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Gaussian Multiterminal Source Coding with Several Side Informations at the Decoder

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1 Author(s)
Oohama, Y. ; Dept. of Comput. Sci. & Commun. Eng., Kyushu Univ., Fukuoka

In this paper we consider the separate coding problem for L +1 correlated Gaussian memoryless sources. We deal with the case where L separately encoded data of sources work as side information at the decoder for the reconstruction of the remaining source. The determination problem of the rate distortion region for this system is the so called many-help-one problem and has been known as a highly challenging problem. The author determined the rate distortion region in the case where the L sources working as partial side information are conditionally independent if the remaining source we wish to reconstruct is given. This condition on the correlation is called the CI condition. In this paper we extend the author's previous result to the case where L + 1 sources satisfy a kind of tree structure on their correlation. We call this tree structure of information sources the TS condition. This condition contains the CI condition as a special case. In this paper we derive an explicit outer bound of the rate distortion region when information sources satisfy the TS condition. Furthermore, we show that for L = 2 this outer bound coincides with the rate distortion region. We also present a sufficient condition for the outer bound to coincide with the rate distortion region

Published in:

Information Theory, 2006 IEEE International Symposium on

Date of Conference:

9-14 July 2006

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