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arXiv 1106.1879cs.ITmath.IT
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混合信源的二阶可分辨性、内在随机性和定长信源编码:信息谱方法

Second-Order Resolvability, Intrinsic Randomness, and Fixed-Length Source Coding for Mixed Sources: Information Spectrum Approach

Ryo Nomura, Te Sun Han

摘要:

考虑了典型随机数生成问题(例如可分解性、固有随机性、固定长度信源编码)中的二阶可实现渐进性。在这些问题中,已有学者利用信息谱方法推导出了一般信源的一阶和二阶可分辨率。这些公式虽然具有一般性,但计算难度很大.因此,试图解决可实现速率的显式计算问题是有意义的。特别地,对于i.i.d.来源,二阶可实现的速率已确定较早简单地使用渐近正态性。在本文中,我们考虑两个独立同分布的混合源。源混合源是非遍历源的一种典型情况,其自信息不具有渐近正态性。尽管如此,我们可以明确地计算二阶可实现率为这些来源的双峰渐近正态性的基础上。此外,扩展我们的结果更一般的混合源,如混合的可数无限i.i.d.源或马尔可夫源,以及i.i.d.来源,考虑。

英文摘要:

The second-order achievable asymptotics in typical random number generation problems such as resolvability, intrinsic randomness, fixed-length source coding are considered. In these problems, several researchers have derived the first-order and the second-order achievability rates for general sources using the information spectrum methods. Although these formulas are general, their computation are quite hard. Hence, an attempt to address explicit computation problems of achievable rates is meaningful. In particular, for i.i.d. sources, the second-order achievable rates have earlier been determined simply by using the asymptotic normality. In this paper, we consider mixed sources of two i.i.d. sources. The mixed source is a typical case of nonergodic sources and whose self-information does not have the asymptotic normality. Nonetheless, we can explicitly compute the second-order achievable rates for these sources on the basis of two-peak asymptotic normality. In addition, extensions of our results to more general mixed sources, such as a mixture of countably infinite i.i.d. sources or Markovian sources, and a continuous mixture of i.i.d. sources, are considered.

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。

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