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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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Adaptive two-stage detection scheme in synchronous two-user CDMA systems

Adaptive two-stage detection scheme in synchronous two-user ...

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MILCOM, Military Communications Conference

作者： Z. Siveski Y. Bar-Ness Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

An adaptive two-stage scheme for a synchronous, two-user CDMA environment with unknown received signal energies is presented. It consists of a tandem of the matched filter front-end followed by the interference canceler whose weights are adjusted by an adaptive algorithm. The error probability was evaluated analytically, and it was shown that the receiver provides satisfactory performance in the near-far scenarios.< >

关键词： Multiaccess communication Detectors Matched filters Interference cancellation Error probability Decorrelation Iterative algorithms Adaptive signal processing Adaptive algorithm Filter bank

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Adaptive map configuration and dynamic routing to optimize the performance of a satellite communication network

Adaptive map configuration and dynamic routing to optimize t...

引用

Proceedings of GLOBECOM '93. IEEE Global Telecommunications Conference

作者： S. Balasekar N. Ansari Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

It is demonstrated that the performance of a satellite network can be optimized by changing its facilities. A mesh-connected, circuit-switched satellite communication network is shown to perform better by adaptively reconfiguring the network by using simulated annealing to suit the current traffic conditions. Proper allocation of link capacities and placing an optimal reservation scheme for the network are crucial in this scheme. Routing is performed dynamically. Simulation results confirm these characteristics.< >

关键词： Routing Artificial satellites Switching circuits Satellite communication Communication switching Circuit simulation Telecommunication switching Communication system control Adaptive signal processing Simulated annealing

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Adaptive bandwidth reservation for traffic streams sharing an ATM virtual path

Adaptive bandwidth reservation for traffic streams sharing a...

引用

Proceedings of GLOBECOM '93. IEEE Global Telecommunications Conference

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

Adaptive, in-call, bandwidth reservation may be used to enhance bandwidth utilization in a policed ATM virtual path shared by traffic streams originated by many bursty sources. The mechanism is found to be effective when large changes in the aggregate traffic rate are slow in comparison to the feedback delay with which a requested change in the reserved rate is obtained. We present a model, based on Markov-modulated sources and stochastic fluid methods, for performance analysis of the proposed mechanism. The model, corroborated by simulations, is used to study the effects of feedback delay.< >

关键词： Bandwidth Aggregates Asynchronous transfer mode Feedback Delay effects Programmable control Adaptive control Telecommunication traffic Traffic control Communication system traffic control

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Achievable loss probabilities and buffer allocation policies in ATM nodes with correlated arrivals

Achievable loss probabilities and buffer allocation policies...

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

The authors consider the synthesis problem of a traffic control scheme based on conservation laws. They derive a conservation law for cell loss probabilities, for an ATM (asynchronous transfer mode) node with a finite buffer size and correlated arrival processes. Based on this law, they develop a buffer allocation (i.e., pushout) algorithm that meets a prespecified cell loss objective, if it can be satisfied, or treats the traffic classes "fairly", if it cannot. The algorithm is dynamic and requires no knowledge of arrival statistics.< >

关键词： Asynchronous transfer mode Traffic control Performance loss signal processing algorithms Performance analysis Loss measurement Telecommunication traffic High-speed networks Propagation delay signal processing

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On generalized adaptive neural filters with application to enhancing EKG signals

On generalized adaptive neural filters with application to e...

引用

Annual Northeast Bioengineering Conference

作者： Z.Z. Zhang N. Ansari Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

A class of nonlinear adaptive filters called generalized adaptive neural filters (GANFs) developed to generalize stack filters to a larger class of nonlinear filters and to outperform stack filters is discussed. They are based on the theory of stack filters and neural networks. It is shown that GANFs have better noise suppression performance than stack filters. The implementation of GANFs is discussed, and the theoretical analysis in regards to the performance of GANFs on EKG signal processing is also presented.< >

关键词： Adaptive filters signal processing Nonlinear filters Biomedical signal processing Gaussian noise Application software Additive white noise Neurons Adaptive signal processing Biomedical engineering

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Priority shaping of source traffic for ATM networks

Priority shaping of source traffic for ATM networks

引用

IEEE International Conference on Communications (ICC)

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

Priority shaping of aggregate source traffic is proposed for use with policed virtual paths in asynchronous transfer mode (ATM) networks. The shaping function, located between the traffic sources sharing the path and the network edge, acts as a self-policing mechanism augmented by a form of priority service to assure satisfactory levels of cell loss and delay for traffic streams with differing service requirements multiplexed into a single virtual path. Two versions of the shape are proposed, and their interaction with a virtual path policed by a leaky-bucket mechanism is discussed. The problem of optimization of shaper design parameters is considered.< >

关键词： Telecommunication traffic Aggregates Traffic control Asynchronous transfer mode Proposals Communication system traffic control Delay Digital signal processing computer networks Design optimization

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Comparative study of the generalized adaptive neural filter with other nonlinear filters

Comparative study of the generalized adaptive neural filter ...

引用

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

作者： H. Hanek N. Ansari Z.Z. Zhang Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

The generalized adaptive neural filter (GANF) is a new type of adaptable filter. The GANF relies upon neural functions to set up a filtering operation. The authors study a few of the possible neural networks which can be used in a GANF. The capabilities of the neural nets are examined and the filtering abilities of the GANF are obtained through simulation. While the GANF structure used is somewhat simplified, the filter is also compared with other nonadaptive filters. These filters provide a reference so that relative performance can be more realistically judged.< >

关键词： Adaptive filters Nonlinear filters Neurons Filtering Boolean functions Neural networks Adaptive signal processing signal processing Additive noise Additive white noise

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Recursive implementation of total least squares algorithm for image reconstruction from noisy, undersampled multiframes

Recursive implementation of total least squares algorithm fo...

引用

1993 IEEE International Conference on Acoustics, Speech, and signal processing

作者： N.K. Bose H.C. Kim H.M. Valenzuela Spatial and Temporal Signal Processing Center Department of Electrical and Computer Engineering Pennsylvania State University University Park USA

It is shown how the total least squares recursive algorithm for the real data FIR (finite impulse response) adaptive filtering problem can be applied to reconstruct a high-resolution filtered image from undersampled, noisy multiframes, when the interframe displacements are not accurately known. This is done in the wavenumber domain after transforming the complex data problem to an equivalent real data problem, to which the algorithm developed by C.E. Davila (Proc. ICASSP 1991 p.1853-6 of 1991) applies. The procedure developed also applies when the multiframes are degraded by linear shift-invariant blurs. All the advantages of implementation via massively parallel computational architecture apply. The performance of the algorithm is verified by computer simulations.< >

关键词： Least squares methods Image reconstruction signal processing algorithms Image resolution Filtering algorithms computer simulation Interpolation Filtering theory Least squares approximation Resonance light scattering

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Stochastic gradient techniques for the efficient simulation of high-speed networks using importance sampling

Stochastic gradient techniques for the efficient simulation ...

引用

Proceedings of GLOBECOM '93. IEEE Global Telecommunications Conference

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

To obtain large speed-up factors in Monte Carlo simulation using importance sampling (IS), the modification, or bias of the underlying probability measures must be carefully chosen. Analytical optimization techniques are generally ineffective, especially for queueing networks with bursty traffic. The authors present two stochastic gradient optimization techniques that lead to favorable IS parameter settings in the simulation of queueing networks, including queues with bursty traffic. Namely, they motivate and describe the stochastic gradient descent (SGD) algorithm, and the stochastic (important event) frequency ascent (SFA) algorithm. They demonstrate the effectiveness of their algorithms by applying them to the problem of estimating the blocking probability for a queue with two arrival streams, a modified interrupted Bernoulli stream and a Markov modulated Bernoulli stream with batch arrivals, deterministic service times, and finite capacity K (denoted by M-IBP+MMBBP/D/1/K). Speed-up factors of 1 to 6 orders of magnitude over conventional Monte Carlo simulation are achieved for the examples presented.< >

关键词： Stochastic processes High-speed networks signal processing algorithms Monte Carlo methods Telecommunication traffic Traffic control Communication networks Velocity measurement Frequency estimation Computational modeling

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