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Dissertations / Theses on the topic 'Codes (symbols)'

Author: Grafiati
Published: 5 June 2025
Last updated: 1 August 2025

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1

Singhal, Rohit. "Multiple symbol decoding of differential space-time codes." Texas A&M University, 2003. http://hdl.handle.net/1969.1/344.

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Multiple-symbol detection of space-time differential codes (MS-STDC) decodes N consecutive space-time symbols using maximum likelihood (ML) sequence detection to gain in performance over the conventional differential detection scheme. However its computational complexity is exponential in N . A fast algorithm for implementing the MD-STDC in block-fading channels with complexity O(N 4) is developed. Its performance in both block-fading and symbol-by-symbol fading channels is demonstrated through simulations. Set partitioning in hierarchical trees (SPIHT) coupled with rate compatible punctured
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2

Abelló, Barberán Albert. "Turbo égalisation à haute performance pour la transmission par satellite au-delà de la cadence de Nyquist." Thesis, Toulouse, ISAE, 2018. http://www.theses.fr/2018ESAE0025/document.

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Le contexte de ces travaux de thèse est la transmission dite faster-than-Nyquist (FTN). Cette technique propose d’augmenter l’efficacité spectrale en augmentant lerythme de transmission au-delà de la bande occupée par le signal émis, indépendamment de laconstellation choisie. Il a été montré que le FTN offre des taux d’information supérieurs à ceuxdes systèmes de Nyquist. Toutefois, le non respect du critère de Nyquist entraîne l’apparitiond’interférence entre symboles et des techniques de réception appropriées doivent être utilisées.La technique de réception dite channel shortening consiste à
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3

Alder, Frank A. "Symbol assignment and performance of simplex signaling in high dimensional trellis-coded modulation." Ohio : Ohio University, 1998. http://www.ohiolink.edu/etd/view.cgi?ohiou1177008035.

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4

Kalgaonkar, Kaustubh. "Pilot symbol design for multiuser CDMA systems." Diss., Columbia, Mo. : University of Missouri-Columbia, 2004. http://hdl.handle.net/10355/5809.

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Thesis (M.A.)--University of Missouri-Columbia, 2004.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (June 30, 2006) Vita. Includes bibliographical references.
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5

Tong, Deborah Grace. "Codes of power : Dimensional semiotics and photonic perspectives." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0015/MQ55009.pdf.

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6

Rönn, Mattias. "Symvex : A Symbolic Execution System for Machine Code." Thesis, Linköpings universitet, Databas och informationsteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-124181.

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This thesis is a part of an ongoing research project at Link ̈oping University. The goal of the thesis work is to design and implement a prototype for a symbolic execution system that scales well with larger programs and is capable of performing symbolic execution on machine code. For this reason we have analyzed the current state of symbolic executors that are able to perform symbolic execution on machine code to see if we could use that implementation as base for our prototype. We wanted to know if any of the existing systems scaled well with large software. We found that neither of the exis
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7

Collingbourne, Peter Cyrus. "Symbolic crosschecking of data-parallel floating point code." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/10936.

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In this thesis we present a symbolic execution-based technique for cross-checking programs accelerated using SIMD or OpenCL against an unaccelerated version, as well as a technique for detecting data races in OpenCL programs. Our techniques are implemented in KLEE-CL, a symbolic execution engine based on KLEE that supports symbolic reasoning on the equivalence between expressions involving both integer and floating-point operations. While the current generation of constraint solvers provide good support for integer arithmetic, there is little support available for floating-point arithmetic, du
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8

Moukaled, Sina. "(الرموز الدلالية عند أنسي الحاج وجورج جرداق (أعلام بين الصحافة والأدب". Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCF004.

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Cette thèse porte sur les codes sémantiques chez Ounsi el-Hajj et Georges Jurdaq en comparant leurs écrits entre le journalisme et la littérature. La thèse traite le rôle de la presse dans la propagation du symbole et du symbolisme dans le mouvement de la littérature. Ounsi el-Hajj et Georges Jurdaq se sont servi et ont profité de la presse pour pouvoir investir les symboles dans leurs essais. Ces symboles deviennent des moyens pour exprimer des intentions de traiter l’histoire, la religion, le mythe et le patrimoine. La thèse aborde les symboles et leurs significations chez les deux écrivains
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9

Liew, Daniel Simon. "Symbolic execution of verification languages and floating-point code." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/59705.

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The focus of this thesis is a program analysis technique named symbolic execution. We present three main contributions to this field. First, an investigation into comparing several state-of-the-art program analysis tools at the level of an intermediate verification language over a large set of benchmarks, and improvements to the state-of-the-art of symbolic execution for this language. This is explored via a new tool, Symbooglix, that operates on the Boogie intermediate verification language. Second, an investigation into performing symbolic execution of floating-point programs via a standardi
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10

García, Herrero Francisco Miguel. "Architectures for soft-decision decoding of non-binary codes." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/33753.

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En esta tesis se estudia el dise¿no de decodificadores no-binarios para la correcci'on de errores en sistemas de comunicaci'on modernos de alta velocidad. El objetivo es proponer soluciones de baja complejidad para los algoritmos de decodificaci'on basados en los c'odigos de comprobaci'on de paridad de baja densidad no-binarios (NB-LDPC) y en los c'odigos Reed-Solomon, con la finalidad de implementar arquitecturas hardware eficientes. En la primera parte de la tesis se analizan los cuellos de botella existentes en los algoritmos y en las arquitecturas de decodificadores NB-LDPC y se pro
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11

Cardoso, Zylbersztajn Pedro. "Negotiating with the II && ! : reading codes and their symbolic structures of control." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118657.

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Thesis: S.M. in Art, Culture and Technology, Massachusetts Institute of Technology, Department of Architecture, 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 93-96).<br>This thesis investigates software as a textual and aesthetic object through research- based artistic practice and arts-based research. Its main particular interest is in how codes (computer codes, more specifically,
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12

Lui, Gee L., and Kuang Tsai. "DATA-AIDED SYMBOL TIME AND CARRIER PHASE TRACKING FOR PRE-CODED CPM SIGNALS." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608733.

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>A data-aided approach to symbol time and carrier phase synchronization applicable to general continuous phase modulation (CPM) signals with modulation index 0.5 is described. Simulated BER performance of two receivers equipped with these synchronizers is presented for a GMSK BT=1/5 signal received in noise with constant and dynamic synchronization errors. Results demonstrate that these synchronizers provide a very promising and yet simple solution to the tracking
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13

Liu, Kejing. "Architectures for Symbol Timing Synchronization in MIMO Communications." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd484.pdf.

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14

Sankarasubramaniam, Yogesh. "New Capacity-Approaching Codes for Run-Length-Limited Channels." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10483.

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Run-Length-Limited (RLL) channels are found in digital recording systems like the Hard Disk Drive (HDD), Compact Disc (CD), and Digital Versatile Disc (DVD). This thesis presents novel encoding algorithms for RLL channels based on a simple technique called bit stuffing. First, two new capacity-achieving variable-rate code constructions are proposed for (d,k) constraints. The variable-rate encoding ideas are then extended to (0,G/I) and other RLL constraints. Since variable-rate codes are of limited practical value, the second half of this thesis focuses on fixed-rate codes. The fixed-rate bit
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15

Bell, Karl. "Automated Student Code Assessment with Symbolic Execution and Java PathFinder." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/891.

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The assessment of student code is a necessary part of most programming courses. However, many ways of assessing the correctness of student code can be very time-consuming and may be error-prone. This paper presents JSymTester, a tool which uses the symbolic execution framework of the Java PathFinder to find test inputs for student code and uses these inputs to extensively compare its functionality to a reference implementation. This allows for automatic testing of student code, relying only on the reference implementation and the student's own implementation, eliminating the need to manually w
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16

Ghrayeb, Ali A. "ON SYMBOL TIMING RECOVERY IN ALL-DIGITAL RECEIVERS." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/609698.

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International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Sandia National Laboratories (SNL) currently achieves a bandwidth efficiency (h ) of 0.5 to 1.0 bps/Hz by using traditional modulation schemes, such as, BPSK and QFSK. SNL has an interest in increasing the present bandwidth efficiency by a factor of 4 or higher with the same allocated bandwidth (about 10 MHz). Simulations have shown that 32- QAM trellis-coded modulation (TCM) gives a good bit error rate (BER) performance, and meets the requirements as far as the b
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17

Earls, Darlene Knies. "The promise comes from faith /." Online version of thesis, 1993. http://hdl.handle.net/1850/11767.

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18

Lau, Hing-keung. "Pilot-symbol-aided techniques for spectrally efficient signals in multipath-fading channels /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19669161.

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19

Dolce, Francesco. "Codes bifixes, combinatoire des mots et systèmes dynamiques symboliques." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1036/document.

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L'étude des ensembles de mots complexité linéaire joue un rôle très important dans la théorie de combinatoire des mots et dans la théorie des systèmes dynamiques symboliques.Cette famille d'ensembles comprend les ensembles de facteurs : d'un mot Sturmien ou d'un mot d'Arnoux-Rauzy, d'un codage d'échange d'intervalle, d'un point fixe d'un morphisme primitif, etc.L'enjeu principal de cette thèse est l'étude de systèmes dynamiques minimales, définis de façon équivalente comme ensembles factoriels de mots uniformément récurrents.Comme résultat principal nous considérons une hiérarchie naturelle de
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20

Abdelkefi, Fatma. "Les Codes Reed-Solomon pour la correction des erreurs impulsives dans les systèmes multiporteuses." Paris, ENST, 2002. http://www.theses.fr/2002ENST0026.

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21

Béal, Marie-Pierre. "Codage, automates locaux et entropie." Paris 7, 1987. http://www.theses.fr/1987PA077181.

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Presentation des methodes de codage de suites binaires en des suites dont les facteurs satisfont certaines contraintes traduisant des limitations physiques dans des systemes de transmission ou de stockage de donnees. Traitement sous l'angle de la theorie des codes et des automates finis
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22

Lo, Yung-Cheng. "Circular trellis-coded modulation in spread spectrum communications." Ohio : Ohio University, 1997. http://www.ohiolink.edu/etd/view.cgi?ohiou1175020785.

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23

劉慶強 and Hing-keung Lau. "Pilot-symbol-aided techniques for spectrally efficient signals in multipath-fading channels." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31237198.

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24

Karagozlu, Eren. "A Study On Symbol Synchronization And Channel Estimation Form-ary Orthogonal Transmission." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613622/index.pdf.

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In this thesis, two key issues regarding M-ary orthogonal signaling systems, namely channel estimation and symbol timing recovery are investigated. Kasami codes, which are also called quasi orthogonal codes, are used for transmission of the information in place of orthogonal waveforms. In order to achieve symbol synchronization, a timing recovery scheme based on the Maximum Likelihood (ML) estimation of timing offset is proposed and the effects of proposed structure over the receiver performance are examined by using computer simulations. Moreover, the receiver performance of M-ary orthogonal
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25

Soong, Anthony C. K. "Reference symbol assisted multistage successive interference cancelling receiver for code division multiple access wireless communication systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21639.pdf.

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26

Ķešāne, Iveta. "Symbolic structure of the post-Soviet transformations in Latvia and emigration: avoiding shame and striving for hope and confidence." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/32704.

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Doctor of Philosophy<br>Sociology, Anthropology, and Social Work<br>Lothar F. Weyher<br>This dissertation explores the case of emigration from Latvia towards the West after collapse of the Soviet Union. It takes the perspective of a particular cultural structure that came to dominate post-Soviet Latvia and adopts the vantage point of the state-society relationships this structure has cast. The central question of this study examines: what is the relationship between the cultural structure in post-Soviet Latvia and emigration towards the West? This study answers this question by contrasting Lat
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27

Yadegari, Babak. "Automatic Deobfuscation and Reverse Engineering of Obfuscated Code." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/613135.

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Automatic malware analysis is an essential part of today's computer security practices. Nearly one million malware samples were delivered to the analysts on a daily basis on year 2014 alone while the number of samples submitted for analysis increases almost exponentially each year. Given the size of the threat we are facing today and the amount of malicious codes emerging every day, the ability to automatically analyze unknown and unwanted software is critically important more than ever. On the other hand, malware writers adapt their malicious codes to new security measurements to protect them
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28

Pineiro, Erik. "The aesthetics of code : on excellence in instrumental action." Doctoral thesis, KTH, Industrial Economics and Management, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3648.

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<p>Software systems form an essential part of Western society,serving as tools to uphold institutions, processes andservices. It is understandable, therefore, that the mostfundamental aspects of programs are their function and utility.But they are not, however, the only things programmers areconcerned with when writing them.</p><p>On the contrary, programmers also discuss about many otheraspects of software, including the beauty of code. Theydistinguish between different programming styles and expresstheir personal preferences, often by way of admiring andvilifying other people's code. Program
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David, Robin. "Formal Approaches for Automatic Deobfuscation and Reverse-engineering of Protected Codes." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0013/document.

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L’analyse de codes malveillants est un domaine de recherche en pleine expansion de par la criticité des infrastructures touchées et les coûts impliqués de plus en plus élevés. Ces logiciels utilisent fréquemment différentes techniques d’évasion visant à limiter la détection et ralentir les analyses. Parmi celles-ci, l’obfuscation permet de cacher le comportement réel d’un programme. Cette thèse étudie l’utilité de l’Exécution Symbolique Dynamique (DSE) pour la rétro-ingénierie. Tout d’abord, nous proposons deux variantes du DSE plus adaptées aux codes protégés. La première est une redéfinition
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30

Nhan, Nhat-Quang. "Optimisation de précodeurs linéaires pour les systèmes MIMO à récepteurs itératifs." Thesis, Brest, 2016. http://www.theses.fr/2016BRES0062/document.

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Les standards « Long-term evolution » (LTE) et LTE-Advanced (LTE-A) devraient influencer fortement l’avenir de la cinquième génération (5G) des réseaux mobiles. Ces normes exigent de hauts débits de données et une qualité de service de très bon niveau, ce qui permet d’assurer un faible taux d’erreur, avec une faible latence. Par ailleurs, la complexité doit être limitée. Dans le but de déterminer des solutions technologiques modernes qui satisfont ces contraintes fortes, nous étudions dans la thèse des systèmes de communication sans fil MIMO codés. D’abord, nous imposons un simple code convolu
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31

Santamaria, Laura. "From good to great : using cultural codes to improve the design and value proposition of sustainable product-service system innovations." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/26968.

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Modern lifestyles in the developed regions of the world operate beyond our planet's resource capacity. Over-consumption has not only proven detrimental for the environment, but has also undermined our capacity to achieve deep life satisfaction and societal well-being. Embracing more sustainable ways of consuming and producing is key in order to foster the conditions for humanity to flourish. Strategies for disrupting the dominant consumption patterns lie within the next challenges, as adoption of sustainable innovation is still disappointingly low and needs to be accelerated. Design for Sustai
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32

David, Robin. "Formal Approaches for Automatic Deobfuscation and Reverse-engineering of Protected Codes." Electronic Thesis or Diss., Université de Lorraine, 2017. http://www.theses.fr/2017LORR0013.

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L’analyse de codes malveillants est un domaine de recherche en pleine expansion de par la criticité des infrastructures touchées et les coûts impliqués de plus en plus élevés. Ces logiciels utilisent fréquemment différentes techniques d’évasion visant à limiter la détection et ralentir les analyses. Parmi celles-ci, l’obfuscation permet de cacher le comportement réel d’un programme. Cette thèse étudie l’utilité de l’Exécution Symbolique Dynamique (DSE) pour la rétro-ingénierie. Tout d’abord, nous proposons deux variantes du DSE plus adaptées aux codes protégés. La première est une redéfinition
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33

Самусь, Н. С., та О. В. Ошаровська. "Оцінка методів ентропійного кодування зв’язності сіткової моделі". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/65291.

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Кодування даних 3D об’єктів можна класифікувати різними шляхами. Якщо розглядувати зв’язність сіткової моделі таких об’єктів, алгоритми кодування можна розділити на 3 групи: 1) методи, в яких кодові символи пов’язані з площинами; 2) методи, в яких кодові символи пов’язані з вершинами; 3) методи, в яких кодові символи пов’язані з ребрами.
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Diógenes, Nivaldo Medeiros. "Os brancos do desassossego: a doutrina das cores segundo José Saramago." Universidade Presbiteriana Mackenzie, 2008. http://tede.mackenzie.br/jspui/handle/tede/2249.

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Made available in DSpace on 2016-03-15T19:46:40Z (GMT). No. of bitstreams: 1 Nivaldo Medeiros Diogenes.pdf: 741277 bytes, checksum: 85589cf3eb9a6e9e3242d2833bfbe957 (MD5) Previous issue date: 2008-06-19<br>Secretaria da Educação do Estado de São Paulo<br>This dissertation presents a study concerning the use of the colors in the Literature. For so much, it is been worth of the analyses of the Portuguese writer's two romances José Saramago: Rehearsal on the Blindness and Rehearsal on the lucidity with the objective of evidencing how the senses are built starting from the new signification of t
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35

Seyssel, Ricardo. "Um estudo histórico perceptual : a bandeira brasileira sem o Brasil /." São Paulo, 2006. http://hdl.handle.net/11449/99855.

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Orientador: Claudete Ribeiro<br>Resumo: Este trabalho tem por meta verificar problemas objetivos e subjetivos na concepção e definição da bandeira nacional brasileira e como isto pode afetar ou não, intelectual e culturalmente, os brasileiros. Afora as dificuldades de sua reprodução/manufatura correta, dada sua forma com minúcias - por exemplo: a colocação e tamanho das estrelas, a inclinação exata da faixa branca central e a correta tonalidade do azul -, nossa bandeira certamente apresenta falhas tanto de design e aspectos simbólicos quanto de comunicação e psico-sóciocultural. Esta dissertaç
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Agrebi, Souad. "De la représentation symbolique au langage lors de l'apprentissage de mécanismes en chimie organique dans l'enseignement supérieur." Lyon 2, 2004. http://theses.univ-lyon2.fr/documents/lyon2/2004/agrebi_s.

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L'étude du fonctionnement cognitif d'étudiants apprenant les bases des mécanismes réactionnels en chimie organique a été réalisée par analyse du langage lors d'une étude cas. Il a été fait référence aux connaissances mises en œuvre par des étudiants avancés dans leurs études (préparation à l'agrégation), et au savoir savant dont l'émergence dans la communauté a été recherchée jusqu'en 1922. L'étude des productions orales des étudiants a été envisagée via une étude des connaissances mises en œuvre, grâce au type de verbes utilisés, et en prenant en compte le changement de code pour les étudiant
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Oliveira, Cinthia Lopes de. "Tessitura e construção em Lúcio Cardoso: o diálogo entre cores e confissões." Universidade Federal de Juiz de Fora (UFJF), 2018. https://repositorio.ufjf.br/jspui/handle/ufjf/7161.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2018-08-23T19:21:12Z No. of bitstreams: 1 cinthialopesdeoliveira.pdf: 4439401 bytes, checksum: 049a4099c9658cf167c16933e8ee01aa (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-09-03T15:58:36Z (GMT) No. of bitstreams: 1 cinthialopesdeoliveira.pdf: 4439401 bytes, checksum: 049a4099c9658cf167c16933e8ee01aa (MD5)<br>Made available in DSpace on 2018-09-03T15:58:36Z (GMT). No. of bitstreams: 1 cinthialopesdeoliveira.pdf: 4439401 bytes, checksum: 049a4099c9658cf167c16933e8ee01aa (MD5) Previous i
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Agrebi, Souad Le Maréchal Jean-François Trabelsi-Ayadi Malika. "De la représentation symbolique au langage lors de l'apprentissage de mécanismes en chimie organique dans l'enseignement supérieur." Lyon : Université Lumière Lyon 2, 2004. http://theses.univ-lyon2.fr/sdx/theses/lyon2/2004/agrebi_s.

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Reproduction de : Thèse de doctorat : Sciences de l'éducation : Lyon 2 : 2004. Reproduction de : Thèse de doctorat : Sciences de l'éducation : Tunis, Institut supérieur de l'éducation et de la formation continue : 2004.<br>Thèse soutenue en co-tutelle. Titre provenant de l'écran-titre. Bibliogr.
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39

Iyamabo, Philip Ehizogie. "Exact BER Calculation of TCM-MAPSK using Pairwise Probability of Product Trellis Algorithm for DVB Applications." University of Toledo / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1481247472348161.

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40

Cecchetto, Sylvain. "Analyse du flot de données pour la construction du graphe de flot de contrôle des codes obfusqués." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0042.

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L’augmentation des cyberattaques dans le monde fait de l’analyse des codes malveillants un domaine de recherche prioritaire. Ces logiciels utilisent diverses méthodes de protection, encore appelées obfuscations, visant à contourner les antivirus et à ralentir le travail d’analyse. Dans ce contexte, cette thèse apporte une solution à la construction du Graphe de Flot de Contrôle (GFC) d’un code binaire obfusqué. Nous avons développé la plateforme BOA (Basic blOck Analysis) qui effectue une analyse statique d’un code binaire protégé. Pour cela, nous avons défini une sémantique s’appuyant sur l’o
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41

Nguema, Ndong Florent. "Étude de la dynamique symbolique des développements en base négative, système de Lyndon." Thesis, Poitiers, 2013. http://www.theses.fr/2013POIT2276/document.

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Ce travail est consacré à l'étude de systèmes de Lyndon (pour la relation d'ordre alterné) et àla dynamique symbolique des développements des nombres en base négative. Pour un réel ß &gt; 1fixé, nous construisons un code préfixe récurrent positif permettant non seulement de montrerl'intrinsèque ergodicité du —ß-shift mais aussi de déterminer la fonction zêta qui lui est associée.Nous étudions les conditions pour lesquelles le —ß-shift possède la spécification.En outre, lorsque ß est strictement plus petit que le nombre d'or, le langage du —ß-shift admet desmots intransitifs. Cet état de fait e
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42

Shaw, Christopher G. "Modulation and Synchronization for Aeronautical Telemetry." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/3971.

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Aeronautical telemetry systems have historically been implemented with constant envelope modulations like CPM. Shifts in system constraints including reduced available bandwidth and increased throughput demands have caused many in the field to reevaluate traditional methods and design practices. This work examines the costs and benefits of using APSK for aeronautical telemetry instead of CPM. Variable rate turbo codes are used to improve the power efficiency of 16- and 32-APSK. Spectral regrowth in nonlinear power amplifiers when driven by non-constant envelope modulation is also considered. S
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43

Barbier, Morgan. "Décodage en liste et application à la sécurité de l'information." Phd thesis, Ecole Polytechnique X, 2011. http://pastel.archives-ouvertes.fr/pastel-00677421.

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Cette thèse porte sur l'étude de certains aspects des codes correcteurs d'erreurs et leurs applications à la sécurité de l'information. Plus spécifiquement, on s'est intéressé aux problèmes de décodage complet et de décodage en liste. Une nouvelle notion de codes a été introduite en liant une famille de codes et un algorithme de décodage, mettant ainsi en évidence les codes pour lesquels le décodage complet est réalisable en un temps polynomial. On présente ensuite une reformulation de l'algorithme de Koetter et Vardy pour le décodage en liste pour les codes alternant et analysons sa complexit
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44

Susanto, Misfa. "Network Coding for Multihop Wireless Networks: Joint Random Linear Network Coding and Forward Error Correction with Interleaving for Multihop Wireless Networks." Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/14864.

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Optimising the throughput performance for wireless networks is one of the challenging tasks in the objectives of communication engineering, since wireless channels are prone to errors due to path losses, random noise, and fading phenomena. The transmission errors will be worse in a multihop scenario due to its accumulative effects. Network Coding (NC) is an elegant technique to improve the throughput performance of a communication network. There is the fact that the bit error rates over one modulation symbol of 16- and higher order- Quadrature Amplitude Modulation (QAM) scheme follow a certain
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45

Costa, Michele Nazareth da. "Codage spatio-temporel tensoriel pour les systèmes de communication sans fil MIMO." Thesis, Nice, 2014. http://www.theses.fr/2014NICE4014/document.

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Depuis le succès croissant des systèmes mobiles au cours des années 1990, les nouvelles technologies sans fil ont été développées afin de répondre à la demande croissante de services multimédias de haute qualité avec des taux d'erreur les plus faibles possibles. Un moyen intéressant pour améliorer les performances et obtenir de meilleurs taux de transmission consiste à combiner l'utilisation de plusieurs diversités avec un accès de multiplexage dans le cadre des systèmes MIMO. L'utilisation de techniques de sur-échantillonnage, d'étalement et de multiplexage, et de diversités supplémentaires c
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46

Peh, Lin Kiat. "Performance comparison of two implementations of TCM for QAM." Thesis, Monterey, California. Naval Postgraduate School, 2007. http://hdl.handle.net/10945/55202.

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Approved for public release; distribution is unlimited.<br>Trellis-Coded Modulation (TCM) is employed with quadrature amplitude modulation (QAM) to provide error correction coding with no expense in bandwidth. There are two common implementations of TCM, namely pragmatic TCM and Ungerboeck TCM. Both schemes employ Viterbi algorithms for decoding but have different code construction. This thesis investigates and compares the performance of pragmatic TCM and Ungerboeck TCM by implementing the Viterbi decoding algorithm for both schemes with 16-QAM and 64-QAM. Both pragmatic and Ungerboeck TCM wi
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47

Basset, Nicolas. "Volumetry of timed languages and applications." Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1073/document.

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Depuis le début des années 90, les automates temporisés et les langages temporisés ont été largement utilisés pour modéliser et vérifier les systèmes temps réels. Ces langages ont été aussi été largement étudiés d'un point de vue théorique. Plus récemment Asarin et Degorre ont introduit les notions de volume et d'entropie des langages temporisés pour quantifier la taille de ces langages et l'information que ses éléments contiennent. Dans cette thèse nous construisons de nouveaux développements à cette théorie (que nous appelons volumétrie des langages temporisés) et l'appliquons a plusieurs pr
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48

Karaoglu, Bulent. "A comparison of frequency offset estimation methods in Orthogonal Frequency Division Multiplexing (OFDM) systems." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FKaraoglu.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, Dec. 2004.<br>Thesis Advisor(s): Roberto Cristi, Murali Tummala. Includes bibliographical references (p. 45-46). Also available online.
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49

Klinka, Emmanuelle. "Analyse sémiotique des miniatures des codex du "Commentaire à l'Apocalypse" du Beatus de Liébana." Aix-Marseille 1, 1994. http://www.theses.fr/1995AIX10005.

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Je me suis proposé d’étudier des miniatures crées entre le 8e et le 12e siècles. Elles appartiennent aux différents codex des « Commentaires à l’Apocalyspe, dits Beatus. J’ai retenu 15 des 22 codex enluminés qui ont été conservés jusqu’à nos jours, sur la base d’un corpus de 17 thèmes illustratifs. Pour ce faire, je me suis fondée sur l’étude sémiotique que j’ai adaptée à l’iconographie. J’ai analysé chaque signe et sa situation spatiale dans l’image. Les principaux axes de la recherche sont : la présentation de mon corpus, de son auteur, et du contexte historique. Le travail d’analyse dévoile
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50

Klevskog, Emma. "Robert Langdon's Hero's Journey : Reading the Novels of Dan Brown with the perspective of the Monomyth." Thesis, Karlstads universitet, Institutionen för språk, litteratur och interkultur, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-48079.

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This essay investigates the characteristics of Robert Langdon and his female helpers in Dan Brown’s novels Angels and Demons, The Da Vinci Code, The Lost symbol and Inferno.  In each of these novels, the quests are always solved by a male-female team. This essay is therefore going to focus on the character of Robert Langdon and his female helpers with the perspective of the Monomyth by Joseph Campbell. The protagonist Robert Langdon is a Harvard University professor specialised in religious iconology and symbology, but in these four novels he is thrown into breath-taking adventures with danger
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