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arXiv 0903.3024cs.ITmath.IT
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Costa熵幂不等式的向量推广及其应用

A Vector Generalization of Costa's Entropy-Power Inequality with Applications

Ruoheng Liu, Tie Liu, H. Vincent Poor, Shlomo Shamai

摘要:

考虑Costa的一个熵幂不等式,给出了一个带实半正定参数的自然向量推广.利用线性矢量高斯信道中互信息的导数与最小均方误差(MMSE)估计之间的基本关系,利用微扰方法证明了这个新的不等式.作为应用,从广义Costa EPI导出了一个新的极值熵不等式,并利用该不等式建立了具有分层保密消息的退化向量高斯广播信道的保密容量域.

英文摘要:

This paper considers an entropy-power inequality (EPI) of Costa and presents a natural vector generalization with a real positive semidefinite matrix parameter. This new inequality is proved using a perturbation approach via a fundamental relationship between the derivative of mutual information and the minimum mean-square error (MMSE) estimate in linear vector Gaussian channels. As an application, a new extremal entropy inequality is derived from the generalized Costa EPI and then used to establish the secrecy capacity regions of the degraded vector Gaussian broadcast channel with layered confidential messages.

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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