University of Luxembourg

Doctoral Candidate (PhD student) in Waveform Design for 6G Integrated Terrestrial/Non-Terrestrial Networks

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The Interdisciplinary Centre for Security, Reliability and Trust (SnT) invites applications from highly motivated PhD candidates in the general area of edge artificial intelligence (AI) for 6G networks within its Signal Processing and Communications (SIGCOM) research group. SnT carries out interdisciplinary research in secure, reliable and trustworthy ICT systems and services, often in collaboration with industrial, governmental or international partners. For further information, you may refer to:

The research group focuses on wireless/satellite communications and networking and is headed by Prof. Symeon Chatzinotas. The research areas focus on the formulation, modelling, design, and analysis of future 5G and beyond communication networks that are capable of supporting new services in a cost-efficient manner. Use cases of interest include IoT verticals, unmanned aerial vehicles, integrated satellite-space-terrestrial networks, quantum communications and key distribution, spectrum management and coexistence, tactile Internet, and autonomous transportation. As far as technical enablers are concerned, we leverage expertise on massive MIMO cell-free communications, smart-radio environments through the use of intelligent surfaces, machine-type and ultra-reliable and low-latency communications, edge computing and caching, RAN slicing, and network softwarization and visualization. Finally, due to the large-scale nature, complexity, and heterogeneity of 5G and beyond networks, for their analysis and optimization we use tools such as artificial intelligence/machine learning, graph theory and graph-signal processing, and convex/non-convex optimization. Furthermore, our activities are experimentally driven and supported by the SDR CommLab, the SDN Lab, the 5G-Space Lab, our SW Simulators, and our OTA Facilties. For further information, you may refer to:

We’re looking for people driven by excellence, excited about innovation, and looking to make a difference. If this sounds like you, you’ve come to the right place!

Your Role

This is a fully funded position for 3 years (extendable to an additional 4th year) within the large-scale Horizon Europe research project ETHER – sElf-evolving terrestrial/non-Terrestrial Hybrid nEtwoRks, that is to start on 01/01/2023. ETHER is going to provide a framework for the integrated terrestrial/non-terrestrial network ecosystem that involves an efficient and zero-touch resource management, provides solution for key radio access network challenges, and identifies the business opportunities for potential stakeholders. To realize this novel system concept, ETHER relies on a multi-layered and unified space-aerial-terrestrial architecture, leveraging the benefits of Artificial Intelligence/ Machine Learning (AI/ML) for the optimization of the highly complex and heterogeneous “network of networks”. In the context of ETHER, this PhD project will focus on 6G waveform design that can cope with communication scenarios involving high mobility nodes acting as base stations, such as low-earth orbit satellites. In such scenarios. the conventional and currently used in standards Orthogonal Frequency-Division Multiplexing-based waveform exhibits poor performance due to the significant Doppler spread, especially for millimeter-wave bands (28 GHz and above). Hence, the aim is to investigate new waveforms in such scenarios together with the resulting transceiver design that is required. Of particular interest is the Orthogonal Time Frequency Space modulation that transforms the information carried in the Delay-Doppler coordinate system and has proved to be insensitive to Doppler shifts.

The successful candidate will work under the academic supervision of Prof. Björn Ottersten, Prof. Symeon Chatzinotas, and Dr. Konstantinos Ntontin and join a strong and motivated research team.

The position holder will be required to perform the following tasks:

  • Contribute to the European project ETHER – sElf-evolving terrestrial/non-Terrestrial Hybrid nEtwoRks
  • Carry out research in the predefined areas
  • Disseminate results through scientific publications
  • Present results in well-known international conferences and workshops

Your Profile

Qualification: The candidate should possess an M.Sc./M.Eng. Degree in Telecommunication Engineering, signal processing, or a closely related field in Electronic, Electrical and Computer Engineering

Experience: The ideal candidate should have some knowledge and experience in a number of the following topics:

  • Background in wireless and mobile communications with good knowledge of fading channels
  • Strong background in signal theory and digital communications, substantiated by relevant coursework/assignments
  • Interest in combining theory and experiments and well-developed analytic skills
  • Good programming skills in MATLAB and/or C/C++

Here’s what awaits you at SnT

  • A stimulating learning environment. Here post-docs and professors outnumber PhD students. That translates into access and close collaborations with some of the brightest ICT researchers, giving you solid guidance
  • Exciting infrastructures and unique labs. At SnT’s two campuses, our researchers can take a walk on the moon at the LunaLab, build a nanosatellite, or help make autonomous vehicles even better
  • The right place for IMPACT. SnT researchers engage in demand-driven projects. Through our Partnership Programme, we work on projects with more than 55 industry partners
  • Multiple funding sources for your ideas. The University supports researchers to acquire funding from national, European and private sources
  • Competitive salary package. The University offers a 12 month-salary package, over six weeks of paid time off, meal vouchers and health insurance
  • Be part of a multicultural family. At SnT we have more than 60 nationalities. Throughout the year, we organise team-building events, networking activities and more
  • Boost your career. Students can take advantage of several opportunities for growth and career development, from free language classes to career resources and extracurricular activities

But wait, there’s more!

In Short

  • Contract Type: Contrat à durée déterminée 36 Mois (extendable up to 48 months if required)
  • Work Hours: Full Time 40.0 Heures par Semaine
  • Location: Kirchberg
  • Employee and student status
  • Job Reference: UOL05369

The yearly gross salary for every PhD at the UL is EUR 38028 full time

How to apply

Applications should be submitted online and include:

  • Full CV, including:
    • For each degree received or currently enrolled in, provide the degree, institution name, institution city and country, and date (or expected date) of graduation. Include the title and short summary of your final (Bachelor / Master) Thesis if you did one
    • List of publications (if any)
    • Name, affiliation and contact details of three referees
  • Transcript of all modules and results from Bachelor/Master-level courses taken
  • Cover letter with motivations and topics of particular interest to the candidate (approx. 1 page)

All qualified individuals are encouraged to apply.

Early application is highly encouraged, as the applications will be processed upon reception. Please apply formally through the HR system. Applications by email will not be considered.

The University of Luxembourg embraces inclusion and diversity as key values. We are fully committed to removing any discriminatory barrier related to gender, and not only, in recruitment and career progression of our staff.

About the University of Luxembourg

University of Luxembourg is an international research university with a distinctly multilingual and interdisciplinary character. The University was founded in 2003 and counts more than 6,700 students and more than 2,000 employees from around the world. The University’s faculties and interdisciplinary centres focus on research in the areas of Computer Science and ICT Security, Materials Science, European and International Law, Finance and Financial Innovation, Education, Contemporary and Digital History. In addition, the University focuses on cross-disciplinary research in the areas of Data Modelling and Simulation as well as Health and System Biomedicine. Times Higher Education ranks the University of Luxembourg #3 worldwide for its “international outlook,” #20 in the Young University Ranking 2021 and among the top 250 universities worldwide.

Further information

For further information, please contact: Dr. Konstantinos Ntontin (


Doctoral Candidate (PhD student) in Waveform Design for 6G Integrated Terrestrial/Non-Terrestrial Networks
2, avenue de I'Universite Beles, Luxemburg
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The University of Luxembourg, a small-sized institution with an international reach, aims at excellence in research and education.

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