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La recherche au DEOS

“Communication and Information Theory” (ComiT) scientific group

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The “Communication and Information Theory” (ComiT) scientific group is involved in the disciplines of digital communications, radar, and channel access techniques. Its fields of application include space systems, civil and military aviation, terrestrial cellular networks and the Internet of Things (IoT).

Nos thématiques de recherche

Le groupe ComIT concentre ses travaux sur trois thématiques principales :

  • Conception de formes d’onde efficaces, robustes et sécurisées

Nous nous intéressons à la mise en forme appropriée de l’information, compte tenu des caractéristiques des canaux de propagation. Nous visons l’efficacité énergétique ou spectrale, tout en considérant le compromis entre robustesse et sécurité.

Ainsi, nous abordons par exemple la construction de codes correcteurs d’erreurs pour les canaux wiretap, la transmission au-delà de la cadence de Nyquist ainsi que l’optimisation de formes d’ondes multifonctions (ex. radar et communication). Nous nous intéressons aussi à l’apprentissage de formes d’ondes optimales et des décodeurs associés (ex. : auto-encodeurs).

  • Techniques de réception avancées 

Nous proposons des récepteurs adaptés à des modèles d’observation de plus en plus réalistes. Pour cela, nous exploitons des techniques d’estimation/détection basées sur des méthodes Bayésiennes et/ou sur des stratégies d’apprentissage supervisé (ex. : méthodes de Monte-Carlo par chaînes de Markov, réseaux de neurones).

Outre les critères de performance visés, des réalisations à complexité calculatoire maîtrisée sont au cœur de nos préoccupations. Citons par exemple la turbo-égalisation et le filtrage variationnel bayésien pour le suivi de la phase.

  • Exploitation efficace des ressources dans un contexte multiutilisateur

Nous étudions la problématique de l’accès aux ressources spectrales dans le contexte d’utilisateurs multiples, coopératifs ou non.

Un premier volet théorique vise la détermination de limites fondamentales (ex. : régions de capacité) et un second volet s’articule autour de la construction de méthodes d’accès aléatoires et du codage réseau spécifique aux systèmes aéronautiques et spatiaux.

Nos axes de recherche

Ces thématiques s’inscrivent dans quatre axes de recherche :

  1. Partage de spectre entre radar et communication : une forme d’onde unique pour assurer les deux fonctions permet une économie de ressources fréquentielles et favorise l’intégration des systèmes électroniques sous-jacents (ex. : partage de front-end et antennes).
  2. Sécurité de la couche physique : l’aléa inhérent au canal de propagation, et à certains composants électroniques, peut-être exploité pour garantir des communications sécurisées et des méthodes de génération de clés, en complément des méthodes cryptographiques.
  3. Radar à large bande : usuellement utilisé en imagerie, le radar à large bande peut être utilisé aussi pour la détection de cibles en mouvement. En exploitant leur migration en distance et la parcimonie de la scène, un mode non ambigu peut être obtenu.
  4. Techniques d’apprentissage pour la couche physique : les réseaux de neurones pour la réalisation de chaînes de communication de bout-en-bout (émetteurs et récepteurs), à très faible complexité ou pour des canaux difficiles à modéliser.
Damien Roque
Damien Roque

Responsable Groupe ComIT

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