EXIT Analysis for MAP-Based Joint Iterative Decoding of Separately Encoded Correlated Sources

Kentaro KOBAYASHI  Takaya YAMAZATO  Masaaki KATAYAMA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E93-B   No.12   pp.3509-3513
Publication Date: 2010/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.3509
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Wireless Distributed Networks)
Category: 
Keyword: 
EXIT analysis,  correlated sources,  joint decoding,  iterative decoding,  distributed coding,  

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Summary: 
We develop a mathematical framework for the extrinsic information transfer (EXIT) analysis to assess the convergence behavior of maximum a posteriori (MAP)-based joint iterative decoding of correlated sources, which are separately encoded and transmitted over noisy channels. Unlike the previous work, our approach focuses on the case side information about the correlation is not perfectly given at the joint decoder but is extracted from decoder output and updated in an iterative manner. The presented framework provides a convenient way to compare between schemes. We show that it allows us to easily and accurately predict joint decoding gain and turbo cliff position.