Vous êtes ici : Accueil » Kiosque » Annonce

Identification

Identifiant: 
Mot de passe : 

Mot de passe oublié ?
Détails d'identification oubliés ?

Annonce

18 février 2021

New Non-Orthogonal Multiple Access Techniques for Joint Radar and Communication system RadCom 6G


Catégorie : Doctorant


Connected vehicles that aim to improve the safety and efficiency of road traffic by using wireless communications are a new paradigm of Intelligent Transportation Systems (ITS). Over the past decades, several communication standards have been developed, either dedicated or cellular standards. Many specifications were defined by telecommunications standard development organizations to meet the requirements of ITS, namely very low end-to-end latency, high reliability, wide communication range, high communication throughput, and high mobility in a very dense network.

To ensure road safety, other requirements are imposed such as obstacle detection and localization. Thus, in the current system where spectral resources are limited, it is essential to mutualize the frequency bands between the radar system and the communication system. This collaborative approach called RadCom has other advantages in terms of integration (low energy consumption, space requirement, weight...etc.).

To ensure road safety, other requirements are imposed such as obstacle detection and localization. Thus, in the current system where spectral resources are limited, it is essential to mutualize the frequency bands between the radar system and the communication system. This collaborative approach called RadCom has other advantages in terms of integration (low energy consumption, space requirement, weight...etc.).

The future 6G make it possible to meet these major demands in terms of data rate, joint estimation of distance and speed of moving targets with low latency [1], [2]. Therefore, New challenges are appearing in terms of spectral and energetic efficiency.

In the context of RadCom systems, the mobility and number of users (vehicles) require the adoption of new designs of the physical layer such as new errors correction encoding, new modulations, equalization techniques and optimal multiple access techniques.


Objectives of thesis:

Conventional multiple access techniques (orthogonal MA), such as TDMA, OFDMA serve a single user in each block of orthogonal radio resources. In the current context of limited spectral and energy resources, this type of techniques is unsuitable or even unacceptable. A key parameter of 5G and 6G communication systems is to relax access constraints by allowing non-orthogonal access to time and frequency resources. These techniques, often referred to as Non-Orthogonal Multiple Access (NOMA), can be exploited differently depending on the application, for example to increase system throughput or to densify the number of connected vehicles [4]. The NOMA techniques allow a fair allocation resources between the different users and between the two functionalities radar and communication, even in poor channel conditions [8]. Existing study in the literature do not consider yet the use of NOMA in the vehicular communications and RadCom applications. These applications raise significant challenges in terms of network density, latency, accuracy, mobility, etc.

The aim of this thesis is to address NOMA techniques to ensure a common RadCom architecture. The student will also have to propose an optimal receiver based on 6G signals capable of overcoming the interference caused by mobility while taking into account the constraints of both communication and obstacle localization. Simplification of this receiver will to allow a less complex implementations.

[1] 3GPPTechnicalSpecificationsGroupRAN:TS38.213(Release15)hysicalLayer Procedures for Control (June 2018)

[2] 3GPP Technical Specifications Group RAN: TS 38.213: NR Physical layer proce- dures for control (Release 15) (June 2018)

[3] Zhijin Qin, Hao Ye, Geoffrey Ye Li, and Biing-Hwang Fred Juang
Deep Learning in Physical Layer Communications, IEEE Wireless Communications ( Volume: 26 , Issue: 2 , April 2019 )

[4] CHUN YEEN HO , (Student Member, IEEE), AND CHEE YEN LEOW , (Member, IEEE) « Cooperative Non-Orthogonal Multiple Access With Physical Layer Network Coding », IEEE access februray 2019

[5] M.Mhedhbi, F.Elbahhar Boukour « Analysis and Evaluation of Pattern Division Multiple Access Scheme Jointed With 5G Waveforms », IEEE access, DOI: 10.1109/ACCESS.2019.2893362PP(99):1-1january 2019.

Lien

https://www.ifsttar.fr/offres-theses/sujet.php?num=2469&num_session=1

Contact:

fouzia.boukour@univ-eiffel.fr

 

Dans cette rubrique

(c) GdR 720 ISIS - CNRS - 2011-2020.