07 - Basics of Global Navigation Satellite Systems (GNSS) (CDMA Technology)

Résumé :

Les communicationspar étalement de spectre constituent une réponse efficace aux problèmes detrajets multiples propres à la télécommunication mobile. Plus généralement, cetype de communications est particulièrement adapté aux communications à faiblerapport signal sur bruit. Parmi les différentes techniques d’étalement despectre, ce cours s’intéresse plus particulièrement à celle de l’étalement despectre par codage à l’aide de séquences pseudo-aléatoires, qualifié de codageCDMA pour ‘Code Division Multiple Access’. Cette technique a conduit à un grandnombre d’applications dans le domaine de la géolocalisation (système GPS ouGalileo), des télécommunications sans fils (UMTS WLAN, Bluetooth) mais aussidans le domaine des réseaux de capteurs.

Ce cours est lefruit d’une collaboration entre Prof. Wolfgang Skupin de l’HTWG Konstanz(University of Applied Sciences, Konstanz, Allemagne) et Prof. Stéphane Flamentde l’ENSICAEN (Grande Ecole, Caen, France).

Abstract :

Spread Spectrum Communications are very wellsuited to mobile communications where multipath propagation leads to strongfading. More generally, this kind of communication technique is well suited tolow signal to noise ratio communication channels.  This lecture focuses on spread spectrumcommunications called ‘CDMA’, which stands for ‘Code Division Multiple Access’,where spreading is obtained by coding data with pseudo random binary sequence.CDMA technology is used in many applications such as geolocalisation (GPS,Gallileo), wireless communications (UMTS, WLAN, Bluetooth) or sensors network.

This lecture was designed together with Pr. W.Skupin from HTWG Konstanz (University of Applied Sciences, Konstanz, Germany)and Pr. S.Flament from ENSICAEN (‘GrandeEcole’, Caen, FRANCE).

Prof. Wolfgang Skupin

Pr. Skupin isProfessor at the University of Applied Sciences of Konstanz, HTWG (Germany) inthe field of Telecommunications.  He isan expert in CDMA technology and was thus involved in the European GALILEOprogram aiming at providing a high-precision positioning system upon whichEuropean nations could rely independently from any other similar system likethe US GPS, the Russian GLOSNASS and the Chinese  Compass.

Prof. Stéphane Flament

Pr. Flament is Professorat the National Graduate School  of Engineering of Caen, ENSICAEN (France), inthe field of Electronics. His research domains deal with low noiseinstrumentation and applied physics of magnetic sensors and devices (https://www.greyc.fr/user/99).