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Dissertations / Theses on the topic 'Gaussian noise'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Schlag, Adam Wayne. "DEVELOPMENT AND MODIFICATION OF A GAUSSIAN AND NON-GAUSSIAN NOISE EXPOSURE SYSTEM." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/973.

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Millions of people across the world currently have noise induced hearing loss, and many are working in conditions with both continuous Gaussian and non-Gaussian noises that could affect their hearing. It was hypothesized that the energy of the noise was the cause of the hearing loss and did not depend on temporal pattern of a noise. This was referred to as the equal energy hypothesis. This hypothesis has been shown to have limitations though. This means that there is a difference in the types of noise a person receives to induce hearing loss and it is necessary to build a system that can easil

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2

Sung, Youngkyu. "Non-Gaussian noise spectroscopy with superconducting qubits." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120365.

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Thesis: S.M. in Computer Science and Engineering, Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 91-95).<br>Most quantum control and quantum error-correction protocols assume that the noise causing decoherence is described by Gaussian statistics. However, the Gaussianity assumption break

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3

Gaerke, Tiffani M. "Characteristic Functions and Bernoulli-Gaussian Impulsive Noise Channels." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1408040080.

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4

Watson, Stephen M. "Frequency demodulation in the presence of multiplicative speckle noise." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246382.

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5

Zoghi, Masrour. "Regret bounds for Gaussian process bandits without observation noise." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/42865.

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This thesis presents some statistical refinements of the bandits approach presented in [11] in the situation where there is no observation noise. We give an improved bound on the cumulative regret of the samples chosen by an algorithm that is related (though not identical) to the UCB algorithm of [11] in a complementary setting. Given a function f on a domain D ⊆ R^d , sampled from a Gaussian process with an anisotropic kernel that is four times differentiable at 0, and a lattice L ⊆ D, we show that if the points in L are chosen for sampling using our branch-and-bound algorithm, the regret asy

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6

Aouini, Sadok. "A programmable analog Gaussian noise generator for test applications /." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99401.

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This thesis presents a robust programmable analog Gaussian noise generator suitable for mixed-signal test applications. Unlike conventional methods, noise generators employing a linear feedback shift register (LFSR) or resistor thermal noise amplification techniques, the user has full control over the characteristics of the Gaussian signal. Indeed, the frequency band, the mean, and the variance of the distribution are fully programmable over the voltage range within the supply rails. The method consists of digitally encoding the specified Gaussian signal in a random access memory (RAM), using

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7

Jezierska, Anna Maria. "Image restoration in the presence of Poisson-Gaussian noise." Phd thesis, Université Paris-Est, 2013. http://tel.archives-ouvertes.fr/tel-00906718.

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This thesis deals with the restoration of images corrupted by blur and noise, with emphasis on confocal microscopy and macroscopy applications. Due to low photon count and high detector noise, the Poisson-Gaussian model is well suited to this context. However, up to now it had not been widely utilized because of theoretical and practical difficulties. In view of this, we formulate the image restoration problem in the presence of Poisson-Gaussian noise in a variational framework, where we express and study the exact data fidelity term. The solution to the problem can also be interpreted as a Ma

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8

Hocquet, Antoine. "The Landau-Lifshitz-Gilbert equation driven by Gaussian noise." Palaiseau, Ecole polytechnique, 2015. https://theses.hal.science/tel-01265433/document.

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Cette thèse porte sur l'influence d'un bruit Gaussien dans l'équation de Landau-Lifshitz-Gilbert Stochastique (SLLG). Il s'agit d'une équation aux dérivées partielles stochastique, non linéaire, avec une contrainte non convexe sur le module des solutions. Le chapitre 1 se consacre tout d'abord à la solvabilité locale de SLLG. Utilisant les propriétés classiques de l'intégration stochastique dans un espace de Banach, nous proposons une formulation mild, et donnons l'existence et l'unicité d'une solution locale en dimension quelconque, pour un bruit Gaussien régulier en espace, dans le cas sur-a

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9

Napier, T. M., and R. A. Peloso. "A PREDICTABLE PERFORMANCE WIDEBAND NOISE GENERATOR." International Foundation for Telemetering, 1990. http://hdl.handle.net/10150/613762.

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International Telemetering Conference Proceedings / October 29-November 02, 1990 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>An innovative digital approach to analog noise synthesis is described. This method can be used to test bit synchronizers and other communications equipment over a wide range of data rates. A generator has been built which has a constant RMS output voltage and a well-defined, closely Gaussian amplitude distribution. Its frequency spectrum is flat within 0.3 dB from dc to an upper limit which can be varied from 1 Hz to over 100 MHz. Both simulation and prac

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10

Green, Donald R. "The utility of higher-order statistics in Gaussian noise suppression." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Mar%5FGreen.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, March 2003.<br>Thesis advisor(s): Charles W. Therrien, Charles W. Granderson. Includes bibliographical references (p. 123). Also available online.

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11

Gustavsson, Jan-Olof. "Estimation in non-gaussian noise and classification of welding signals." Licentiate thesis, Luleå tekniska universitet, Signaler och system, 1991. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26514.

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12

Klein, Thierry Etienne 1971. "Capacity of Gaussian noise channels with side information and feedback." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8984.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.<br>Includes bibliographical references (p. 295-306).<br>In wireless communication systems, the communication channel is often modeled as a fading multiaccess channel with time-varying multipath. Because of the mobility of the users and the varying number of users, the transmission conditions are constantly changing. These characteristics of the channel, as well as the ever-growing number of users competing for limited resources, call for an efficient use of the available power and

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13

Al-Rubaye, Ghanim Abdulkareem Mughir. "Coded-OFDM for PLC systems in non-Gaussian noise channels." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3984.

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Nowadays, power line communication (PLC) is a technology that uses the power line grid for communication purposes along with transmitting electrical energy, for providing broadband services to homes and offices such as high-speed data, audio, video and multimedia applications. The advantages of this technology are to eliminate the need for new wiring and AC outlet plugs by using an existing infrastructure, ease of installation and reduction of the network deployment cost. However, the power line grid is originally designed for the transmission of the electric power at low frequencies; i.e. 50/

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14

Chavali, Venkata Gautham. "Signal Detection and Modulation Classification in Non-Gaussian Noise Environments." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28387.

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Signal detection and modulation classification are becoming increasingly important in a variety of wireless communication systems such as those involving spectrum management and electronic warfare and surveillance, among others. The majority of the signal detection and modulation classification algorithms available in the literature assume that the additive noise has a Gaussian distribution. However, while this is a good model for thermal noise, various studies have shown that the noise experienced in most radio channels, due to a variety of man-made and natural electromagnetic sources, is non

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15

Vu, Hung Van. "Capacities of Bernoulli-Gaussian Impulsive Noise Channels in Rayleigh Fading." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1407370145.

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16

Kanazawa, Kiyoshi. "Statistical mechanics for athermal fluctuation: Non-Gaussian noise in physics." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199084.

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17

Lu, Liang. "Subspace Gaussian mixture models for automatic speech recognition." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8065.

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In most of state-of-the-art speech recognition systems, Gaussian mixture models (GMMs) are used to model the density of the emitting states in the hidden Markov models (HMMs). In a conventional system, the model parameters of each GMM are estimated directly and independently given the alignment. This results a large number of model parameters to be estimated, and consequently, a large amount of training data is required to fit the model. In addition, different sources of acoustic variability that impact the accuracy of a recogniser such as pronunciation variation, accent, speaker factor and en

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18

Chuah, Teong Chee. "Robust techniques for multiuser CDMA communications in non Gaussian noise environments." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246626.

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19

Shu, Li 1970. "A power interval perspective on additive white Gaussian noise (AWGN) channels." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9118.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.<br>Includes bibliographical references (leaves 215-216).<br>We present a new perspective on additive white Gaussian noise (AWGN) channels that separates user and channel attributes. Following this separation, various questions concerning achievability and successive decoding can be reformulated as properties of the set of user attributes, which can be determined independently of the actual channel noise. To obtain these properties directly, we introduce a graphical framework calle

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20

Fang, Yue. "Volatility modeling and estimation of high-frequency data with Gaussian noise." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/11041.

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21

Quan, Jin. "Image Denoising of Gaussian and Poisson Noise Based on Wavelet Thresholding." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1380556846.

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22

Legg, Matthew W. "Non-Gaussian and non-homogeneous Poisson models of snapping shrimp noise." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/839.

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The problem of sonar detection and underwater communication in the presence of impulsive snapping shrimp noise is considered. Non-Gaussian amplitude and nonhomogeneous Poisson temporal statistical models of shrimp noise are investigated from the perspective of a single hydrophone immersed in shallow waters. New statistical models of the noise are devised and used to both challenge the superiority of existing models, and to provide alternative insights into the underlying physical processes.A heuristic amplitude statistical model of snapping shrimp noise is derived from first principles and com

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23

Yablonsky, Eugene. "Characterization of operators in non-gaussian infinite dimensional analysis." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1054787409.

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24

Zhang, Boya. "Computer Experimental Design for Gaussian Process Surrogates." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/99886.

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With a rapid development of computing power, computer experiments have gained popularity in various scientific fields, like cosmology, ecology and engineering. However, some computer experiments for complex processes are still computationally demanding. A surrogate model or emulator, is often employed as a fast substitute for the simulator. Meanwhile, a common challenge in computer experiments and related fields is to efficiently explore the input space using a small number of samples, i.e., the experimental design problem. This dissertation focuses on the design problem under Gaussian proces

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25

Feng, Tan. "Collaborative spectrum sensing in a cognitive radio system with non-Gaussian noise." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/7591.

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With the deployment of new wireless communication devices and services, the demand for radio spectrum continues to grow. Spectrum utilization can he improved using the Cognitive radio, concept which allows secondary users to opportunistically access the unused licensed spectrum bands without causing undue interference to licensed users. Most works on spectrum sensing assume a Gaussian noise model; however, in some situations, an impulsive noise model may be more appropriate. In this thesis, we consider the mixture Gaussian noise and the Laplacian noise model. Approximate closed-form expression

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26

Malefahlo, Eliab D. "Probing galaxy evolution below the noise threshold with radio observations." University of the Western Cape, 2020. http://hdl.handle.net/11394/8221.

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Philosophiae Doctor - PhD<br>The faint radio population consisting of star forming galaxies (SFG) and radio-quiet active galactic nuclei (AGN) is important in the study of galaxy evolution. However, the bulk of the faint population is below the detection threshold of the current radio surveys. I study this population through a Bayesian-stacking technique that I have adapted to probe the radio luminosity function (RLF) below the typical 5σ detection threshold. The technique works by fitting RLF models to radio flux densities extracted at the position of galaxies selected from an auxiliary

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27

Nasri-Nasrabadi, Amir Masoud. "Performance of wireless communication systems in ultra-wideband interference and non-Gaussian noise." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/5741.

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The growing demand for high speed wireless applications and the scarcity of the spectral resources has necessitated the development of new concepts that enable more efficient utilization of the frequency spectrum. Ultra-wideband (UWB) is an emerging technology that is capable of utilizing the spectral resources more effectively by sharing the spectrum with other applications. This spectrum sharing however can potentially result in harmful interference from UWB systems to devices co-existing in the same frequency band. Therefore, in order to guarantee peaceful co-existence, the effects of UWB i

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28

Droste, Felix. "Signal transmission in stochastic neuron models with non-white or non-Gaussian noise." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17294.

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Die vorliegende Arbeit befasst sich mit dem Einfluss von nicht-weißem oder nicht-Gauß’schem synaptischen Rauschen auf die Informationsübertragung in stochastischen Neuronenmodellen. Ziel ist es, zu verstehen, wie eine Nervenzelle ein Signal in ihrer Pulsaktivität kodiert. Synaptisches Rauschen beschreibt hier den Einfluss anderer Nervenzellen, die nicht das interessierende Signal tragen, aber seine Übertragung durch ihre synaptische Wirkung auf die betrachtete Zelle beeinflussen. In stochastischen Neuronenmodellen wird diese Hintergrundaktivität durch einen stochastischen Prozess mit geeignet

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29

Younan, Nicolas H. "Estimation techniques for parameters of complex exponentials with noise." Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1172004849.

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30

Kim, Donghae. "Identification of nonstationary parametric models using higher-order statistics." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264395.

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31

Teuber, Tanja [Verfasser], and Gabriele [Akademischer Betreuer] Steidl. "Anisotropic Smoothing and Image Restoration Facing Non-Gaussian Noise / Tanja Teuber. Betreuer: Gabriele Steidl." Kaiserslautern : Technische Universität Kaiserslautern, 2012. http://d-nb.info/102759428X/34.

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32

Chen, Brian. "Efficient communication over additive white Gaussian noise and intersymbol interference channels using chaotic sequences." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/40151.

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33

Huang, Weizheng. "Investigation on Digital Fountain Codes over Erasure Channels and Additive White Gaussian Noise Channels." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1336067205.

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34

Al-Talibi, Haidar. "On the Relevance of Fractional Gaussian Processes for Analysing Financial Markets." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-1762.

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<p>In recent years, the field of Fractional Brownian motion, Fractional Gaussian noise and long-range dependent processes has gained growing interest. Fractional Brownian motion is of great interest for example in telecommunications, hydrology and the generation of artificial landscapes. In fact, Fractional Brownian motion is a basic continuous process through which we show that it is neither a semimartingale nor a Markov process. In this work, we will focus on the path properties of Fractional Brownian motion and will try to check the absence of the property of a semimartingale. The concept o

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35

Schwalbe, Lehtihet Oliver, and Viktor Åryd. "A Comparison of Performance and Noise Resistance of Different Machine Learning Classifiers on Gaussian Clusters." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-301781.

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Most real world data contains some amount of noise, i.e. unwanted factors obscuring the underlying signal, making it harder to detect or categorize. This is a problem in machine learning classification. Multiple studies have shown the impact noise can have on the difficulty of different classification problems. Both attribute and class noise can have a big impact on classification accuracy, especially as the levels of noise increase. In this study we analyse how severely a number of different classification algorithms are affected by both attribute and class noise, and how the number of classe

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36

Cordoni, Francesco Giuseppe. "Delayed Forward-Backward stochastic PDE’s driven by non Gaussian Lévy noise with application in finance." Doctoral thesis, Università degli studi di Trento, 2016. https://hdl.handle.net/11572/368433.

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From the very first results, the mathematical theory of financial markets has undergone several changes, mostly due to financial crises who forced the mathematical-economical community to change the basic assumptions on which the whole theory is founded. Consequently a new mathematical foundation were needed. In particular, the 2007/2008 credit crunch showed the word that a new financial theoretical framework was necessary, since several empirical evidences emerged that aspects that were neglected prior to these years were in fact fundamental if one has to deal with financial markets. The goal

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37

Bosson, Alison. "Experiments with scale-space vision systems." Thesis, University of East Anglia, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323309.

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38

Ni, Li. "Non-equiprobable multi-level coding for the additive white Gaussian noise channel with Tikhonov phase error." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Fall2005/l%5Fni%5F120905.pdf.

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39

DeRieux, David A. "Investigation of spectral-based techniques for classification of wideband transient signals in additive white Gaussian noise." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA282954.

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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, March 1994.<br>Thesis advisor(s): Ralph Hippenstiel, Monique P. Fargues. "March 1994." Includes bibliographical references. Also available online.

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40

Cordoni, Francesco Giuseppe. "Delayed Forward-Backward stochastic PDE's driven by non Gaussian Lévy noise with application in finance." Doctoral thesis, University of Trento, 2016. http://eprints-phd.biblio.unitn.it/1870/1/Thesis.pdf.

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From the very first results, the mathematical theory of financial markets has undergone several changes, mostly due to financial crises who forced the mathematical-economical community to change the basic assumptions on which the whole theory is founded. Consequently a new mathematical foundation were needed. In particular, the 2007/2008 credit crunch showed the word that a new financial theoretical framework was necessary, since several empirical evidences emerged that aspects that were neglected prior to these years were in fact fundamental if one has to deal with financial markets. The goal

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41

Ng, Jimmy Hon-yuen. "Estimation of error rates and fade distributions on a Rayleigh fading channel with additive white Gaussian noise." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26318.

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Several characteristics of the Rayleigh fading channel are examined. A digital Rayleigh fading simulator is used to generate the (fading) signal envelope from which various statistics are derived. Based on the simulation results, a simple model is proposed in order to estimate the block error rate of a block of N data bits transmitted over the Rayleigh fading channel in the presence of additive white Gaussian noise. This model gives an average estimation error of about 4 % over the range of blocksizes N = 63, 127, 255, 511, 1023, 2047 (bits), average signal-to-noise ratios 70 = 5 to 35 (dB) a

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42

Xu, Fei [Verfasser]. "Quantum theory of plasmon-mediated light emssion by non-Gaussian noise of a tunnel junction / Fei Xu." Konstanz : Bibliothek der Universität Konstanz, 2017. http://d-nb.info/1138196134/34.

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43

Damian, Camilla, Zehra Eksi-Altay, and Rüdiger Frey. "EM algorithm for Markov chains observed via Gaussian noise and point process information: Theory and case studies." De Gruyter, 2018. http://dx.doi.org/10.1515/strm-2017-0021.

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In this paper we study parameter estimation via the Expectation Maximization (EM) algorithm for a continuous-time hidden Markov model with diffusion and point process observation. Inference problems of this type arise for instance in credit risk modelling. A key step in the application of the EM algorithm is the derivation of finite-dimensional filters for the quantities that are needed in the E-Step of the algorithm. In this context we obtain exact, unnormalized and robust filters, and we discuss their numerical implementation. Moreover, we propose several goodness-of-fit tests for hidden Mar

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Mu, Tingkui, Zeyu Chen, Chunmin Zhang, and Rongguang Liang. "Optimal design and performance metric of broadband full-Stokes polarimeters with immunity to Poisson and Gaussian noise." OPTICAL SOC AMER, 2016. http://hdl.handle.net/10150/622954.

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In this paper, the design, optimization and analysis of broadband full-Stokes polarimeters with immunity to both Poisson and Gaussian noise are presented. Different from the commonly-used optimization metrics such as, the condition number (CN), the equally weighted variance (EWV), or the polarimetric modulation efficiency (PME) for Gaussian noise, the optimally balanced condition for Poisson noise (BCPN) is, for the first time, proposed and used as a metric for the optimization of polarimeters. The numerical results show that the polarimeters optimized with the BCPN have immunity to both Poiss

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Tamburello, Philip Michael. "Iterative Memoryless Non-linear Estimators of Correlation for Complex-Valued Gaussian Processes that Exhibit Robustness to Impulsive Noise." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/64785.

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The autocorrelation function is a commonly used tool in statistical time series analysis. Under the assumption of Gaussianity, the sample autocorrelation function is the standard method used to estimate this function given a finite number of observations. Non-Gaussian, impulsive observation noise following probability density functions with thick tails, which often occurs in practice, can bias this estimator, rendering classical time series analysis methods ineffective. This work examines the robustness of two estimators of correlation based on memoryless nonlinear functions of observations,

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Dumitru, Corneliu Octavian. "Noise sources in robust uncompressed video watermarking." Phd thesis, Institut National des Télécommunications, 2010. http://tel.archives-ouvertes.fr/tel-00541755.

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Cette thèse traite de ce verrou théorique pour des vidéos naturelles. Les contributions scientifiques développées ont permis : 1. De réfuter mathématiquement le modèle gaussien en général adopté dans la littérature pour représenter le bruit de canal ; 2. D'établir pour la première fois, le caractère stationnaire des processus aléatoires représentant le bruit de canal, la méthode développée étant indépendante du type de données, de leur traitement et de la procédure d'estimation ; 3. De proposer une méthodologie de modélisation du bruit de canal à partir d'un mélange de gaussiennes pour une tra

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Dumitru, Corneliu Octavian. "Noise sources in robust uncompressed video watermarking." Electronic Thesis or Diss., Evry, Institut national des télécommunications, 2010. http://www.theses.fr/2010TELE0001.

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Cette thèse traite de ce verrou théorique pour des vidéos naturelles. Les contributions scientifiques développées ont permis : 1. De réfuter mathématiquement le modèle gaussien en général adopté dans la littérature pour représenter le bruit de canal ; 2. D’établir pour la première fois, le caractère stationnaire des processus aléatoires représentant le bruit de canal, la méthode développée étant indépendante du type de données, de leur traitement et de la procédure d’estimation ; 3. De proposer une méthodologie de modélisation du bruit de canal à partir d’un mélange de gaussiennes pour une tra

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48

Nötel, Jörg. "Active Brownian Particles with alpha Stable Noise in the Angular Dynamics: Non Gaussian Displacements, Adiabatic Eliminations, and Local Searchers." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/19681.

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Das Konzept von aktiven Brownschen Teilchen kann benutzt werden, um das Verhalten einfacher biologischer Organismen oder künstlicher Objekte, welche die Möglichkeit besitzen sich von selbst fortzubewegen zu beschreiben. Als Bewegungsgleichungen für aktive Brownsche Teilchen kommen Langevin Gleichungen zum Einsatz. In dieser Arbeit werden aktive Teilchen mit konstanter Geschwindigkeit diskutiert. Im ersten Teil der Arbeit wirkt auf die Bewegungsrichtung des Teilchen weißes alpha-stabiles Rauschen. Es werden die mittlere quadratische Verschiebung und der effektive Diffusionskoeffizient best

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49

Pan, Jie. "Advanced system design and performance analysis for high speed optical communications." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53564.

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The Nyquist WDM system realizes a terabit high spectral efficiency transmission system by allocating several subcarriers close to or equal to the baud rate. This system achieves optimal performance by maintaining both temporal and spectral orthogonality. However, ISI and ICI effects are inevitable in practical Nyquist WDM implementations due to the imperfect channel response and tight channel spacing and may cause significant performance degradations. Our primary research goals are to combat the ISI effects via the transmitter digital pre-shaping and to remove the ICI impairments at the receiv

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Planells-Rodríguez, Milena. "Modélisation des erreurs en sortie du décodeur dans une chaîne de transmission par satellite." Paris, ENST, 2003. http://www.theses.fr/2003ENST0023.

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Abstract:

Cette thèse traite du comportement des erreurs en sortie du decodeur dans une chaîne de transmission par satellite. Deux types de codage canal sont étudiés: la concaténation d'un code convolutif avec un code bloc Reed-Solomon, et la concaténation en parallèle de deux codes convolutifs avec décodage itératif (turbocode). L'algorithme utilisé pour le décodage convolutif dans le premier schéma est le maximum de vraisemblance, que l'on appelle aussi algorithme de Viterbi. On sait que les erreurs en sortie de cet algorithme apparaissent par rafales, à cause de la mémoire du code. Un groupe de bits

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