FERRANTE Jocelyn 10/04/15 Sapienza Italie à 14h30

SUJET : Façonnement de l'interférence en vue d'une optimisation globale d’un système moderne de communication

Shaping Interference Towards Optimality of Modern Wireless Communication Transceivers

Directeur de Thèse : Prof. Jocelyn Fiorina (thèse en cotutelle avec Sapienza Université de Rome: co-direction de thèse avec Prof. Maria-Gabriella Di Benedetto)
(indiquer les noms par ordre alphabétique)
M. Laurent Clavier, Université de Lille (Rapporteur)
Mme. Maria-Gabriella Di Benedetto, Sapienza Université de Rome (Examinatrice, Encadrant de Thèse)
M. Pierre Duhamel, CNRS/Supélec (Examinateur)
M. Jocelyn Fiorina, Supélec (Examinateur, Encadrant de Thèse)
M. Andrea Giorgetti, Université de Bologne (Examinateur)
M. Michel Terré, CNAM (Rapporteur)


A communication is impulsive whenever the information-bearing signal is burst-like in time. Examples of the impulsive concept are: impulse-radio signals, that is, wireless signals occurring within short intervals of time; optical signals conveyed by photons; speech signals represented by sound pressure variations; pulse-position modulated electrical signals; a sequence of arrival/departure events in a queue; neural spike trains in the brain. Understanding impulsive communications requires to identify what is peculiar to this transmission paradigm, that is, different from traditional continuous communications.

In order to address the problem of understanding impulsive vs. non-impulsive communications, the framework of investigation must include the following aspects: the different interference statistics directly following from the impulsive signal structure; the different interaction of the impulsive signal with the physical medium; the actual possibility for impulsive communications of coding information into the time structure, relaxing the implicit assumption made in continuous transmissions that time is a mere support.

The thesis partially addresses a few of the above issues, and draws future lines of investigation. In particular, we studied multiple access channels where each user adopts time-hopping spread-spectrum; systems using a specific prefilter at the transmitter side, namely the transmit matched filter (also known as time reversal), particularly suited for ultrawide bandwidths; the distribution function of interference for impulsive systems in several different settings. The effect of the interference distribution on different performance metrics for both single-user and multiuser settings is studied, as well as the link between distributions of the transmitted signal and the interference.