Date depot: 9 avril 2020 Titre: Multiplexage Spatial Avancé pour des Systèmes Au-delà de la 5G à Débit Ultra-Elevé Encadrant : Yahia MEDJAHDI (LISITE) Directeur de thèse: Carlos Faouzi BADER (LISITE) Domaine scientifique: Sciences et technologies de l'information et de la communication Thématique CNRS : Signal et communications Resumé: 5G networks are expected to be deployed in 2020 and are considered as a global game changer from a technological, economic, societal and environmental perspective, introducing very aggressive performance requirements in terms of latency, energy efficiency (EE) and wireless broadband capacity. With future wireless networks being expected to support a very broad variety of services characterized by conflicting and even more demanding requirements  , many experts state that the evolution defining the 6th Generation (6G) of cellular networks will be the virtualization of network resources such as to support user and service requirements by dynamically adjusting system parameters in order to adapt to network/wireless environment/service conditions. From a PHY layer perspective such an effort for virtualizing resources can only be enabled by means of smart networking interfaces with configurable radios. While environmental aware virtualization will contribute towards meeting these targets, the definition of new PHY layer designs is also required . More specifically, processing high bandwidth signals or high constellation modulation schemes is challenging for Radio Frequency front ends and poses the need for proposing record-high SE signal shaping. Achieving enhanced performance in bit rates will require the use of very high constellation order. However, these high order constellations are sensitive (among other) to non-linearity, phase noise, and antenna switching impacts in the transmission medium. For modulation schemes such as high-order Quadrature Amplitude Modulation (QAM), signal shaping may not be able to overcome some of these challenges. Therefore, it is vital to develop new signal shaping techniques that exploit additional signal dimensions for information bearing purposes. In that sense, spatial modulation (SM) and index modulations (IM) ( ) using novel dimensions for indexation could allow for achieving record-high bits/s/Hz/polarization in B5G wireless communication systems without blowing up the system power .