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Vers une solution réaliste de décodage source-canal conjoint de contenus multimédia

Abstract : In the context of video transmission over mobile networks, pictures have to be strongly compressed to fit within the reduced available bandwidth. However, the more the data is compressed, the more it is senstive to transmission errors. To insure an error-free signal at the video decoder input, several mechanisms are integrated into the modern receiver. These techniques mainly consist in retransmitting damaged packets and/or improving protection by adding redundancy to data (channel coding). These methods are efficient but involve high ressource consumption. Recently, joint source-channel decoding (JSCD) concept was proposed to improve the multimedia transmission quality. It consists in using the inherent redundancy in the transmitted data to enhance the decoding quality. In this thesis, we introduce an original JSCD scheme exploiting the semantic and syntactic properties of the multimedia stream along with the error detection codes (CRC) protecting packets. Then, we consider the problematic for integrating JSCD schemes in traditional receivers and demonstrate that several modifications are required to reach a realistic solution. We finally propose an universal principle to simply get round these difficulties based on a new protocol structure management. These techniques have been simulated assuming a point-to-point H.264 video transmission over WiFi channels. Simulation results demonstrate a significant link budget improvement.
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https://tel.archives-ouvertes.fr/tel-00472393
Contributor : Marin Cédric <>
Submitted on : Sunday, April 11, 2010 - 10:30:50 PM
Last modification on : Wednesday, October 14, 2020 - 3:57:00 AM
Long-term archiving on: : Tuesday, September 14, 2010 - 6:04:33 PM

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  • HAL Id : tel-00472393, version 1

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Cédric Marin. Vers une solution réaliste de décodage source-canal conjoint de contenus multimédia. Traitement du signal et de l'image [eess.SP]. Université Paris Sud - Paris XI, 2009. Français. ⟨tel-00472393⟩

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