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User separation and frequency-time synchronization for the uplink of interleaved OFDMA

User separation and frequency-time synchronization for the u...

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Asilomar Conference on Signals, Systems & computers

作者： Zhongren Cao U. T'ureli Yu-Dong Yao Department of Electrical and Computer Engineering Stevens Institute of Technology Hoboken NJ USA Stevens Institute of Technology Hoboken NJ US Dept. of Electr. & Comput. Eng. Stevens Inst. of Technol. Hoboken NJ USA

This paper exploits the signal algebraic structure on the uplink of OFDMA system adopting interleaved carrier assignment scheme for synchronization and user separation. We first propose a subspace based method to estimate multiple user CFO deterministically using only one OFDMA block. Next, we derive a MMSE filter which can extract the ideal received signal waveform of all users individually to implement user separation and frequency synchronization at the same time. Time synchronization is carried out on single user's signal. The performance of the proposed algorithms is evaluated by simulations.

关键词： Frequency synchronization OFDM Multiple access interference Frequency domain analysis Frequency diversity Information systems Systems engineering and theory Filters Modeling Frequency division multiplexing

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IEEE International Conference on Image Processing

作者： J.G. Brankov N.P. Galatsanos Y. Yang M.N. Wernick Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL USA Illinois Institute of Technology Chicago IL US Dept. of Electr. & Comput. Eng. Illinois Inst. of Technol. Chicago IL USA

In this paper we present a new approach for clustering data. The clustering metric used is the normalized cross-correlation, also known as similarity, instead of the traditionally used Euclidean distance. The main advantage of this metric is that it depends on the signal shape rather than its amplitude. Under an assumption of an exponential probability model that has several desirable properties, the expectation-maximization (EM) framework is used to derive two iterative clustering algorithms. Numerical experiments are presented using simulated data in a dynamic positron emission topography study of the brain. Initial results demonstrate that the proposed method achieves better performance than several existing clustering methods.

关键词： Clustering algorithms Iterative algorithms Signal to noise ratio Maximum likelihood estimation Shape Radioactive decay Parameter estimation Euclidean distance Brain modeling Surfaces

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Subterahertz detection by high electron mobility transistors at large forward gate bias

Subterahertz detection by high electron mobility transistors...

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IEEE Conference on High Performance Devices

作者： Y. Deng W. Knap S. Rurayantsev R. Gaska A. Khan V. Ryzhii E. Kaminska A. Piotrowska J. Lusakowski M.S. Shur Electrical Computer and System Engineering Department Rensselaer Polytechnic Institute Troy New York USA GES CNRS-Universite Montpellier2 Montpellier France Rensselaer Polytechnic Institute Troy NY US Electr. Comput. & Syst. Eng. Dept. Rensselaer Polytech. Inst. Troy NY USA Sensor Electronic Technology Inc. Latham NY USA Department of Electrical and Computer Engineering University of South Carolina Columbia SC USA Computer Solid State Physics Laboratory University of Aizu Aizu-Wakamatsu Japan Institute of Electron Technology Warsaw Poland

The electron delay time associated with the electron propagation across the FET gate barrier layer under high positive gate bias is expected to induce a dynamic negative differential conductance and enhance the growth of plasma waves in the channel. This dynamic negative conductance is related to the phase shift between the current and voltage waveforms caused by the electron time delay during the electron tunneling through the gate barrier. We present experimental investigations of the plasma wave detector responsivity at 200 GHz and 600 GHz radiation for long channel AlGaAs/GaAs and AlGaInN/GaN based HEMTs at 8 K and 300 K. The appearance of detector response correlated with an increase of the injected gate current under the forward gate bias is reported for both types of the investigated devices. Our results confirm that a large gate current can enhance the excitation of plasma waves.

关键词： HEMTs MODFETs Electrons Plasma waves Delay effects Radiation detectors Propagation delay FETs Voltage Tunneling

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A systematic approach to seizure prediction using genetic and classifier based feature selection

A systematic approach to seizure prediction using genetic an...

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International Conference on Digital Signal Processing (DSP)

作者： M. D'Alessandro G. Vachtsevanos R. Esteller J. Echauz D. Sewell B. Litt Dept. of Electr. & Comput. Eng. Georgia Inst. of Technol. Atlanta GA USA Dept. of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Universidad Simón Bolívar Caracas Venezuela NeuroPace Inc. Sunnyvale CA NeuroPace Inc. Sunnyvale CA USA Dept. of Neurology and Biomedical Engineering 3West Gates Hospital of the University of Pennsylvania Philadelphia PA USA

Currently, there is no standard approach for evaluating the intracranial encephalographic signals for seizure prediction. This study evaluates the IEEG signals by applying a systematic approach to feature selection, classification and validation to predict seizures. After preprocessing and processing, a genetic algorithm selects reasonable features off-line from a preselected group of features to serve as inputs to the classifier based feature selection process. A probabilistic neural network is used to select the optimal feature vector using a reed forward sequential approach on the training data followed by classification. A study of four patients resulted in a 62.5% average probability of prediction and a block false positive rate of 0.2775 false positive predictions per hour.

关键词： Epilepsy Electroencephalography Biomedical engineering Biomedical computing Hospitals Data preprocessing Genetic algorithms Biological neural networks Neural networks Feedforward neural networks

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Recent advances in wavelength routing 28th

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28th International Conference on Current Trends in Theory and Practice of informatics, SOFSEM 2001

作者： Kaklamanis, Christos Computer Technology Institute Dept. of Computer Engineering and Informatics University of Patras Rio26500 Greece

ISBN: (纸本)9783540429128

We study the problem of allocating optical bandwidth to sets of communication requests in all–optical networks that utilize Wavelength Division Multiplexing (WDM). WDM technology establishes communication between pairs of network nodes by establishing transmitter– receiver paths and assigning wavelengths to each path so that no two paths going through the same fiber link use the same wavelength. Optical bandwidth is the number of distinct wavelengths. Since state–of–the–art technology allows for a limited number of wavelengths, the engineering problem to be solved is to establish communication between pairs of nodes so that the total number of wavelengths used is minimized;this is known as the wavelength routing problem. In this paper we survey recent advances in bandwidth allocation in tree– shaped WDM all–optical networks. We present hardness results and lower bounds for the general problem and the special case of symmetric communication. We also survey various techniques that have been developed recently, and explain how they can be used to attack the problem. First, we give the main ideas of deterministic greedy algorithms and study their limitations. Then, we show how to use various ways and models of wavelength conversion in order to achieve almost optimal bandwidth utilization. Finally, we show that randomization can help to improve the deterministic upper bounds. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Surveys

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Architectures and protocols for educational virtual environments

Architectures and protocols for educational virtual environm...

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2001 IEEE International Conference on Multimedia and Expo, ICME 2001

作者： Bouras, Ch. Tsiatsos, Th. Computer Technology Institute Greece Computer Engineering and Informatics Dept. Univ. of Patras Greece

ISBN: (纸本)0769511988

Shared or networked virtual environments are one of the most promising uses of the virtual reality technology. While a lot of research has been done in the area of multi-user virtual environments corresponding to the sharing of events very few research has been done on specific services and functionality. However both the requirements and the kind of the offered services affect significantly the design of a system. In this paper we present the main issues in the design of a platform to support the distant education process using networked virtual environments. We also introduce the term Educational Virtual Environments and their basic requirements. According to these requirements of the educational virtual environments we propose both a suitable architecture and a protocol for the interaction between the components of this architecture.

关键词： Network architecture

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The price of selfish routing 01

The price of selfish routing

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33rd Annual ACM Symposium on Theory of Computing

作者： Mavronicolas, Marios Spirakis, Paul Dept. of Computer Science University of Cyprus Nicosia CY-1678 Cyprus Dept. of Computer Engineering and Informatics University of Patras Computer Technology Institute 261 10 Patras Greece

ISBN: (纸本)9781581133493

The problem of routing in congested communication networks was studied. A noncooperative network consisting of a set of m parallel links within a game theoretic framework was considered for analysis. A collection of n network users each employing a mixed strategy to control assigned traffic was assumed. Both uniform and nonuniform link capacities were considered for routing traffic in order to minimize the maximum expected latency over all links.

关键词： Telecommunication traffic

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Optimal and approximate station placement in networks (With applications to multicasting and space efficient traversals) 18th

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18th Annual Symposium on Theoretical Aspects of computer Science, STACS 2001

作者： Galdi, Clemente Kaklamanis, Christos Montangero, Manuela Persiano, Pino Dipartimento di Informatica ed Applicazioni Università di Salerno BaronissiSA84081 Italy Computer Technology Institute Dept. of Computer Engineering and Informatics University of Patras Rio26500 Greece

ISBN: (纸本)9783540416951

In this paper we study the k-station placement problem (k- SP problem, in short) on graphs. This problem has application to efficient multicasting in circuit-switched networks and to space efficient traversals. We show that the problem is NP-complete even for 3-stage graphs and give an approximation algorithm with logarithmic approximation ratio. Moreover we show that the problem can be solved in polynomial time for trees. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Approximation algorithms

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C2P: Clustering based on closest pairs 27

C2P: Clustering based on closest pairs

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27th International Conference on Very Large Data Bases, VLDB 2001

作者： Nanopoulos, Alexandros Theodoridis, Yannis Manolopoulos, Yannis Dept. Informatics Aristotle Univ. Thessaloniki Greece Data and Knowl. Eng. Group Computer Technology Inst. Patras Greece Dept. Computer Science Univ. of Cyprus Nicosia Cyprus Department of Informatics Aristotle University Thessaloniki54006 Greece

ISBN: (纸本)1558608044

In this paper we present C2P, a new clustering algorithm for large spatial databases, which exploits spatial access methods for the determination of closest pairs. Several extensions are presented for scalable clustering in large databases that contain clusters of various shapes and outliers. Due to its characteristics, the proposed algorithm attains the advantages of hierarchical clustering and graphtheoretic algorithms providing both efficiency and quality of clustering result. The superiority of C2P is verified both with analytical and experimental results.

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Intelligent techniques for spatio-temporal data analysis in environmental applications

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Advanced Course in Artificial Intelligence, ACAI 1999

作者： Vassilas, Nikolaos Kalapanidas, Elias Avouris, Nikolaos Perantonis, Stavros Dept. of Computer Science T.E.I. of Athens 12210 Egaleo Attica Greece Electrical and Computer Engineering Dept. University of Patras 265 00 Rio-Patras Greece Inst. of Informatics and Telecommunications NCSR Demokritos 15310 Athens Greece

ISBN: (纸本)3540424903

Environmental applications share common features that make them distinct from typical applications of other areas of applied computer science. This fact has lead during the last years to the development of Environmental informatics, a novel specialty of Applied informatics, which studies specific problems related with the application of computer science techniques in environmental problems. In environmental applications often many different, non homogeneous information sources can be found, such as text data e.g. environmental legislation or research projects results, measurement data from monitoring networks, structural data on chemical substances, satellite data etc. In particular, environmental data is often geographically coded, i.e. information is attached to a particular point or region in space. Secondly, some of the data objects are multidimensional and have to be represented by means of complex geometric objects (polygons or curves).

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