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Rozprawy doktorskie na temat "Effet mémoire non-linéaire"
Cviklinski, Jean. "Interface quantique atomes-champ en régime de variables continues". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00315360.
Pełny tekst źródłaNous avons généré des états comprimés du champ par interaction non-linéaire en cavité avec un nuage d'atomes froids de césium se comportant comme un milieu Kerr.
Nous montrons ensuite expérimentalement que l'état quantique d'un faisceau lumineux peut être transféré à une cohérence Zeeman de grande durée de vie par transparence induite électromagnétiquement dans une vapeur de césium. Deux quadratures du champ qui ne commutent pas sont stockées simultanément puis relues sans leur ajouter de bruit.
Enfin, deux protocoles sont proposés pour réduire directement les fluctuations quantiques du moment angulaire collectif d'un ensemble d'atomes, soit en exploitant les non-linéarités apparaissant lors d'un piégeage cohérent de population, soit par l'intermédiaire de mesures quantiques non-destructives d'alignement utilisant un couplage linéaire par effet Raman.
Li, Feng. "Linéarisation des amplificateurs de puissance dans les systèmes de communication large bande par prédistorsion numérique en bande de base". Nantes, 2012. https://archive.bu.univ-nantes.fr/pollux/show/show?id=2118905c-2a53-4d48-8a83-3d8e78e9de2a.
Pełny tekst źródłaToday, new applications of radio frequencies are designed and proposed to provide more services to users. Spectrum resource becomes increasingly scarce due to an explosion of applications for new services. To achieve higher spectral efficiency, different non constant-envelop modulation techniques have been adopted in modern communication systems. The resulted signals become more sensitive to the nonlinearity presented in the transmission channel, particularly that of the power amplifier (PA). Moreover, in modern communication system, the bandwidth being more and more wider, the memory effects of PAs can no longer be ignored. To achieve higher efficiency, we need to work with average input power close to the compression zone by using additional devices to linearize PAs. The purpose of linearization techniques is to obtain a linear characteristic up to the saturation zone of the PA. One of the most promising techniques is the baseband digital predistortion technique due to its simplicity, flexibility, and reconfigurability. This technique inverts digitally the nonlinearity of the PA in baseband before the PA to get an overall linearized system. The objective of this thesis is to find some efficient baseband predistortion based linearization techniques (fast and simple to implement on digital cards), for the power amplifier with nonlinear memory effects
Legland, Jean-Baptiste. "Caractérisation par acoustique non linéaire des effets de vieillissement dans les milieux granulaires non cohésifs et désordonnés". Phd thesis, Université du Maine, 2012. http://tel.archives-ouvertes.fr/tel-01019990.
Pełny tekst źródłaAbi, Hussein Mazen. "Linéarisation des amplificateurs de puissance : prédistorsion numérique adaptative en bande de base". Nantes, 2009. http://www.theses.fr/2009NANT2036.
Pełny tekst źródłaThis work deals with the linearization of power amplifiers. The aim is to evaluate experimentally linearization performance of digital baseband predistortion techniques and to propose some novel efficient implementation approaches. First, the traditional study based on power series modeling of the PA was repeated. Nonlinear phenomena were described and quantified. In the second part, we present a state of the art on the various linearization techniques. The most important part of this study was dedicated to the adaptive digital baseband predistortion technique. A new method for the implementation of digital predistortion was then proposed. This method was validated with simulations under Matlab and with measures. Its performances were compared to other classical implementation methods. An investigation on implementation complexity was also realized when continuous adaptation is adopted. The proposed method forms a good compromise between complexity and speed of convergence. The last part of this thesis was devoted to measurements. An automated measurement test bench has been specifically developed for the evaluation of digital baseband predistortion techniques. Two sets of measurements with two amplifiers, low and high power amplifiers, were carried out. The aim was to evaluate experimentally the performances of the proposed method and to highlight the memory effects in high power amplifiers, and evaluate the performance of digital predistortion techniques in this case
Salman, Oguz Umut. "Modeling of spatio-temporal dynamics and patterning mechanisms of martensites by phase-field and lagrangian methods". Paris 6, 2009. http://www.theses.fr/2009PA066221.
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