arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.08807cs.ITmath.ITmath.PRmath.STstat.TH
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高维时间序列的频域检测

On the frequency domain detection of high dimensional time series

A Rosuel, P. Vallet, P Loubaton, X. Mestre

摘要:

在本文中,我们解决的问题的检测,在频域中,M维时间序列建模为一个M × K MIMO滤波器的输出驱动的K维高斯白噪声,并由加性M维高斯有色噪声干扰。我们认为,研究的检验统计量的基础上的频谱相干矩阵(SCM)作为重正化的平滑周期图矩阵的观测时间序列在N个样本,并与平滑跨度B。为了这个目的,我们考虑的渐近制度,其中M,B,N都收敛到无穷大在某些特定的速率,而K保持不变。我们证明了SCM可以近似在运营商的范数由相关的Wishart矩阵,随机矩阵理论(RMT)提供了一个精确的描述的渐近行为的特征值。然后利用这些结果来研究基于SCM的最大特征值的检验的一致性,并提供一些数值例子来评估这样的检验的统计性能。

英文摘要:

In this paper, we address the problem of detection, in the frequency domain, of a M-dimensional time series modeled as the output of a M x K MIMO filter driven by a K-dimensional Gaussian white noise, and disturbed by an additive M-dimensional Gaussian colored noise. We consider the study of test statistics based of the Spectral Coherence Matrix (SCM) obtained as renormalization of the smoothed periodogram matrix of the observed time series over N samples, and with smoothing span B. To that purpose, we consider the asymptotic regime in which M, B, N all converge to infinity at certain specific rates, while K remains fixed. We prove that the SCM may be approximated in operator norm by a correlated Wishart matrix, for which Random Matrix Theory (RMT) provides a precise description of the asymptotic behaviour of the eigenvalues. These results are then exploited to study the consistency of a test based on the largest eigenvalue of the SCM, and provide some numerical illustrations to evaluate the statistical performance of such a test.

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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