researResearch - Télécom Bretagne

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researResearch
Following these results and the conclusions of an
economic study carried out by the Technopôle
Quimper-Cornouaille, the Brittany region validated
the second phase of the project. This phase consists
of developing and setting up a demonstrator
comprising a base station and three ships.
The ex-TREME project (labelled by Mer Bretagne),
proposes setting up a high-rate connection between
land and an embedded IP platform. This open
platform is destined to exchange enriched, highrate,
sensitive data with land-based sites. The
solution will allow processing and diffusing data
received from passenger terminals and crew
members continuously in a difficult maritime
environment. The partnership is between Thomson-
Grass Valley, Alcatel, C2 Innovativ-systems,
Morgan’conseil, Ifremer, Télécom Bretagne,
a) The IFREMER ship Thalia
Chantiers de l’Atlantique and Technopôle Brest-
Iroise. Transmission systems, such as Wimax, Wifi,
operate in frequency ranges whose propagation in a
maritime environment is not well mastered
especially in the agitated and metallic environment
of ships.
Several measurement campaigns at sea, using
channel analysis equipment and WiMax
communication systems (bands 3.4 and 5,4 GHz)
allowed to validate the two rays maritime
model.,Fading phenomena; masking effects caused
by the relief and antenna disturbance by heavy seas
were also shown up.
A joint project with Ifremer started in 2008
concerning the problems of short distance, very
high-rate, underwater radio transmission. In the
context of very deep, seabed observations, we
envisaged adapting low-cost technology, common
in the everyday Hertzien field (Wifi), to this
underwater context. A preliminary study concerning
the characterisation of the propagation
environment, from a theoretical point of view and
through initial experiments up to 18 GHz, was
carried out. The limits of broadcast range were
identified, as well as the necessary bases for
developing solutions for antenna systems adapted
to these environments. This work will continue
within the framework of a thesis co-financed by the
Region of Brittany and Ifremer.
• CAPSYS LSU
A contractualised project was completed for DGA,
in partnership with INEO-Défense and Thalès. This
concerned the elaboration of a demonstrator of a a
single-site detection and positioning system for high
frequency radio transmitters.
Publications
b) Example of one trajectory used
Thesis
PEREIRA Carlos. Etude avancée des canaux de transmission radio en
contexte MIMO : environnements complexes et couplage inter-antennes
très large bande.
Thèse doct, Université de Poitiers, 18 Décembre 2008.
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