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Signature coding for OR channel with asynchronous access

Signature coding for OR channel with asynchronous access

引用

IEEE International Symposium on Information Theory

作者： S. Gyori Department of Computer Science and Information Theory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Signature coding for multiple access OR channel is considered. We prove that in block asynchronous case the upper bound on the minimum code length asymptotically is the same as in the case of synchronous access

关键词： Upper bound Envelope detectors Decoding Viterbi algorithm Demodulation Communication systems Time sharing computer systems Government

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UWB technology: chaotic communications versus noncoherent impulse radio

UWB technology: chaotic communications versus noncoherent im...

引用

European Conference on Circuit Theory and Design, ECCTD

作者： G. Kolumban Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Hungary

The IEEE 802.15.4a task group for wireless personal area networks (WLANs) is working on an ultra-wideband radio (UWB) standard for the indoor radio applications. Among the modulation schemes proposed, the noncoherent impulse radio and chaotic frequency modulated differential chaos shift keying (FM-DCSK) modulation schemes belong to the class of transmitted reference (TR) systems. This paper proposes a unified theory for the TR systems that makes possible the comparison of the FM-DCSK and noncoherent impulse radio systems, gives an exact expression for the noise performance of generalized TR system and determines the feasibility of an FM-DCSK UWB radio system.

关键词： Ultra wideband technology Chaotic communication Gaussian noise Additive white noise Nonlinear distortion Receivers System performance Bandwidth Frequency shift keying Wireless sensor networks

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Erasable, semi-fragile watermark embedding process for images

Erasable, semi-fragile watermark embedding process for image...

引用

IEEE International Conference on Intelligent Engineering Systems (INES)

作者： J. Lenti I. Lovanyi Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

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Fuzzy control solution for hydro turbine generators

Fuzzy control solution for hydro turbine generators

引用

International Conference on Control and Automation (ICCA)

作者： R.-E. Precup Z. Preitl S. Kilyeni Polytechnic University of Timisoara Timisoara Romania Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The paper proposes a fuzzy control solution based on a new Takagi-Sugeno fuzzy controller (TS-FC) dedicated to speed control of hydro turbine generators, where the plant is nonminimum phase systems. In the first phase PI controllers are developed ensuring desired maximum values both for the sensitivity function (s.f.) and for the complementary s.f. in frequency domain. Accepting the approximate equivalence between fuzzy controllers and the linear ones in certain conditions, an attractive design method for a four inputs-two outputs TS-FC is offered. The fuzzy control system guarantees maximum imposed s.f.s and therefore good responses with respect to modifications of reference and disturbance inputs, and robustness with respect to model uncertainties. The proposed solution has been validated through simulation of a real-world case study. The controller is compared with two PI controllers designed separately with respect to the reference input and to one of the disturbance inputs.

关键词： Fuzzy control Hydraulic turbines Takagi-Sugeno model Fuzzy systems Control systems Velocity control Frequency domain analysis Design methodology Robust control Uncertainty

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Admission control for elastic traffic using RED and/or droptail queues

Admission control for elastic traffic using RED and/or dropt...

引用

International Conference on Telecommunications (ConTEL)

作者： M. Yahia J. Biro Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Hungary

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Prefiltered Gaussian reconstruction for high-quality rendering of volumetric data sampled on a body-centered cubic grid

Prefiltered Gaussian reconstruction for high-quality renderi...

引用

IEEE Conference on Visualization

作者： B. Csebfalvi Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary

In this paper a novel high-quality reconstruction scheme is presented. Although our method is mainly proposed to reconstruct volumetric data sampled on an optimal body-centered cubic (BCC) grid, it can be easily adapted lo the conventional regular rectilinear grid as well. The reconstruction process is decomposed into two steps. The first step, which is considered to be a preprocessing, is a discrete Gaussian deconvolution performed only once in the frequency domain. Afterwards, the second step is a spatial-domain convolution with a truncated Gaussian kernel, which is used to interpolate arbitrary samples for ray casting. Since the preprocessing is actually a discrete prefiltering, we call our technique prefiltered Gaussian reconstruction (PGR). It is shown that the impulse response of PGR well approximates the ideal reconstruction kernel. Therefore the quality of PGR is much higher than that of previous reconstruction techniques proposed for optimally sampled data, which are based on linear and cubic box splines adapted to the BCC grid. Concerning the performance, PGR is slower than linear box-spline reconstruction but significantly faster than cubic box-spline reconstruction.

关键词： Image reconstruction Sampling methods Spline Interpolation Testing Frequency domain analysis Convolution Kernel Image processing Computer graphics

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Supporting Rapid Application Development on Symbian Platform

Supporting Rapid Application Development on Symbian Platform

引用

Eurocon

作者： B. Forstner L. Lengyel I. Kelenyi T. Levendovszky H. Charaf Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Programniing for the Symbian OS assumes that developers invest particular and uncommon work, therefore the development lifecycle is rather longer and the costs are usually higher than these of common C++ software development. Dealing with user interface, database or communication, programming is not so straightforward as expected. However, am appropriate developer tool can help the developers to be more efficient and solve the designing and programming difficulties. In this paper we will introduce a rapid application development tool set on the Symbian OS. We model the user interface and the statechart of the mobile applications with a novel tool (Visual Modeling and Transformation System). After this design phase, source code can be generated. We describe a class library that helps the programmers or code generators to produce Symbian source code that is easy to read and maintain

关键词： Application software User interfaces Costs Databases Libraries Programming profession

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Instruction set extension using Microblaze processor

Instruction set extension using Microblaze processor

引用

International Conference on Field Programmable Logic and Applications

作者： J. Lazanyi Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Instruction set extension is a common way to improve the performance of embedded processors. During my work the Microblaze synthesizable processor was used. It has a special high-speed bus called fast simplex link (FSL) enabling to develop multiprocessor systems and to integrate customized IP cores into the design. In the Xilinx usage scenario the operands of the special instruction are transmitted through the FSL link. To achieve higher data transfer rate the FSL was used only to control the function of the custom IP while the operands required for the operation read directly from the on-chip data memory.

关键词： Clocks Registers Information systems Multiprocessing systems Reduced instruction set computing Field programmable gate arrays Memory Communication system control Assembly Constraint optimization

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Architecture and configuration of broadband access networks supporting multimedia applications

Architecture and configuration of broadband access networks ...

引用

IEEE Symposium on Computers and Communications (ISCC)

作者： A. Kern M. Martinecz Z. Heszberger G. Sallai Department of Telecommunication and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Recent Internet access speeds have made it possible even for home users to reach and use previously unavailable bandwidth consuming (e.g. video on demand) services. However, the rapid spread of these applications is hindered by the lack of QoS guarantees in packet networks. In this article a QoS architecture is presented which have been designed for access networks and applies a logical overlay network to make network management tasks easier. The novelty of the architecture lies in the application of two key procedures adopted for dimensioning logical channels between edge nodes and mapping them to the physical routes. The upper load thresholds of the applied logical channels are also determined, which may form the basis of a more sophisticated call admission control policy.

关键词： Quality of service Bandwidth Multimedia systems Informatics Video on demand Call admission control Web and internet services Telecommunication traffic Application specific processors Robustness

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Inter-domain routing in multiprovider optical networks: game theory and simulations

Inter-domain routing in multiprovider optical networks: game...

引用

Conference on Next Generation Internet Networks, NGI

作者： K. Loja J. Szigeti T. Cinkler Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Multiprovider inter-domain routing can be modeled using game theory, since the domains (or the domain operators) act as players trying to maximize their revenues. Each domain decides what intra-domain connection alternatives it advertises for inter-domain traffic and what the key attributes are of these intra-domain connections (allocation cost, latency, bandwidth or confidence level of availability). The advertised parameters affect the routing algorithm, the selected inter-domain path as well as the payoff of all the operators. As the broadband communication networks become optical, our model assumes a two layer network consisting of autonomous domains, where the optical cross-connects have limited wavelength conversion capability. In this paper we study the dependency of the domain income and the advertised cost of connection alternatives, assuming "cheapest-path" routing. We examined basic scenarios of inter-domain routing and determined Nash and Pareto equilibrium for different network load levels, where provider tariffs and end-user satisfaction were taken into account simultaneously. Beside analytical results, we ran simulations which met our expectations.

关键词： Routing Optical fiber networks Game theory Optical wavelength conversion Costs Telecommunication traffic Traffic control Delay Bandwidth Broadband communication

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