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Eigenvalue Estimates and Mutual Information for the Linear Time-Varying Channel

机译:线性时变信道的特征值估计和互信息

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摘要

We consider linear time-varying channels with additive white Gaussian noise. For a large class of such channels we derive rigorous estimates of the eigenvalues of the correlation matrix of the effective channel in terms of the sampled time-varying transfer function and, thus, provide a theoretical justification for a relationship that has been frequently observed in the literature. We then use this eigenvalue estimate to derive an estimate of the mutual information of the channel. Our approach is constructive and is based on a careful balance of the tradeoff between approximate operator diagonalization, signal dimension loss, and accuracy of eigenvalue estimates.
机译:我们考虑具有加性高斯白噪声的线性时变信道。对于大量此类信道,我们根据采样的时变传递函数得出有效信道相关矩阵特征值的严格估计值,从而为在信道中经常观察到的关系提供了理论依据。文献。然后,我们使用此特征值估计来得出信道互信息的估计。我们的方法是建设性的,基于对近似算子对角化,信号维数损失和特征值估计精度之间的权衡取舍。

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