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Achievability of combined GOS requirements in broadband networks

Achievability of combined GOS requirements in broadband netw...

引用

IEEE International Conference on Communications (ICC)

作者： Y.-H. Jeon I. Viniotis Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

Conservation laws to investigate the achievability of performance objectives in broadband networks are developed. Conservation laws for delay presented so far assumed infinite buffer size. No conservation laws for delay with finite buffer were established. In the present work, it is shown that the conservation law for combining scheduling and pushout mechanisms is represented as a two-dimensional region, rather than as a line, in the two-dimensional plane. In this case, the classical mixing strategies of E. Gelenbe and I. Mitrani (1980) may not be used to achieve the performance objectives. Therefore, there is a need for some other control strategies in order to satisfy both delay and loss performance objectives. On the basis of these conservation laws, the authors provide a dynamic queueing discipline that achieves the specified objectives, if the objectives can be satisfied, and treats the various workload classes fairly, if they cannot.< >

关键词： Intelligent networks Broadband communication Delay Traffic control Propagation losses Loss measurement Scheduling Buffer storage Communication system control signal processing

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Simulation of digital communication systems using a stochastically optimised importance sampling technique

Simulation of digital communication systems using a stochast...

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Proceedings of GLOBECOM '93. IEEE Global Telecommunications Conference

作者： W.A. Al-Qaq M. Devetsikiotis J.K. Townsend Center for Communications and Signal Processing Department of Electrical & Computer Engineering North Carolina State University Raleigh NC USA

Importance sampling (IS) techniques can substantially accelerate bit error rate (BER) estimation using Monte Carlo (MC) simulation provided that the IS parameters specifying the simulation probability density function (PDF) are carefully chosen. We present an IS optimization algorithm based on stochastic gradient techniques. The formulation of the stochastic gradient descent (SGD) algorithm presented in this paper is quite general and system-independent, and its applicability is not restricted to a specific PDF or biasing scheme. The generality and effectiveness of the SGD algorithm are demonstrated by applying it to the problem of efficiently simulating a communication system with diversity combining, slow nonselective Rayleigh fading channel and noncoherent envelope detection.< >

关键词： Digital communication Monte Carlo methods Bit error rate Diversity reception Acceleration Estimation error Probability density function Stochastic processes Stochastic systems Fading

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Edge-preserving frequency selective filters

Edge-preserving frequency selective filters

引用

IEEE Winter Workshop on Nonlinear Digital signal processing

作者： R. Soininen I. Defee Singal Processing Laboratory Department of Electrical Computer Engineering Tampere University of Technology Tampere Finland

Linear filters can be designed to any frequency Specification but they exhibit smoothing of localized signal features. In this paper a new filtering scheme is introduced, which is frequency selective but at the same time does not blurr the signal. This scheme is based on using the ordering of samples together with frequencey specifications. Frequency specifications are used to detect the desired frequencies. Information about the samples ordering is then used to decide which filter or if any filter is to be applied on the signal.

关键词： Frequency Filters Filtering Algorithm design and analysis Ear Passband Testing Erbium Nonlinear distortion Programmable control

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Shaping of virtual path traffic for ATM B-ISDN

Shaping of virtual path traffic for ATM B-ISDN

引用

IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： L.K. Reiss L.F. Merakos Communications and Digital Signal Processing Research Center Electrical and Computer Engineering Department North Eastern University Boston MA USA

Two mechanisms for shaping private network traffic in asynchronous transfer mode (ATM) broadband ISDN (B-ISDN) are proposed and analyzed. The shapers utilize the information about the network policer and implement a form of priority service to assure satisfactory levels of cell loss and delay for traffic streams with differing service requirements multiplexed into a policed ATM virtual path. The performance of the shapers is analyzed using stochastic-fluid methods and Markov-modulated models of bursty traffic sources. The numerical results illustrate the performance benefits and flexibility obtainable through the use of the proposed shapers in comparison to a simple policed path without traffic shaping.< >

关键词： B-ISDN Virtual private networks Traffic control Telecommunication traffic Communication system traffic control Aggregates Shape control Contracts Tagging Delay

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Blind decision feedback equalization using the decorrelation criterion

Blind decision feedback equalization using the decorrelation...

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Proceedings of GLOBECOM '93. IEEE Global Telecommunications Conference

作者： R.E. Kamel Y. Bar-Ness Center for Communications and Signal Processing Research Department of Electrical & Computer Engineering New Jersey Institute of Technology Newark NJ USA

A new blind equalization algorithm is presented which is based on decorrelating the equalizer's output. The algorithm is used with a decision feedback structure. The performance of the new equalizer on nonrecursiv... 详细信息

关键词： Decision feedback equalizers Decorrelation Blind equalizers Data communication Intersymbol interference Frequency signal processing algorithms Finite impulse response filter Cost function Adaptive equalizers

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Improved method for parameter estimation of complex sinusoids in noise

Improved method for parameter estimation of complex sinusoid...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： N.K. Bose Department of Electrical and Computer Engineering The Spatial & Temporal Signal Processing Center Pennslyvania State University University Park PA USA

Using the theory of resultants/subresultants (inner determinants), a set of necessary conditions as well as another set of necessary conditions as well as another set of necessary and sufficient conditions, which are nonlinear functions of the polynomial coefficients, are obtained for all its roots to lie on the unit circle and be distinct from each other. The results have potential for improvement over previous methods for estimating parameters of sinusoids in noise where the constraints imposed provide only necessary conditions and are linearly related to the polynomial coefficients.< >

关键词： Parameter estimation Polynomials Additive noise Random variables Sufficient conditions Background noise Documentation Discrete transforms Nonlinear equations Frequency

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Multichannel spectral analysis for tube leak detection

Multichannel spectral analysis for tube leak detection

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IEEE Southeastcon

作者： Q. Wan D.B. Koch K. Morris Communications Information and Signal Processing Group Electrical and Computer Engineering DepartmentCommunications Information Signal Processing Group University of Tennessee Knoxville Knoxville TN USA Tennessee Valley Authority Chattanooga TN USA

Research to develop multichannel spectral analysis methods, including classical and parametric techniques, for tube leak detection in fossil-fueled power plant boilers is described. Acoustic analysis is employed to detect leaks. The main idea is to monitor the continuous noise environment of the furnace and to look for specific acoustic signatures produced by leaks. A signal spectrum is estimated using the LabVIEW software package. The coherence spectrum of 2-channel signals estimated by the autoregressive technique is shown.< >

关键词： Spectral analysis Leak detection Power generation Boilers Acoustic signal detection Monitoring Acoustic noise Working environment noise Furnaces Software packages

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Root-loci for periodic linear systems 25

Root-loci for periodic linear systems

引用

25th Southeastern Symposium on System Theory, SSST 1993

作者： Zhu, J. Vemula, S.K. Louisiana State Univ. Electrical and Computer Engineering Department Baton RougeLA70803 United States Louisiana State Univ. Remote Sensing Aind Image Processing Laboratory Baton RougeLA70803 United States

ISBN: (纸本)0818635606

According to the Floquet theory, an nth-order linear periodic (LP) system of the form yn+αn(t) y/sup n-1/+...+α2(t)dy(t)/dt+α1(t)y=0 can be transformed into an equivalent linear time-invariant (LTI) system whose characteristic roots, known as Floquet characteristic exponents (FCEs), determine the stability of the LP system. A technique for obtaining an approximation of the characteristic equation for the FCEs is developed. Parametric loci of the FCE, similar to the root locus plot for a LTI system, are then developed for the LP system. The technique is exemplified by 2nd-order LP systems. The FCE loci are useful in the stability analysis and control design for LP systems. © 1993 IEEE.

关键词： Root loci

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Helicopter gearbox fault detection and diagnosis using analog neural networks

Helicopter gearbox fault detection and diagnosis using analo...

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Asilomar Conference on signals, Systems & computers

作者： P.T. Monsen E.S. Manolakos M. Dzwonczyk Atlantic Aerospace Electronics Corporation Waltham MA USA Communications and Digital Signal Processing Center Electrical And Computer Engineering Department Northeastern University Boston MA USA Information Systems Laboratory Department of Electrical Engineering University of Stanford USA

This paper summarizes the results of two neural hardware implementations of a helicopter gearbox health monitoring system (HMS). Our first hybrid approach and implementation to fault diagnosis is outlined, and our results are summarized using three levels of fault characterization: fault detection (fault or no fault), classification (gear or bearing fault), and identification (fault sub-classes). Our second all-analog implementation exploits the ability, of analog neural hardware to compute the discrete Fourier transform (DFT) as a pre-processor to a neural classifier. Our hardware results compare well with previously published software simulations.< >

关键词： Helicopters Fault detection Fault diagnosis Hardware Discrete Fourier transforms Monitoring Gears Analog computers Computational modeling

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Tractable analysis of a finite capacity polling system under bursty and correlated ATM arrivals

Tractable analysis of a finite capacity polling system under...

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IEEE International Conference on Communications (ICC)

作者： Y.F. Jou A.A. Nilsson F. Lai Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA IBM NC USA

The authors consider the mean delay and the cell loss probability that bursty and correlated arrivals incur in an ATM (asynchronous transfer mode) switching module which can be modeled as a finite-capacity polling system with nonexhaustive cyclic service. The arrival process to each input port of the system is modeled by a Markov modulated Bernoulli process (MMBP) which is able to describe the bursty and correlated nature of the ATM traffic. A practical polling system with finite capacity does not lend itself to an exact solution. The authors introduce a tractable approach to providing an analytical approximation. It is shown that both the mean delays and the cell loss probabilities obtained from this analysis provide accurate estimates.< >

关键词： Asynchronous transfer mode Switches Traffic control Telecommunication traffic Capacity planning Delay estimation Queueing analysis signal processing Communication switching Joining processes

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