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distributed synchronization for OFDMA-Based Wireless Mesh Networks

ETRI JOURNAL 2014年第1期36卷 1-11页

作者： Kim, Jihyung Kim, Jung-Hyun Lim, Kwangjae ETRI Commun & Internet Res Lab Taejon South Korea Yonsei Univ Dept Elect & Elect Engn Seoul 120749 South Korea

In this paper, we propose a distributed synchronization algorithm for wireless mesh networks based on orthogonal frequency division multiple access. For time and frequency synchronization, a node requests its neighbor nodes for a change of fast Fourier transform starting points, transmission times, and carrier frequencies needed for synchronization. The node also updates its own time and frequency elements through simple formulas based on request messages received from neighbor nodes using a guard interval and a cyclic prefix. This process with the cooperation of neighbor nodes leads to a gradual synchronization of all nodes in the network. Through a performance comparison with a conventional scheme, we obtain simulation results indicating that the proposed scheme outperforms the conventional scheme in random topologies and a grid topology.

关键词： Wireless mesh networks distributed synchronization cooperation OFDMA

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distributed synchronization on Weakly Connected Networks

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IEEE COMMUNICATIONS LETTERS 2017年第7期21卷 1577-1580页

作者： Denic, Stojan Georgiou, Orestis Spagnolini, Umberto Toshiba Telecommun Res Lab Bristol BS1 4ND Avon England Politecn Milan Dipartimento Elettron Informaz & Bioingn I-20133 Milan Italy

distributed synchronization for wireless networks is based on the mutual exchange of the same chirp-signature by nodes. Collisions of these signatures drive the system toward time and (carrier) frequency synchronization using distributed consensus algorithms. This letter investigates the convergence and the asymptotic distortion properties on noisy networks when neighboring clusters of nodes are weakly connected to each other only through a subset of nodes and bridging links. These heavily connected clusters act as macroagents, and the consensus properties of the ensemble depend on the number of bridge links between them. The convergence rate and mean square synchronization deviation are derived as functions of the number of bridge links for different examples of weakly connected noisy networks via the analytic calculation of Laplacian spectra. Our approach facilitates the study of network topology optimization for distributed synchronization.

关键词： Algebraic connectivity consensus methods distributed inference distributed synchronization Laplacian spectrum

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distributed synchronization in wireless networks

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IEEE SIGNAL PROCESSING MAGAZINE 2008年第5期25卷 81-97页

作者： Simeone, Osvaldo Spagnolini, Umberto Bar-Ness, Yeheskel Strogatz, Steven H. WisyTech Spinoff Co Politecn Milan Milan Italy

This article has explored history, recent advances, and challenges in distributed synchronization for distributed wireless systems. It is focused on synchronization schemes based on exchange of signals at the physical layer and corresponding baseband processing, wherein analysis and design can be performed using known tools from signal processing. Emphasis has also been given on the synergy between distributed synchronization and distributed estimation/detection problems. Finally, we have touched upon synchronization of nonperiodic (chaotic) signals. Overall, we hope to have conveyed the relevance of the subject and to have provided insight on the open issues and available analytical tools that could inspire further research within the signal processing community.

关键词： radio networks signal processing synchronisation baseband processing distributed detection distributed estimation distributed synchronization nonperiodic signal synchronization signal exchange wireless networks Distribute signal exchange signal processing Radio networks Wireless networks CARRIER SYSTEM

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distributed synchronization Technique for OFDMA-Based Wireless Mesh Networks Using a Bio-Inspired Algorithm

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SENSORS 2015年第8期15卷 18287-18301页

作者： Kim, Mi Jeong Maeng, Sung Joon Cho, Yong Soo Chung Ang Univ Sch Elect & Elect Engn Seoul 156756 South Korea

In this paper, a distributed synchronization technique based on a bio-inspired algorithm is proposed for an orthogonal frequency division multiple access (OFDMA)-based wireless mesh network (WMN) with a time difference of arrival. The proposed time- and frequency-synchronization technique uses only the signals received from the neighbor nodes, by considering the effect of the propagation delay between the nodes. It achieves a fast synchronization with a relatively low computational complexity because it is operated in a distributed manner, not requiring any feedback channel for the compensation of the propagation delays. In addition, a self-organization scheme that can be effectively used to construct 1-hop neighbor nodes is proposed for an OFDMA-based WMN with a large number of nodes. The performance of the proposed technique is evaluated with regard to the convergence property and synchronization success probability using a computer simulation.

关键词： wireless mesh network OFDMA bio-inspired algorithm distributed synchronization time difference of arrival time synchronization frequency synchronization

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distributed synchronization AND REGULARITY

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COMPUTER NETWORKS AND ISDN SYSTEMS 1979年第1期3卷 36-43页

作者： BOCHMANN, GV ECOLE POLYTECH FED LAUSANNE DEPT MATHCH-1007 LAUSANNESWITZERLAND

The communication delays between the different components of a distributed system often create problems for the logical consistency of the overall system behaviour. The ideas presented in this paper suggest to eliminate these problems by observing certain regularity constraints during the system design, which guarantee that the logical behaviour of the system is independent of the communication delays. The paper presents a descriptive model for the specification of distributed systems, and defined system properties which imply regular system behaviour. A sufficient condition for checking the regularity of a given system is given. The application of the concepts presented is illustrated by several examples.

关键词： distributed synchronization communication delays deadlocks mutual exclusion distributed system modules distributed system design regularity constraints synchronization primitives distributed system verification

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distributed synchronization in Networks of Agent Systems With Nonlinearities and Random Switchings

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IEEE TRANSACTIONS ON CYBERNETICS 2013年第1期43卷 358-370页

作者： Tang, Yang Gao, Huijun Zou, Wei Kurths, Juergen Harbin Inst Technol Res Inst Intelligent Control & Syst Harbin 150080 Peoples R China Humboldt Univ Inst Phys D-12489 Berlin Germany Potsdam Inst Climate Impact Res D-14415 Potsdam Germany Huazhong Univ Sci & Technol Sch Math & Stat Wuhan 430074 Peoples R China Humboldt Univ Inst Phys D-10099 Berlin Germany Univ Aberdeen Inst Complex Syst & Math Biol Aberdeen AB24 3UE Scotland

In this paper, the distributed synchronization problem of networks of agent systems with controllers and nonlinearities subject to Bernoulli switchings is investigated. Controllers and adaptive updating laws injected in each vertex of networks depend on the state information of its neighborhood. Three sets of Bernoulli stochastic variables are introduced to describe the occurrence probabilities of distributed adaptive controllers, updating laws and nonlinearities, respectively. By the Lyapunov functions method, we show that the distributed synchronization of networks composed of agent systems with multiple randomly occurring nonlinearities, multiple randomly occurring controllers, and multiple randomly occurring updating laws can be achieved in mean square under certain criteria. The conditions derived in this paper can be solved by semi-definite programming. Moreover, by mathematical analysis, we find that the coupling strength, the probabilities of the Bernoulli stochastic variables, and the form of nonlinearities have great impacts on the convergence speed and the terminal control strength. The synchronization criteria and the observed phenomena are demonstrated by several numerical simulation examples. In addition, the advantage of distributed adaptive controllers over conventional adaptive controllers is illustrated.

关键词： Bernoulli stochastic variables complex dynamical networks distributed synchronization multi-agent systems multiple random nonlinearities multiple random updating laws

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distributed synchronization in large-scale wireless sensor networks using group consensus protocol

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INTERNATIONAL JOURNAL OF distributed SENSOR NETWORKS 2017年第11期13卷 1-1页

作者： Jin, Yanliang Zhang, Xiaoshuai Yao, Bin Shanghai Univ Shanghai Inst Adv Commun & Data Sci Joint Int Res Lab Specialty Fiber Opt & Adv Commu Key Lab Specialty Fiber Opt & Opt Access Networks Room 1211Bldg Xingjian149Yanchang Rd Shanghai 200444 Peoples R China

This article analyzes the clock model of sensor nodes and the basic principle of time synchronization. Then, it systematically introduces the existing time synchronization mechanisms and compares their advantages and disadvantages. In order to solve the problems of consensus-based time synchronization, such as propagation delay and convergence speed, Group Consensus Time synchronization algorithm is proposed. In this protocol, minimum data exchange is achieved for both frequency and phase offset compensation, and at the same time, the propagation delay is considered and compensated for. The simulation results show that the protocol can adapt to dynamic topology and be suitable to large-scale wireless sensor networks.

关键词： distributed synchronization group consensus large scale wireless sensor network dynamic topology

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distributed synchronization of autonomous underwater vehicles with memorized protocol

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INTERNATIONAL JOURNAL OF ADVANCED ROBOTIC SYSTEMS 2019年第2期16卷 3426页

作者： Ma, Chao Wu, Wei Univ Sci & Technol Beijing Sch Automat & Elect Engn Beijing Peoples R China Chinese Acad Sci State Key Lab Management & Control Complex Syst Inst Automat 95 Zhongguancun East Rd Beijing 100190 Peoples R China

This article investigates the distributed synchronization problem of autonomous underwater vehicles by developing a novel synchronization protocol with memorized controller. More precisely, the memory information for information exchanges of autonomous underwater vehicles is utilized such that the synchronization performance can be improved. By employing the Lyapunov-Krasovskii functional method with model transformation, sufficient criteria are established for guaranteeing the synchronization, and the corresponding distributed synchronization controllers are designed based on matrix techniques. Finally, the effectiveness and benefits of our theoretical method are supported by an illustrative example with simulation results.

关键词： Autonomous underwater vehicles sampled-data control distributed synchronization memorized protocol Lyapunov-Krasovskii functional method

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distributed synchronization of Stochastic Complex Networks with Time-Varying Delays via Randomly Occurring Control

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Applied Mathematics 2021年第9期12卷 803-817页

作者： Xiaoyan Liu Xiuliang Qiu Chengyi University College Jimei University Xiamen China

This paper studies the distributed synchronization control problem of a class of stochastic dynamical systems with time-varying delays and random noise via randomly occurring control. The activation of the distributed adaptive controller and the update of the control gain designed in this paper all happen randomly. Based on the Lyapunov stability theory, LaSalle invariance principle, combined with the use of the properties of the matrix Kronecker product, stochastic differential equation theory and other related tools, by constructing the appropriate Lyapunov functional, the criterion for the distributed synchronization of this type of stochastic complex networks in mean square is obtained.

关键词： Stochastic Dynamical System Time-Varying Delay distributed synchronization Randomly Occurring Control

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Physical-layer distributed synchronization in wireless networks and applications

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Physical Communication 2008年第1期1卷 67-83页

作者： Simeone, O. Spagnolini, U. Scutari, G. Bar-Ness, Y. Center for Wireless Communications and Signal Processing Research New Jersey Institute of Technology Newark NJ 07102-1982 United States Dip. di Elettronica e Informazione Politecnico di Milano I-20133 Milano P.zza L. da Vinci 32 Italy Dip. INFOCOM Univ. of Rome La Sapienza 00184 Rome via Eudossiana 18 Italy

Physical-layer (pulse-coupled) techniques for distributed synchronization in wireless networks are attracting significant attention for their efficiency and scalability. In this paper, the model of pulse-coupled discrete Phase Locked Loops is reviewed and further investigated in two directions. At first, we extend the characterization of (frequency or phase) synchronous states and convergence conditions from homogeneous networks, where all the nodes have the same power constraints, to more general heterogeneous networks. Towards this goal, we build on recent results on algebraic graph theory for generally non-bidirectional graphs, and derive: (i) necessary and sufficient conditions for global synchronization of the network;(ii) closed-form expressions for the asymptotic values of frequency and phases, as a function of the network topology. In the second part of the paper, an application of pulse-coupled synchronization is considered, namely data collection in a sensor network. The energy efficiency of two medium access protocols for data collection from a set of randomly located sensors to an access point is compared: (i) basic ALOHA (which does not require time synchronization among the sensors);(ii) slotted ALOHA, where time synchronization is achieved via pulse-coupled clocks. Analysis shows that the energy spent for maintaining synchronization in slotted ALOHA pays off in terms of total energy consumption with respect to basic ALOHA provided that the number of sensors is sufficiently small. Moreover, the energy gain is proved to depend explicitly on the system load (in terms of packets /s), hardware and topology of the network. © 2008 Elsevier Ltd. All rights reserved.

关键词： Ad hoc networks distributed synchronization PLLs Sensor networks

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