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Evaluation analytique des distorsions de signaux à porteuses multiples en présence d'amplification non-linéaire et en prenant en compte différentes techniques de réduction de la dynamique des signaux

Abstract : OFDM multi-carrier modulations widely used in today’s wireless communication systems are characterized by a high dynamic range of the transmitted signal power measured by the Peak to Average Power Ratio (PAPR). At the amplification stage, the power amplifiers are usually characterized by a non-linear response, and thus the high PAPR of the OFDM signal requires the use a certain Input Power Back-off (IBO) relatively to the saturation level of the power amplifier. The role of this IBO is to limit the distortions generated in-band (measured by the EVM metric) and out-of-band of the signal due to the amplifier non-linearities. This leads to an energy efficiency that is as low as the IBO is high. Several PAPR reduction techniques have been proposed in the literature that can be applied to the signal before amplification to reduce its technique retained in standards like DVB-T2 and ATSC3.0. However, despite the large number of PAPR reduction algorithms proposed in the literature, the analytical evaluation of their performance has not been sufficiently studied. In this context, this thesis aims to analytically evaluate the performance of PAPR reduction strategies based on the TR technique, essentially by evaluating the EVM expression of the amplified OFDM signal while applying such techniques. These results are of high interest in order to predict the efficiency gains obtained using the TR technique. Moreover, the analytical expression of the EVM makes helps to precisely determine the optimal parameters of the selected technique by considering the overall optimization of the transmission chain.
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Submitted on : Thursday, September 22, 2022 - 9:36:36 AM
Last modification on : Friday, September 23, 2022 - 5:15:09 AM

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  • HAL Id : tel-03783260, version 1

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Mariam El Hassan. Evaluation analytique des distorsions de signaux à porteuses multiples en présence d'amplification non-linéaire et en prenant en compte différentes techniques de réduction de la dynamique des signaux. Electronique. INSA de Rennes; Université Libanaise, 2021. Français. ⟨NNT : 2021ISAR0016⟩. ⟨tel-03783260⟩

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