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- W2477751107 abstract "Characterising the capacity region for a network can be extremely difficult. Even with independent sources, determining the capacity region can be as hard as the open problem of characterising all information inequalities. The majority of computable outer bounds in the literature are relaxations of the linear programming bound, which involves entropy functions of random variables related to the sources and link messages. When sources are not independent, the problem is even more complicated. Extension of linear programming bounds to networks with correlated sources is largely open. Source dependence is usually specified through a joint probability distribution, and one of the main challenges in extending linear program bounds is the difficulty (or impossibility) of characterising arbitrary dependences via entropy functions. This paper tackles the problem by answering the question of how well entropy functions can characterise correlation among sources. We show that by using carefully chosen auxiliary random variables, the characterisation can be fairly “accurate”. Using such auxiliary random variables, we also give implicit and explicit outer bounds on the capacity of networks with correlated sources. The characterisation of correlation or joint distribution via Shannon entropy functions is also applicable to other information measures, such as Renyi entropy and Tsallis entropy." @default.
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- W2477751107 date "2017-06-01" @default.
- W2477751107 modified "2023-09-24" @default.
- W2477751107 title "Capacity Bounds for Networks With Correlated Sources and Characterisation of Distributions by Entropies" @default.
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- W2477751107 doi "https://doi.org/10.1109/tit.2017.2681078" @default.
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