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arXiv 1202.0871cs.ITmath.IT
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一般非均匀采样下的信道容量

Channel Capacity under General Nonuniform Sampling

Yuxin Chen, Yonina C. Eldar, Andrea J. Goldsmith

摘要:

本文推导了在低于奈奎斯特采样率约束下采样模拟信道的基本容量极限。特别是,我们推导出的能力采样模拟通道的一般类的时间保持采样方法,包括不规则的非均匀采样。我们的研究结果表明,最佳的采样结构提取出一组频率,表现出最高的信噪比之间的支持大小等于采样率的所有频谱集。可以通过滤波器组采样或通过调制和滤波的单个分支以及随后的均匀采样来获得次奈奎斯特采样下的容量。在欠奈奎斯特采样下的容量是采样率的单调函数。这些结果表明,最佳的采样方案抑制混叠,采用不规则的非均匀采样不提供容量增益均匀采样集与适当的预处理一大类信道。

英文摘要:

This paper develops the fundamental capacity limits of a sampled analog channel under a sub-Nyquist sampling rate constraint. In particular, we derive the capacity of sampled analog channels over a general class of time-preserving sampling methods including irregular nonuniform sampling. Our results indicate that the optimal sampling structures extract out the set of frequencies that exhibits the highest SNR among all spectral sets of support size equal to the sampling rate. The capacity under sub-Nyquist sampling can be attained through filter-bank sampling, or through a single branch of modulation and filtering followed by uniform sampling. The capacity under sub-Nyquist sampling is a monotone function of the sampling rate. These results indicate that the optimal sampling schemes suppress aliasing, and that employing irregular nonuniform sampling does not provide capacity gain over uniform sampling sets with appropriate preprocessing for a large class of channels.

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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