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Analyse théorique des distorsions dans la bande et en dehors de la bande de transmission pour les signaux à porteuses multiples : Impact conjoint des non-linéarités de l'amplificateur de puissance et effets de mémoire et prédistorsion

Abstract : OFDM multicarrier techniques are now widely deployed in most wireless communication systems, in particular in cellularnetworks (L TE), broadcast networks (DVB) and WiFi networks. However, multi-carrier modulations are characterized by avery large dynamic amplitude measured by the Peak to Average Power Ratio (PAPR). which prevents radio frequencydesigners to feed the signal at the optimal point of the Power Amplifier (PA) which reduces the PA energy efficiency. Inliterature, the PAPR reduction and linearization techniques are the main approaches to solve the PAPR problem, the PAnonlinearities problem. as well as the low PA efficiency problem.The approach developed in this thesis was to study an intelligent solution for future implementations to control thereduction of PAPR and the linearization steps in a flexible way according to some predefined parameters so that theybecome adaptive and self-configurable. More specifically, our work focused on the analytical analysis of in-band measureby the Error Vector Magnitude (EVM) and out-of-band distortions measured by the Adjacent Chanel Power Ratio (ACPR)for clipped multicarrier signals taking into account the impact of non-linear amplification, memory effects and predistortion.In particular. many analytical results complemented by simulation results to evaluate the EVM and ACPR are proposed.These analytical expressions depend on the PA characteristics taking into account or not the PA memory effects and theuse of clipping and pre-distortion techniques. lt is worthwhile to note that our proposed theoretical analyses could be veryuseful for optimizing future transmitter efficiency and linearity in the field of broadcasting applications for the deployment oDVB-T2 transmitters as well as for L TE cellular networks.
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Submitted on : Monday, July 3, 2017 - 4:05:07 PM
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Ali Cheaito. Analyse théorique des distorsions dans la bande et en dehors de la bande de transmission pour les signaux à porteuses multiples : Impact conjoint des non-linéarités de l'amplificateur de puissance et effets de mémoire et prédistorsion. Traitement du signal et de l'image [eess.SP]. INSA de Rennes, 2017. Français. ⟨NNT : 2017ISAR0001⟩. ⟨tel-01553518⟩

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