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Système de télésurveillance médicale utilisant la technologie de transmission optique sans fil

Abstract : This thesis focuses on bidirectional optical wireless communication techniques for the indoor monitoring of medical patient data. More precisely, the uplink uses infrared transmissions between a device carried by the patient and several receivers dispatched on the ceiling. For the downlink, the study deals with Visible Light Communications (VLC) using the lighting of the environment. In order to illustrate the potential of this technology for medical monitoring, the main contribution of this study consists in the evaluation of the infrared and visible channel performance considering a wearable device and patient mobility in the environment. After a general description of optical wireless communications, the thesis focuses on basic principles and characteristics of VLC, in particular the LED which is the key component allowing to provide both lighting and communication. The method used for the optical channel simulation is based on ray-tracing method associated with Monte-Carlo technique permitting a complex modeling of the studied scenario. From VLC channel study, it is shown that in order to carefully predict performance, it is important to model the presence of the patient’s body and to consider the variations induced by its movement on the position and the orientation of the wearable device. Moreover, the impact of body’s reflectivity optical properties cannot be neglected. The overall performance of the Infrared/Visible bidirectional link is then discussed in terms of outage probability for several data rates and qualities of services corresponding to several medical data types. The results highlight the feasibility of the considered monitoring scenario and the potential of optical wireless communication as an alternative for radiofrequencies regarding remote transmission. To conclude, some experimentations contribute to validation for the infrared uplink. Finally, the development of an experimental test bed on the visible downlink opens the way for future tests in order to validate the overall theoretical performances.
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https://tel.archives-ouvertes.fr/tel-01703408
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Submitted on : Wednesday, February 7, 2018 - 6:37:07 PM
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Clément Le Bas. Système de télésurveillance médicale utilisant la technologie de transmission optique sans fil. Optique / photonique. Université de Limoges, 2017. Français. ⟨NNT : 2017LIMO0087⟩. ⟨tel-01703408⟩

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