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arXiv 1402.0258cs.ITmath.IT
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一种率失真索引编码方法

A Rate-Distortion Approach to Index Coding

Sinem Unal, Aaron B. Wagner

摘要:

我们的方法索引编码作为一个特殊的情况下,率失真与多个接收器,每个与一些边信息的来源。具体来说,使用率失真问题的技术开发,我们提供了两个上限和一个最佳索引编码率的下限。上限涉及特定的选择的辅助随机变量的率失真问题的现有最佳方案。下界是基于一个新的下界一般率失真问题。所示的边界重合的(组播)索引编码实例的数量,包括所有的实例,解码器的数量不超过三个。

英文摘要:

We approach index coding as a special case of rate-distortion with multiple receivers, each with some side information about the source. Specifically, using techniques developed for the rate-distortion problem, we provide two upper bounds and one lower bound on the optimal index coding rate. The upper bounds involve specific choices of the auxiliary random variables in the best existing scheme for the rate-distortion problem. The lower bound is based on a new lower bound for the general rate-distortion problem. The bounds are shown to coincide for a number of (groupcast) index coding instances, including all instances for which the number of decoders does not exceed three.

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