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A memory efficient method for fast transposing run-length encoded images 5

A memory efficient method for fast transposing run-length en...

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5th International Conference on Document Analysis and Recognition, ICDAR 1999

作者： Misra, Vishal Arias, Juan F. Chhabra, Atul K. Bell Atlantic Network Systems Advanced Technology 500 Westchester Avenue White PlainsNY10604 United States Department of Electrical and Computer Engineering University of Massachusetts at Amherst AmherstMA01003 United States

ISBN: (纸本)0769503187

We present a memory efficient method for transposing a run-length encoded bi-level image. Image transposing is a commonly used operation for affine transformations such as document image deskewing. The best existing method for transposing a run-length image is the pxy table based method. For images of typical engineering drawings, which are large, crowded and noisy, this method requires an exorbitant amount of memory. The method proposed uses a very compact representation of run-length encoded images. Also, it bypasses certain steps from the pxy table based method. Consequently, the saving in memory use is proportional to the number of horizontal runs and the number of vertical (transposed) runs. The computation time for both the methods is almost identical. © 1999 IEEE.

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VLSI solution for broadband multimedia networks

VLSI solution for broadband multimedia networks

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Annual Conference of Industrial Electronics Society

作者： F.F. Dai C.-H.J. Wu J.D. Irwin Hughes Network Systems Germantown MD USA Department of Electrical and Computer Engineering Aubum University AL USA

Broadband networks are indispensable for multimedia applications over the emerging Internet and Intranet. The very large scale integration (VLSI) has become a critical factor for cost reduction and performance improvement in broadband communication systems. In this paper, we study all kinds of VLSI technologies and show the optimal partition of the system functionality based upon the available VLSI processings. We demonstrate that the VLSI can provide the best solution for the performance, cost and quality of broadband networks.

关键词： Very large scale integration Broadband communication network synthesis CMOS digital integrated circuits CMOS process Costs CMOS integrated circuits Communication systems Application specific integrated circuits Baseband

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Blind linear equalization for GSM signals in a mobile environment

Blind linear equalization for GSM signals in a mobile enviro...

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IEEE Conference on Wireless Communications and networking

作者： Ge Li Zhi Ding Hughes Network Systems Germantown MD USA Department of Electrical and Computer Engineering University of Iowa Iowa IA USA

We investigate the application of blind adaptive equalizers in GSM wireless communication systems. Based on a single-input two-output linear approximated model, a diversity based constant modulus algorithm (CMA) and super-exponential algorithm (SEA) adaptive equalizers are implemented to GSM systems without additional antennas. These diversity based CMA and SEA equalizers are robust to channel order mismatch that cannot be overcome by SOS blind channel algorithms. They are also applicable to time-variant mobile channels due to utilization of statistical information from the entire burst. The condition for the adaptive equalizers to converge is given. All simulation results are based on a more practical wireless channel model that is quasi-time-variant (piecewise time-invariant).

关键词： Blind equalizers GSM Adaptive equalizers Linear approximation Fading Wireless communication Robustness Nonlinear filters Binary phase shift keying Intelligent networks

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New blind/semi-blind equalization algorithms for GSM systems

New blind/semi-blind equalization algorithms for GSM systems

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IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

作者： Ge Li Zhi Ding Hughes Network Systems Germantown MD USA Department of Electrical and Computer Engineering University of Iowa Iowa IA USA

We propose a GSM channel identification algorithm based on the decision feedback of the derotation-based constant modulus (DB-CMA) equalizer. By using the entire DB-CMA equalizer output as the reference "training", the channel impulse response can be more accurately identified for sequence estimation. We also propose a new semi-blind channel identification method. Based on the blind subspace method, a shorter training sequence is combined with "reliable" subspace information for channel identification with lower sensitivity to channel order mismatch and robustness to common zeros among diversity subchannels. Both methods are based on an approximated linearization of GMSK modulation and its single-input two-output model resulted from a derotation scheme. Overall improvement in the system efficiency is achieved.

关键词： Blind equalizers GSM Least squares approximation Feedback Linear approximation Transmitters Nonlinear filters Viterbi algorithm Equations Maximum likelihood estimation

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High performance distributed objects using caching proxies for large scale applications

High performance distributed objects using caching proxies f...

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International Symposium on Distributed Objects and Applications

作者： P. Martin V. Callaghan A. Clark BT Laboratories Network Intelligence Engineering Centre Suffolk UK Department of Computer Science and Electronic Systems Engineering University of Essex Colchester UK

Initial implementations of middleware based on standards such as CORBA have concentrated on host and language transparency issues in order to demonstrate interoperability. They have largely adopted a no-replication approach and have frequently neglected performance-at-scale issues. This has led to continuing deployment of either non-scalable full-replication approaches or ad-hoc messaging-based middleware for applications such as intelligent networks, WWW applications and collaborative virtual reality. These applications require millions of objects globally distributed across hundreds of hosts and demand a very high throughput of low-latency method invocations. Our main research aim is to be able to reason about the performance of such applications when using scalable partial-replication and object-oriented approaches to middleware. Our approach is to use a simulator to explore potential design and implemention choices. Our current simulator-driven design, called "MinORB", has been fully implemented and tested. MinORB supports scalable high performance by a combination of techniques, including weak and application-specified consistency and partial replication using fine-grained proxy caching. Experimental results show that our work compares very favourably with other leading implementations, such as OmniORB. Scalability is unparalleled, with up to 1,000,000,000 objects per address space, a maximum throughput of 42,000 invocations per second and service times as low as 4 ms.

关键词： Large-scale systems Throughput Intelligent networks Delay World Wide Web Application software Middleware Collaboration Scalability Heat engines

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Relative convergence of the cascade RLS with subsection adaptation algorithm

Relative convergence of the cascade RLS with subsection adap...

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Asilomar Conference on Signals, systems & computers

作者： G. Zakaria A.A. Beex The Bradley Department of Electrical and Computer Engineering VIRGINIA TECH Systems Group-DSP Research Laboratory Blacksburg VA USA Hughes Network Systems Germantown MD USA

We analyze the convergence behavior of the CRLS-SA algorithm for inverse filtering. The CRLS-SA is a cascade adaptive filter based on the RLS algorithm, with each section adapted independently based on global minimization. The subsection adaptation results in reduced computational complexity. The rate of convergence is evaluated based on the convergence time constant defined as the ratio of condition number and sensitivity. The smaller the convergence time constant, the faster the structure converges. Analysis and simulation explain and show that CRLS-SA exhibits faster convergence than the direct form RLS adaptive filter for speech type signals.

关键词： Convergence Resonance light scattering Adaptive filters Speech analysis Algorithm design and analysis Filtering algorithms Minimization methods Computational complexity Signal analysis Computational modeling

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A memory efficient method for fast transposing run-length encoded images

A memory efficient method for fast transposing run-length en...

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International Conference on Document Analysis and Recognition

作者： V. Misra J.F. Arias A.K. Chhabra Department of Electrical & Computer Engineering University of Massachusetts Amherst MA USA Advanced Technology Bell Atlentic Network Systems Engineering White Plains NY USA

关键词： Image coding Image processing Pixel engineering drawings Read only memory Document image processing Morphological operations

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Fault tolerant real-time connection admission control for mission critical applications over ATM-based networks

Fault tolerant real-time connection admission control for mi...

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IEEE International Conference on Embedded and Real-Time Computing systems and Applications (RTCSA)

作者： B. Devalla R. Bettati W. Zhao IP & ATM Network Planning Nortel Networks Systems Engineering Richardson TX USA Department of Computer Science Texas A and M University College Station TX USA

We present methods to provide fault-tolerant real-time communication over ATM networks. Specifically, we are concerned with messages that have to be delivered by their deadlines even in the presence of faults. Connection-oriented communications service is well-suited for mission critical applications that demand delay guarantees. A critical part of connection oriented communication is the design of a connection admission control algorithm. We develop innovative fault tolerant real-time connection admission control algorithms that use an integrated spatial and temporal redundancy scheme and provide algorithms that determine the appropriate redundancy parameters. To aid delay analysis, we first develop a generic traffic model to describe the traffic of individual connections in the network. We then develop an analytical method to derive the end-to-end delay bounds taking into account the impact of faults.

关键词： Fault tolerance Admission control Mission critical systems Delay Quality of service Real time systems Algorithm design and analysis Redundancy Application software Telecommunication traffic

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Buffer requirements for ABR traffic using congestion control mechanism

Buffer requirements for ABR traffic using congestion control...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： E.S. Atieh M.M. Matalgah M.M. Guizani Sprint-Network Planning and Design Overland Park KS USA Sprint PCS-Technology and Advanced Systems Development Lenexa KS USA Electrical & Computer Engineering Department University of Missouri Kansas City Kansas City MO USA

In this paper, we perform analysis and simulation for the calculation of the minimum buffer size requirements for Available Bit Rate (ABR) traffic. We utilized a recently developed feedback flow control congestion mechanism. This mechanism belongs to a class of Backpressure (BP) algorithms. It ensures no data loss and operates based on simple "stop" and "start" signals. In our analysis, a feedback scheme on multiple ABR connections is used. Two buffering approaches are analyzed: (1) A Dedicated Approach; in which the flow control mechanism is applied independently for each of the connections. Thus, each connection is provided with its own buffer. (2) A Shared Approach; in which there will be some form of buffer sharing among the ABR connections. We studied the effects of changing the distance between nodes (connection length), number of connections, and the peak rate of each connection on buffer requirements using the two approaches.

关键词： Bit rate Delay Asynchronous transfer mode Communication system traffic control Electronic mail Quality of service Application software Feedback Telecommunication traffic Bandwidth

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Integrated Optical Time-division-multiplexer based on Planar Lightwave Circuit

Integrated Optical Time-division-multiplexer based on Planar...

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Optical Fiber Communication Conference, OFC 1999

作者： Takara, H. Shake, I. Kawanishi, S. Yamabayashi, Y. Magari, K. Tohmori, Y. Takiguchi, K. Ogawa, I. Himeno, A. NTT Optical Network Systems Laboratories Y807A 1-1 Hikari-no-oka Kanagawa Yokosuka239-0847 Japan NTT Opto-electronics Laboratories 3-1 Morinosato Wakamiya Kanagawa Atsugi243-0198 Japan NTT Opto-electronics Laboratories 162 Tokai Naka-gun Ibaraki319-1193 Japan Electrical & Computer Engineering Department University of California Santa BarbaraCA93106 United States

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