Fondé en 1987, STMicroelectronics est aujourd’hui le premier fabricant européen de semi-conducteurs avec plus de 53 000 collaborateurs et est présent dans 36 pays. Nos composants sont au cœur de tous les systèmes électroniques de télécommunication, informatique, automobile, grand public, cartes à puces… Nous recherchons : Intitulé Descriptif Improved Localization Techniques with Narrowband Communication systems Internet of Things (IoT) is a key concept for sensor network devices to Sense and Collect data from the surrounding world. Collection of such data has to be shared through Internet, where it can be processed and utilized for various innovative applications. Obviously, this new approach provides significant benefits to Industrial and Home/Building automation, Lighting Control, Security and Monitoring for Health and Wellness as well as Agricultural and Environmental applications, to name but a few of the most pervasive ones. This market is expected to reach $290.0 billions by 2017 (Markets&Markets). Among the different information which can be sensed by wireless devices, the positioning is of prime importance. It can open the door to a new range of applications and services (such as tracking people and goods in a warehouse, security control and smart communication network). Up to know, most of the localization techniques exploiting ZigBee or WiFi technology were based on RSSI (Received Signal Strength Intensity) and were offering really poor performances in indoor environment due to the influence of multipath fading. Up to now, the best localization performances have been obtained with Ultra Wideband Technology which can offer up to few cms precision thanks to the 500 MHz bandwidth. However, UWB is severely limited in power emission, rarely available in commercial products and sensitive to any inband blocker. There is a strong interest in developing alternative localization technique. In most of the application, only few tens of cm precision is enough to provide new applications. This can theoretically be reached with classical ZigBee and Bluetooth devices thanks to the 80MHz ISM bandwidth available. To reach such performances, new radio techniques should be developed adapted to the property of narrowband systems. The first step will consist in listing the different approach that can be exploited to implement the ranging measurements of narrowband system such as ZigBee or to improve their performances. Comparison will be made with solutions proposed in undergoing development within the Bluetooth alliance Then, the theoretical limits of the proposed approach will be evaluated. Afterward, simulation chains will be developed in order to evaluate the detailed performance of the localization techniques. The simulation will be based on precise models of the transceiver and classical wideband channel models. If needed, modification of the transceiver will be considered, keeping the compatibility with the existing solutions and assuming that these modifications do not impact its power consumption and its cost . Lastly, the best solution will be selected by potentially exploiting sensor fusion techniques. At the end, the proposed approach will be demonstrated in real environment(Due to timing constraint, the demonstration will be limited to the algorithms and digital sections - using FPGa board. keeping unchanged the RF section of the transceiver –reuse of an existing transceiver-) Niveau d’étude requis / Compétences requises / Dates et lieu de la thèse Contact Thèse conjointe entre la société STMicroelectronics et le laboratoire CEA-LETI. - Bruno PAILLE, [email protected]