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Conference on Lasers and Electro-Optics (CLEO)

作者： Peng Li Aimin Wang Xi Wang Zhigang Zhang Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing China

We demonstrate 330 MHz repetition rate operation in a ring cavity Yb:fiber laser with novel and compact devices. The spectral bandwidth of the pulse is 30 nm and the dechirped pulse width is 48 fs.

ISBN: (纸本)9781557529107

We demonstrate 330 MHz repetition rate operation in a ring cavity Yb:fiber laser with novel and compact devices. The spectral bandwidth of the pulse is 30 nm and the dechirped pulse width is 48 fs.

关键词： Cavity resonators Optical fiber polarization Gratings Pump lasers Fiber lasers Laser theory

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Entanglement Dynamics in Multipartite systems with Asymmetrical Couplings

Entanglement Dynamics in Multipartite systems with Asymmetri...

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全国光电子与量子电子学技术大会

作者：周江郭弘 CREAM Group State Key Laboratory of Advanced Optical Communication Systems and Networks and Institute of Quantum Electronics School of Electronics Engineering and Computer Science Peking University

Recently, people begin to analyze the dynamics of an extended system which incorporates two qubits and their respective reservoirs and successfully explain the process of information transmission in Markovian regime [1, 2]. Inspired by their notable results, we study the entanglement dynamics of the composite system via a nonperturbative method [3] with both symmetrical and asymmetrical atom-reservoir couplings. We find that with the introduction of asymmetry, the quantitative criteria for the birth and death phenomena in both Markovian [1] and non-Markovian regime lose their validity. Besides, we investigate an interesting issue that the composite system is composed of a Markovian subsystem and a non-Markovian one.

关键词： Entanglement Dynamics in Multipartite systems with Asymmetrical Couplings

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Performance analysis of the affine projection CM algorithm

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Journal of Information and Computational science 2011年第14期8卷 3275-3280页

作者： Ma, Lili Chen, Jinguang Wang, Huiran School of Computer Science Xi'an Polytechnic University Xi'an 710048 China School of Electronic Engineering Xidian University Xi'an 710071 China Science and Technology on Information Transmission and Dissemination in Communication Networks Lab. Shijiazhuang 050081 China

In this paper, we discuss the performance of the affine projection CM algorithm, which can deal with the cases that the input signals are correlated and decrease the filtering error. We describe the derivation of algorithm process and analysis the error performance and computational complexity. And an example of adaptive blind equalization is given to verify this algorithm. Some conclusions are obtained which are benefit to the researchers and engineers in the adaptive filtering field. 1548-7741/Copyright © 2011 Binary Information Press December 2011.

关键词： Adaptive filters

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Sub-40 fs Er:Fiber laser

Sub-40 fs Er:Fiber laser

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Conference on Lasers and Electro-Optics (CLEO)

作者： Zhigang Zhang Weijian Zong Chen Li Ding Ma Chun Zhou Aimin Wang Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Beijing Normal University Beijing China

Simulation and experiment results are presented for sub-40 fs pulse generation in Er:fiber ring lasers.

ISBN: (纸本)9781557529107

Simulation and experiment results are presented for sub-40 fs pulse generation in Er:fiber ring lasers.

关键词： Optical fiber dispersion Optical fiber polarization Fiber lasers Laser mode locking Optical fiber communication Cavity resonators

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Imperfection Elimination in the Post Processing of True Random Number Generator

Imperfection Elimination in the Post Processing of True Rand...

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全国光电子与量子电子学技术大会

作者：朱洺祎刘钰张建玮郭弘 State Key Laboratory of Advanced Optical Communication Systems and Networks and Institute of Quantum Electronics School of Electronics Engineering and Computer SciencePeking University School of Physics Peking University

We propose a novel way to eliminate the imperfection induced by the noise of experimental equipments and environment in a physical realization of true random number *** operating such post processing on the data,the autocorrelation coefficient and bias contained in the original data are successfully *** entropy of our random sequence is also approaching to the ideal limit and we finally obtain a 150G bps generation rate of random bits.

关键词： Imperfection Elimination in the Post Processing of True Random Number Generator

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A sender-based TFRC for Saratoga: A rate control mechanism for a space-friendly transfer protocol

A sender-based TFRC for Saratoga: A rate control mechanism f...

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IEEE Conference on Aerospace

作者： Abu Zafar M. Shahriar Mohammed Atiquzzaman William D. Ivancic Lloyd Wood Computer Science University of Oklahama Norman OK USA Satellite Networks and Architectures Branch Communication Technology Division NASA Glenn Research Center Cleveland OH USA Centre for Communication Systems Research University of Surrey Guildford UK

Saratoga is a protocol for fast file transfers across dedicated links in private networks, using small amounts of feedback for loss recovery. It is in use to download large amounts of imaging data from remote-sensing satellites, where the link environment is highly asymmetric and up-links are constrained. However, Saratoga lacks a rate-control mechanism to allow fair share with co-existing flows for simultaneous competing transfers, or for across the congested Internet where it must coexist fairly with TCP. TFRC, a self-and TCP-Friendly Rate Control mechanism, can be adopted for Saratoga and leverage its existing protocol information. Use of TFRC normally requires significant changes in protocol operation, including additional data in feedback. We design a sender-based TFRC for Saratoga, needing only simple modifications within the sender and using only existing feedback information. This sender-based TFRC is shown to share the bottleneck-bandwidth fairly under various network conditions, allowing Saratoga to be adapted for shared links or for the congested Internet, while still supporting the asymmetric environments that Saratoga was originally developed for.

关键词： Receivers History Throughput Protocols Satellites Satellite broadcasting Internet

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A network partitioning recovery process in Mobile Ad-Hoc networks

A network partitioning recovery process in Mobile Ad-Hoc Net...

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IEEE International Conference on Wireless and Mobile Computing, Networking And communications (WiMob)

作者： Mikhail Tarasov Jochen Seitz Oleksandr Artemenko Division of Communication Networks Faculty of Electrical Engineering and Information Technology Ilmenau University of Technology Ilmenau Germany Applied Computer Science Department Erfurt University of Applied Sciences Erfurt Germany

Mobile Ad-hoc networks (MANETs) are of significant scientific and practical interest in many areas of human life. MANETs also play a vital role in providing an uninterrupted communication service between members of a rescue team in natural or anthropogenic disasters. One of the most common problems of MANETs is network partitioning. In this situation, the network splits up into several isolated fragments incapable of communicating with each other. Network partitioning can lead to dramatic consequences especially in disaster scenarios. In this paper, we propose a solution for the above mentioned problem, a system which detects and recovers from network partitioning using additional mobile nodes. Besides, the proposed novel system is scalable and robust due to a self-organizing, distributed architecture. Furthermore, it is also energy efficient during its reactive behavior, what is especially important for mobile nodes with limited battery capacity.

关键词： Mobile computing Ad hoc networks Mobile communication IP networks Routing Wireless sensor networks Network topology

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Data traffic differentiation and QoS on the train, in fast parameter varying, heterogeneous wireless networks

Data traffic differentiation and QoS on the train, in fast p...

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IEEE Symposium on communications and Vehicular Technology (SCVT)

作者： Milos Rovcanin Dries Naudts Daan Pareit Erwin Van de Velde Johan Bergs Ingrid Moerman Chris Blondia Department of Information Technology Internet Based Communication Networks and Services Ghent University Gent Belgium PATS Research Group Department Mathematics and Computer Science University of Antwerp Antwerp Belgium

Although Internet on the train and train to wayside communication in general becomes more and more available for train operators, there are still a lot of challenges for future research. We previously developed a network platform that is responsible for an uninterrupted and seamless connectivity from the train to the wayside through heterogeneous wireless access technologies. This paper mainly focuses on the concept for providing sufficient Quality of Service (QoS) guarantees in a dynamic train environment. Within this network platform, IPv6 strategies are adopted for QoS, exploiting multi-homing and intelligent aggregation techniques. The implementation that has been done in the Click Modular Router programming environment will also be presented in details.

关键词： Safety Security Indexes Jitter Delay US Department of Defense

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The QoE provisioning-delivery-hysteresis and its importance for service provisioning in the Future Internet

The QoE provisioning-delivery-hysteresis and its importance ...

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Conference on Next Generation Internet networks, NGI

作者： Tobias Hoßfeld Markus Fiedler Thomas Zinner Julius-Maximilians-Universitat Wurzburg Wurzburg Bayern DE Blekinge Institute of Technology School of Computing Sweden University of Würzburg Institute of Computer Science Chair of Communication Networks Germany

Quality of Experience (QoE) combines non-technical parameters such as user perception, experience and expectations with technical parameters such as application- and network-level Quality of Service (QoS). For service or network providers, it is important to understand the quantitative relationship between QoE and these technical parameters in order to manage the user-perceived quality. This paper investigates the different impacts of a) provisioning and b) delivery problems due to insufficient resources on QoE, leading to the QoE provisioning-delivery hysteresis (QoE-PDH). We demonstrate the QoE-PDH for Voice-over-IP, live video streaming, and web browsing based on existing measurement studies. The results clearly quantify the necessity to control quality, instead of suffering from uncontrollable impacts like packet loss caused by congestion. The implementation and the limitations of the QoE-PDH in the current Internet is shown using the example of Skype. Afterwards we discuss how these results can be used to enhance energy-efficient service provisioning and delivery in the Future Internet.

关键词： Streaming media Codecs Bandwidth Degradation Internet Hysteresis Loss measurement

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Polite water-filling for weighted sum-rate maximization in MIMO B-MAC networks under multiple linear constraints

Polite water-filling for weighted sum-rate maximization in M...

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IEEE International Symposium on Information Theory

作者： An Liu Youjian Liu Vincent K. N. Lau Haige Xiang Wu Luo State Key Laboratory of Advanced Optical Communication Systems & Networks School of EECS Peking University China Department of Electrical and Computer Engineering University of Colorado Boulder USA Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong China

ISBN: (纸本)9781457705960

The algorithms in this paper exploit optimal input structure in interference networks and is a major advance from the state-of-the-art. Optimization under multiple linear constraints is important for interference networks with individual power constraints, per-antenna power constraints, and/or interference constraints as in cognitive radios. While for single-user MIMO channel transmitter optimization, no one uses general purpose optimization algorithms such as steepest ascent because water-filling is optimal and much simpler, this is not true for MIMO multiaccess channels (MAC), broadcast channels (BC), and the non-convex optimization of interference networks because the traditional water-filling is far from optimal for networks. We recently found the right form of water-filling, polite water-filling, for some capacity/achievable regions of the general MIMO interference networks, named B-MAC networks, which include BC, MAC, interference channels, X networks, and most practical wireless networks as special cases. In this paper, we use weighted sum-rate maximization under multiple linear constraints in interference tree networks, a natural extension of MAC and BC, as an example to show how to design highly efficiency and low complexity algorithms. Several times faster convergence speed and orders of magnitude higher accuracy than the state-of-the-art are demonstrated by numerical examples.

关键词： Interference MIMO Covariance matrix Optimization Complexity theory Receivers Algorithm design and analysis

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