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Scintillation Time Series Synthesis for Satellite Links with Hidden Markov Model

Scintillation Time Series Synthesis for Satellite Links with...

引用

International Workshop on Satellite and Space Communications (IWSSC)

作者： Laszlo Csurgai-Horvath Janos Bito Department of Broadband Infocommunications and Electromagnetic Theory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

This paper introduces a method to model the rapid attenuation fluctuations (the scintillation) on satellite links with generating the time series of attenuation levels. The applied model is a hidden Markov model which is parameterized from an appropriate filtered Gaussian white noise signal. For the parameterization of the Markov chain the Baum-Welch expectation-maximization algorithm has been used. The resulting Markov model is applicable to generate scintillation time series for any desired duration with the time and amplitude resolution of the original training data. From the synthesized time series the statistical properties like the cumulative distribution and the dynamics of the scintillation can be also determined. To prove the accuracy of the model at first the cumulative distribution function of the original and synthesized time series are compared. A further test of the model validity is the comparison with real scintillation measurement on a land mobile satellite link. Finally, the spectral test of the filtered Gaussian model, the hidden Markov model and the satellite link measurement shows that the constant and decreasing parts in the periodograms are showing similarities what confirms the good quality of the model.

关键词： Satellites Hidden Markov models Signal synthesis Attenuation Testing Fluctuations White noise Expectation-maximization algorithms Signal resolution Training data

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Lower Bounds on the Vapnik-Chervonenkis Dimension of Convex Polytope Classifiers

Lower Bounds on the Vapnik-Chervonenkis Dimension of Convex ...

引用

IEEE International Conference on Intelligent Engineering Systems (INES)

作者： Gabor Takacs Bela Pataki Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In statistical learning theory, the Vapnik-Chervonenkis (VC) dimension is an important combinatorial property of classifier families. In this paper we examine the case of convex polytope classification, i.e. when the separation of the two classes is done by a convex surface consisting of linear segments. We collect the known facts about the VC dimension of convex polytope classifiers with n facets in R d and present two new lower bounds (one for the general case and one for the special case d = 4).

关键词： Virtual colonoscopy Statistical learning Classification tree analysis Information systems Vectors Labeling Error probability Error analysis Decision trees Nearest neighbor searches

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Analyses of the Earthing Resistance of HV/MV Transformer Stations with Different Earth Electrode Arrangements and Soil Structures

Analyses of the Earthing Resistance of HV/MV Transformer Sta...

引用

IEEE International Symposium on Electromagnetic Compatibility and Electromagnetic Ecology

作者： Jozsef Ladanyi Department of Electric Power Engineering Budapest University슠of슠Technology슠and슠Economics Hungary

In this paper the earthing resistance of substations with different earth electrode and soil structures is investigated by simulation studies with the use of CDEGS (Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis) software code. The paper presents the effect of grid geometry, soil characteristics, the effectiveness of the vertical earth rods and the conductor diameter.

关键词： Grounding Satellite ground stations Electrodes Soil Substations Analytical models Current distribution Electromagnetic fields Electromagnetic analysis Geometry

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Improvements of the variable thermal resistance

Improvements of the variable thermal resistance

引用

International Workshop on Thermal Investigation of ICs and Systems (THERMINIC)

作者： V. Szekely S. Torok E. Kollar Department of Electron Devices Budapest University슠of슠Technology슠and슠Economics Hungary

A flat mounting unit with electronically variable thermal resistance has been presented in the last year. The design was based on a Peltier cell and the appropriate control electronics and software. The device is devoted especially to the thermal characterization of packages, e.g. in dual cold plate arrangements. Although this design meets the requirements of the static measurement we are intended to improve its parameters as the settling time and dynamic thermal impedance and the range of realized thermal resistance. The new design applies the heat flux sensor developed by our team as well, making easier the control of the device. This development allows even the realization of negative thermal resistances.

关键词： Thermal resistance Electronic packaging thermal management Thermal variables control Electric variables control Cold plates Electrical resistance measurement Impedance measurement Time measurement Sensor phenomena and characterization Thermal sensors

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Angle Dependent N-State Markov Model for Rain Attenuation Time Series Generation

Angle Dependent N-State Markov Model for Rain Attenuation Ti...

引用

The Second European Conference on Antennas and Propagation, EuCAP 2007

作者： Balazs Heder Janos Bito Department of Broadband Infocommunications and Electromagnetic Theory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In our previous works an N-state Markov chain model was used to generate a rain attenuation time series [1,2,3,4]. The model is applicable for predicting the first and second order statistics of attenuation on a proposed microwave link in the planning phase. The model parameters were derived from fade slope statistics of measured attenuation. The novelty of this work is investigating the correlation angle dependency of the generated time series.

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Chaotic Behavior of Noise Suppressed Solid State Lasers used in Radio-over-Fiber Systems

Chaotic Behavior of Noise Suppressed Solid State Lasers used...

引用

International Topical Meeting on Microwave Photonics (MWP)

作者： Mark Csornyei Tibor Berceli Department of Broadband Infocommunications and Electromagnetic Theory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

This paper describes the dynamic behavior of noise suppressed Nd:YVO 4 lasers. Applying an optoelectronic feedback loop the suppression of intensity noise at relaxation oscillations is feasible. However feedbacking c... 详细信息

关键词： Chaos Solid lasers Laser feedback Laser noise Pump lasers Optical noise Microchip lasers Laser mode locking Laser excitation Feedback loop

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On Aggregation of Fuzzy Preference Structures

On Aggregation of Fuzzy Preference Structures

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International Symposium on Computational Intelligence and Intelligent Informatics, ISCIII

作者： Janos Fodor Imre J. Rudas Institute of Intelligent Engineering Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

We investigate the problem of aggregation of fuzzy preference structures in multicriteria decision making. Starting from monocriterion weak preferences, there are two ways to define global strict preference, indifference and incomparability. We prove that, under very mild conditions, the only aggregation for which those two ways result in the same global preference structure is dictatorial.

关键词： Decision making Fuzzy sets Fuzzy systems Intelligent systems Intelligent structures Systems engineering and theory Aggregates Fuzzy logic Equations

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Novel Method for Modelling and Calculating the Harmonic Effect and Psophometric Disturbance of High Power Electric Traction

Novel Method for Modelling and Calculating the Harmonic Effe...

引用

IEEE International Symposium on Electromagnetic Compatibility and Electromagnetic Ecology

作者： Peter Kiss Andras Dan Department of Electric Power Engineering Budapest University슠of슠Technology슠and슠Economics Hungary

The paper presents the combination of frequency and time dependent model to simulate the effects of the power electric traction on the supply network. This novel method, called double domain simulation is improving the accuracy of the frequency domain simulation. To calculate the sophisticated model of the electric locomotive as a non-linear load a time dependent model must be used. The traction supply system together with the equivalent supply network impedance could be calculated in frequency domain. An iteration algorithm is developed converting the variables in every iteration step between the time and frequency domain.

关键词： Power system harmonics Power harmonic filters Frequency domain analysis Voltage Rail transportation Impedance Power system modeling Harmonic distortion Harmonic filters Current measurement

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On a Class of Continuous Triangular Norms

On a Class of Continuous Triangular Norms

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International Workshop on Soft Computing Applications (SOFA)

作者： Janos Fodor Imre J. Rudas Institute of Intelligent Engineering Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In this paper we completely describe all continuous migrative triangular norms. Since the migrative property excludes both idempotent and nilpotent classes, the characterization and construction is carried out by solving a functional equation for additive generators of strict t-norms. We also study cases when the construction results in a smooth generator.

关键词： Equations Additives Intelligent systems Systems engineering and theory Character generation Prototypes Turning

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Sequential prediction of binary sequence with side information only

Sequential prediction of binary sequence with side informati...

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IEEE International Symposium on Information Theory

作者： Gyorgy Ottucsak Laszlo Gyorfi Department of Computer Science and Information Theory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

ISBN: (纸本)9781424413973;1424413974

A simple on-line procedure is considered for the prediction of a binary-valued sequence in the setup introduced and studied by Weissman and Merhav [2001], [2004], where only side information is available for the algorithm. The (non-randomized) algorithm is based on a convex combination of several simple predictors. If the side information is also binary-valued (i.e. original sequence is corrupted by a binary sequence) and both processes are realizations of stationary and ergodic random processes then the average of the loss converges, almost surely, to that of the optimum, given by the Bayes predictor. An analog result is offered for the classification of binary processes.

关键词： Binary sequences Economic forecasting Random processes Yttrium Random variables

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