Soutenance de thèse de Habiba Lahdiri

Titre de la thèse

Cognitive RF-NoC for Manycore Architectures

Date et lieu de soutenance

14 janvier 2021, 14h.



The development of many-core architecture with thousands of multiprocessor cores introduces a growing demand in bandwidth and communication. The Network-on-chip (NoC) paradigm has been proposed as a promising solution to enable the handling of a high degree of integration in multi-/many-core architectures. Despite their advantages, wired NoC infrastructures are facing several performance issues regarding multi-hop long-distance communications. RF-NoC is an attractive solution offering high performance and multicast/broadcast capabilities. WiNoCoD project propose an Orthogonal Frequency Division Multiple Access (OFDMA) based on-chip RF interconnect which enables a fully flexible RF architecture.

In this thesis, we propose a  solution in order to improve the WiNoCoD architecture by integrating a cognitive function. This approach allows to avoid exchanging additional data among clusters to dynamically allocate sub-carriers  such as the QPS. However, managing RF links is a critical aspect that relies on both application-dependent and architectural parameters. This thesis proposes a design space exploration framework for OFDMA-based RF-NoC architecture.

The second research field in this thesis concerns Deep Neural Network (DNN) accelerators. In DNN accelerators, the on-chip traffic and memory traffic accounts for a relevant fraction of the inference latency and energy consumption. A major component of such traffic is due to the moving of the DNN model parameters from the main memory to the memory interface and from the latter to the processing elements (PEs) of the accelerator.

In this thesis, we present DNNZip and Angle-based,  techniques aimed at compressing the model parameters of a DNN, thus resulting in significant energy and performance improvement.


  • Daniel Chillet, Professeur des Universités, Irisa/ENSSAT, Rapporteur
  • Benoit Miramond, Professeur des Universités, Univ. de Nice Sophia Antipolis/LEAT, Rapporteur
  • Serge Weber, Professeur des Universités, Univ. de Lorraine/IJL, Examinateur
  • Catherine Dezan, Maître de conférences, Univ. de Bretagne Occidentale/Labstic, Examinatrice
  • Christophe Moy, Professeur des Universités, Univ. de Rennes 1/IETR, Examinateur
  • Maurizio Palesi, Professeur des Universités, Univ. de Catane, Italie, Invité
  • Salvatore Monteleone, Maître de conférences, Univ. Kore de Enna, Italie, Invité
  • Jordane Lorandel, Maître de conférences, CY Cergy Paris Université/ETIS, Encadrant
  • Emmanuelle Bourdel, HDR, ENSEA/ETIS, Directrice de thèse