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Stochastic methods for transistor size optimization of CMOS VLSI circuits 4th

Stochastic methods for transistor size optimization of CMOS ...

引用

International Conference on Evolutionary Computation - 4th International Conference on Parallel Problem Solving from Nature, PPSN 1996

作者： Rogenmoser, Robert Kaeslin, Hubert Blickle, Tobias Integrated Systems Laboratory Switzerland Computer Engineering and Networks Laboratory ETH Zürich Gloriastr. 35 Zürich8092 Switzerland

ISBN: (纸本)354061723X

The performance of a CMOS circuit depends heavily on its transistor sizes. We have tested a standard optimizer, a Monte Carlo scheme and a method based on Genetic Algorithms combined with very accurate SPICE simulations to automatically optimize transistor sizes of three different digital CMOS circuits. While the standard optimizer and the Monte Carlo scheme are advantageous for small circuits, the method based on Genetic Algorithms was found to be more stable for larger circuits. © 1996, Springer-Verlag. All rights reserved.

关键词： Genetic algorithms

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High-quality prosodic modification of speech signals

High-quality prosodic modification of speech signals

引用

International Conference on Spoken Language, ICSLP

作者： B. Pfister Computer Engineering and Networks Laboratory TIK Speech Processing Group ETH Zurich Zurich Switzerland

The aim of the work was to develop a procedure that allows prosodic modifications of speech signals without impairing the quality. The developed procedure is based on the Fourier analysis/synthesis technique with several improvements on the analysis side, such as the analysis of signals with rapidly changing F/sub 0/ and the analysis of weak spectral components. Also for the modification of the short time spectrum and for the reconstruction of the speech signal some new methods have been introduced. The most important one, in terms of speech quality, is the method of phase compensation that limits the absolute time shift to half the pitch period. The developed procedure is used in our high quality text to speech synthesis system that is based on concatenation of prosodically modified diphones.

关键词： Speech synthesis Signal analysis Speech processing Signal synthesis Fourier transforms Signal processing Frequency estimation computer networks Laboratories Network synthesis

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Multimedia multipoint teleteaching over the European ATM pilot

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Proceedings of the 1996 International Zurich Seminar on Digital Communications, IZS'96

作者： Znaty, S. Walter, T. Brunner, M. Hubaux, J.-P. Plattner, B. TCOM Laboratory Telecommunications Services Group Swiss Federal Institute of Technology Lausanne Lausanne CH- 1015 Switzerland Computer Engineering and Networks Laboratory Swiss Federal Institute of Technology Ztirich (ETH) ETH Zentrum Gloriastr. 35 Zürich CH-8092 Switzerland

ISBN: (纸本)3540608958

In this paper, we present the design and implementation of the BETEUS (Broadband Exchange for Trans-European Usage) communication and application platform. BETEUS is a European project aiming at developing generic, stable, flexible and scalable communication and application platforms which provide support for a collaborative work environments. In terms of collaborative work, BETEUS concentrates on distributed classroom, tele-seminar, multimedia document archival and retrieval and tele-tutoring. The problems found during the realization of the BETEUS platform are outlined and the proposed solutions explained. The follow-up of BETEUS in Switzerland through the TELEPOLY project which concerns operational teleteaching between the two Swiss Federal Institutes of Technology (EPFL and ETHZ) is also presented. © Springer-Verlag Berlin Heidelberg 1996.

关键词： Teaching

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Minimizing the paging channel bandwidth for cellular traffic

Minimizing the paging channel bandwidth for cellular traffic

引用

International Conference on Universal Personal Communications

作者： C.U. Saraydar C. Rose Wireless Information Networks LABoratory Department of Electrical & Computer Engineering Rutgers University Piscataway NJ USA

We consider two mechanisms by which call setup requests are blocked in a mobile communication system: (1) The calling party may get impatient while the system is looking for the mobile unit and hang up. (2) There may be no channel available for call setup. These two blocking events can be combined to obtain a single request loss probability. For different arrival rates, number of cells in the paging area, impatience threshold, and number of voice channels available, we find the minimum paging rate required to meet some maximum loss probability criterion. We thus indirectly find the minimum paging bandwidth necessary to support a given number of voice channels.

关键词： Bandwidth Telecommunication traffic Traffic control Paging strategies Laboratories computer networks Mobile communication Communication channels Speech analysis

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Joint estimation of linear and nonlinear parameters using reduced sufficient statistics

Joint estimation of linear and nonlinear parameters using re...

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Asilomar Conference on Signals, Systems & computers

作者： R.A. Iltis Communication Networks Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

A new algorithm is presented for the joint estimation of linear and nonlinear parameters of a deterministic signal embedded in additive Gaussian noise. The algorithm is a modification of the reduced sufficient statistics (RSS) method introduced by Kulhavy (1990), which estimates the posterior parameter density via minimization of the cross-entropy. In the additive Gaussian noise measurement model, the modified RSS algorithm employs a parallel bank of least-squares type estimators for the linear parameters, coupled with an approximate minimum variance estimate for the nonlinear parameter. Simulation results are presented for the problem of estimating parameters of a chirp signal embedded in multipath, and the averaged squared error (ASE) of the parameter estimates is compared with the Cramer-Rao bound.

关键词： Statistics Parameter estimation Gaussian noise Vectors Additive noise Context modeling Communication networks Minimization methods Entropy Noise measurement

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Analysis of an access control mechanism for data traffic in an integrated voice/data wireless CDMA system

Analysis of an access control mechanism for data traffic in ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： A. Sampath N.B. Mandayam J.M. Holtzman Wireless Information Networks Laboratory (WINLAB) Department of Electrical and Computer Engineering Rutgers University Piscataway NJ USA

Mandayam and Boltzman (see MILCOM'95, San Diego, California, 1995) studied an access protocol for short data messages in an integrated voice/data CDMA system. It was assumed that voice traffic had priority and was less tolerant to delay than data traffic. Hence, the transmission of data traffic could be controlled to guarantee acceptable quality of service for voice. The data messages were of short duration and as a result, closed loop power control for them was not possible. The access protocol considered was an extension of a proposal by Viterbi (see Communications & Cryptography, p.42, 1994), which was for data-only systems. A slotted system was considered for data. At the end of every slot, the base station would control the transmission of data users by increasing/decreasing data permission probability. Measured QoS for voice was the criterion. An approximate model wherein a one-dimensional Markov chain of just the persistence state was considered and solved explicitly. Imperfect power control for voice was accounted for. In this work, the protocol is studied in greater detail. Stability of the protocol is investigated and critical data load values developed. The results also show that at high data loads additional admission control such as limited retries will be necessary to maintain stability. Simulation results show good agreement with the analysis, in the desirable operating regions.

关键词： Access control Access protocols Communication system traffic control Quality of service Power control Stability Multiaccess communication Delay Proposals Viterbi algorithm

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Paging strategies for highly mobile users

Paging strategies for highly mobile users

引用

IEEE Conference on Vehicular Technology (VTC)

作者： A. Yener C. Rose Wireless Information Networks Laboratory(WINLAB) Department of Electrical and Computer Engineering Rutgers University Piscataway NJ USA

In this work, we consider the problem of minimizing average paging cost and polling delay in a wireless system. It is assumed that users to be paged move according to a general motion process during the paging events. We find and evaluate the optimal sequential paging strategies for given maximum delay tolerance and compare our results to the classical paging strategy as well as the optimal strategies for stationary units (users).

关键词： Paging strategies Delay Cost function Bandwidth Laboratories Mobile communication Distribution functions Probability distribution Bismuth

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The Hamming associative memory and its relation to the exponential capacity DAM

The Hamming associative memory and its relation to the expon...

引用

International Conference on Neural networks

作者： M.H. Hassoun P.B. Watta The Computation and Neural Networks Laboratory Department of Electrical & Computer Engineering Wayne State University Detroit MI USA

We analyze the capacity of the Hamming associative memory and explore its relation to the exponential DAM (Chiueh and Goodman, 1991). In particular, it is shown that for a sufficiently large but finite radix, the expo... 详细信息

关键词： Associative memory Error correction computer networks Neural networks Laboratories Magnesium compounds computer architecture Hamming distance Sparse matrices

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Extensions of principal component analysis for nonlinear feature extraction

Extensions of principal component analysis for nonlinear fea...

引用

International Conference on Neural networks

作者： A. Sudjianto M.H. Hassoun G.S. Wasserman Department of Industrial & Manufacturing Engineering Wayne State University Detroit MI USA Department of Electrical & Computer Engineering Computation and Neural Networks Laboratory

One of the challenges of feature extraction is the ability to deal with complexities intrinsic to vast data sets in high-dimensional spaces. Multivariate methods are generally used to identify and eliminate unnecessary dimensions so as to encourage a more parsimonious representation of the data set while retaining the maximum information content possible. In this paper, we survey multivariate statistical approaches and introduce their neural network counterparts to perform linear and nonlinear dimensionality reduction. The usefulness of the various techniques is demonstrated using real-life data.

关键词： Principal component analysis Feature extraction Artificial neural networks Vectors computer aided manufacturing Neural networks Higher order statistics computer networks Statistical analysis Covariance matrix

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VLIW-processors under periodic real time constraints

VLIW-processors under periodic real time constraints

引用

IEEE International Conference on computer Design: VLSI in computers and Processors, (ICCD)

作者： J.-P. Theis L. Thiele Applied Microelectronics Laboratory Public Research Center Henri Tudor Luxembourg Luxembourg Computer Engineering and Networks Laboratory Swiss Federal Institute of Technology Zurich Switzerland

This paper deals with the cyclo-static (periodic) scheduling of iterative instruction sequences on VLIW-processor architectures, in the case when the period is imposed (periodic real time constraints). This problem naturally arises when designing VLIW-processor architectures as I/O interfaces between cyclo-static-processor arrays and the external world. Three important mapping problems related to periodic real time constraints are discussed, depending on the VLIW-processor resource constraints and optimization criteria that are considered. Precise conditions under which there exist cycle-static schedules are formulated. Whenever possible, we present systematic and optimal mapping methodologies with polynomial solution time. The starting point is thereby a novel description of iterative instruction sequences in the form of generalized directed acyclic graphs (DAG's). Finally, an innovative VLIW-processor architecture, called Extended Periodic Operation Model (EPOM) with distributed shift register file, which optimally fits into the mapping trajectory, is presented.

关键词： Clocks Processor scheduling Polynomials Flow graphs Hardware Coprocessors Microelectronics Shift registers Iterative methods Optimal control

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