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Algorithmes d’optimisation inter-couches pour les réseaux de capteurs sans fil multimédia utilisant la technologie Ultra Wide Band

Abstract : Wireless Sensor Network (WSN) is the set of elements called micro-sensors able to collect data and transmit it via wireless links. In recent years and with the development of hardware elements such as CMOS cameras, the integration of multimedia content has become possible in the WSNs, that leds to the development of Wireless Multimedia Sensor Network (WMSN). The WMSNs requires short-range and high-speed wireless links that support the transmission of multimedia contents such as images and videos in indoor environments, which justifies the use of Ultra Wide Band (UWB) wireless transmission technology, more precisely the IEEE 802.15.3c standard. In order to ensure a better image/video transmission with a certain quality of service over UWB IEEE 802.15.3c system, many robust and efficient source encoders are used on our research work like JPEG and SPIHT for image transmission and H.264/AVC for video transmission. Our contributions in this manuscript focus on improving the quality of service (QoS), firstly for the case of image transmission by the application of various adaptive techniques including unequal error protection UEP at the channel encoder side and hierarchical modulation, hybrid modulation and adaptive OFDM modulation at the modulator side. Secondly, and for the case of video transmission, all the techniques previously mentioned have been applied to improve the quality of transmitted videos at the receiver side. In addition, we acted on the choice of the size of the GOP (Group of Pictures) at H.264 /AVC encoder to show the influence of the GOP size during the video transmission on the errors propagation produced by the noisy multi-path channel. The originality of this thesis is to propose effective techniques for the improvement of transmitted multimedia contents quality through UWB IEEE 802.15.3c system, more precisely the audio visual high rate physical layer mode (AV HRP) while keeping a good QoS and minimizing the rate distortion ratio and exploit the characteristics of WMSNs which are widely used to deploy services in IoT multimedia applications.
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Submitted on : Wednesday, December 8, 2021 - 9:33:26 AM
Last modification on : Monday, February 21, 2022 - 3:38:11 PM

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  • HAL Id : tel-03464520, version 2

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Asma Ben Abdallah. Algorithmes d’optimisation inter-couches pour les réseaux de capteurs sans fil multimédia utilisant la technologie Ultra Wide Band. Traitement du signal et de l'image [eess.SP]. Conservatoire national des arts et metiers - CNAM; École supérieure des communications de Tunis (Tunisie), 2021. Français. ⟨NNT : 2021CNAM1288⟩. ⟨tel-03464520v2⟩

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