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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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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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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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2-D IIR digital filters for deinterlacing of video signals

2-D IIR digital filters for deinterlacing of video signals

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： Q.S. Gu L.C.K. Lee M.N.S. Swamy Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

Investigates the application of 2D IIR digital filters for deinterlacing of video signals. A special class of diamond filters is presented, which employs only two coefficients and has approximately zero-phase response. The implementation of this filter is very efficient and the stability is guaranteed even under finite arithmetic conditions. This filter is tested with a group of sequences. Very promising results are obtained.< >

关键词： Digital filters Interpolation Finite impulse response filter IIR filters TV HDTV signal resolution Motion detection Image resolution Transfer functions

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An analytical method for the frequency-domain least square design of centro-symmetric 2-D FIR filters

An analytical method for the frequency-domain least square d...

引用

International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： W.-P. Zhu M.O. Ahmad M.N.S. Swamy Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada Division of Digital Signal Processing Department of Radio Engineering South-East University Nanjing Jiangsu China

The authors develop an analytical technique for the design of centrosymmetric two-dimensional FIR (finite impulse response) filters by formulating a frequency-domain least-square approximation problem. A study of some of the properties of the matrices involved in this design problem leads to an optimal analytical solution for the filter co-efficients. This solution permits fast calculation of the coefficients directly from the given frequency-response specifications without requiring either optimization procedures or matrix inversion operations. It is shown through design examples that the design time and computational complexity using the proposed technique are significantly lower than those for the usual optimization techniques.< >

关键词： Frequency domain analysis Least squares methods Finite impulse response filter Frequency response Matrix decomposition Digital signal processing Design engineering signal analysis signal design Least squares approximation

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Performance of a direct sequence code division multiple access cellular network

Performance of a direct sequence code division multiple acce...

引用

IEEE Southeastcon

作者： M.W. Twiggs D.B. Koch Communications Infod Signal Proc Department of Electrical and Computer Engineering University of Tennessee Knoxville TN USA Communications Information and Signal Processing (CISP) Group Department of Electrical and Computer Engineering University of Tennessee Knoxville TN USA

A DS/CDMA (direct-sequence code division multiple access) system using BPSK (binary phase shift keying) modulation is simulated to determine the bit error probabilities for various numbers of users with a processing gain close to that of a cellular network. The results are compared to results obtained using the Gaussian approximation equations. The results obtained are to the feasibility of a DS/CDMA cellular network. It is concluded that DS/CDMA cellular networks appear to offer higher subscriber capacities than existing analog or TDMA (time division multiple access) formats. In addition, DS/CDMA offers additional advantages such as inherent privacy through the use of spreading codes and the ability to combat problems such as multipath fading and narrowband noise.< >

关键词： Direct-sequence code-division multiple access Multiaccess communication Land mobile radio cellular systems Binary phase shift keying Time division multiple access Phase modulation Modulation coding Error probability Gaussian approximation Equations

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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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An evaluation of time-frequency localization in transforms and filter banks

An evaluation of time-frequency localization in transforms a...

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Y. Liu A.N. Akansu New Jersey Institute of Technology Department of Electrical and Computer Engineering Center for Communications and Signal Processing Research University Heights Newark NJ USA

The authors derive the discrete-time uncertainty and evaluate the time-frequency localizations of orthogonal bases. They measure and compare the localization features of known block transforms, filter banks, and wavelet filters. It is emphasized that the time and frequency behaviors of basis functions should be considered simultaneously in the design of block transforms and filter banks for further improvements in their applications.< >

关键词： Time frequency analysis Channel bank filters Filter bank Discrete transforms Uncertainty Discrete wavelet transforms Frequency domain analysis Fourier transforms signal processing Bandwidth

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Registration in Multi-Sensor Data Fusion and Tracking

Registration in Multi-Sensor Data Fusion and Tracking

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American Control Conference (ACC)

作者： Derek C. Cowley Bahram Shafai Communications and Digital Signal Processing (CDSP) Center for Research and Graduate Studies Department of Electrical and Computer Engineering Northeastern University Boston MA USA

This report presents a simple and direct method of solving the registration problem associated with multiple radar tracking. The registration proceedure is split into two distinct parts that are independent from one another. The first part is a deterministic tranformation from the measurement domain to the measurement error or bias variable domain, and the second part is a filtering to track the actual value of the bias variables. Only the transformation part will be covered.

关键词： Radar tracking Radar antennas Radar measurements Noise reduction Face detection Radar detection Object detection Noise cancellation Position measurement Iron

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Multichannel spectral analysis for tube leak detection

Multichannel spectral analysis for tube leak detection

引用

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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