Robust codes and joint source-channel codes for multimedia transmission over mobile channels

Hervé Jégou 1
1 TEXMEX - Multimedia content-based indexing
IRISA - Institut de Recherche en Informatique et Systèmes Aléatoires, Inria Rennes – Bretagne Atlantique
Abstract : Some new error-resilient source coding and joint source/channel coding techniques are proposed for the transmission of multimedia sources over error-prone channels. First, we introduce a class of entropy codes providing unequal error-resilience, i.e. providing some protection to the most sensitive information. These codes are then extended to exploit the temporal dependencies. A new state model based on the aggregation of some states of the trellis is then proposed and analyzed for soft source decoding of variable length codes with a length constraint. It allows the weighting of the compromise between the estimation accuracy and the decoding complexity. Next, some paquetization methods are proposed to reduce the error propagation phenomenon of variable length codes. Finally, some re-writing rules are proposed to extend the binary codetree representation of entropy codes. The proposed representation allows in particular the design of codes with improved soft decoding performances.
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  • HAL Id : tel-01171129, version 1

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Hervé Jégou. Robust codes and joint source-channel codes for multimedia transmission over mobile channels. Signal and Image Processing. Université de Rennes 1, 2005. English. ⟨tel-01171129⟩

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