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Quantum particle swarm optimization based search space partition with application to continuous space optimization

Journal of Information and Computational Science 2012年第2期9卷 521-531页

作者： Li, Junying Shen, Yudi Liu, Haitao Key Lab of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Science Shanghai 200050 China Wuxi SensingNet Industrialization Research Institute Wuxi 214135 China

In view of the slowness and the locality of convergence for Particle Swarm Optimization (PSO) in solving complex continuous space optimization problems. Based the idea of wavelet analysis and quantum algorithm, this paper introduces an improved technique called quantum particle swarm optimization based search space partition (SSPQPSO). In this algorithm, the search space partition method is used to increase search accuracy and inhibit premature problem. The positions of particles are encoded by the probability amplitudes of quantum bit. Each quantum bit contains two probability amplitudes, which accelerate the process of searching. Two typical examples indicate that the novel algorithm possesses several advantages such as less chance of being trapped into premature states, higher accuracy and higher stability. As a result, SSPQPSO can be widely applied to many complex continuous space optimization problems which require higher accuracy. Copyright © 2012 Binary Information Press.

关键词： Particle swarm optimization (PSO)

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NLOS error mitigation in mobile location based on modified extended Kalman filter

NLOS error mitigation in mobile location based on modified e...

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IEEE Conference on wireless communications and networking

作者： Xin Zhou A-Long Jin Qingmin Meng National Mobile Communications Research Laboratory South East University Nanjing China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education China Nanjing University of Posts and Telecommunications Nanjing China

Geolocation and tracking of mobile objects is an important issue in wireless communication networks. Various methods have been devised and implemented to deal with such problems whose performance is particularly limited in non-line-of-sight propagation conditions. In this paper, we take advantage of the extended Kalman filter with some extensions, modifications and improvement of previous work to reduce the NLOS error in the location measurement. One of the key contributions of this paper is to present the methods that discriminate the NLOS measurements from the LOS measurements based on the standard deviation and K-means clustering and reconstruct the LOS measurements out of the NLOS measurements by polynomial fit in order to mitigate the NLOS error. Simulation results confirm the effectiveness and accuracy of our approach in comparison with the conventional EKF algorithm. Moreover, we do not model the distribution of the NLOS error due to its intractability.

关键词： Nonlinear optics Measurement uncertainty Noise Mobile communication Polynomials Accuracy Kalman filters

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A New Handover Mechanism for Femtocell-to-Femtocell

A New Handover Mechanism for Femtocell-to-Femtocell

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International Conference on wireless communications and Signal Processing

作者： Yidan Zhuang Su Zhao Xiaorong Zhu Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education (Nanjing University of Posts & Telecommunications)

ISBN: (纸本)9781467358309

Femtocell networks which use femtocell access point (FAP) and existing networks as backhaul connectivity can meet the requirement of high data rate for wireless communication system as well as solve the indoor coverage problem. The handover from femtocell to femtocell is quite demanding and complicated because there are hundreds of possible target FAPs when mobile station (MS) moves out from the coverage of its serving FAP. In this paper, we propose a new mechanism for femtocell-to-femtocell handover which considers several factors such as received signal level, the hidden FAP problem and the access mode of femtocell. The simulation results show that our proposed scheme has a lower handover failure rate and a smaller neighbor femtocell list than the traditional scheme which is based on received signal level only.

关键词： handover femtocell received signal strength indicator femtocell access point

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Gossip-Based Indexing Ring Topology for 2-Dimension Spatial Data in Overlay networks

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Procedia Engineering 2012年 29卷 3727-3731页

作者： Z.Q. Zou Y. Wang B. Hu R.C. Wang College of Computer Nanjing University of Posts and TelecommunicationsNanjing Jiangsu 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing Jiangsu 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education Jiangsu Province Nanjing Jiangsu 210003 China Key Laboratory of Virtual Geographic Environment Ministry of Education Nanjing Normal University Nanjing 210046 China

Overlay networks are used widely in the Internet, such as retrieval and share of files, multimedia games and so on. However, in distributed system, the retrieval and share of 2-dimension spatial data still have some difficult problems and can not solve the complex retrieval of 2-dimension spatial data efficiently. This article presents a new indexing overlay networks, named 2D-Ring, which is the ring topology based on gossip for 2-dimension spatial data. The peers in our overlay networks exchange the information periodically and update each local view by constructing algorithm. 2-dimension spatial data is divided by quad-tree and mapped into control points, which are hashed into 2D-Ring by SHA-1 hash function. In such way, the problem of 2-dimension spatial data indexing is converted to the problem of searching peers in the 2D-Ring. A large of extensive experiments show that the time complexity of constructing algorithm of 2D-Ring can reach convergence logarithmically as a function of the network size and hold higher hit rate and lower query delay.

关键词： Overlay networks 2-Dimension Spatial Data Indexing Gossip

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Resource Allocation Scheme for Device-to-Device communication Underlying LTE Downlink network

Resource Allocation Scheme for Device-to-Device Communicatio...

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International Conference on wireless communications and Signal Processing

作者： Ran An Jun Sun Su Zhao Shixiang Shao Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education (Nanjing University of Posts & Telecommunications)

ISBN: (纸本)9781467358309

Future cellular networks such as IMT-Advanced are expected to allow Device-to-Device (D2D) communication as an underlay. During the downlink period, both of the D2D receiver and cellular user will suffer from interference caused by radio resource sharing. In this paper, a joint resource allocation and resource reuse scheme is investigated, in which resource allocation to cellular users is employed on proportional fair algorithm and resource reuse to D2D users is employed on a greedy heuristic algorithm. The greedy heuristic algorithm determines the D2D mode is appropriate or not by path loss comparison, then decreases the interference to cellular user by selection of the minimum channel gain between cellular user and D2D transmitter each time. System simulations in two different scenarios demonstrate that sum throughput of cellular user and D2D pair is improved using the proposed scheme, and the interference to cellular user is under control.

关键词： Device-to-Device resource allocation mode selection resource reuse interference control

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IOT platform-oriented Socket design and optimization

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and technology Edition) 2012年第SUPPL. 1期42卷 290-294页

作者： Wang, Kun Yu, Yue Zhang, Yu-Hua Guo, Huang Wang, Lin-Lin Key Lab. of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

An efficient design for a Socket server with buffer pool and a thread pool for concurrent request on the IOT platform is presented. This reduces the system overhead and buffer usage to the largest extent while faced with a large number of connections and digital requests. The simulation results show that a Socket server with a thread pool and buffer pool could lower the overhead on the context switch of threads as well as the I/O blocking.

关键词： Lakes

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Bacterial foraging optimization algorithm based routing strategy for wireless sensor networks

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International Review on Computers and Software 2012年第6期7卷 2826-2830页

作者： Chen, Zhi Li, Shuai Yue, Wenjing Hu, Luoquan Sun, Wanxin College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China State Key Laboratory for Novel Software Technology Nanjing University Nanjing 210093 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China Suzhou Entry-Exit Inspection and Quarantine Bureau Suzhou 215104 China

In order to improve energy efficiency, the bacterial foraging optimization algorithm (OBFOA) is applied into the routing strategy for wireless sensor networks. The proposed strategy makes proper improvements on bacteria's foraging operation to improve the performance of the algorithm, such as the adaptive step strategy in the swimming operation and the comprehensive selection mechanism in the tumbling operation. OBFOA builds optimized data transfer paths in wireless sensor networks through the processes of chemotaxis, global quorum sensing mechanisms, reproduction and elimination-dispersal. Simulation results show that the proposed strategy can balance the energy consumption of nodes effectively and prolong the overall network lifetime. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.

关键词： wireless sensor networks

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Packet sending algorithm based on bundle protocol in DTN networks

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and technology Edition) 2012年第SUPPL. 1期42卷 285-289页

作者： Wang, Kun Yu, Yue Zhang, Yu-Hua Guo, Huang Wang, Lin-Lin Key Lab. of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

Bundle and block were introduced into DTN transmission protocol, which shred data into bits to deal with frequent interruption in DTN network. Bundle and LTP protocol in DTN transmission layer were put forward, and the impact of block size on transmission efficiency was investigated when network environment probably vary dramatically in a short time. Finally we put forward a Bundle sending algorithm that dynamically changes its strategy in DTN network to achieve the best transmission efficiency and system performance. Simulation results show that selecting proper size of data block can increase the transmission effectiveness.

关键词： Efficiency

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The Neighbors Selection Algorithm in WSN for routing and localization

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Journal of Information and Computational Science 2012年第4期9卷 1017-1025页

作者： Ma, Runze Yu, Zhijun Liu, Haitao Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Key Lab of Wireless Sensor Network and Communication Shanghai 200050 China Wuxi Sensing Net Industrialization Research Institute Wuxi Jiangsu 214135 China

There are some problems on the neighbor nodes selection method in wireless sensor networks. The Neighbors Selection Algorithm, based on the communication energy consumption between pairs of nodes, is proposed and applied to enhance the DV routing protocol and DV-Hop localization algorithm. According to the simulation results, in the networks where the node radio range is larger than the average distance between adjacent nodes, the modified routing method could cut down the routing energy consumption, and the modified localization algorithm could achieve better localization accuracy. Copyright © 2012 Binary Information Press.

关键词： Routing protocols

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Quality-delay tradeoff for video streaming over mobile ad hoc networks

Quality-delay tradeoff for video streaming over mobile ad ho...

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IEEE International Conference on communications (ICC)

作者： Liang Zhou Yan Zhang Joel Rodrigues Benoit Geller Jingwu Cui Baoyu Zheng Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications China Simula Research Laboratory Norway Instituto de Telecomunicaçőes University of Beira Interior Portugal Laboratory of UEI ENSTA Paristech France

In this work, we study the quality-delay tradeoff for video streaming over mobile ad hoc network by utilizing a class of scheduling schemes. We show that node spatial mobility indeed impacts on the performance of wireless video transmission under the assumption that all the nodes can identically and uniformly visit the entire network. To describe a practical mobile scenario, we consider a random walk mobility model in which each node can randomly and independently choose its mobility direction at each time-slot. The contributions of this work are twofold: 1) It investigates the optimal node velocity for the mobile video network which helps to identify the impact of mobility on the video performance; 2) It derives the achievable quality-delay tradeoff range for any node mobility velocity, and thus it is helpful to design appropriate quality and delay requirements. These results provide insights on network design and fundamental guidelines on establishing an efficient mobile wireless video transmission system.

关键词： Streaming media Delay Mobile ad hoc networks wireless communication Video recording Quality assessment

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