Separating distributed source coding from network coding

This correspondence considers the problem of distributed

source coding of multiple sources over a network with multiple receivers.

Each receiver seeks to reconstruct all of the original sources. The work by

Ho et al. 2004 demonstrates that random network coding can solve this

problem at the potentially high cost of jointly decoding the source and

the network code. Motivated by complexity considerations we consider

the performance of separate source and network codes. Previous work by

Effros et al. 2003 demonstrates the failure of separation between source

and network codes for nonmulticast networks. We demonstrate that failure

for multicast networks. We study networks with capacity constraints on

edges. It is shown that the problem with two sources and two receivers is

always separable. Counterexamples are presented for other cases.

RamamoorthyJCE06.pdf
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In  IEEE Trans. Information Theory

Publisher  Institute of Electrical and Electronics Engineers, Inc.
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