Dissertations / Theses on the topic 'Récupération d'horloge et de données'
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Tall, Ndiogou. "Etude et réalisation de circuits de récupération d'horloge et de données analogiques et numériques pour des applications bas débit et très faible consommation." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4717.
Full textClock and data recovery circuits are required in many wireless communication systems. This thesis is about development of such circuits with: firstly, the realization, in HCMOS9 0.13 μm of STMICROELECTRONICS technology, of 1 and 54 Mb/s analog CDR circuits, and secondly, the implementation of programmable digital circuits at low rates. In the aim of an impulse UWB transceiver dealing with video transmission, a CDR circuit at 54 Mb/s rate has been realized to provide clock signal synchronously with narrow pulses (their duration is about a few nanoseconds) from the energy detector. Another CDR circuit has been built at 1 Mb/s rate in a non-coherent IR- UWB receiver power management context. Both circuits have been implemented as 3rd order analog PLL. In this work, a phase comparator suitable for “RZ low duty cycle” data from the energy detector has been proposed. Circuits have been sized to obtain very good performances in terms of jitter and power consumption. Particularly, measured performances of the 1 Mb/s CDR circuit allow to plan an efficient power management (a decrease of more than 97% of the receiver total power consumption). In the context of a telemetry system from aircraft to ground, two digital CDR circuits have also been implemented. A second order digital PLL has been adopted in order to provide synchronous clock and data to an SOQPSK digital transmitter. Also, a digital ELGS circuit has been proposed to work in a PCM/FM receiver. For both CDR structures, the input signal rate is programmable and varies globally from 1 to 30 Mb/s
Withitsoonthorn, Suwimol. "Photodiode UTC et oscillateur différentiel commande en tension à base de TBdH InP pour récupération d'horloge dans un réseau de transmission optique à très haut débit." Paris 6, 2004. https://tel.archives-ouvertes.fr/tel-00006403v2.
Full textWithitsoonthorn, Suwimol. "Photodiode UTC et oscillateur différentiel commandé en tension à base de TBdH InP pour récupération d'horloge dans un réseau de transmission optique à très haut débit." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2004. http://tel.archives-ouvertes.fr/tel-00006403.
Full textGosset, Christophe. "Mélange à quatre ondes dans les structures semi-conductrices actives et ses applications à la regénération." Paris, ENST, 2002. http://www.theses.fr/2002ENST0035.
Full textData traffic growth leads to generalisation of fibre optic in telecommunication networks. Optical technologies allow to overcome physical limitations in electronic data processing for high speed (> 40 gbit/s) transmission. All-optical 3r regeneration will be one of the key functions in such future networks. Semiconductor devices appear to be adapted thanks to nanosecond scale radiative lifetime. We propose to use four-wave mixing properties in semiconductor amplifiers and lasers to achieve fundamental elements of 3r regeneration such as frames synchronisation, clock recovery and d-bascule
Mao, Yuqing. "Nouvelle génération de générateurs de fréquence par auto-calibration de la grille arrière des transistors en technologie FDSOI." Electronic Thesis or Diss., Université Côte d'Azur, 2023. http://www.theses.fr/2023COAZ4123.
Full textModern data communication systems heavily rely on synchronous transmission techniques to optimize bandwidth and minimize power consumption. In such systems, only the data signal is transmitted, necessitating the implementation of Clock and Data Recovery (CDR) circuits at the receiver end. This thesis explores the novel application of Fully-Depleted Silicon-On-Insulator (FDSOI) 28nm technology to enhance the performance of CDR circuits by mitigating short-channel effects through innovative transistor structures.One contribution of this thesis is the development of a negative resistance circuit using the back gate of the FDSOI transistor. This circuit employs a current mirror controlled by the back gate to create a negative resistance LC oscillator. In parallel, this work presents the implementation of two types of oscillators: a complementary ring oscillator and a fast ring oscillator. The complementary ring oscillator capitalizes on complementary inverters, offering automatic bias feedback by the back gate control, thereby enhancing its performance. Meanwhile, the fast ring oscillator uses fast inverters in combination with complementary inverters designed to minimize propagation delays. The thesis presents a detailed comparative analysis of these oscillators, highlighting their individual strengths and limitations. Furthermore, we introduce an injection signal into the ring oscillator, resulting in the creation of a low-jitter Injection-Locked Oscillator (ILO). This ILO exhibits remarkable performance characteristics, particularly in reducing phase noise and enhancing frequency stability. Taking advantage of the good performance of the ILO, we propose a novel low-cost and low-power Injection-Locked Clock and Data Recovery (ILCDR) with a fast-locking time and good jitter for burst-mode applications.To validate the proposed designs and their performance at different operational frequencies, extensive simulations have been carried out using Cadence Virtuoso at 868 MHz and 2.4 GHz. In addition, the layout design and post layout simulation of the ILCDR based on the complementary ring oscillator are also studied
Duverdier, Alban. "Cyclostationnarité et changements d'horloge périodiques." Toulouse, INPT, 1997. http://www.theses.fr/1997INPT136H.
Full textPham, Guillaume. "Contribution à l'étude du phénomène d'autopulsation dans les lasers a semi-conducteurs et de la récupération d'horloge." Paris, ENST, 1998. http://www.theses.fr/1998ENST0004.
Full textLorrière, Nominoë. "Cellules photovoltaïques pour la récupération d'énergie et la communication de données." Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0570.
Full textThe invention of high-intensity blue LED hit the market and the retail industry in 1993. It even brought a revolution in lighting history. These new devices significantly improved energy efficiency than ever before and led to their massive deployment since the end of the 2000s. Semiconductor materials for LED devices are used in the microelectronics domain to implement high-frequency logic functions.Light fidelity (LiFi) technologies combine illumination and communication capabilities by implanting information transmission function to existing lighting equipment. Information is transmitted by using intensity modulation of optical sources at high frequencies, far beyond the range of visual perception. LiFi is an enabling technology for the Internet of Things (IoT) systems. IoT requires a large number of wireless connections, so it is not compatible with existing radiofrequency networks.This work is based on the reception of light modulation. Photodiodes are the mostly used receivers, however their constraints on lighting and consumption make it difficult to meet the requirements of the IoT. On the ground of this, this research is aimed at studying the possibility of receiving LiFi modulation by photovoltaic cells and modules due to their two main qualities: passive detection and large dimensions (omnidirectional reception and shade resistance)
Noumon, Allini Elie. "Caractérisation, évaluation et utilisation du jitter d'horloge comme source d'aléa dans la sécurité des données." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSES019.
Full textThis thesis, funded by the DGA, is motivated by the problem of evaluation of TRNG for applications with a very high level of security. As current standards such as AIS-31 are not sufficient for these types of applications, the DGA proposes a complementary procedure, validated on TRNG using ring oscillators (RO), which aims to characterize the source of randomness of TRNG in order to identify electronic noises present in it. These noises are manifested in the digital circuits by the clock jitter generated in the RO. They can be characterized by their power spectral density related to the time Allan variance which allows, unlike the standard variance which is still widely used, to discriminate these different types of noise (mainly thermal, flicker). This study was used as a basis for estimating the proportion of jitter due to thermal noise used in stochastic models describing the output of TRNG. In order to illustrate and validate the DGA certification approach on other principles of TRNG apart from RO, we propose a characterization of PLL as a source of randomness. We have modeled the PLL in terms of transfer functions. This modeling has led to the identification of the source of noise at the output of the PLL, as well as its nature as a function of the physical parameters of the PLL. This allowed us to propose recommendations on the choice of parameters to ensure maximum entropy. In order to help in the design of this type of TRNG, we also propose a tool to search for the non-physical parameters of the generator ensuring the best compromise between security and throughput
Essid, Mehdi. "Intégration des données et applications hétérogènes et distribuées sur le Web." Aix-Marseille 1, 2005. http://www.theses.fr/2005AIX11035.
Full textKaba, Bangaly. "Décomposition de graphes comme outil de regroupement et de visualisation en fouille de données." Clermont-Ferrand 2, 2008. http://www.theses.fr/2008CLF21871.
Full textContat, Marc. "Etude de stratégies d'allocation de ressources et de fusion de données dans un système multi-capteurs pour la classification et la reconnaissance de cibles aériennes." Paris 11, 2002. http://www.theses.fr/2002PA112310.
Full textThe need for obtaining a faithful and more and more precise operational situation in military or civil applications led to a fast development of the multisensor systems. The multiplication of the means of measurement and the increase in their performances reinforced the need to improve the strategies of acquisition for information. Thus a collaboration between the sensors of the same system would provide the possibility of increasing the total effectiveness by a refinement of the mechanisms of decision-making depending on the characteristics of the sensors and the environment. In addition, the resource allocation manages the problem of the adequacy between the available physical resources with limited capacity and the volume of information to be treated. The object of this thesis is to study the strategies of resource allocation and data fusion for the simultaneous follow-up and the identification of several targets. Accordingly, the classification and the recognition of the objects must be carried out as soon as possible, without awaiting all the data which the sensors can provide. A mechanism is proposed in order to rank the choice of the attributes to be determined in first and thus the selection of the sensor and its mode. It carries out the management of the requests addressed to the sensors according to a priori information and to the received data of preceding measurements. Firstly in modular form, the algorithm was then improved to take account of contextual information, for the choice of the modes of sensors to be implemented, in order to use them in an optimal way. The results were validated on a software developed within the framework of an application of non cooperative target recognition in air monitoring
Redi, Miriam. "Nouvelles méthodes pour la recherche sémantique et esthétique d'informations multimédia." Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00866867.
Full textBéraud-Sudreau, Quentin. "Étude, conception optimisée et réalisation d’un prototype ASIC d’une extraction d’horloge haut débit pour une nouvelle génération de liaison à 80 Gbit/sec." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14765/document.
Full textThe increasing bandwidth demand for telecommunication leads to an important rise of serial link operating frequencies. This demand is also present in embedded systems with the growth of devices and peripherals performances. To ensure the data stream is well recovered, a clock and data recovery (CDR) circuit is placed before any logical blocks on the receiver side. The research activities presented in this thesis are related to the design of such a CDR. The phase detector plays a critical role in the CDR circuit and is specially studied. This thesis presents a phase comparator that provides an enhancement by introducing a windowed mode and reducing its operating frequency. The used CDR has a special topology, which is described, and the injection locked oscillator theory is explained. Most of the research of this study has focused on the design and layout of a 80 Gbps CDR. Several prototypes are realized in 130 nm SiGe process from STMicroelectronics
Béraud-Sudreau, Quentin. "Étude, conception optimisée et réalisation d'un prototype ASIC d'une extraction d'horloge haut débit pour une nouvelle génération de liaison à 80 Gbit/sec." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00821890.
Full textFlouvat, Frédéric. "Vers des solutions adaptatives et génériques pour l'extraction de motifs intéressants dans les données." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2006. http://tel.archives-ouvertes.fr/tel-00844480.
Full textNgo, Minh Nguyet. "Etude théorique et expérimentale de composants photoniques à semiconducteurs pour le traitement tout optique du signal à 40 Gbit/s et plus." Phd thesis, Université Rennes 1, 2010. http://tel.archives-ouvertes.fr/tel-00554333.
Full textMadera, Cedrine. "L’évolution des systèmes et architectures d’information sous l’influence des données massives : les lacs de données." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS071/document.
Full textData is on the heart of the digital transformation.The consequence is anacceleration of the information system evolution , which must adapt. The Big data phenomenonplays the role of catalyst of this evolution.Under its influence appears a new component of the information system: the data lake.Far from replacing the decision support systems that make up the information system, data lakes comecomplete information systems’s architecture.First, we focus on the factors that influence the evolution of information systemssuch as new software and middleware, new infrastructure technologies, but also the decision support system usage itself.Under the big data influence we study the impact that this entails especially with the appearance ofnew technologies such as Apache Hadoop as well as the current limits of the decision support system .The limits encountered by the current decision support system force a change to the information system which mustadapt and that gives birth to a new component: the data lake.In a second time we study in detail this new component, formalize our definition, giveour point of view on its positioning in the information system as well as with regard to the decision support system .In addition, we highlight a factor influencing the architecture of data lakes: data gravity, doing an analogy with the law of gravity and focusing on the factors that mayinfluence the data-processing relationship. We highlight, through a use case, that takingaccount of the data gravity can influence the design of a data lake.We complete this work by adapting the software product line approach to boot a methodof formalizations and modeling of data lakes. This method allows us:- to establish a minimum list of components to be put in place to operate a data lake without transforming it into a data swamp,- to evaluate the maturity of an existing data lake,- to quickly diagnose the missing components of an existing data lake that would have become a dataswamp- to conceptualize the creation of data lakes by being "software agnostic “
Nos, Jérémy. "Modèle conceptuel d'une exploitation d'uranium par récupération in situ; interprétation des données de production et apport de la modélisation du transport réactif en milieu hétérogène." Centre de géosciences (Fontainebleau, Seine et Marne), 2011. http://www.theses.fr/2011ENMP0002.
Full textThe in situ recovery of uranium involves pumping the water from the aquifer where the deposit is located, adding the reagents that will dissolve uranium minerals and injecting the solution obtained in this way. The solutions enriched in uranium are sent to the treatment plant. Once the uranium is removed, reagents are added again and the solutions are sent back to the deposit. The purpose of this thesis is to model this process to better plan and optimize the production, on the deposit of Muyunkum, Kazakhstan, whose exploitation is underway. This work is based upon the different available data: petrography, mineralogy, laboratory experiments and particularly production data. The modeling starts with a representation at thermodynamic equilibrium and without spatial dimension and it concludes with a 3D representation including the chemical kinetics, the spatial heterogeneities and the recycling of the solutions. Ferric iron, which appears naturally in the leaching solutions, is identified as a key factor for the oxidation of uranium. Its concentration variations are therefore particularly analyzed. And the main operational recommendations deal with optimizing the supply of ferric iron. To conclude, focus is put on the possible development of a planning tool: a probabilistic approach is proposed to study the potential impact of heterogeneities on the uranium production
Boher, Laurent. "Etude et mise en oeuvre de récepteurs itéractifs pour systèmes MIMO." Rennes, INSA, 2008. http://www.theses.fr/2008ISAR0017.
Full textMIMO systems, associating multiple antennas at transmission and reception, allow a significant gain in capacity thanks to exploitation of spatial diversity. Though they are promising, most of MIMO techniques insert co-antenna interference that must be cancelled to fully exploit the diversity of the channel. Iterative solutions based on turbo-equalization principle allow the interference to be treated but are relatively complex to implement. The aim of this thesis is to study the feasibility and the complexity of the integration of iterative receivers for MIMO systems. Firstly, an analysis of existing iterative solutions leads us to consider a MIMO detector based on linear filters that offers an interesting performance/complexity trade-off. Then, an efficient receiver architecture has been defined. We especially study the integration of matrix calculations for MMSE filtering and the scheduling of the exchanges between detection and decoding. Finally, an integration on FPGA allows the evaluation of proposed architectures
Fernandez, Arnaud. "Étude théorique et expérimentale des impulsions optiques générées par un amplificateur optique à semi-conducteurs (SOA) en blocage de modes." Phd thesis, Brest, 2009. http://www.theses.fr/2009BRES2020.
Full textThis thesis is based on the study of an active mode-locked laser operating at a repetition rate helow 10 Gb/s. The ring cavity of this laser is made with optical fibre acting as a propagating medium for optical pulses. This laser includes a semiconductor optical amplifier (SOA) whose gain is modulated by an external optical signal. The goal of this thesis is to put forward a cheap, simple, and elegant method to generate all-optical “clean” pulses dedicated to optical telecommunication. By “clean” pulses, we mean a pulse which fits a mathematical equation which is known to he interesting for fibre propagation, such as the transform limited soliton or gaussian functions. The assumption that a laser with a strong negative dispersion ring cavity, produced by a dispersion compensating fibre, may widely contribute to increasing the laser and pulse properties prompted the elaboration of this project. In this study we offer a theoretical and experimental approach
Darishchev, Alexander. "Analyse de connectivité et techniques de partitionnement de données appliquées à la caractérisation et la modélisation d'écoulement au sein des réservoirs très hétérogènes." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S162.
Full textComputer-based workflows have gained a paramount role in development and exploitation of natural hydrocarbon resources and other subsurface operations. One of the crucial problems of reservoir modelling and production forecasting is in pre-selecting appropriate models for quantifying uncertainty and robustly matching results of flow simulation to real field measurements and observations. This thesis addresses these and other related issues. We have explored a strategy to facilitate and speed up the adjustment of such numerical models to available field production data. Originally, the focus of this research was on conceptualising, developing and implementing fast proxy models related to the analysis of connectivity, as a physically meaningful property of the reservoir, with advanced cluster analysis techniques. The developed methodology includes also several original probability-oriented approaches towards the problems of sampling uncertainty and determining the sample size and the expected value of sample information. For targeting and prioritising relevant reservoir models, we aggregated geostatistical realisations into distinct classes with a generalised distance measure. Then, to improve the classification, we extended the silhouette-based graphical technique, called hereafter the "entire sequence of multiple silhouettes" in cluster analysis. This approach provided clear and comprehensive information about the intra- and inter-cluster dissimilarities, especially helpful in the case of weak, or even artificial, structures. Finally, the spatial separation and form-difference of clusters were graphically visualised and quantified with a scale-invariant probabilistic distance measure. The obtained relationships appeared to justify and validate the applicability of the proposed approaches to enhance the characterisation and modelling of flow. Reliable correlations were found between the shortest "injector-producer" pathways and water breakthrough times for different configurations of well placement, various heterogeneity levels and mobility ratios of fluids. The proposed graph-based connectivity proxies provided sufficiently accurate results and competitive performance at the meta-level. The use of them like precursors and ad hoc predictors is beneficial at the pre-processing stage of the workflow. Prior to history matching, a suitable and manageable number of appropriate reservoir models can be identified from the comparison of the available production data with the selected centrotype-models regarded as the class representatives, only for which the full fluid flow simulation is pre-requisite. The findings of this research work can easily be generalised and considered in a wider scope. Possible extensions, further improvements and implementation of them may also be expected in other fields of science and technology
Vallet, Laurent. "Contribution au renforcement de la protection de la vie privée. : Application à l' édition collaborative et anonyme des documents." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4043/document.
Full textThis thesis aims to strengthen the protection of privacy of authors in collaborative editing of electronic documents. The first part of our work consisted in the design a secured model for a collaborative document editor. Documents' confidentiality is ensured through a decentralized access control mechanism. A second part of the work was to protect the identity of communicating users by ensuring their anonymity during collaborative document editing. Our concept of collaborative editor is based on the use of sets of modifications for a document, which we call textit{deltas}. Thus, deltas define versions of the document and they can keep the history of subsequent modifications. When a new version of a document appears, only the new delta that results must be transmitted and stored : documents are thus distributed across a set of storage sites (servers). We show how this allows, first, to reduce the load of document version control system, and secondly, to improve overall security of the collaborative system. Decentralized recovery of a new version requires only recovery of appropriate deltas against a previous version and is therefore more efficient than recovering the entire document. The information of the link between deltas is stored directly with deltas and not in a table or a metadata object, that improves their security. The version control system maintains consistency between versions. Once a user has retrieved versions, she holds them in local, and the history can be accessed at any time without being necessary to connect to the central server. Deltas can be identified, indexed and maintained their integrity through the use of hash functions
Axelrad, David. "Application des technologies CMOS sur SOI aux fonctions d'interface des liens de communication haut débit (> 10 Gbit/s)." Phd thesis, 2005. http://tel.archives-ouvertes.fr/tel-00010675.
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