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Jonathan Ledy

17
Documents

Présentation

Research Topics --------------- **Vehicular Adhoc NETworks simulations** - Propagation models - Routing protocols - Cross-layering - Link-failure prediction Thesis ------ My thesis deals with the optimization of communications in vehicular networks by using a realistic simulation platform. A realistic environment implies the usage of mobility models adapted to vehicles and also highly detailed physical models (channel models and digital transmission chain). The first part of our work has consisted in the design of a realistic simulation platform dedicated to VANETs (Vehicular Ad hoc NETworks). This platform has been completed by a semi-deterministic propagation model which we have designed. This model called UM-CRT has the advantage to have the same level of realism than a deterministic model while requiring much less computation time. This model has been validated by comparison with a deterministic ray tracing simulator. We then have used this platform to evaluate routing protocols. The efficiency of different ad hoc routing protocols in realistic conditions has led us to focus our study on the family of reactive protocols. From this evaluation we have selected AODV (Ad hoc On demand Distance Vector) to which we have applied a cross-layer metric in order to reduce the performance degradation caused by the realistic environment. We then have used a tuning technique with reactive protocols. Finally, we have evaluated several SISO and MIMO physical layers. This work shows that only improvements combined at different levels (physical and network) can yield a significant increase in performance.
Research Topics --------------- **Vehicular Adhoc NETworks simulations** - Propagation models - Routing protocols - Cross-layering - Link-failure prediction Thesis ------ My thesis deals with the optimization of communications in vehicular networks by using a realistic simulation platform. A realistic environment implies the usage of mobility models adapted to vehicles and also highly detailed physical models (channel models and digital transmission chain). The first part of our work has consisted in the design of a realistic simulation platform dedicated to VANETs (Vehicular Ad hoc NETworks). This platform has been completed by a semi-deterministic propagation model which we have designed. This model called UM-CRT has the advantage to have the same level of realism than a deterministic model while requiring much less computation time. This model has been validated by comparison with a deterministic ray tracing simulator. We then have used this platform to evaluate routing protocols. The efficiency of different ad hoc routing protocols in realistic conditions has led us to focus our study on the family of reactive protocols. From this evaluation we have selected AODV (Ad hoc On demand Distance Vector) to which we have applied a cross-layer metric in order to reduce the performance degradation caused by the realistic environment. We then have used a tuning technique with reactive protocols. Finally, we have evaluated several SISO and MIMO physical layers. This work shows that only improvements combined at different levels (physical and network) can yield a significant increase in performance.

Publications

From a classic Renault Twizy towards a low cost autonomous car prototype: a proof of concept

Rodolfo Orjuela , Jean-Philippe Lauffenburger , Jonathan Ledy , Michel Basset , Joël Lambert
IFAC World Congress, Jul 2020, Berlin, Germany
Communication dans un congrès hal-02976969v1

Characterization of the impact of visual odometry drift on the control of an autonomous vehicle

Stephane Bazeille , Thomas Josso-Laurain , Jonathan Ledy , Martin Rebert , Mohamad Al Assaad
2020 IEEE Intelligent Vehicles Symposium (IV), Oct 2020, Las Vegas, United States. pp.2037-2043, ⟨10.1109/IV47402.2020.9304687⟩
Communication dans un congrès hal-03109474v1

Obstacle Avoidance, Path Planning and Control for Autonomous Vehicles

Hind Laghmara , Mohamed Boudali , Thomas Laurain , Jonathan Ledy , Rodolfo Orjuela
2019 IEEE Intelligent Vehicles Symposium, Jun 2019, Paris, France
Communication dans un congrès hal-02153577v1
Image document

UM-CRT : Un modèle de canal semi-déterministe pour les VANETs

Jonathan Ledy , Hervé Boeglen , Anne-Marie Poussard , Benoit Hilt , Rodolphe Vauzelle
17e Journées Nationales Micro-ondes, May 2011, Brest, France. pp.4E-14
Communication dans un congrès hal-00658995v1
Image document

Realistic wireless communication simulations for VANETS

Rodolphe Vauzelle , Jonathan Ledy , Anne-Marie Poussard , Hervé Boeglen , Benoit Hilt
Electronics, Computers and Artificial Intelligence - ECAI 2011 ­ International Conference - 4th Edition, Jun 2011, Piteşti, Romania
Communication dans un congrès hal-00677391v1
Image document

A survey of V2V channel modeling for VANET simulations

Hervé Boeglen , Benoit Hilt , Pascal Lorenz , Jonathan Ledy , Anne-Marie Poussard
The 8th International Conference on Wireless On-demand Network Systems and Services - WONS 2011, Jan 2011, Bardonecchia, Italy
Communication dans un congrès hal-00658989v1
Image document

UM-CRT model optimisation

Slimane Bouhadi , Jonathan Ledy , Anne-Marie Poussard
Journées Nationales des Communications dans les Transports Terrestres, Nov 2011, Colmar, France
Communication dans un congrès hal-00658998v1

Performance comparison of BER-based routing protocols under realistic conditions

Tiguiane Yélémou , Jonathan Ledy , Benoit Hilt , Anne-Marie Poussard , Philippe Meseure
36th IEEE Conference on Local Computer Networks, Oct 2011, Bonn, Germany. 4 p
Communication dans un congrès hal-00633732v1

Impact d'un modèle de propagation réaliste sur un protocole de routage pour les VANETs

Jonathan Ledy , Hervé Boeglen , Abdelhafid Abouaissa , Benoit Hilt , Rodolphe Vauzelle
GDR ONDES et GDR ISIS, Mar 2010, Paris, France
Communication dans un congrès hal-00658971v1
Image document

A semi-deterministic channel model for VANETs simulations

Jonathan Ledy , Mahamadi Savadogo , Hervé Boeglen , Anne-Marie Poussard , Benoit Hilt
Intelligent Transport Systems Telecommunications 2010, Nov 2010, Kyoto, Japan. pp.A Semi-Deterministic Channel Model for VANETs Simulations
Communication dans un congrès hal-00658982v1
Image document

An Enhanced AODV Protocol for VANETs with Realistic Radio Propagation Model Validation

Jonathan Ledy , Hervé Boeglen , Benoit Hilt , Hafid Abouaissa , Rodolphe Vauzelle
ITST 2009, Oct 2009, Lille, France. pp.5
Communication dans un congrès hal-00476738v1