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检索条件"机构=Control and Telecommunications Research Laboratory Electrical and Computer Engineering"

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Energy-efficient infrastructure formation in MANETs

Energy-efficient infrastructure formation in MANETs

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Conference on Local computer Networks (LCN)

作者： A. Safwat H. Hassanein H. Mouftah Telecommunications Research Laboratory Department of Computer Science Queen's University Kingston ONT Canada Department of Electrical & Computer Engineering Queen's University Kingston ONT Canada

ISBN: (纸本)0769513212

We propose a novel protocol for wireless mobile ad hoc networks, which establishes a dynamic wireless mobile infrastructure. The proposed protocol, namely, the power-aware virtual base stations (PA-VBS) protocol, mimics and maintains the operation of the conventional fixed infrastructure in cellular networks. In the PA-VBS protocol, a mobile node is elected from a set of nominees to act as a temporary base station within its zone based on its normalized power value. Likewise, we study the characteristics and performance of PA-VBS by means of simulation. It is shown that PA-VBS scales well to large networks of mobile stations, and that it outperforms other infrastructure-formation protocols in terms of load balancing.

关键词： Energy efficiency Mobile ad hoc networks Wireless application protocol Routing protocols Ad hoc networks Mobile communication Base stations Access protocols Load management Media Access Protocol

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Power-aware fair infrastructure formation for wireless mobile ad hoc communications

Power-aware fair infrastructure formation for wireless mobil...

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IEEE Conference and Exhibition on Global telecommunications (GLOBECOM)

In this paper, we propose a novel infrastructure formation protocol for wireless mobile ad hoc networks. In our proposed protocol, namely, the Power-Aware Virtual Base Stations (PA-VBS) protocol, a mobile node is elected from a set of nominees to act as a base station within its zone based on its residual battery capacity. Likewise, we study the characteristics and performance of PA-VBS by means of simulation. It is shown that PA-VBS outperforms other infrastructure-formation protocols in terms of load balancing, and attains fair clustering. PA-VBS is also shown, in our simulation experiments, to react positively to different routing loads. To the authors' best knowledge, this is the first time that battery capacity has been used as a basis for developing a wireless mobile infrastructure, and achieving load balancing.

关键词： Mobile communication Ad hoc networks Wireless application protocol Mobile ad hoc networks Routing protocols Access protocols Base stations Load management Media Access Protocol Batteries

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An improved hybrid multiuser interference cancellation scheme based on the clustering algorithm

An improved hybrid multiuser interference cancellation schem...

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IEEE Conference on Vehicular Technology (VTC)

作者： Soojung Jung Hyung-Myung Kim Radio & Broadcasting Technology Laboratory Electronics and Telecommunications Research Institute South Korea Department of Electrical Engineering and Computer science Korea Advanced Institute of Science and Technology South Korea

We analyze the performance of the hybrid multiuser interference cancellation scheme when each user in the same group has different received signal power. On the basis of this analysis, it is shown that the conventional HIC which divides the active users into several groups of equal size experiences a performance degradation due to the large difference in received signal powers when the power control is not applied or imperfect. We propose a new improved HIC scheme that divides the active users into groups of variable size according to their received powers using a clustering algorithm. Numerical examples illustrate that the BER performance of the proposed HIC scheme is superior to that of the conventional HIC in the case of imperfect power control or no power control.

关键词： Interference cancellation Clustering algorithms Silicon carbide Power control Bit error rate Multiaccess communication Power system modeling AWGN Signal analysis Performance analysis

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Incremental, dynamic, virtual circuit connection (IVCC): a new paradigm for routing in future high-speed networks

Incremental, dynamic, virtual circuit connection (IVCC): a n...

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IEEE International Conference on Communications (ICC)

作者： Q. Razouqi T. Lee Seong-Soon Joo S. Ghosh Electrical Engineering Department Kuwait University Kuwait Networking and Distributed Algorithms Laboratory Department of Computer Science & Engineering Arizona State University Tempe AZ USA Electronics and Telecommunications Research Institute Daejeon South Korea

This paper presents a new routing strategy, termed incremental virtual circuit connection (IVCC), that is ideally suited for a class of call requests that promise to underlie future high-speed networks. IVCC aims to reduce the idling of reserved resources, thereby improving the sharing of network resources among users and increasing call success rate. Under IVCC, the subsequent subpaths, starting at the source node, are computed, reserved, and utilized incrementally. Initially, the source node (SN) computes the entire path all the way to the destination node (DN), but propagates the call admission control (CAC) to reserve network resources only for a subset of the entire path, where the choice of the subpath is based on the organization and topology of the network. This paper hypothesizes that the efficient use of resources in IVCC will significantly reduce the probability of failures. Thus, IVCC's uniqueness consists of two key elements. First, the actual route for a source traffic is successively and dynamically refined, utilizing up-to-date information on the state of the network, but always keeping an "eye" towards the destination. Second, traffic cells are launched from the source node or any of the intermediate nodes only after the network resources along the subsequent subpath have been reserved. IVCC has been modeled for two representative ATM networks, a 15-node network spread over the continental US and a 50-node network extending throughout the world, and extensively simulated for a large number of realistic input traffic stimuli utilizing an asynchronous distributed simulation algorithm running on a network of workstations. For a comparative analysis, ATM Forum's P-NNI is also modeled and simulated for identical networks and under identical traffic conditions.

关键词： Circuits Telecommunication traffic Traffic control Asynchronous transfer mode Routing High-speed networks Tin computer networks Call admission control Network topology

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Dynamic network flow optimization models for air vehicle resource allocation

Dynamic network flow optimization models for air vehicle res...

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American control Conference (ACC)

作者： K.E. Nygard P.R. Chandler M. Pachter Department of Computer Science and Operations Research North Dakota State University Fargo ND USA Flight Control Division Air Force Research Laboratory OH USA Department of Electrical and Computer Engineering Air Force Institute of Technology OH USA

A weapon system consisting of a swarm of air vehicles whose mission is to search for, classify, attack, and perform battle damage assessment, is considered. It is assumed that the target field information is communicated to all the elements of the swarm as it becomes available. A network flow optimization problem is posed whose readily obtained solution yields the optimum resource allocation among the air vehicles in the swarm. Hence, the periodic reapplication of the centralized optimization algorithm yields the benefit of cooperative feedback control.

关键词： Vehicle dynamics Vehicles Resource management Weapons Vehicle detection computer science Operations research Neodymium Aerospace control Force control

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An application of nonlinear PID control to a class of truck ABS problems

An application of nonlinear PID control to a class of truck ...

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IEEE Conference on Decision and control

作者： F. Jiang Z. Gao Product Development Center Ford Motor Company Limited Dearborn MI USA The Applied Control Research Laboratory Department of Electrical and Computer Engineering Cleveland State University Cleveland OH USA

A NPID (nonlinear PID) control algorithm is applied to a class of truck ABS (anti-lock brake system) problems. The NPID algorithm combines the advantages of robust control and easy tuning. Simulation results at various situations using TruckSim show that NPID controller has shorter stopping distance and better velocity performance than the conventional PID controller and a loop-shaping controller.

关键词： Three-term control Wheels control systems Stability Velocity control Vehicle dynamics Pressure control Pulse width modulation Friction Nonlinear control systems

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Nonlinear control of a pneumatic muscle actuator: backstepping vs. sliding-mode

Nonlinear control of a pneumatic muscle actuator: backsteppi...

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IEEE Conference on control Technology and Applications (CCTA)

作者： P. Carbonell Z.P. Jiang D.W. Repperger Department of Systems Engineering and Control Polytechnic University of Valencia Alcoy Spain Department of Electrical and Computer Engineering Six Metrotech Center Polytechnic University Brooklyn NY USA Air Force Research Laboratory OH USA

This paper weighs up the pros and cons of three different tracking controllers for a pneumatic muscle actuator: robust backstepping, adaptive backstepping and sliding-mode. Robustness is assured for three controllers in the presence of model uncertainties and external perturbations. Ultimate boundedness is proved for the robust and adaptive backstepping tracking controller. Exponential stability is proved for the sliding-mode tracking controller. The tracking is well achieved by the sliding-mode and the adaptive controller. On the contrary, the robust backstepping shows a noticeable tracking error. The sliding-mode leads to a high-frequency switching control law.

关键词： Muscles Pneumatic actuators Backstepping Sliding mode control Robust control Programmable control Adaptive control Uncertainty Stability Robustness

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UAV cooperative control

UAV cooperative control

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American control Conference (ACC)

作者： P.R. Chandler M. Pachter S. Rasmussen Flight Control Division Air Force Research Laboratory OH USA Department of Electrical and Computer Engineering Air Force Institute of Technology OH USA Veridian Inc. OH USA

This paper addresses the development of cooperative rendezvous and cooperative target classification agents in a hierarchical distributed control system for unmanned aerospace vehicles. For cooperative rendezvous, a Voronoi based polygonal path is generated to minimize exposure to radar. The rendezvous agent minimizes team exposure from Individual coordination functions while satisfying stringent timing constraints. For cooperative target classification, templates are developed, optimal trajectories are followed, and adjacent vehicles are assigned to view at complementary aspect angles. Views axe statistically combined to maximize the probability of correct target classification over various aspect angles.

关键词： Unmanned aerial vehicles Trajectory Aerospace control Radar Timing Turning Force control Laboratories Distributed control Aerospace engineering

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A fuzzy backstepping controller for a pneumatic muscle actuator system

A fuzzy backstepping controller for a pneumatic muscle actua...

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IEEE International Symposium on Intelligent control (ISIC)

作者： P. Carbonell Z.P. Jiang D.W. Repperger Department of Systems Engineering and Control Polytechnic University of Valencia Alcoy Spain Department of Electrical and Computer Engineering Brooklyn Metrotech Center Polytechnic University Brooklyn NY USA HECP Air Force Research Laboratory OH USA

A nonlinear fuzzy backstepping controller is presented for set-point regulation of a pneumatic muscle actuator. Inflation and deflation are the two possible modes of operation of this actuator. Three fuzzy sets, one for each of both modes and one for the transition region, are considered. Each fuzzy set is associated with a local backstepping controller. At the inflation and deflation regimes, the associated controllers are exact backstepping controllers, whereas a robust nonlinear backstepping controller is used at the transition regime and deals with regime uncertainty. The use of fuzzy membership functions provides a smooth controller. The closed-loop system is globally and ultimately bounded.

关键词： Fuzzy control Fuzzy systems Backstepping control systems Muscles Pneumatic actuators Sliding mode control Nonlinear control systems Robust control Nonlinear dynamical systems

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Performance of smart antennas with adaptive combining at handsets for the 3GPP W-CDMA system

Performance of smart antennas with adaptive combining at han...

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IEEE Conference on Vehicular Technology (VTC)

作者： Suk Won Kim Dong Sam Ha Jeong Ho Kim Jung Hwan Kim Department of Electrical and Computer Engineering. Virginia Tech. Blacksburg VTVT (Virginia Tech VLSI for Telecommunications) Laboratory Virginia USA Department of Electrical and Computer Engineering. Virginia Tech. Blacksburg VTVT (Virginia Tech VLSI for Telecommunications) Laboratory Blacksburg Virginia USA Next Generation Wireless Communication Research Laboratory LG Electronics Inc. Kyongki-do Korea System Engineering Department University of Arkansas at Little Rock 2801 S. University Avenue Little Rock Arkansas USA

ISBN: (纸本)0780370058

We present the performance gain of dual smart antennas with adaptive combining at handsets for the 3GPP W-CDMA system. The adaptive algorithm based on the normalized least-mean-square (N-LMS) algorithm is employed, in which antenna weights are recursively obtained. To obtain the channel profile, we adopted the GBSB (geometrically based single bounce) elliptical and circular models. The simulation results show that the dual smart antenna system with adaptive combining performs better than a single antenna system and its performance gain is 3.3 dB for the GBSB elliptical model at BER of 5/spl times/10/sup -2/ and 5.5 dB for the GBSB circular model. The higher performance gain is achieved as the mobile velocity decreases.

关键词： Adaptive arrays Telephone sets Multiaccess communication Diversity reception Interference Performance gain Signal processing Base stations Costs Energy consumption

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