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arXiv 2002.02716cs.ITmath.IT
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关于连续时间AWGN信道的采样

On Sampling Continuous-Time AWGN Channels

Guangyue Han, Shlomo Shamai

摘要:

对于具有可能反馈的连续时间加性高斯白噪声(AWGN)信道,已经表明,随着采样变得无限精细,关联离散时间信道的互信息收敛到原始连续时间信道的互信息。我们在本文中给出了更多的定量加强这一结果,其中,除其他影响外,表征如何过采样方法的带宽限制的连续时间高斯信道的真实互信息。我们的结果中的假设相对温和。特别是,对于非反馈的情况下,相比Shannon-Nyquist采样定理,一个广泛使用的工具,连接连续时间高斯信道到他们的离散时间对应的,需要的信道输入的带限性,我们的结果只需要一些可积性条件的输入功率谱密度函数。

英文摘要:

For a continuous-time additive white Gaussian noise (AWGN) channel with possible feedback, it has been shown that as sampling gets infinitesimally fine, the mutual information of the associative discrete-time channels converges to that of the original continuous-time channel. We give in this paper more quantitative strengthenings of this result, which, among other implications, characterize how over-sampling approaches the true mutual information of a continuous-time Gaussian channel with bandwidth limit. The assumptions in our results are relatively mild. In particular, for the non-feedback case, compared to the Shannon-Nyquist sampling theorem, a widely used tool to connect continuous-time Gaussian channels to their discrete-time counterparts that requires the band-limitedness of the channel input, our results only require some integrability conditions on the power spectral density function of the input.

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