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End-to-end delay analysis for networked systems

Frontiers of Information Technology & Electronic engineering 2015年第9期16卷 732-743页

作者： Jie SHEN Wen-bo HE Xue LIU Zhi-bo WANG Zhi WANG Jian-guo YAO Department of Control Science and Engineering Zhejiang University School of Computer Science Mc Gill University School of Computer Wuhan University Su zhou Institute of Wuhan University School of Software Shanghai Jiao Tong University

End-to-end delay measurement has been an essential element in the deployment of real-time services in networked systems. Traditional methods of delay measurement based on time domain analysis, however, are not efficient as the network scale and the complexity increase. We propose a novel theoretical framework to analyze the end-to-end delay distributions of networked systems from the frequency domain. We use a signal flow graph to model the delay distribution of a networked system and prove that the end-to-end delay distribution is indeed the inverse Laplace transform of the transfer function of the signal flow graph. ~vo efficient methods, Cramer＇s rule-based method and the Mason gain rule-based method, are adopted to obtain the transfer function. By analyzing the time responses of the transfer function, we obtain the end-to-end delay distribution. Based on our framework, we propose an efficient method using the dominant poles of the transfer function to work out the bottleneck links of the network. Moreover, we use the framework to study the network protocol performance. Theoretical analysis and extensive evaluations show the effectiveness of the proposed approach.

关键词： Networked system End-to-end Delay distribution

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State-space representations for 2×2 hyperbolic systems with boundary inputs

State-space representations for 2×2 hyperbolic systems with...

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International Conference on Methods and Models in Automation and Robotics (MMAR)

作者： Krzysztof Bartecki Institute of Control and Computer Engineering Opole University of Technology Opole Poland

The paper discusses different abstract state-space representations for a class of linear distributed parameter systems of hyperbolic type defined on a one-dimensional spatial domain. It starts with the homogeneous state equation including the unbounded formal state operator. Based on the semigroup approach, some theoretical results of well-posedness and internal stability for the considered systems are given here. Next, the boundary and observation operators are introduced, taking a typical boundary inputs configuration as well as pointwise observations of the state variables. Consequently, the homogeneous state equation is extended to the so-called boundary control state/signal form. Finally, the most classical state-space representation involving typical (A, B, C)-triple of state, input and output operators is considered together with the definition of the Pritchard-Salamon class of infinite-dimensional systems.

关键词： Mathematical model Boundary conditions Heating Hilbert space Stability analysis Transmission line matrix methods Eigenvalues and eigenfunctions

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Stability Analysis and PI control Synthesis under Event-Triggered Communication

Stability Analysis and PI Control Synthesis under Event-Trig...

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European control Conference

作者： Sven Reimann Duc Hai Van Sanad Al-Areqi Steven Liu Institute of Control Systems Department of Electrical and Computer Engineering University of Kaiserslautern

ISBN: (纸本)9781467371605

Although setpoint tracking problems are common in practice, they are still widely unexplored in the event-triggered control framework. Therefore, an event-triggered PI control design strategy with guaranteed performance for networked control systems is proposed in this paper. The integral state of the proposed PI controller is updated at every sampling instant. The update is done by the proposed event generator and sent with new measurements to the PI controller when necessary. Based on a discretized system model and a quadratic cost function, the event-triggered PI control design problem is introduced and formulated as an LMI optimization problem. The effectiveness of the proposed strategy is then experimentally evaluated and compared with other existing strategies in the literature for a case study.

关键词： Pi control Stability analysis Closed loop systems Cost function Symmetric matrices Mathematical model

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Enhancing quantum control by bootstrapping a quantum processor of 12 qubits

arXiv

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arXiv 2017年

作者： Lu, Dawei Li, Keren Li, Jun Katiyar, Hemant Park, Annie Jihyun Feng, Guanru Xin, Tao Li, Hang Long, Guilu Brodutch, Aharon Baugh, Jonathan Zeng, Bei Laflamme, Raymond Department of Physics Southern University of Science and Technology Shenzhen518055 China Institute for Quantum Computing Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Beijing Computational Science Research Center Beijing100193 China Max-Planck-Institutfür Quantenoptik GarchingD-85748 Germany Center for Quantum Information and Quantum Control Department of Physics Department of Electrical and Computer Engineering University of Toronto TorontoONM5S 3H6 Canada Department of Mathematics and Statistics University of Guelph GuelphONN1G 2W1 Canada Perimeter Institute for Theoretical Physics Waterloo ONN2L 2Y5 Canada

Accurate and efficient control of quantum systems is one of the central challenges for quantum information processing. Current state-of-the-art experiments rarely go beyond 10 qubits and in most cases demonstrate only limited control. Here we demonstrate control of a 12-qubit system, and show that the system can be employed as a quantum processor to optimize its own control sequence by using measurement-based feedback control (MQFC). The final product is a control sequence for a complex 12-qubit task: preparation of a 12-coherent state. The control sequence is about 10% more accurate than the one generated by the standard (classical) technique, showing that MQFC can correct for unknown imperfections. Apart from demonstrating a high level of control over a relatively large system, our results show that even at the 12-qubit level, a quantum processor can be a useful lab instrument. As an extension of our work, we propose a method for combining the MQFC technique with a twirling protocol, to optimize the control sequence that produces a desired Clifford gate. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum optics

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Device-free human presence detection using frequency domain 1

Device-free human presence detection using frequency domain

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1st IEEE International Workshop on Consumer Electronics - Novi Sad, CE WS 2015

作者： Mrazovac, Bojan Todorovic, Branislav M. Kukolj, Dragan Temerinac, Miodrag Department for Computing and Control Engineering Faculty of Technical Sciences Novi Sad Serbia RT-RK Institute for Computer Based Systems Narodnog fronta 23a Novi Sad Serbia

ISBN: (纸本)9781509042685

Device-free human presence (DFHP) detection is a novel technique, mainly applicable to wireless sensor networks in which a human does not need to carry a wireless transceiver to be detected. Irregularities in the radio signal propagation pattern, expressed in a form of received signal strength indicator's (RSSI) variations can indicate possible presence of a human within the existing radio network. In this paper we propose DFHP detection method based on frequency analysis of RSSI variations. The main advantage of the proposed method compared to human detection method based on information entropy is the possibility to determine human presence from furniture layout change. The main drawback is a disability to recognize the absence from the presence of a motionless person in an environment. However, the combination of these two approaches defines a robust and cost-effective DFHP detection method that can be used in various smart home systems without the need for specific hardware installation and exploitation procedures. © 2015 IEEE.

关键词： Fast Fourier transforms

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Stochastic MPC of Systems with Additive Disturbance using Scenario Optimization *

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IFAC-PapersOnLine 2015年第23期48卷 236-241页

作者： Xiaohai Lin Daniel Görges Sebastian Caba Steven Liu Juniorprofessorship for Electromobility Department of Electrical and Computer Engineering University of Kaiserslautern Kaiserslautern Germany Institute of Control Systems Department of Electrical and Computer Engineering University of Kaiserslautern Kaiserslautern Germany

In this paper a stochastic model predictive control (SMPC) scheme for linear systems with additive disturbance is presented. The goal is to design a controller that minimizes the expected value of an objective function while guaranteeing mean-square exponential input-tostate stability (MSE-ISS) and constraints on the states and inputs. The SMPC is partitioned into an offline computation based on a bilinear matrix inequality (BMI) problem for ensuring ISS, constraint satisfaction, and recursive feasibility and an online optimization based on a quadratically constrained quadratic programming (QCQP) problem for including knowledge about the additive disturbance while relaxing ISS to MSE-ISS. The partition into an offliine computation and online optimization allows addressing stability, feasibility, and performance separately and therefore improving performance as well as handling disturbances which may not be independent identically distributed (i.i.d.). The effectiveness of the SMPC scheme is evaluated by simulations and assessed by comparison with a robust MPC scheme.

关键词： Model predictive control stochastic control robust control mean-square stability input-to-state stability

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Improvement of the LPV-based vehicle control design considering the polynomial invariant set analysis

Improvement of the LPV-based vehicle control design consider...

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American control Conference

作者： Balazs Nemeth Peter Gaspar Jozsef Bokor Systems and Control Laboratory Institute for Computer Science and Control Hungarian Academy of Sciences Hungary Institute for Computer Science and Control Hungarian Academy of Sciences and MTA-BME Control Engineering Research Group Hungary

ISBN: (纸本)9781479917730

The paper proposes a method for the improvement of the LPV (Linear Parameter-Varying) based control design for lateral vehicle dynamics. The novelty of the method is the combination of the LPV-based control design and the results of the analysis based on the Sum-of-Squares-based (SOS) polynomial controlled invariant set. In the LPV modeling of the lateral vehicle dynamics, the control design and the analysis of the polynomial model of the tire characteristics are also handled. The results of the analysis based on controlled invariant set are integrated in the selection of the design parameters of the LPV method. The proposed method improves performances of vehicle dynamics and handles the critical maneuvers caused by e.g. skidding car and high velocities. The proposed method is illustrated through a simulation example.

关键词： Vehicle dynamics design control design parameter Invariant Vehicle control Polynomial Models Polynomial

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Event-Based control and Scheduling Codesign Subject to Input and State Constraints

Event-Based Control and Scheduling Codesign Subject to Input...

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European control Conference

作者： Sanad Al-Areqi Daniel Gorges Steven Liu Institute of Control Systems Department of Electrical and Computer Engineering University of Kaiserslautern Department of Electrical and Computer Engineering University of Kaiserslautern

ISBN: (纸本)9781467371605

This paper addresses control and scheduling code-sign problem for multiple control loops sharing a common communication and computation medium, known also as networked embedded control system (NECS) in literature. Besides the limited communication medium, physical limitations on control inputs and/or states are considered as well. To avoid unnecessary use of the limited communication medium, each control loop is equipped with a model-based event generator requesting a network access only if a necessity exists and thus minimizing the traffic load on the network. The NECS with uncertain but interval-bounded time-varying communication and computation delays is modeled as a discrete-time switched poly-topic system. Based on the resulting model and the proposed model-based event generators, the codesign problem is then introduced and formulated as an LMI optimization problem which can be solved completely offline. The effectiveness of the codesign strategy is evaluated for networked control of an active suspension system. Noteworthy, the proposed strategy is generally applicable to discrete-time switched polytopic systems.

关键词： Generators Mathematical model Computational modeling Delays control systems Communication networks Load modeling

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A review on effects of the atmospheric turbulence on laser beam propagation — An analytic approach

A review on effects of the atmospheric turbulence on laser b...

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International Symposium on Communication Systems, Networks and Digital Signal Processing, CNSDSP

作者： Mircea Hulea Xuan Tang Zabih Ghassemlooy Sujan Rajbhandari Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Iasi Romania Optical Communications Research Group Northumbria University Newcastle United Kingdom Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fujian China School of Computing Electronics and Mathematics Coventry University United Kingdom

ISBN: (纸本)9781509025275

The main effects of atmospheric turbulence on the laser beams propagation are scintillation, beam wandering, and phase front distortion. The first two can be compensated simply by using aperture averaging, whereas the later, which is of high importance in high data rates free space optics communications, is much more complex. This paper gives a review of principal analytical methods used to simulate and characterize the optical beam propagation through the turbulence channel focussing on phase front distortion. The paper presents simple models suitable for computer simulations of beam wandering and scintillation. This is followed by more complex theoretical approaches in analysing the turbulence induced phase front distortion and the calculation of the mutual coherence function of partially coherent beams propagating through an inhomogeneous medium. The theoretical analysis of beam coherence and phase front distortion due to turbulence represents the first step for elaboration of the mitigation methods.

关键词： Laser beams Optical beams Atmospheric modeling Phase distortion Optical distortion Refractive index

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A new algorithm for the weighted sum rate maximization in MIMO interference networks

A new algorithm for the weighted sum rate maximization in MI...

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2015 IEEE Wireless Communications and Networking Conference, WCNC 2015

作者： Li, Xing You, Seungil Chen, Lijun Liu, An Liu, Youjian Eugene College of Engineering and Applied Science University of Colorado at Boulder United States Department of Control and Dynamical Systems California Institute of Technology United States Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong

ISBN: (纸本)9781479984060

MIMO interference network optimization is important for increasingly crowded wireless communication networks. This paper presents a new algorithm, named Dual Link Algorithm, for weighted sum-rate maximization where the interference is efficiently managed. We consider general MIMO interference channels with Gaussian input and a total power constraint. Two of the previous state-of-the-art algorithms are the WMMSE algorithm and the polite water-filling (PWF) algorithm. The WMMSE algorithm is provably convergent, while the PWF algorithm takes the advantage of the optimal transmit signal structure and converges the fastest in most situations but is not guaranteed to converge in all situations. Therefore, it is highly desirable to design an algorithm that has the advantages of both algorithms. The proposed dual link algorithm is such an algorithm. Its fast and guaranteed convergence is important to distributed implementation and time varying channels. In addition, the technique and a scaling invariance property used in the convergence proof may find applications in other non-convex problems in communication networks. © 2015 IEEE.

关键词： MIMO systems

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