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Advanced simulation of the wireless optical channel in complex environments.

ABG-89536 Sujet de Thèse
14/01/2020 < 25 K€ brut annuel
CNRS UNIVERSITE DE POITIERS
Poitiers - Nouvelle Aquitaine - France
Advanced simulation of the wireless optical channel in complex environments.
  • Télécommunications
  • Informatique
  • Numérique
Propagation, Optical Wireless Communications, Simulation, Monte-Carlo, Ray-Tracing, Participating media

Description du sujet

The SYCOMOR team of the XLIM laboratory (UMR CNRS 7252) is developing the Rapsor propagation simulation software which, in optics, relies on a 3D ray launching kernel combined with stochastic integration methods such as Monte Carlo. It allows to take into account, depending on the wavelength considered, the characteristics of the sources (Leds), those of the receivers (photodiodes) and the reflective properties of the materials composing the propagation environment. This latter potential of the software is crucial to determine the performances of established links without visibility, i.e. using reflections (diffuse propagation). Most studies on VLC and Lifi communications neglect diffuse links and consider only the most significant direct link. However, recent work shows that in some scenarios it is not sufficient and that it is important to assess the impact of the reflected links.

 

The general objective of this thesis is to continue the activities of SYCOMOR relating to the simulation of wireless optical channels, with the overall aim of further improving their level of accuracy. Improvements are needed at several levels. Firstly, the light sources for which the radiation models are now monochromatic will have to incorporate a multi spectral aspect. Then the reflection models of the reflecting surfaces will have to be enriched with new types of specific materials, such as not perfectly diffused, specular (mirror type) materials or partially transparent such as some plastics or glass. In addition, the properties of reception sensors (photodiodes) will need to be modelled more accurately taking into account the specific radiation pattern, and not simply a binary Field of View (light contribution captured or not captured).Finally, the aim will be to propose new simulation algorithms to take account of new environmental effects and very little studied in the literature. It is an upstream study of the impact of participating media on light propagation. A participant medium is a homogeneous or non-homogeneous volume composed of absorbing particles and partially diffusing light, thus having a strong impact on the performance of optical communications systems. Different types of participating environments can be identified depending on the intended application contexts that are:

  • The deployment of optical technology in an indoor environment that cannot be modelled by open space (presence of smoke or water vapour), corresponding to various applications for aeronautics, industries, buildings, etc.
  • Sensor networks on or even in the body: the participating environment implemented in this framework is either the human skin in the case of a sensor placed on/near the skin, or the human body itself in the case of a communicating implant (subcutaneous or cochlear implant).

For the realization of all the envisaged improvements, at each level of the simulation chain and in each context of the intended application, specific constraints and scientific locks will be identified and solutions proposed for the implementation of realistic modelling of the wireless optical propagation channel for VLC/LiFi communications.

Prise de fonction :

01/10/2020

Nature du financement

Contrat doctoral

Précisions sur le financement

Présentation établissement et labo d'accueil

CNRS UNIVERSITE DE POITIERS

The doctoral student will carry out his thesis work within the SYCOMOR (Optical and Radio Communications Systems) team of the SRI (Intelligent Systems and Networks) axis of the XLIM Institute (UMR CNRS 7252). This team is made up of about fifteen permanent employees spread over the sites of Poitiers, Limoges and Angoulême. The Poitiers’ part of the SYCOMOR team, which will host the doctoral student, is made up of 6 permanent members and is located on the Futuroscope site of the laboratory, within the SP2MI buildings.

This team has been developing expertise in the field of wireless, historically radio-frequency and more recently optical communications systems for many years. In particular, it conducts research on the simulation and modeling of wireless propagation channels. This work led to the development of the software Rapsor (Ray Propagation Simulator) simulating the propagation of radio and optical waves in a realistic 3D environment, on which will be based the work developed within the framework of this thesis.

Intitulé du doctorat

Optoélectronique et micro-ondes

Pays d'obtention du doctorat

France

Etablissement délivrant le doctorat

Université de Poitiers

Ecole doctorale

SISMI (Sciences et Ingénierie des Systèmes, Mathématiques, Informatique)

Profil du candidat

There will be interest in two types of application profiles:

  • Profile 1: informatics training with interest/knowledge in the field of wireless telecommunications;
  • Profile 2: Telecom training with interest/skills in informatics development.

 

The work will also require signal processing and probability skills.

 

Date limite de candidature

30/03/2020
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