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Design and implementation of flexible resampling mechanism for high-speed parallel particle filters

Journal of VLSI Signal Processing systems for Signal, Image, and Video Technology 2006年第1-2期44卷 47-62页

作者： Hong, Sangjin Chin, Shu-Shin Djurić, Petar M. Bolić, Miodrag Mobile Systems Design Laboratory Department of Electrical and Computer Engineering Stony Brook University - SUNY Stony Brook NY 11794-2350 School of Information Technology and Engineering University of Ottawa Ottawa Ont. K1N 6N5 Canada

There are many applications in which particle filters outperform traditional signal processing algorithms. Some of these applications include tracking, joint detection and estimation in wireless communication, and computer vision. However, particle filters are not used in practice for these applications mainly because they cannot satisfy real-time requirements. This paper presents an efficient resampling architecture for parallel particle filtering. The proposed architecture is flexible such that it supports various modes of parallel resampling operations with up to four processing elements. The resampling algorithm is developed in order to compensate for possible error caused by finite precision quantization in the resampling step. Communication between the processing elements after resampling is identified as an implementation bottleneck, and therefore, concurrent buffering is incorporated in order to speed up communication of particles among processing elements. The flexible resampling mechanism is implemented in 0.35 μ m CMOS process and its complexity and performance are analyzed. © 2006 Springer Science + Business Media, LLC.

关键词： Digital filters

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Numerical modeling of the transient response in thulium-doped fiber amplifiers

Numerical modeling of the transient response in thulium-dope...

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Optical Fiber Communication Conference, OFC 2006

作者： Kim, Jaedon Yam, S.S-H. Marhic, M.E. Kazovsky, L.G. Photonics and Networking Research Laboratory Stanford University 058 Packard Building Stanford CA 94305 United States Department of Electrical and Computer Engineering Queen's University Walter Light Hall Kingston ON Canada

A transient response model for thulium-doped fiber amplifier is presented. With an optimally chosen method for numerical integration, we can successfully estimate the transient response of thulium-doped amplifier, whi... 详细信息

ISBN: (纸本)1557528020

关键词： Transient analysis

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On packet aggregation mechanisms for improving VoIP quality in mesh networks

On packet aggregation mechanisms for improving VoIP quality ...

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2006 IEEE 63rd Vehicular Technology Conference, VTC 2006-Spring

作者： Kyungtae, Kim Ganguly, Samrat Izmailov, Rauf Sangjin, Hong IP Network and Distributed Systems NEC Laboratories America Princeton NJ 08540 Mobile Systems Design Laboratory Department of Electrical and Computer Engineering State University of NY Stony Brook NY 11794

ISBN: (纸本)0780393929

Performance in multihop wireless networks is known to degrade with the number of hops for both TCP and UDP traffic. For VoIP, the wireless network presents additional challenges as the perceived quality is dependent on loss, delay and jitter. Furthermore, small size of VoIP packets aggravates network utilization of the 802.11 based wireless mesh network. In this work, we evaluate the packet aggregation algorithms to reduce VoIP protocol overhead, compare the aggregation algorithms and propose a distributed packet aggregation mechanism. The experimental results demonstrates that the proposed distributed packet aggregation algorithm improves the VoIP quality and results in significant increase in the number high quality VoIP calls supported over multihop mesh. © 2006 IEEE.

关键词： Wireless networks

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Experimental multipath component results from MIMO measurements in a microcell urban environment 12

Experimental multipath component results from MIMO measureme...

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12th European Wireless Conference on Enabling Technologies for Wireless Multimedia Communications, European Wireless 2006

作者： Skentos, Nikolaos D. Kanatas, Athanasios G. Constantinou, Philip Mobile Radio Communications Laboratory School of Electrical and Computer Engineering National Technical University of Athens Greece Department of Technology Education and Digital Systems University of Piraeus Greece

ISBN: (纸本)9783800729616

This paper presents results on the parameters of multi path components extracted from wideband measured MIMO channel matrices. Experimental data were collected with wideband channel sounding measurements at 5.2 GHz in a microcell urban environment, under line of sight propagation conditions. The double directional and propagation delay parameter values of the dominant multipaths were estimated using the multidimensional parameter estimation algorithm. The results presented provide information in the context of parametric MIMO channel characterization and refer to the number of identified waves, and focus on the path weights characteristics. Additionally, the extracted multipath estimates are used to synthesize MIMO matrices that are compared to the directly measured data.

关键词： Matrix algebra

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Implementing a cooperative MAC protocol for wireless LANs

Implementing a cooperative MAC protocol for wireless LANs

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2006 IEEE International Conference on Communications, ICC 2006

作者： Korakis, Thanasis Narayanan, Sathya Bagri, Abhijit Panwar, Shivendra Department of Electrical and Computer Engineering Polytechnic University Brooklyn NY United States Panasonic Digital Networking Laboratory Two Research Way Princeton NJ 08540 United States Indian Institute of Technology Kanpur India

ISBN: (纸本)1424403553

In wireless LANs that provide multi-rate support (IEEE 802.11a, 802.11b), stations that experience poor channel quality tend to use low transmission rates to reduce the bit-error-rate (BER) of each transmission. This phenomenon usually leads to a throughput fairness problem between the stations with good channel quality and those without. This fairness problem has been shown to result in throughput degradation for the whole network [8]. The MAC protocol proposed in [5] addresses this issue using an efficient cooperative scheme. Under this scheme, low rate stations are assisted by a high rate station, referred to as helper stations, in its transmissions. With such assistance, the low rate station will be able to transmit data at a higher rate in a two-hop manner using the helper station. We implemented this new protocol in a Linux testbed. This paper describes the assumptions, the implementation process and the challenges we were presented with. We evaluated the protocol using our testbed through experiments. The implementation of the protocol shows that it performs efficiently in supporting TCP applications. © 2006 IEEE.

关键词： Medium access control

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Guest Editorial price-based access control and economics of networking

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IEEE Journal on Selected Areas in Communications 2006年第5期24卷 937-938页

作者： Mazumdar, Ravi R. Courcoubetis, Costas A. Duffield, Nick Kesidis, George Odlyzko, Andrew Srikant, R. Walrand, Jean University of Waterloo Department of Electrical and Computer Engineering Waterloo Ont. N2L 3G1 Canada Athens University of Economics and Business Department of Informatics Athens 10434 Greece AT and T Laboratories Florham Park NJ 07932-0971 United States Pennsylvania State University Department of Electrical and Computer Engineering University Park PA 16802 United States University of Minnesota Digital Technology Center Minneapolis MN 55455 United States University of Illinois at Urbana-Champaign Coordinated Science Laboratory Urbana IL 61801 United States University of California at Berkeley Department of Electrical Engineering and Computer Sciences Berkeley CA 94720 United States Department of Electrical and Computer Engineering University of Waterloo Waterloo Ont. Canada Department of Electrical and Computer Engineering Purdue University West Lafayette IN United States Royal Statistical Society Canada Canada Canada Canada Network Economics and Services Group Theory Economics and Systems Laboratory Athens University of Economics and Business Athens Greece Network Management and Performance Department AT and T Laboratories-Research Florham Park NJ United States Electrical Engineering and Computer Science and Engineering Departments Pennsylvania State University University Park United States Digital Technology Center United States University of Minnesota Minneapolis United States University of Illinois Urbana-Champaign United States Department of Electrical and Computer Engineering Canada Coordinated Science Laboratory United States Department of Electrical Engineering and Computer Sciences University of California at Berkeley Berkeley United States Belgian American Education Foundation United States

No abstract available

关键词： Access control Pricing Web and internet services IP networks Optimal control Quality of service Impedance History Internet telephony Convergence

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A stochastic unbiased minimum mean error rate algorithm for decision feedback equalizers

A stochastic unbiased minimum mean error rate algorithm for ...

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3rd IASTED International Conference on Signal Processing, Pattern Recognition, and Applications

作者： Yen, Rainfield Y. Cha, Mei Ting Young, Ming-Hwa Department of Electrical Engineering Tamkang University 151 Ying-Chuan Road Tamsui Taipei Taiwan Photonics Laboratory Department of Computer Systems and Communication Engineering Universiti Putra Malaysia 43400 UPM Serdang Selanor Malaysia

ISBN: (纸本)0889865477

Capitalizing on a well-known minimum mean square error (MMSE) property for decision feedback equalization (DFE) along with the use of stochastic gradient approach, we formulate an adaptive minimum error rate (MER) algorithm for DFE over M-ary PAM channels to be named as stochastic unbiased minimum mean error rate (SUMMER). Comparisons are made between SUMMER and existing MER algorithms in the literature and SUMMER is found to outperform others.

关键词： Algorithms

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Fault diagnosis with dynamic fuzzy discrete event system approach

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14th Turkish Symposium on Artificial Intelligence and Neural Networks, TAINN 2005

作者： Kiliç, Erdal Karasu, Çaǧlar Leblebicioǧlu, Kemal Middle East Technical University Electrical and Electronic Engineering Department Computer Vision and Intelligent Systems Laboratory 006531 Ankara Turkey Tübitak Sage 06531 Ankara Turkey

ISBN: (纸本)3540367136

Determining faults is a challenging task in complex systems. A discrete event system (DES) or a fuzzy discrete event system (FDES) approach with a fuzzy rule-base may resolve the ambiguity in a fault diagnosis problem especially in the case of multiple faults. In this study, an FDES approach with a fuzzy rule-base is used as a means of indicating the degree and priority of faults, especially in the case of multiple faults. The fuzzy rule-base is constructed using event-fault relations. Fuzzy events occurring any time with different membership degrees are obtained using k-means clustering algorithm. The fuzzy sub-event sequences are used to construct super events. The study is concluded by giving some examples about the distinguishability of fault types (parameter, actuator) in an unmanned small helicopter. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Fault tolerant computer systems

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Design and control of a four steered wheeled mobile robot

Design and control of a four steered wheeled mobile robot

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IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Lauria, Michel Nadeau, Isabelle Lepage, Pierre Morin, Yan Giguère, Patrick Gagnon, Fréderic Létourneau, Dominic Michaud, François Department of Electrical Engineering and Computer Engineering Research Laboratory on Mobile Robotics and Intelligent Systems Université de Sherbrooke Sherbrooke QC J1K 2R1 Canada

ISBN: (纸本)1424401364

This paper presents the kinematical analysis of AZIMUT-2, a four steered wheeled mobile robot. The utilization of a new wheel concept called the AZIMUT wheel allowed us to create an innovative omnidirectional non-holonomic robot. Novelty of this wheel concept resides in the non-conventional positioning of the steering axis and the wheel axis. We propose a kinematical model based on the geometrical constraints of these wheels. The degree of mobility, steerability and maneuverability are studied. Additionally, we describe a special design implementation of the wheel mechanism to overcome a hypermotorization issue inherent to the wheel's geometrical properties. Finally, we describe AZIMUT-2's two operational and seven locomotion modes, along with a control algorithm based on the kinematical model of the robot. © 2006 IEEE.

关键词： Wheels

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A thermal, mechanical, and electrical study of voiding in the solder die-attach of power MOSFETs

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IEEE Transactions on Components and Packaging Technologies 2006年第1期29卷 127-136页

作者： Katsis, Dimosthenis C. van Wyk, Jacobus Daniel U.S. Army Research Laboratory AMSRL-SE-DP Adelphi MD 20742 United States Center for Power Electronics Systems The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA 24061 United States

Large area die-attach defects have been shown to increase the thermal impedance of power semiconductor devices. The changes in thermal performance are simulated and measured in the silicon die using one-, two-, and three-dimensional methods. Experimental measurements for devices with various levels of die-attach void growth are presented. This data is then correlated with finite element thermal modeling to improve the estimate of peak die temperature for voided semiconductor devices. The results present a complete understanding of the heat flow within the voided semiconductor package with an estimate of its impact on performance over its lifetime. © 2006 IEEE.

关键词： MOSFET devices

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