Digital correction of the health status of an electrical network
Cable faults are generally detected when communication is interrupted, resulting in significant repair costs and downtime. Additionally, data integrity becomes a major concern due to the increased threats of attacks and intrusions on electrical networks, which can disrupt communication. Being able to distinguish between disruptions caused by the degradation of the physical layer of an electrical network and an ongoing attack on the energy network will help guide decision-making regarding corrective operations, particularly network reconfiguration and predictive maintenance, to ensure network resilience. This study proposes to investigate the relationship between incipient faults in cables and their impact on data integrity in the context of Power Line Communication (PLC). The work will be based on deploying instrumentation using electrical reflectometry, combining distributed sensors and AI algorithms for online diagnosis of incipient faults in electrical networks. In the presence of certain faults, advanced AI methods will be applied to correct the state of the health of the electrical network's physical layer, thereby ensuring its reliability.
Optomechanical resonators in chaotic regime for cryptography in optical datacoms
The aim of the post doc is to explore the use of optomechanical resonators placed in a chaotic regime to secure optical communications. It is part of a project from the CEA's research-at-risk program, selected in July 2024. A key point is to obtain a highly non-linear regime, favored by specific geometries, necessary for the richness of chaos. Exploiting the unique properties of chaos for secure data transfer will be explored by the postdoc as part of a working group.
With the advent of the quantum computer, current techniques for securing information exchange become largely compromised, necessitating the development of post-quantum cryptography techniques. Beyond software approaches, new hardware concepts have emerged, such as chaotic cryptography. In this context, it is becoming essential to develop chaos sources that are high-quality (richness of parameter space), compatible with existing communication systems and compact. While lasers are a well-known source of chaos, optomechanical systems seem particularly well suited to this application, as the mechanical domain provides an enriched parameter space, while retaining high data throughput and a direct connection with optical communications systems. The postdoc will explore the suitability of chaotic optomechanical devices for implementing hardware cryptography.
Evaluation of RF system power consumption for joint system-technology optimization
To be able to increase and optimize wireless transmission systems based on a hybridization of technologies, it is strategic to be able to quickly evaluate the capabilities of these technologies and to adapt the associated architecture as best as possible. To this end, it is necessary to implement new approaches to global power management and optimization.
The work of this post-doctoral contract is at this level.
The first step will be to develop some new power consumption models of the RF transceivers building blocks (LNA, Mixer, Filter, PA, …). A modelization approach has already been tested and validated in the group. In the next step, it will be needed to link the performances of the overall wireless system to the building blocks characteristics. Lastly, the optimization will be applied thanks to an efficient solution. Lastly, the proposed approach will be validated in the optimisation of a multi-antenna millimeter wave wireless system. An evaluation methodology specific to 3D will also be put in place