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International Journal of Ad Hoc and Ubiquitous Computing 2013年第3-4期13卷 155-157页

作者： Yang, Zhen Huang, Yueh-Min Rodrigues, Joel Zhou, Liang Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing China Department of Engineering Science National Cheng-Kung University Tainan City Taiwan Instituto de Telecomunicacões University of Beira Interior Rua Marques D'Avila e Bolama 6201-001 Covilhã Portugal

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Wideband DOA estimation based on block FOCUSS with limited samples

Wideband DOA estimation based on block FOCUSS with limited s...

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IEEE Global Conference on Signal and Information Processing (GlobalSIP)

作者： Jiawei Zhang Nan Hu Ming Bao Xiaodong Li Wei He Lab of Communication Acoustics Chinese Academy of Sciences Beijing China Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei China Key Laboratory of Wireless Sensor Network & Communication Chinese Academy of Sciences Shanghai China

Whittaker-Shannon interpolation formula instead of narrowband filter (NF) is used to interpolate the signal more precisely in wideband direction-of-arrival (DOA) estimation problem when the number of samples is highly limited. A novel algorithm named block FOCal Underdetermined System Solver (BFOCUSS) is proposed to solve this problem. The simulation results validate the superior performance compared with the other algorithms.

关键词： Direction-of-arrival estimation Estimation Wideband Interpolation Vectors Signal reconstruction Arrays

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Modeling and analysis of anti-worm in P2P networks

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The Journal of China Universities of Posts and Telecommunications 2012年第1期19卷 112-118页

作者： TANG Xin WANG Ru-chuan SHAO Xing 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 Key Lab of Broadband Wireless Communication and Sensor Network Technology N anjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

Anti-worm is an effective way to fight against malicious worm and has been followed closely by malicious worm researchers recently. However, active and passive confronting technologies in peer-to-peer （P2P） networks have not been studied in depth. This paper introduces both of them to fight against malicious worm in P2P networks. To study their effectiveness in P2P networks, this paper takes the topology degree in P2P networks into consideration and puts forward a four-state propagation model for active anti-worm and a five-state propagation model for passive anti-worm respectively. Both of the models are simplified in the case that size of a P2P network is large enough. The simulation results have not only validated the effectiveness of our propagation models but also evaluated the excellent performance of both active anti-worm and passive anti-worm.

关键词： P2P network anti-worm worm propagation model

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Optimal power allocation and relay selection for cognitive two-way af relaying network

Optimal power allocation and relay selection for cognitive t...

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IET International Conference on Information Science and Control Engineering 2012, ICISCE 2012

作者： Luo, Ronghua Yang, Zhen Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications China

ISBN: (纸本)9781849196413

In an underlay cognitive two-way Amplify-and-Forward (AF) relaying network, secondary users (SUS) and primary user (PU) can share the licensed spectrum simultaneously under the interference threshold constraint. In this paper, the joint power allocation and optimal relay selection scheme is proposed for allocating radio resource on cognitive nodes effectively. For power allocation problem, the objective function is to maximize the achieved minimum Signal to Interference plus Noise Ratio (SINR) at SUS, and the constraints include the total transmit power of cognitive nodes and PU interference threshold, the optimal power allocation algorithm and a simple distributed power allocation algorithm are proposed. Furthermore, based on these results, an optimal two-way relay selection scheme is proposed. Simulation results show that the proposed joint power allocation algorithms and relay selection scheme can achieve excellent system performance.

关键词： Signal to noise ratio

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Super-resolution algorithm through Neighbor embedding with new feature selection and example training

Super-resolution algorithm through Neighbor embedding with n...

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2012 IEEE 11th International Conference on Signal Processing(ICSP 2012)

作者： Mingming Cao Zongliang Gan Xiuchang Zhu Key Lab of "Broadband Wireless Communication and Sensor Network Technology" Ministry of Education College of telecommunication and information engineering Nanjing University of posts and telecommunications

ISBN: (纸本)9781467321969

An improved super-resolution algorithm through neighbor embedding with new feature selection and example training is proposed for single image super resolution reconstruction. Firstly, we take the DCT coefficients as the feature vectors, and then adaptively choose neighbors by k-means clustering algorithm. Finally, we learn the neighborhood relationship between interpolated image from low resolution image and its corresponding high resolution image. The experimental results show that the improved algorithm can not only achieve a better recovery of a single low resolution image comparing with the original neighbor embedding algorithm, but also reduce the computational complexity.

关键词： super-resolution neighbor embedding DCT coefficients K-means clustering

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PERFORMANCE ANALYSIS OF USER FAIR-BASED RELAY ADAPTIVE POWER ALLOCATION IN PHYSICAL-LAYER network CODING COOPERATION

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Journal of Electronics(China) 2012年第5期29卷 383-391页

作者： Cheng Yulun Yang Longxiang Wireless Communications Key Lab of Jiangsu Province Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications

network Coding (NC) is an effective technology to enhance the cooperative system spectral efficiency. However, since it is network-oriented, the existing performance metric of single-user outage can not comprehensively evaluate its gain and the impact to the entire network, which affect the user fairness. This paper proposes two novel user fair-based adaptive relay power allocation algorithms in single-relay NC cooperative multiple access channels. Firstly, common outage probability is employed as the performance metric, and to minimize it, a specific condition is deduced. On this basis, the instantaneous channel information-based adaptive relay power allocation scheme and the channel statistic information-based one with lower complexity are designed respectively, which make users' signals superimposed at accurately calculated proportion to maintain fairness. Simulation results show that compared with other existing schemes, the proposed schemes can best maintain user fairness, and effectively improve the common outage performance of the whole system, at the expense of small spectral efficiency.

关键词： Power allocation Cooperation network Coding (NC) Common outage probability User fairness

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SAE-TOPSIS algorithm for vertical handoff decision in heterogeneous wireless networks

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High technology Letters 2012年第4期18卷 382-386页

作者：刘胜美 Pan Su Mi Zhengkun Broadband Wireless Communication and Sensor Network Technology Key Laboratory of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 P. R. China

An improved technique for order preference by similarity to ideal solution （TOPSIS） algorithm, SAE-TOPSIS, is proposed for the vertical handoff decision in heterogeneous wireless networks. The signal to interference plus noise ratio （SINR） effects, analytic hierarchy process （AHP） and infor- mation entropy （SAE） weight method were introduced into the algorithm. Handoff decision meeting the multi-attribute quality of service （QoS） requirement is made according to an attribute matrix and weight vector using the TOPSIS algorithm. The simulation results have shown that the proposed algo- rithm can provide satisfactory performance fitted to the characteristics of the traffic.

关键词： heterogeneous wireless networks vertical handoff technique for order preferenceby similarity to ideal solution （TOPSIS） analytic hierarchy process （AHP） entropy signal to in-terference plus noise ratio （SINR）

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Novel self-renewal Hash chain based on Ito-Saito-Nishizeki secret sharing scheme

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Journal of China Universities of Posts and Telecommunications 2012年第SUPPL. 2期19卷 122-127页

作者： Dai, Ting Huang, Hai-Ping Wang, Ru-Chuan Pan, Xin-Xing 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 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

Hash chain mechanism has been widely used into a variety of encryption applications and services. The introduction of renewable Hash chain overcomes resource-constrained defect in traditional Hash chains, but many current renewable schemes still hold unsatisfactory performance especially on security and complexity. This paper proposed a novel self-renewable Hash chain construction scheme based on Ito-Saito-Nishizeki secret sharing scheme (SSS). It has proved that the proposed Hash chain scheme has higher security and less consumption of communication, computation and memory than the typical schemes proposed in the existing literatures. © 2012 The Journal of China Universities of Posts and Telecommunications.

关键词： Cryptography

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Hybrid entanglement purification for quantum repeaters

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Physical Review A 2013年第2期88卷 022302-022302页

作者： Yu-Bo Sheng Lan Zhou Gui-Lu Long Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications 210003 Nanjing China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China College of Mathematics and Physics Nanjing University of Posts and Telecommunications Nanjing 210003 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China State Key Laboratory of Low-dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China

We present an entanglement purification protocol (EPP) to reconstruct some maximally hybrid entangled states (HESs) from nonmaximally mixed HESs. We use simple linear optical elements such as a polarization beam splitter (PBS) and beam splitter (BS) to achieve this task. Meanwhile, it is shown that the parity-check gates acted by PBS and BS are enough to complete the task, and the controlled-not (cnot) gates or similar logic operations are not needed. Unlike the current EPPs, this protocol can purify not only the conventional bit-flip error and phase-flip error but also the dissipation error coming from the photon loss of the coherent state. It can also be extended to achieve the purification for multiphoton and multicoherent state HES. This protocol may be useful in current hybrid quantum repeaters.

关键词： Hybrid entanglement purification quantum repeaters Purification Bahamas polarization beam splitter protocols gates

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Improved virtual-force algorithm for 3D underwater wireless sensor networks based on different k-coverage requirements

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Ruan Jian Xue Bao/Journal of Software 2013年第SUPPL.1期24卷 88-97页

作者： Jiang, Xin Huang, Hai-Ping Dai, Xiao-Yan Wang, Ru-Chuan College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

The research of 3D underwater sensors' coverage-control has great significance in rational allocation of underwater space resources, environment-aware & information-acquisition and the network survivability improvement. In the real world situation, the uneven coverage is always needed in the underwater detection region. The current studies focus on the conception of "Event-Driven" without paying enough attention to the diversity of k-coverage requirements of different 3D regions. This work concentrates on the optimizational deployment for Underwater sensor networks' (UWSNs) diverse k-coverage requirements of distinguished regions. Based on the model of "buoys, anchors, underwater sensors which are connected and communicated via a wired cable with their respective buoy", we study the low-boundary number of the sensors required by diversity of k-coverage, and develop a novel algorithm: k-ERVFA (k-Equivalent radius virtual force algorithm) as an improvement to the classic virtual-force algorithm (VFA). Compared with the VFA in our simulation, the new algorithm only loses 1.21%~3.89% of 1-coverage rate in the required 1-coverage region, but significantly improves the 2- and 3- coverage rate to 17.42%~44.3% and 28.95%~49.53% respectively in the corresponding required coverage regions. The improvement in k-coverage requirements illustrates the correctness and effectiveness of k-ERVFA. © 2013 ISCAS.

关键词： wireless sensor networks

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