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When Is Joint SourceChannel Coding Worthwhile: An Information Theoretic Perspective 1
 

Summary: When Is Joint Source­Channel Coding Worthwhile:
An Information Theoretic Perspective 1
Yangfan Zhong, Fady Alajaji and L. Lorne Campbell
Dept. of Mathematics and Statistics
Queen's University, Kingston, Ontario, Canada, K7L 3N6
{yangfan, fady, campblll}@mast.queensu.ca
Abstract --- We study, from an information the­
oretic perspective, the merits of joint source­
channel (JSC) coding versus traditional tan­
dem coding, which consists of separately per­
forming and concatenating source and channel
coding. Specifically, we provide a systematic
comparison of the JSC coding error exponent
EJ (Q, W ) with the tandem coding error expo­
nent ET (Q, W ) for communication systems with
discrete memoryless source and channel pairs
(Q, W ). We establish su#cient conditions under
which EJ (Q, W ) > ET (Q, W ), which are satisfied
for a large class of (Q, W ) pairs. We also show
that EJ (Q, W ) can sometimes be twice as large as

  

Source: Alajaji, Fady - Department of Mathematics and Statistics, Queen's University (Kingston)
Linder, Tamás - Department of Mathematics and Statistics, Queen's University (Kingston)

 

Collections: Engineering