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Genetic algorithm based coding aware routing for wireless mesh networks

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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Energy efficient subchannel pairing for buffer-aided multi-relay MIMO-OFDM networks

Energy efficient subchannel pairing for buffer-aided multi-r...

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International Conference on wireless communications and Signal Processing (WCSP)

作者： Shuang Yang Yueming Cai Junquan Hu Wendong Yang Lei Wang Weiwei Yang College of Communications Engineering PLA University of Science and Technology Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education

ISBN: (纸本)9781467376884

In this paper, we consider the buffer-aided multi-relay MIMO-OFDM networks and propose a joint space-time-frequency subchannel pairing scheme, in which subchannels of the source to relay links and relay to the destination links are paired in time, frequency, and space domain (TPFPSP) simultaneously. TPFPSP scheme can increase the equivalent channel gains between source and destination. We derive new expressions for the energy efficiency, the system capacity and the outage probability to examine the performance of TPFPSP scheme. Our analytical and numerical results outline that this TPFPSP scheme brings higher capacity, energy efficiency and better outage probability performance to our system. This work reported here provides detailed insights into the design of new subchannel pairing scheme, which achieves full diversity in space, time and frequency domains.

关键词： Relays MIMO Fading OFDM Eigenvalues and eigenfunctions Energy efficiency wireless communication

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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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Channel measurement and modeling for the 15-GHz radio band in an indoor corridor environment

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Journal of communications and Information networks 2017年第2期1卷 102-108页

作者： Hui Xu Wuxiong Zhang Yang Yang Key Lab of Wireless Sensor Network and Communication Chinese Academy of Sciences Shanghai China Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China Shanghai Research Center for Wireless Communications Shanghai China

Traditional mobile communication systems mainly work on the licensed frequency band near or below 3 GHz; however, this band is becoming increasingly crowded. On the other hand, there are abundant unlicensed spectrum resources in higher frequency bands, e.g., 6 GHz, 15 GHz, and 28 GHz, and if those bands are applied, the current spectrum shortage problem could be effectively alleviated. However, the wireless channel characteristics and models are important but still unknown, and thus in this study, extensive measurements and modeling have been conducted to study the characteristics of the high-frequency 15-GHz band. Specifically, a PN(Pseudo Noise) sequence based time-domain measurement system was built and applied to measure the propagation characteristics of the LOS (Line-of-Sight) and NLOS (Non-Line-of-Sight) scenarios in an indoor corridor at 15 GHz. Then, in-depth analysis and modeling on the large-scale characteristics of wireless channels, the relationship between distance and path loss, the path loss exponent, and the shadow fading standard variance are provided. Moreover, the relationship between received power and different elevation angles was studied. In the measurement, two 25-dBi horn antennas with a 10 half-power beam width are used to change elevation angles in the transmitting terminal and azimuth angles in the receiving terminal for all measurement points. The findings and results in this work will serve as a reference and basis for future theoretical studies of the 15-GHz band.

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Evaluation for IPTV service based on poor-quality model

Evaluation for IPTV service based on poor-quality model

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International Symposium on wireless Personal Multimedia communications (WPMC)

作者： Rui Li Zhifeng Wu Ruochen Huang Xin Wei Yi Qian ZTE CORPORATION China Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education China

ISBN: (纸本)9781509053773

This paper proposes an integrated poor-quality model to find the potential relationship between elected STB (set-top boxes) indicators and network conditions. The target is to make the IPTV network fault diagnosis more accurately and efficiently, especially for the sudden pause or blurred screen. The integrated poor-quality model consists of indicator, record and user model. Firstly, the poor-quality indicator model is in charge of selecting the effective indexes from candidate STB indicators. From the result of experiment, we conclude that jitter, abend-number and MLR (media loss rate) are the most important QoS (Quality of Service) parameters in our scenario. Secondly, the poor-quality record model has responsibility for adjustment of threshold values in order to meet the needs of higher accuracy rate with lower misjudgment ratio. Finally, the poor-quality user model takes customer's viewing time parameter into account, which can reflect end user's quality of experience objectively.

关键词： IPTV Quality of service Correlation Jitter Indexes Multimedia communication

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Virtual network embedding by node-splitting

Virtual network embedding by node-splitting

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2013 15th IEEE International Conference on communication technology

作者： Jiandong Huang Qian Wu Yu Liu Bing Wang Wennai Wang Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education College of Telecommunication & Information Engineering Nanjing University of Posts and Telecommunications

network virtualization,as a fundamental technology of Future Internet Architecture,has been used to overcome the ossification of the current *** paper focuses on virtual nodes splitting for aggregating the diverse physical resources in the issue of virtual network embedding(VNE),which is used for the resource allocation in network virtualization.A mixed integer programming(MIP) problem has been proposed by taking both path-splitting and node-splitting into *** feasibility of virtual node splitting is analyzed and a corresponding formal expression is *** VNE performance is evaluated using by a generic MIP solver over a NSFNET *** numerical evaluations in this paper show that,comparing with the approaches for VNE without node-splitting,the proposed algorithm is beneficial to reduce VNE cost,as well as to increase VN acceptance ratio.

关键词： network virtualization Virtual network mapping Node splitting Performance simulation Acceptance ratio

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Practical quantum key distributions with single-photon-added coherent sources

Practical quantum key distributions with single-photon-added...

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第十六届全国量子光学学术报告会

作者： Dong Wang Zheng-Fu Han Guang-Can Guo Feng Zhu Qin Wang Key Lab of Quantum Information University of Science and Technology of ChinaCAS Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsMinistry of Education

We propose new schemes on implementing the single-photon-added coherent source in the quantum key *** apply the source in either the standard BB84 protocol or the new proposed measurement-device-independent quantum ke... 详细信息

关键词： Practical quantum key distributions with single-photon-added coherent sources

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Trustworthy web services discovery via supervised services representation and collaborative QoS prediction

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Journal of Computational Information Systems 2012年第21期8卷 8835-8846页

作者： Chen, Lei Yang, Geng Zhang, Yingzhou Wang, Tao Mou, Bolin College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China

With the exponential growth of web services, the researches on how to accurately find the trustworthy services become increasingly important. Currently, some researchers have utilized the idea of services classification to minimize the services discovery duration, but seldom employed category label information to further improve services representation. In addition, the existing researches always assume that the nonfunctional QoS characteristics are known, which is actually impossible in reality. In this paper, in order to address these problems, we present a trustworthy web services discovery framework named *** with the existing approaches, the TWSDisC has the two advantages. First, by using the prior category label information, the TWSDisC imports the supervised Inverse Category Frequency term weighting scheme to facilitate services representation. Second, the TWSDisC adopts the state-of-the-art matrix completion technique to predict the missing QoS values and correct the corrupted ones. Experimental results performed on the real-world web services collection demonstrate the feasibility of the proposed approaches. © 2012 Binary Information Press.

关键词： Websites

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Experimental verification of steerability via geometric Bell-like inequalities

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Physical Review A 2018年第3期97卷 032107-032107页

作者： Jian Li Cen-Yang Wang Tong-Jun Liu Qin Wang Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

Quantum steering is one form of quantum correlations interpolating between entanglement and Bell nonlocality, which in some cases can be detected by various steering inequalities. Recently, a remarkable and useful steerability criterion via geometric Bell-like inequalities was established [M. Zukowski, A. Dutta, and Z. Yin, Phys. Rev. A 91, 032107 (2015)]. We report an experimental investigation of this steering criterion and verify the geometric Bell-like steering inequality experimentally by using of the Werner states. The results demonstrate that the geometric Bell-like steering inequality is a convenient tool to detect quantum steering both theoretically and practically.

关键词： Quantum correlations in quantum information

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A DISTRIBUTED COMPRESSED SENSING APPROACH FOR SPEECH SIGNAL DENOISING

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Journal of Electronics(China) 2011年第4期28卷 509-517页

作者： Ji Yunyun Yang Zhen College of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts ＆ Telecommunications Nanjing 210003 China

Compressed sensing,a new area of signal processing rising in recent years,seeks to minimize the number of samples that is necessary to be taken from a signal for precise *** precondition of compressed sensing theory is the sparsity of *** this paper,two methods to estimate the sparsity level of the signal are *** then an approach to estimate the sparsity level directly from the noisy signal is ***,a scheme based on distributed compressed sensing for speech signal denoising is described in this work which exploits multiple measurements of the noisy speech signal to construct the block-sparse data and then reconstruct the original speech signal using block-sparse model-based Compressive Sampling Matching Pursuit(CoSaMP) *** simulation results demonstrate the accuracy of the estimated sparsity level and that this de-noising system for noisy speech signals can achieve favorable performance especially when speech signals suffer severe noise.

关键词： Distributed compressed sensing Sparsity estimation Speech signal Denoising

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