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Annual Conference on Wireless On-Demand Network Systems and Services

作者： David Eckhoff Nikoletta Sofra Reinhard German Computer Networks and Communication Systems Dept. of Computer Science University of Erlangen Audi Electronics Venture GmbH

ISBN: (纸本)9781479907472

The idea of wirelessly connected vehicles has long ceased to be a vision as researchers from both academic and industrial institutions and field operational tests all over the world are contributing to bringing this technology to life. Both ETSI and IEEE have been working on respective standards (ETSI ITS G5 in Europe, IEEE WAVE in North America) to enable this new application of wireless communication. In this paper we compare medium access in these systems by means of an extensive simulation study while focusing on the transmission of periodic safety messages on the control channel. We observe that for different reasons high node density scenarios appear to be critical for the overall performance of both systems. This includes end-to-end delay, packet error rates and a non-optimal channel utilization that leaves room for improvement. We find that the approach proposed by ETSI ITS G5 with Decentralized Congestion Control (DCC) may access the channel rather conservatively but still outperforms IEEE WAVE in most of the scenarios.

关键词： European Telecommunications Standards Institute INSTITUTE OF ELECTRICAL AND ELECTRONIC ENGINEERS Safety Information waves waveforms Intelligent transportation systems Intelligent Tutoring Systems Media Access CARRIER SYSTEM

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Dynamics of tripartite geometric quantifiers of correlations in a quantum spin system

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Physical Review A 2013年第6期87卷 062315-062315页

作者： Jiang Zhou Hong Guo State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing 100080 China

We derive an exact formula of geometric measure of quantum discord (GMQD) for an arbitrary 3-qubit state. The dynamics of GMQD in a quantum spin system coupled to a thermal bath is studied by simulation and analytical approximation. It is found that tripartite quantum discord has distinct time behaviors within two different eigenspaces. Further, we extend the square norm distance to define tripartite geometric quantifiers of total and classical correlations. We obtain their explicit expressions and discuss the possibility of having a closed additive relation among various kinds of correlations during the dynamical evolution.

关键词： Spin dynamics

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Dynamic bandwidth allocation&guarantee for virtualized networks in cloud

Dynamic bandwidth allocation&guarantee for virtualized netwo...

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9th International Conference on Information, communications and Signal Processing, ICICS 2013

作者： Luo, Xuan Zhang, Pengfei Ye, Tong Jin, Yaohui Wang, Jianping Network and Information Center Shanghai Jiaotong University China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiaotong University China Department of Computer Science City University of Hong Kong Hong Kong

ISBN: (纸本)9781479904341

Among all SLAs(Service Level Agreements) about network resources in the cloud, a critical problem would be achieving bandwidth guarantee under all communication environment (e.g., when misbehaved VMs exist) while keeping acceptable bandwidth utility and system scalability. In this paper, we present an architecture of dynamic bandwidth allocation and guarantee on resource fairness, to provide network performance isolation and protocol independent bandwidth guarantees. In this paper, we first discuss the business model of bandwidth guarantee for Infrastructure-as-a-Service (IaaS) cloud, and a bandwidth allocation algorithm based on redefined fairness model is proposed and realized under the novel architecture, and finally experiment shows satisfying results under various communication scenarios. © 2013 IEEE.

关键词： Bandwidth

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Pipeline structure Schnorr-Euchner Sphere Decoding Algorithm

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communications and Network 2013年第3期5卷 108-112页

作者： Xinyu Mao Jianjun Wu Haige Xiang State Key Laboratory of Advanced Optical Communication Systems & Networks School of Electronics Engineering and Computer Science Peking University Beijing China

We propose a pipeline structure for Schnorr-Euchner sphere decoding algorithm in this article. It divides the search tree of the original algorithm into blocks and executes the search from block to block. When one block search of a signal is over, the part in the pipeline structure that processes this block search can load another signal and search. Several signals can be processed at the same time in one pipeline. Blocks are arranged to lower the whole complexity in the way that the previously search blocks are the blocks those have more probability to generate the final solution. Simulation experiment results show the average process delay can drop to the range from 48.77% to 60.18% in a 4-by-4 antenna system with 16QAM modulation, or from 30.31% to 61.59% in a 4-by-4 antenna system with 64QAM modulation.

关键词： Multiple-Input Multiple-Output System Schnorr-Euchner Sphere Decoding Pipeline Structure

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Stabilized microwave frequency dissemination based on wavelength-shifted optical feedback

Stabilized microwave frequency dissemination based on wavele...

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Laser science, LS 2013

作者： Yu, Zhonglong Liu, Guanyu Gong, Zibo Lu, Xing Chen, Xing Zhang, Zhigang Shi, Kebin State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing 100871 China State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

We report on stable transfer of microwave frequency over 100km lab fiber at the fractional stability of 1.5×10-13/1s. A new scheme of round-trip phase noise detection based on an extended optical frequency comb i... 详细信息

ISBN: (纸本)9781557529879

关键词： Optical feedback

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ENERGY EFFICIENT DISTRIBUTED STEGANOGRAPHY FOR SECURE communication IN WIRELESS MULTIMEDIA SENSOR networks

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Journal of Electronics(China) 2013年第1期30卷 9-16页

作者： Lin Qiaomin Wang Ruchuan Ye Ning Wang Zhongqin 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 University of Posts and Telecommunications) Ministry of Education Department of Information Science Nanjing College for Population Management

A secure communication mechanism is necessary in the applications of Wireless Multimedia Sensor networks (WMSNs), which is more vulnerable to security attacks due to the presence of multimedia data. Additionally, given the limited technological resources (in term of energy, computation, bandwidth, and storage) of sensor nodes, security and privacy policies have to be combined with energy-aware algorithms and distributed processing of multimedia contents in WMSNs. To solve these problems in this paper, an energy efficient distributed steganography scheme, which combines steganography technique with the concept of distributed computing, is proposed for secure communication in WMSNs. The simulation results show that the proposed method can achieve considerable energy efficiency while assuring the communication security simultaneously.

关键词： Discrete Wavelet Transform （DWT） Distributed steganography Energy efficiency Perfect hash Wireless Multimedia Sensor networks （WMSNs）

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Pipeline structure Schnorr-Euchner Sphere Decoding Algorithm

Pipeline structure Schnorr-Euchner Sphere Decoding Algorithm

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The 9th International Conference on Wireless communications,Networking and Mobile Computing(WICOM 2013)

作者： Xinyu Mao Jianjun Wu Haige Xiang State Key Laboratory of Advanced Optical Communication Systems & Networks School of Electronics Engineering and Computer SciencePeking University

关键词： Multiple-Input Multiple-Output System Schnorr-Euchner Sphere Decoding Pipeline Structure

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Adaptive Routing Based on Bayesian Network and Fuzzy Decision Algorithm in Delay-Tolerant Network

Adaptive Routing Based on Bayesian Network and Fuzzy Decisio...

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IEEE International Conference on High Performance Computing and communications (HPCC)

作者： Jiaojiao Liang Yuebin Bai Chongguang Bi Zhenxi Sun Changjiang Yan Hongquan Liang School of Computer Science and Engineering Beihang University Beijing China Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory Shijiazhuang China

The topology of delay-tolerant network (DTN) changes frequently. The whole network is disconnected and there exists no end-to-end path for messages. We need a kind of mechanism called store-carry-forward to overcome this fault in DTN. However, traditional end-to-end routing protocols do not meet this requirements. Researchers developed many kinds of DTN routing protocols and different routing protocol fits different application characteristics. Because of the variable application characteristics, we should choose suitable routing protocols according to application requirements. For example, if the current traffic is heavy or the size of the message is too big, we should use routing protocols with small copy number, if the transmission is emergent, we should use routing protocols with short delay. This paper proposes the concept of adaptive routing, meaning choosing routing protocols based on application characteristics in DTN. We develop an adaptive routing scheme according to particular requirements, history network information and current network conditions in network scenarios and validate that with adaptive routing scheme the network performances improve a lot in many aspects, such as delay, overhead and delivery through simulations.

关键词： Routing protocols Delays Bayes methods Routing Knowledge based systems Vectors Adaptive systems

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Dynamic HTTP download scheduling with respect to energy consumption

Dynamic HTTP download scheduling with respect to energy cons...

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Tyrrhenian International Workshop on Digital communications - Enhanced Surveillance of Aircraft and Vehicles, TIWDC/ESAV

作者： Andreas Blenk Wolfgang Kellerer Florian Wamser Thomas Zinner Phuoc Tran-Gia Institute for Communication Networks Technische Universität München Germany Institute of Computer Science University of Würzburg Germany

Mobile devices, in particular smartphones, are battery powered. As their small size limits their energy capacity, an intelligent and energy-saving use of resources is crucial for the mobile user experience. Especially energy saving while sending and receiving data becomes important due to the always-on nature of smartphones. One solution for a sophisticated resource usage in wireless access networks is to tailor resource management to applications. The advantage of such mechanisms is to be able to address both the perceived quality of the users and the energy consumption of mobile devices at the same time. We propose several traffic scheduling algorithms for HTTP file download in wireless networks based on this application-aware paradigm. The core idea is to use download scheduling that avoids parallel transmissions and, in contrast, favors sequential *** have implemented and measured the algorithms in a wireless mesh network. The evaluation results quantify the gain of an application-aware resource management with respect to quality of experience and energy consumption.

关键词： Energy consumption Resource management IEEE 802.11 Standards Smart phones Mobile communication Power demand

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Advances in compact high repetition rate Yb:Fiber laser frequency combs

Advances in compact high repetition rate Yb:Fiber laser freq...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Aimin Wang Guizhong Wang Chen Li Tongxiao Jiang Wei Zhang Zhigang Zhang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing China

We present the direct short pulse generation and spectrum broadening with ultra-high repetition rate fiber lasers that ensure the long-term stability of frequency combs.

ISBN: (纸本)9781467364751

We present the direct short pulse generation and spectrum broadening with ultra-high repetition rate fiber lasers that ensure the long-term stability of frequency combs.

关键词： Fiber lasers Laser mode locking Laser theory Silicon compounds Pump lasers Laser excitation

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