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Progressive optimality in hierarchical filter banks

Progressive optimality in hierarchical filter banks

引用

IEEE International Conference on Image processing

作者： M.V. Tazebay A.N. Akansu Department of Electrical and Computer Engineering Center for Communications and Signal Processing Research New Jersey Institute of Technology Newark NJ USA

The concept of progressive optimization is proposed for the design of hierarchical subband transforms. The time and frequency properties of the product filters in subband trees are discussed and evaluated. It is shown that the performance improvements in image coding are possible by using different PR-QMF banks at different nodes of a subband tree.< >

关键词： Channel bank filters Filter bank Displays signal processing signal design Image coding Prototypes Time frequency analysis Design optimization Bandwidth

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Progressive optimization of time-frequency localization in subband trees

Progressive optimization of time-frequency localization in s...

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IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis

作者： M.V. Tazebay A.N. Akansu Department of Electrical and Computer Engineering Center for Communications and Signal Processing Research New Jersey Institute of Technology Newark NJ USA

The time and frequency localizations of the product subband filter functions in tree structures are addressed and evaluated in this paper. The concept of progressive optimality is proposed as a new design approach. It is shown that the performance improvements are possible by using different PR-QMF banks at different nodes of a subband tree.< >

关键词： Time frequency analysis Filter bank Tree data structures Discrete wavelet transforms Wavelet analysis Prototypes Displays Bandwidth signal resolution Fourier transforms

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Reduced-state Viterbi equalization using state partitioning

Reduced-state Viterbi equalization using state partitioning

引用

1994 IEEE GLOBECOM. Communications: Communications Theory Mini-Conference Record,

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 reduced-state sequence estimator for linear dispersive channels is described. The technique is based on partitioning the set of all possible channel states in a way that defines a trellis with fewer states resulting in reduced complexity. The outcome of the new technique results is a generalization of trellises previously obtained in Duel-Hallen and Heegard. While the approach in Duel-Hallen and Heegard results in power of two-state trellises, the new technique generates trellises with an arbitrary number of states. Therefore, the set partitioning approach described in the present paper provides a better performance/complexity tradeoff. The Viterbi algorithm (VA) is used to search for the best path through the reduced state trellis.

关键词： Viterbi algorithm Decision feedback equalizers Maximum likelihood estimation Power generation signal processing Additive noise Gaussian noise Intersymbol interference Maximum likelihood detection Error analysis

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Design of limit-cycle-free recursive transfer functions for fixed-point direct form implementation

Design of limit-cycle-free recursive transfer functions for ...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： T.I. Laakso M. Lang T. Saramaki Nokia Research Center Helsinki Finland Electrical and Computer Engineering Department Rice University TX USA Signal Processing Laboratory Tampere University of Technology Tampere Finland

An approach for the design of limit-cycle-free digital fixed-point filters is proposed. By constraining the transfer function already in the design phase, it is guaranteed that the filter will be free from limit cycles and overflow oscillations in the direct form implementation. The design strategy also guarantees low roundoff noise. The proposed approach is illustrated with design examples. The examples show that typically a 50-100% increase in the filter order (as compared to standard elliptic design) is needed for the limit-cycle-free implementation of a lowpass filter with the direct form (DF) structure. Since the DF structure is very efficient to implement in signal processors, the proposed filters are very attractive for such environment, whereas dedicated filter structures (wave digital, state-space, etc.) easily result in a 3 to 4-fold implementation complexity.< >

关键词： Transfer functions Limit-cycles Electronic mail Digital filters Stability criteria Algorithm design and analysis Design engineering Laboratories Elliptic design signal processing

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Pipeline processors for fast trigonometric transforms

Pipeline processors for fast trigonometric transforms

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Asilomar Conference on signals, Systems & computers

作者： D. Akopian I. Egiazarian S. Agaian J. Astola Signal Processing Laboratory Tampere University of Technology Tampere Finland Electrical Engineering Department Tufts University Medford MA USA

Pipeline processors are proposed for computation of fast discrete trigonometric transforms (DTT), particularly for cosine (DCT) and sine (DST) transforms. The transform time is O(N), where N=2/sup n/ is the length of the input data vector. Because of the using the internal properties of the considered transforms, the numbers of adders, multipliers and registers are reduced when compared with the pipeline structures for fast Fourier transform and direct DCT.< >

关键词： Pipelines Discrete transforms Discrete cosine transforms Fourier transforms Image coding signal processing Discrete Fourier transforms Arithmetic Karhunen-Loeve transforms signal processing algorithms

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A unified approach to implementation of stack filters

A unified approach to implementation of stack filters

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Asilomar Conference on signals, Systems & computers

作者： J. Astola D. Akopian S. Agaian O. Vainio Signal Processing Laboratory Tampere University of Technology Tampere Finland Electrical Engineering Department Tufts University Medford MA USA

New stack filter architectures are proposed. Known architectures are considered from new positions and combined to obtain new structures with suitable complexities and throughputs. It is shown that all stack filters can be used without changes when the input data is represented in one of the binary lexicographic codes. Stack filters are also proposed for the cases where the data are represented in multiple-value lexicographic codes. The class of pipeline-parallel structures for common stack filters is simple and modular in structure, and suitable for VLSI implementation. The time-area complexity of the proposed filters is O(k), where k is the number of bits in the input signals.< >

关键词： Filters Throughput signal processing Laboratories Very large scale integration Boolean functions Arithmetic Circuits Sorting Graphics

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Static program decomposition among machines in an SIMD/SPMD heterogeneous environment with non-constant mode switching costs

Static program decomposition among machines in an SIMD/SPMD ...

引用

1995 Heterogeneous Computing Workshop, HCW 1994

作者： Watson, Daniel W. Antonio, John K. Siegel, Howard Jay Atallah, Mikhail J. Department of Computer Science Utah State University LoganUT84321-4205 United States Parallel Processing Laboratory School of Electrical Engineering Purdue University West LafayetteIN47907-1285 United States Computer Sciences Department Purdue University West LafayetteIN47907-1398 United States

ISBN: (纸本)0818655925

The problem of minimizing the execution time of programs within a heterogeneous environment is considered. Different computational characteristics within a parallel algorithm may make switching execution from one machine to another beneficial;however, the cost of switching between machines during the execution of a program must be considered. This cost is not constant, but depends on data transfers needed as a result of the move. Therefore, determining a minimum-cost assignment of machines to program segments is not straightforward. A previously presented Block-Based Mode Selection (BBMS) approach is used as a basis to develop a heuristic method for assigning machines to program segments of data-parallel algorithms. Simulation results of parallel program behavior using the heuristic indicate that good assignments are possible without resorting to exhaustive search techniques. © 1994 IEEE.

关键词： Heuristic methods

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Bayesian techniques for equalization of rapidly fading frequency selective channels

Bayesian techniques for equalization of rapidly fading frequ...

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IEEE Conference on Vehicular Technology (VTC)

作者： Gen-Kwo Lee M.P. Fitz S.B. Gelfand Vides Signal Processing Department Computer & Communication Research Laboratory Industrial Technology and Research Institute Hsinchu Taiwan School of Electrical Engineering Purdue University West Lafayette IN USA

This paper applies the Bayesian conditional decision feedback estimator (BCDFE) to rapidly fading frequency selective channels. The BCDFE is a model-based deconvolution algorithm which jointly estimates the transmitted data and channel parameters. The BCDFE applies joint symbol-by-symbol MAP demodulation and channel estimation to equalize channels, and consequently provides robust performance in rapidly fading channels. We provide a brief derivation of the BCDFE and characterize the performance on the land mobile radio channel. We assess the BCDFE's principle design characteristics and the resulting performance in both transient and steady-state operation. The effects of delay spread, Doppler spread, and co-channel interference on the BEP performance are also presented. The BCDFE demonstrates many of the desirable characteristics of an equalizer for mobile radio.< >

关键词： Bayesian methods Fading Frequency estimation Land mobile radio Feedback Deconvolution Demodulation Channel estimation Robustness Steady-state

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Statistics of the phase delays between array receivers estimated from the eigendecomposition of the signal correlation matrix

Statistics of the phase delays between array receivers estim...

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

作者： J.J. Smith Y.H. Leung A. Cantoni Adaptive Signal Processing Laboratory Department of Electrical and Electronic Engineering University of Western Australia Crawley WA Australia Adaptive Signal Processing Laboratory. Australian Telecommunications Research Institute Curtin University of Technology Bentley WA USA

The eigenvector method for estimating the positions of the receivers of an ocean-towed array is based on the eigendecomposition of the array signal correlation matrix to find the phase delays between the array receivers. This paper derives the mean, variance and covariance of the phase delays when the correlation matrix is estimated from receiver data. It is shown that the variance of the relative phase delays is inversely proportional to the number of snapshots and SNR but relatively independent of the size of the correlation matrix. The theoretical derivations are supported by numerical simulations.< >

关键词： Delay estimation Phased arrays Statistics Phase estimation Covariance matrix Eigenvalues and eigenfunctions Adaptive signal processing Laboratories Frequency signal to noise ratio

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Traffic management of a satellite communication network using mean field annealing

Traffic management of a satellite communication network usin...

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International Joint Conference on Neural Networks (IJCNN)

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

The performance of non-hierarchical circuit switched networks at moderate load conditions is improved when alternate routes are made available. However, alternate routes introduce instability under heavy and overloaded conditions, and under these load conditions network performance is found to deteriorate. To alleviate this problem, a control mechanism that reserves a traction of the capacity of each link for direct routed calls is used. In this paper, a traffic management scheme is developed to enhance the performance of a mesh-connected, circuit-switched satellite communication network. The network load is measured and the network is continually adapted by reconfiguring the map to suit the current traffic conditions. The reconfiguration of the network is done by properly allocating the capacity of each link and placing an optimal reservation on each link. The optimization is done by using a neural network-based optimization technique called mean field annealing. The simulation results show that this method of traffic management performs better than pure dynamic routing with a fixed configuration.< >

关键词： Telecommunication traffic Satellite communication Traffic control Switching circuits Communication switching Communication system control Communication system traffic control Current measurement Neural networks Annealing

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