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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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Research on heart sound identification technology

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Science China(Information Sciences) 2012年第2期55卷 281-292页

作者： CHENG XieFeng1,3,MA Yong2,LIU Chen1,ZHANG XueJun1 & GUO YuFeng11School of Electronic Science and Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China 2School of Computer Science and technology,Nanjing University of Science and technology,Nanjing 210094,China 3key lab of Broudbard wireless communication and sensor network technology(Nanjing University of Posts and Telecommunications),Ministry of Education,Nanjing 210094,China 1. School of Electronic Science and Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China3. Ministry of Education Key Lab of Broudbard Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Nanjing 210094 China2. School of Computer Science and Technology Nanjing University of Science and Technology Nanjing 210094 China

In this article,both the basic principles and the experimental methods of identity recognition technology based on heart sounds are ***,the characteristics of heart sounds and the feasibility of heart sounds as a biometric were analyzed.A synthetic model of heart sounds was then developed based on a family of wavelets;Finally,the characteristic parameters of heart sounds were extracted by using the heart sounds linear band frequency cepstra(HS-LBFC)with a specified configuration,and the similarity distance was adopted for heart sound *** highlight the difference in two heart sound signals between the time and frequency domains,a construction method of the heart sound wavelet,a calculation method of the parameters of a synthetic model,selection of the characteristic parameters of heart sounds and the corresponding data processing technology were *** experimental results showed that the proposed method exhibited excellent performance and practicability.

关键词： biometric wavelet family of heart sounds synthetic model of heart sounds heart sounds linear band frequency cepstra(HS-LBFC)

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Genetic algorithm based coding aware routing for wireless mesh networks

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Advances in Information Sciences and Service Sciences 2012年第5期4卷 235-243页

作者： Shao, Xing Wang, Ruchuan Xu, He Huang, Haiping Sun, Lijuan College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China College of Computer Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing 210003 China

network coding has been confirmed as a potential technology to improve performance of wireless mesh networks (WMNs) and a few network coding aware routings have been proposed. However, these mechanisms detect coding opportunities through local traffic pattern checking, which hardly obtains optimal routes. This paper proposes a Genetic algorithm based Coding Aware Routing (GCAR) for wireless mesh networks, which employs genetic algorithm to optimize routes and coding opportunities. In addition, the key ingredients in GCAR, e.g., chromosome representation, genetic operation of crossover and mutation, fitness function considering coding opportunity and interference, are carefully designed. Through simulations on a randomly generated wireless mesh network, GCAR is shown to find optimal routes within a short time, and achieve more improvements than the previously proposed methods on route setup time, throughput and load balancing.

关键词： Genetic algorithms

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Detecting Encrypted Botnet Traffic Using Spatial-Temporal Correlation

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China communications 2012年第10期9卷 49-59页

作者： Chen Wei Yu Le Yang Geng College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 P. R. China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 P. R. China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing210003 P. R. China

In this paper, we to detect encrypted botnet propose a novel method traffic. During the traffic preprocessing stage, the proposed payload extraction method can identify a large amount of encrypted applications traffic. It can filter out a large amount of non-malicious traffic, greatly in, roving the detection efficiency. A Sequential Probability Ratio Test （SPRT）-based method can find spatialtemporal correlations in suspicious botnet traffic and make an accurate judgment. Experimental resuks show that the false positive and false nega- tive rates can be controlled within a certain range.

关键词： botnet encrypted traffic spatial-tenmporal correlation

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(t, n) secret sharing scheme based on cylinder model in wireless sensor networks

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Journal of networks 2012年第7期7卷 1009-1016页

作者： Huang, Haiping Chen, Hao Wang, Ruchuan Mao, Qian Cheng, Renyuan Nanjing University of Posts and Telecommunications Department of Computer Nanjing University of Aeronautics and Astronautics Department of Computer Science and Technology Nanjing China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Ministry of Education/Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing China

Since the existence of characteristics of heterogeneity, limited energy, complexity and so forth, it turns into a research hot spot on the security mechanism of wireless sensor networks (WSN), especially the problems on the key management. On regard of the deficiency of extant secret sharing schemes, we develop a (t, n) threshold secret sharing scheme which is based on the cylinder model, including the procedures of master-key reconfiguration and sub-key updating. This scheme enables several nodes to be responsible for the security of key together, and by the mean time, we introduce a monitoring mechanism to improve the capability of anti-capturing. With the security theoretical analysis and the comparison with the performance on BPCGR, GKD simulation experiment, it reveals that our scheme satisfies the security requirement of key management in wireless sensor networks, and can effectively reduce the cost on communication and computation. © 2012 ACADEMY PUBLISHER.

关键词： wireless sensor networks

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A novel channel estimation method for clipped OFDM systems based on virtual pilots

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Journal of Computational Information Systems 2012年第5期8卷 1905-1912页

作者： Xie, Yongsheng Zhou, Leilei Fu, Yaoxian Key Lab. of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information Technology CAS Shanghai 200050 China

Data as well as pilot symbols are nonlinearly distorted due to signal clipping in practical OFDM systems. The distortion inflicted on pilot symbols has great negative effect on the channel estimation. To solve this issue, a novel iterative channel estimation algorithm based on virtual pilots is introduced for clipped OFDM systems in this paper. The algorithm iteratively estimates nonlinear distortion of data symbols, and subsequently uses it for data detection. Then part or all of the detected data symbols are used as virtual pilots to perform more precise channel re-estimation. The MSE of channel estimation is derived theoretically. Simulation results show that the proposal improves the performance remarkably with moderate complexity increase at the receiver. In particular, compared to traditional algorithm, the BER performance of this method increases by 0.3 dB. © 2012 Binary Information Press.

关键词： Peak to average power ratio

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Single-channel Speech Separation by l0 Optimization Using Quasi-KLT Bases

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电子学报(英文版) 2012年第3期21卷 535-540页

作者： GUO Haiyan YANG Zhen ZHU Weiping YE Lei College of Engineering Nanjing Agricultural University Nanjing 210031 China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology (Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

This paper deals with single-channel speech separation. First, it is proved that when the sparse bases of the signal sources satisfy certain conditions, all the sources can be perfectly separated from a single mixture by l0 optimization. Then, a special case where the single mixture is generated by two independent speech sources is studied in more detail. It is revealed that the ideal quasi- KLT bases constructed from the original sources satisfy the sufficient conditions for perfect separation of mixed signals. Considering the fact that the ideal quasi-KLT bases cannot be obtained in practice, template-matching based quasi- KLT bases generated from the single mixture are also pro- posed to perform single-channel speech separation. Finally, simulation results demonstrating the effective performance of single-channel separation of two speech sources by l0op- timization using the template-matching based quasi-KLT bases are presented.

关键词：语音分离 KLT 优化单通道模板匹配混合物充分条件信号分离

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Dynamical QoS self-configuration approach of cognitive networks based on end-link cooperation policy

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Journal of Computational Information Systems 2012年第11期8卷 4685-4693页

作者： Qi, Jin Zhang, Shunyi Sun, Yanfei Key Lab. of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China Institute of Information and Network Technology Nanjing University of Posts and Telecommunication Nanjing 210003 China

To solve the problem of rapid QoS declining under network situation as well as improve the judging and dynamical adjusting ability that network system towards user QoS, in this paper, we proposed a dynamical self-configuration approach for guaranteeing QoS in cognitive networks (CNs). Through utilizing the active property of CNs while introducing end-link cooperation policy based on decisionmaking, the user priority has been determined and dynamically corrected. The simulation result represents that the proposed approach has better performance than traditional best of effort service, enabling to guarantee the user QoS under congestion status effectively. © 2012 Binary Information Press.

关键词： Quality of service

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Cognitive networks multi-constraint QoS routing algorithm based on autonomic ant colony algorithm

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Journal of Computational Information Systems 2012年第8期8卷 3429-3436页

作者： Qi, Jin Zhang, Shunyi Sun, Yanfei Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China Institute of Information and Network Technology Nanjing University of Posts and Telecommunication Nanjing 210003 China

This paper focused on the study of cognitive networks (CNs) oriented multi-parameter constraint Quality of Service (QoS) routing optimization. With the foundation of CNs multi-parameter QoS routing requirement, referring to the shortcomings of basic ant colony algorithm, we brought improvements to the four aspects of pheromone initialization, pheromone evaporation factor adjustment, pheromone update method and state transition rules, proposed the CNs multi-constraint QoS routing algorithm based on autonomic ant colony (AAC) algorithm. The simulation result represents that the proposed algorithm has relatively good optimization ability and fast convergence speed, can effectively solving the multi-constraint QoS routing problem faced by CNs. © 2012 Binary Information Press.

关键词： Cost functions

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Wavelet Transform-Based Distributed Compressed Sensing in wireless sensor networks

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China communications 2012年第2期9卷 1-12页

作者： Hu Haifeng Yang Zhen Bao Jianmin Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications Nanjing 210003 P. R. China National Mobile Communications Research Laboratory Southeast University Nanjing 210096 P. R. China

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 *** this paper,we present a Distributed Wavelet Basis Generation(DWBG) algorithm performing at the sink to obtain the distributed wavelet basis in *** on this basis,a Wavelet Transform-based Distributed Compressed Sensing(WTDCS) algorithm is proposed to compress and reconstruct the sensed data with spatial ***,we make a detailed analysis of relationship between reconstruction performance and WTDCS algorithm parameters such as the compression ratio,the channel Signal-to-Noise Ratio(SNR),the observation noise power and the correlation decay parameter by *** simulation results show that WTDCS can achieve high performance in terms of energy and reconstruction accuracy,as compared to the conventional distributed wavelet transform algorithm.

关键词： WSN distributed compressed sensing distributed wavelet transform

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