arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.4612cs.ITmath.IT
收藏

网络编码容量:一个函数依赖界

Network Coding Capacity: A Functional Dependence Bound

Satyajit Thakor, Alex Grant, Terence Chan

摘要:

多信源网络编码容量域(甚至是容量界)的明确表征和计算是一个长期存在的问题。事实上,找到容量区域需要确定所有熵向量的集合$Γ^{*}$,这是已知的极其困难的问题。另一方面,计算显式已知的线性规划界是非常困难的,在实践中,由于指数增长的复杂性作为网络规模的函数。我们给出了一个新的,易于计算的外界,网络中的所有功能依赖的特征的基础上。我们还表明,建议的界限是严格的比一些已知的界限。

英文摘要:

Explicit characterization and computation of the multi-source network coding capacity region (or even bounds) is long standing open problem. In fact, finding the capacity region requires determination of the set of all entropic vectors $Γ^{*}$, which is known to be an extremely hard problem. On the other hand, calculating the explicitly known linear programming bound is very hard in practice due to an exponential growth in complexity as a function of network size. We give a new, easily computable outer bound, based on characterization of all functional dependencies in networks. We also show that the proposed bound is tighter than some known bounds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑