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2011 International Conference on Information technology, Computer Engineering and Management Sciences, ICM 2011

作者： Zhang, Deng-Yin Cui, Lei Tong, Zhen-Yan Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

ISBN: (纸本)9780769545226

For some existing handoff control algorithms in Aerospace Information network, the success rate of their handoff calls is not high. This paper proposes a handoff control algorithm based on service priorities and channel reservation. The services are divided into different priorities, and reserve different number of channels for different businesses according to their priorities. Besides, the algorithm allows the emergency services to seize the channel resources. Simulation results show that when comparing with the traditional handoff algorithms, the algorithm we proposed can reduce the handoff failure rate. And ensure the handoff performance of emergency users. © 2011 IEEE.

关键词： Emergency services

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Performance Analysis for Intrusion Target Detection in wireless sensor networks

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电子学报(英文版) 2011年第4期20卷 725-729页

作者： FAN Gaojuan WANG Ruchuan HUANG Haiping SUN Lijuan XIAO Fu College of Computer Nanjing University of Posts and Telecommunications Nanjing Chin School of Computer and Information Engineering Henan University Kaifeng China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education of Jiangsu Province Nanjing China

Target detection and field surveillance are among the most prominent applications of wireless sensor networks. The quality of detection achieved by a sensor network can be quantified by evaluating the probability of detecting a mobile target crossing a sensing field. Detection probability of sensor nodes has been studied in sensor networks for many purposes such as quality of service and decision making. However, the sensing capabilities of sensors are affected by environmental factors in real deployment. This paper investigates the problem of detecting probability in a log-normal shadow fading environment. It presents an analytic method to evaluate the detection probability by at least k sensors under practical considerations. Furthermore, we also shows that shadow fading makes significant influence in detection probability compared to unit disk sensing model through extensive simulation experiments.

关键词：无线传感器网络目标检测性能分析入侵检测概率环境因素阴影衰落传感器节点

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Resource allocation algorithm for uplink OFDMA-based cognitive radio systems

Resource allocation algorithm for uplink OFDMA-based cogniti...

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2011 IEEE 3rd International Conference on communication Software and networks, ICCSN 2011

作者： Wang, Yanping Yang, Longxiang Liu, Xu Jiangsu Key Lab of Wireless Communications Nanjing University of Posts and Telecommunications Nanjing China Key Lab of Broadband Wireless Communications and Sensor Network Technology Nanjing China

ISBN: (纸本)9781612844855

This context addresses the subcarrier and power allocation problem in the uplink of an OFDMA system under the cognitive radio environment. The objective is to maximize the sum transmission rate of secondary users, without causing adverse interference to the primary users. We formulate the optimization problem subject to the individual power constraints and the interference constraints. We also propose two suboptimal power loading algorithms that are less complex and a new subcarrier allocation algorithm. The performance of the optimal scheme is compared with the performance of the suboptimal. Simulation results show that the optimal algorithm significantly improves the sum transmission rate, and provides good convergence. © 2011 IEEE.

关键词： Cognitive radio

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A camera self-calibration method based on dual constraints of multi-view images

A camera self-calibration method based on dual constraints o...

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2011 International Conference on wireless communications and Signal Processing, WCSP 2011

作者： Liu, Feng Han, Weiwei Xu, Qiong Lin, Qiongjie Fan, Jingjing Image Processing and Image Communication Jiangsu Key Laboratory Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781457710100

Camera calibration is the essential step of obtaining 3D information from 2D views in the field of computer vision, which is widely used in the area of 3D reconstruction, navigation, visual supervision, etc. A camera self-calibration method based on dual constraints of multi-view images is proposed to make calibration possible when there is no reference calibration block or the movement of camera is arbitrary. In this method, multi-view images are preprocessed first to select three images which are most suitable for camera self-calibration, then we use the method based on the genetic algorithm, the camera parameters are finally estimated by using epipolar geometry matching error and reprojection error as fitness functions as two steps. Experimental results show that the proposed camera self-calibration method is correct and effective. © 2011 IEEE.

关键词： Genetic algorithms

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Joint design of physical layer network coding and channel decoding based on trellis coded modulation in two-way relay channel

Joint design of physical layer network coding and channel de...

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2011 International Conference on wireless communications and Signal Processing, WCSP 2011

作者： Chen, Zhi-Cheng Zheng, Bao-Yu Ji, Xiao-Dong Zhang, Wei-Liang Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing 210003 China

ISBN: (纸本)9781457710100

In this paper we consider a two-way relaying system, where two users A and B wish to exchange information with the help of a common relay R., To decode the superimposed signal from A and B efficiently, we propose a new scheme of jointing physical layer network coding (PNC) and channel decoding for multiple-access channel based on trellis coded modulation (TCM). Since TCM combines channel coding with modulation, the scheme improves the free distance of the coding sequence, thus more encoding gain is achieved. In addition, taking advantage of the linearity of convolutional code and MAC-XOR NC code, the digital bits of network coding are estimated directly. In a word, we propose a novel scheme which considers channel coding, modulation and PNC at the same time, so that not only the information transmission rate is increased, but also the reliability is improved. © 2011 IEEE.

关键词： Channel coding

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An Energy-Efficient Distributed Compressed Sensing Architecture for wireless sensor networks Based on a Distributed Wavelet Compression Algorithm

An Energy-Efficient Distributed Compressed Sensing Architect...

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2011年无线通信与信号处理国际会议(WCSP 2011)

作者： Hai-feng HU Zhen YANG Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Na Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNan

wireless sensor networks (WSN) are mainly characterized by a potentially large number of distributed sensor nodes which collectively transmit information about sensed events to the sink. In this paper, we present a centralized generating algorithm running at the sink to obtain the distributed wavelet basis in WSN. And on this basis, Wavelet Transform-based Distributed Compressed Sensing (WTDCS) algorithm is proposed to compress and reconstruct sensor observations with spatial correlations. Finally, the analysis of relationship between reconstruction error and energy consumption in WTDCS is carried out by simulation. The results show that WTDCS can achieve high performance in terms of energy and reconstruction accuracy, as compared to conventional distributed wavelet transform algorithm.

关键词： WSN Distributed Compressed Sensing Distributed Wavelet Transform

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Detecting Selective Forwarding attacks in WSNs using Watermark

Detecting Selective Forwarding attacks in WSNs using Waterma...

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2011年无线通信与信号处理国际会议(WCSP 2011)

作者： Deng-yin ZHANG Lin Siyuan Chao Xu Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Po Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Pos

-This paper studies the selective forwarding attacks in wireless sensor networks (WSNs) and proposes a method to detect selective forwarding attacks based on digital watermarking technology. This method embeds watermark into the source data packets, which will be extracted at the base station (BS). The BS will judge whether there are malicious nodes in the transmission path by analyzing the packet loss rate from received data. Simulation results show that this method can effectively detect whether malicious nodes have discarded or tampered the contents of the packets.

关键词： Selective forwarding attacks Digital watermarking WSNs GPSR

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Research on image compression and transmission mechanism for wireless multimedia sensor networks

Research on image compression and transmission mechanism for...

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2nd Annual Conference on Electrical and Control Engineering, ICECE 2011

作者： Xiao, Fu Zhang, Pan Sun, Li-Juan Wang, Jing Wang, Ru-Chuan College of Computer Nanjing University of Posts and Telecommunications Nanjing China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing China

ISBN: (纸本)9781424481637

A image compression and adaptive smoothing transmission mechanism for wireless multimedia sensor networks. Goal of our work is to minimize image distortion with the multimedia sensor network conditions varying constantly. Method which uses Set Partitioning in Hierarchical Trees (SPIHT) algorithm based on lifting wavelets for real-time images compression is first presented, and then a framework for realtime image delivery self-adapting over a TCP-friendly connection is depicted. In the context of this scheme, an adaptive smoothing algorithm is also developed based on the predicted available bandwidth to stream real-time image over the TCP-friendly rate control (TFRC) Protocol. Through simulation experiments, it has been shown that this adaptive algorithm performs for a wide-range of the bandwidth scenarios, and a smooth TCP-friendly real-time image transfer for wireless multimedia sensor networks can be accomplished by this proposed scheme. © 2011 IEEE.

关键词： Image compression

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A multi-path transmission algorithm for Layered scalable coding

A multi-path transmission algorithm for Layered scalable cod...

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2011年无线通信与信号处理国际会议(WCSP 2011)

作者： Lin Siyuan Deng-yin ZHANG Jun Wen Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Pos Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Po

wireless Multimedia sensor network (WMSN) need to transfer large amounts of video streaming data, how to achieve efficient and reliable transmission becomes a research hotspot. Layered scalable coding techniques can reduce the amount of data to improve channel efficiency. The multi-path transmission technology can balance the network load to fully utilize network resources. This paper presents a multi-path transmission algorithm for Layered scalable coding. First, the source node divides the video source sequence into base layer and enhancement layers through scalable video coding. Second, the energy delay gradient and delay gradient are set up for each sensor node. Last, multiple paths with different service quality are set up according to node gradient, so that it can adapt to the transmission needs of different stream layers. Simulation results show that the algorithm has good bandwidth adaptation and can better meet the business requirements of different users.

关键词： wireless Multimedia sensor network layered scalable coding multipath transmission

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Interdependency measure and analysis for cross-layer design in WLAN

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International Journal of Advancements in Computing technology 2011年第11期3卷 238-245页

作者： Chen, Rui Wang, Wennai Mi, Zhengkun Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications China School of Communications engineering Nanjing Institute of Technology China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications China

Interdependency among system parameters may significantly affect the cross-layer design and optimization performance of wireless networks. However, it is very difficult to derive the interdependency among system parameters in a dynamic complex networking system due to the uncertainty of data observation and system modeling. In this research, we propose a new approach for dynamic interdependency measure among system parameters by using non-additive measure theory. In particular, the Choquet integral model is applied to distinguish the interaction among system parameters towards the objective function through a set of non-additive measures. Then the most significant effect subset of system parameters on the performance metrics of interest for system objective function is identified. The simulations show that it is only need to adjust the parameters in the optimized subset according to the interdependency measure can improved the network throughput, consequently, the radio resource is utilized more reasonably.

关键词： Uncertainty analysis

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