obtaining the samples, we calculate the judgments of each sensor by fusion rule. At last local sensors transfer their judgments to the fusion center. We prove that the method is better than single sample through Monte Carlo experiments because of the full use of the observation signals. © 2012 The Journal of China Universities of Posts and Telecommunications.

关键词： Wireless sensor networks

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QoS-based data aggregation technology in wireless sensor networks

QoS-based data aggregation technology in wireless sensor net...

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2011 WASE Global Conference on science Engineering, GCSE 2011

作者： Chen, Zhengyu Yang, Geng Li, Guohua Xu, Jian Key Lab. of Broadband Wireless Communication and Sensor Network Technology Ministry of Education College of Computer Science and Technology Nanjing University of Post and Telecommunications Nanjing 210046 China School of Information Technology Jinling Institute of Technology Nanjing 211169 China

ISBN: (纸本)9783037852903

The main goal of data-aggregation algorithms in wireless sensor networks (WSNs) is to gather and aggregate data in an energy efficient manner so that network lifetime is enhanced. In this article, we focus on QoS-based data-aggregation problems in WSNs. Firstly, we provide a definition of the different QoS parameters for data aggregation, such as energy efficiency, network lifetime, data latency and data quality. Then, we compare the different algorithms on each QoS parameter, describe the main features of each algorithm, and highlight the trade-offs between each parameter. Finally, we conclude with possible future research directions on QoS-based data aggregation in WSNs.

关键词： Wireless sensor networks

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Tele-AR system based on real-time camera tracking

Tele-AR system based on real-time camera tracking

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2012 International Conference on Virtual Reality and Visualization, ICVRV 2012

作者： Wang, Yanke Zhong, Fan Li, Chao Xiang, Hui Peng, Qunsheng Qin, Xueying School of Computer Science and Technology Shandong University Jinan China Shandong Provincial Key Laboratory of Network Based Intelligent Computing Jinan China State Key Lab. of CAD and CG Zhejiang University Hangzhou China

ISBN: (纸本)9780769548364

We propose a visual tele-AR system, which is a combination of tele-existence and AR techniques. By wearing a video see-through HMD and moving his head, a user in this system is able to tele-operate a remote pan-tilt platform to observe the remote scene. Unlike traditional tele-existence systems which use mechanical or magnetic sensors for tele-operation, we propose a novel tele-operation method based on real-time tracking of master and slave cameras. The master camera is a component of the video see-through HMD mounted in front of user's eyes, while the slave camera is carried by a remote platform. We estimate use's head motion by tracking the master camera in real time, and translate head motions into motion commands to drive the remote pan-tilt platform. Ideally, motion of the remote platform will be exactly the same as user's head. Unfortunately, motion speed of the slave platform is usually limited by their mechanical capability, which may cause pose inconsistence between master and slave cameras, especially when user's head moves fast. We solve this problem by also tracking slave camera in real time, and warping video images according to difference between master and slave camera pose. Since slave camera is tracked, we can integrate virtual objects into remote scene, giving the user an augmented visual sense. To reduce system delay, our implementation is accelerated GPU parallel computation. Experimental results show the efficiency and robustness of our method. © 2012 IEEE.

关键词： Augmented reality

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Attribute-Based Authenticated Group key Management Protocol for Mobile Peer-to-Peer network

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China Communications 2012年第10期9卷 68-77页

作者： Zhang Guoyin Fu Xiaojing Ma Chunguang College of Computer Science and Technology Harbin Engineering University Harbin 150001 P. R. China Network and Data Security Key Laboratory of Sichuan Province University of Electronic Science and Technology of China Chengdu 611731 P. R. China

The authentication and privacy of a group member is important in multicast communication. This paper proposes a privacy-preserving authenticated group-key management protocol for the Mobile Peer-to-Peer network （ MP2PN ）. The MP2PN contains some super peers and each super peer controls a subgroup composed of regular peers. An efficient attribute-based signature based on Cipertext-Policy Attribute-Based Encryption （CP-ABE） is proposed and used in this group-key rmnagement protocol to authenticate a peer＇s at- tributes and identity. A peer can be described by a set of attributes or one unique special identity at- tribute. Peers that have some attributes in common can form a group and conmmnicate with each other anonymously and securely. Any super peer can initiate a group and act as a group controller. The group controller can authenticate a peer＇s attributes and identity as well as remove malicious peers. Any peer with attributes that rmtches the access structure can join the group and provide its input to form the group key. The proposed protocol pro- vides backward and forward secrecy. The sinmlation results show that this protocol is applicable for mobile devices and can meet the MP2PN requirements of group communication.

关键词： MP2PN group key tmnagement attribute-based signature anonymous conmmnica tion

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A genetic clustering algorithm using a message-based similarity measure

A genetic clustering algorithm using a message-based similar...

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作者： Chang, Dongxia Zhao, Yao Zheng, Changwen Zhang, Xianda Institute of Information Science Beijing Jiaotong University Beijing Key Laboratory of Advanced Information Science and Network Technology Beijing 100044 China National Key Lab of Integrated Information System Technology Institute of Software Chinese Academy of Sciences Beijing 100080 China Tsinghua Department of Automation Tsinghua University Beijing 100084 China

In this paper, a genetic clustering algorithm is described that uses a new similarity measure based message passing between data points and the candidate centers described by the chromosome. In the new algorithm, a variable-length real-value chromosome representation and a set of problem-specific evolutionary operators are used. Therefore, the proposed GA with message-based similarity (GAMS) clustering algorithm is able to automatically evolve and find the optimal number of clusters as well as proper clusters of the data set. Effectiveness of GAMS clustering algorithm is demonstrated for both artificial and real-life data set. Experiment results demonstrated that the GAMS clustering algorithm has high performance, effectiveness and flexibility. © 2011 Elsevier Ltd. All rights reserved.

关键词： Clustering algorithms

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Study on sensor for solution concentration and temperature based on fused tapering optical fiber coupler

Study on sensor for solution concentration and temperature b...

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2012 International Symposium on Photonics and Optoelectronics, SOPO 2012

作者： Lv, Min Ren, Guobin Yang, Xiaoyu Ding, Jianbo Wang, Wenzhong College of Science Minzu University of China Beijing 100081 China Key Lab. of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781457709111

A simple and high-degree accuracy sensor for solution concentration and temperature based on fused tapering optical fiber coupler is fabricated. The change of refractive index in the evanescent field on the fused region of an optical fiber coupler shifts the output coupling visibility. Therefore the coupling visibility is changed with variation of solution concentration (refractive index) and temperature surrounding the fused tapering zone of the coupler. The sodium chloride solution is studied experimentally. Based on the experiment data and the least square method, the concentration accuracy of the coupler sensor is evaluated to be 10e-3 and the temperature accuracy is about 0.823°C. The stability of the sensor system with the optical coupler can reach the order of 10e-4. This simple, low-cost, good-stability and high-degree accuracy coupler sensor is suitable to be used in the environmental monitoring, analytical chemistry, and food safety testing. © 2012 IEEE.

关键词： Refractive index

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