Transmission security is a major concern in an increasingly connected world, where electronic devices play a central role in our daily lives. Rapid technological advances have led to a growing dependence on connected objects, from smartphones to medical devices to autonomous vehicles. This issue is also reflected in global geopolitics, with various attempts to intimidate or even intercept strategic communications. This digital omnipresence raises crucial questions about the security of transmissions, which are often vulnerable to a variety of threats.

In this research project, we propose to focus on securing the physical layer of communications systems, in addition to cryptography-based security. Our aim is to protect the integrity of a message against interception, as well as its stealth character, i.e. the ability of a third party not to detect transmissions between a transmitter and several receivers.

The research work will focus on the concept of 'Faster-than-Nyquist'. This technique refers to an approach to data transmission that violates the Nyquist rule in terms of sampling frequency. The Nyquist rule stipulates that, to avoid loss of information when transmitting signals, the sampling frequency must be at least twice the maximum signal frequency. In the context of 'Faster-than-Nyquist', the idea is to explore transmission methods that exceed this theoretical limit for the purpose of transmission security. Indeed, by exceeding the conventional sampling frequency, there is an increase in interference and in the level of transmission errors. The understanding, mastery and appropriate use of this technique will be at the heart of this research work.

Based on the laboratory's expertise in digital, IoT, satellite, 5G and 6G communications, the PhD student will be supported in his or her research by experts in the field. Advanced digital signal processing and rapid prototyping tools will be used to experimentally validate theoretical concepts. The research work will integrate (i) bibliographical studies (ii) understanding and proposing new transmission schemes (iii) validation by numerical simulations and/or demonstrators (iv) dissemination work including, filing patents, writing and presenting work in international journals and conferences.

Why join us?
- Experience at the cutting edge of innovation, with strong development potential
- A position in the heart of the Grenoble metropolitan area Capitals of the French Alps), easily accessible via the soft mobility encouraged by the CEA,
- A recognized work-life balance, (28 + 24 (RTT) paid leave, remote working possible (2 days/week)
- A salary of 2406€/year for 3 years.
- An active work council in terms of leisure and extra-professional activities, on-site catering.

About us: http://www.leti-cea.com/cea-tech/leti/english/Pages/Applied-Research/Technology-Fields/wireless-communication-networks.aspx