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Annonce

25 octobre 2017

PhD proposal offer


Catégorie : Doctorant


PhD position offer "Stratospheric Platform for 4G / 5G Coverage: Adaptive cellular coverage design, optimization and advanced signal processing" fully funded at CentraleSupélec / LSS, contact: jocelyn.fiorina@centralesupelec.fr

 

PhD proposal

starting between October and December 2017

at the LSS laboratory, in collaboration with cell&sat (fully funded, possible job position after the thesis)

Contact : jocelyn.fiorina@centralesupelec.fr
Tel : 0033.1.69.85.14.58

Topic :

Stratospheric Platform for 4G / 5G Coverage: Adaptive cellular coverage design, optimization and advanced signal processing

Introduction

High Altitude Platforms (HAP) are a new type of infrastructure for mobile networks which allow to extend the 4G/5G cellular coverage to low density rural area, or to provide a solution to emergency situations.

In HAP system, a 4G base station is placed on board of a nacelle on a platform - dirigible or balloon - located in the lower part of the stratosphere, at about 20 km of altitude. Thanks to directive antennas or to beamforming exploiting multi-antennas, a cellular network may be created on the ground, with the advantage, contrary to classical terrestrial networks, to have a centralized management of the cells and of their interferences in one base station (on the nacelle) as opposed to a distributed network of base stations at the ground.

Balloons and stratospheric airplanes have created a great amount of attention in the international scientific community since the beginning or years 2000. And recently, new HAP solutions have been proposed : Google Loon, Facebook Aquila or Stratobus by Thales https://www.thalesgroup.com/fr/monde/espace/press-release/stratobus-decolle. Those new systems enlarge the fields of applications and motivate today new research works.

Problematic

HAP specificities (specific channel model, centralized communications as opposed to terrestrial communications, fixed central station as opposed to low orbit satellite communication, low delay and distance with respect to satellite communications) make the solutions designed for terrestrial or satellite communications suboptimal. It is why new resource allocations algorithms have to be designed and compared in term of coverage quality and overall throughput offered to users.

Thus, the topic of this thesis aim at exploiting the advantage of HAP, taking into account its constraints (energy consumption problem, movement due to the wind…) in order to optimize the performance and the resource:

Some references

[1] T.C. Tozer, D. Grace, “High-altitude Platforms for Wireless Communications” IEEE Comm. Mag., June 2001.

[2] Fernando Ulloa-Vasquez, J.A. Delgado-Penin, “Performance Simulation of High Altitude Platforms (HAPs) Communication Systems”, Report on EC-sponsored IST Project Helinet.

[3] Jose Luis Cuevas-Ruiz, Jose A. Delgado, “A Statistical Switched Broadband Channel Model for HAPs Links”, IEEE Comm. Mag., March 2004.

[4] Fabio Dovis, Roberto Fantini, et al, “Small-scale Fading for High Altitude Platform (HAP) Propagation Channels”, IEEE Comm. Mag., April 2002

[5] Stratospheric Propagation And HAPs Channel Modeling, thesis submitted by Andrew Ayoola Oluseyi Olapido ,Blekinge Institute of Technology

[6] High Altitude Platform Stations: An Opportunity to Close the Information Gap. ITU Report on ITU Question 9/2

[7] Struzak R: Emergency Telecommunications with and in the Field; United Nations Office for the Coordination of Humanitarian Affairs, 2000

[8] Struzak R: Satellite Industries at the Turn of the Century; International Communications (the same issue)

[9] Thornton J, Grace D, Spillard C, Konefal T, Tozer T C: Broadband Communications from a High-altitude Platform: the European HeliNet Programme; Electronics & Communication Engineering Journal, June 2001, pp. 138-144

[10) Tozer T C, Grace D: High-altitude Platforms for Wireless Communications; Electronics & Communication Engineering Journal, June 2001, pp. 127-137

LSS - LABORATOIRE DES SIGNAUX ET SYSTÈMES
Unité mixte de recherche 8506
CentraleSupélec - CNRS - Paris-Saclay University

Contact: jocelyn.fiorina@centralesupelec.fr
Tel : 0033.1.69.85.14.58

 

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