arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2005.01899stat.MEmath.STstat.TH
收藏

复杂振荡时间序列的频率检测与变点估计

Frequency Detection and Change Point Estimation for Time Series of Complex Oscillation

Hau-Tieng Wu, Zhou Zhou

AI总结:

针对非平稳噪声污染的复杂振荡时间序列,提出高维稠密渐进周期图检验与频域相位调整局部变点检测方法,可渐近准确检测频率与变点,适用于生理信号分析,并建立了相关高斯逼近与bootstrap方法。

摘要:

我们研究在信号受生成机制复杂时变的非平稳噪声污染时,检测其演化振荡模式的问题。本文提出一种高维稠密渐进周期图检验方法,可准确检测所有振荡频率;进一步在频域中应用相位调整的局部变点检测算法,识别振荡模式发生变化的位置。理论上证明,该方法能渐近地以指定概率在精确范围内检测出所有振荡频率及对应变点。本研究的动机源于生理时间序列分析中遇到的振荡频率估计与变点检测问题,通过在睡眠EEG数据的纺锤波检测与估计中的应用,验证了所提方法的实用性。此外,本文还建立了适用于无方差下界的复值高维非平稳时间序列和的高斯逼近方案与重叠块乘子bootstrap方法,该结果本身也具有独立研究价值。

英文摘要:

We consider detecting the evolutionary oscillatory pattern of a signal when it is contaminated by non-stationary noises with complexly time-varying data generating mechanism. A high-dimensional dense progressive periodogram test is proposed to accurately detect all oscillatory frequencies. A further phase-adjusted local change point detection algorithm is applied in the frequency domain to detect the locations at which the oscillatory pattern changes. Our method is shown to be able to detect all oscillatory frequencies and the corresponding change points within an accurate range with a prescribed probability asymptotically. This study is motivated by oscillatory frequency estimation and change point detection problems encountered in physiological time series analysis. An application to spindle detection and estimation in sleep EEG data is used to illustrate the usefulness of the proposed methodology. A Gaussian approximation scheme and an overlapping-block multiplier bootstrap methodology for sums of complex-valued high dimensional non-stationary time series without variance lower bounds are established, which could be of independent interest.

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。

↑