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2010

Asymmetric multilevel diversity coding and asymmetric Gaussian multiple descriptions

8 years 6 months ago
Asymmetric multilevel diversity coding and asymmetric Gaussian multiple descriptions
We consider the asymmetric multilevel diversity (A-MLD) coding problem, where a set of 2 K 1 information sources, ordered in a decreasing level of importance, is encoded into K messages (or descriptions). There are 2K -1 decoders, each of which has access to a non-empty subset of the encoded messages. Each decoder is required to reproduce the information sources up to a certain importance level depending on the combination of descriptions available to it. We obtain a single letter characterization of the achievable rate region for the 3-description problem. In contrast to symmetric multilevel diversity coding, source-separation coding is not sufficient in the asymmetric case, and ideas akin to network coding need to be used strategically. Based on the intuitions gained in treating the A-MLD problem, we derive inner and outer bounds for the rate region of the asymmetric Gaussian multiple description (MD) problem with three descriptions. Both the inner and outer bounds have a similar ge...
Soheil Mohajer, Chao Tian, Suhas N. Diggavi
Added 22 May 2011
Updated 22 May 2011
Type Journal
Year 2010
Where TIT
Authors Soheil Mohajer, Chao Tian, Suhas N. Diggavi
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