On the Separation of Lossy Source-Network Coding and Channel Coding in Wireline Networks

Details On the Separation of Lossy Source-Network Coding and Channel Coding in Wireline Networks On the Separation of Lossy Source-Network Coding and Channel Coding in Wireline Networks

2010-05-02

arxiv.org/abs/1005.0117v1

Computer Science

Information Theory

5 pages, to appear in the proceedings of 2010 IEEE International Symposium on Information Theory (ISIT)

Scientific paper

This paper proves the separation between source-network coding and channel coding in networks of noisy, discrete, memoryless channels. We show that the set of achievable distortion matrices in delivering a family of dependent sources across such a network equals the set of achievable distortion matrices for delivering the same sources across a distinct network which is built by replacing each channel by a noiseless, point-to-point bit-pipe of the corresponding capacity. Thus a code that applies source-network coding across links that are made almost lossless through the application of independent channel coding across each link asymptotically achieves the optimal performance across the network as a whole.

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