Aliasing in Spectrum of Nonuniformly Sampled Signals

被引：0
|
作者：
Pucik, Jozef [1 ]
Cocherova, Elena [1 ]
Ondracek, Oldrich [1 ]
Stofanik, Vladimir [1 ]
机构：
[1] Slovak Univ Technol Bratislava, Inst Elect & Photon, Ilkovicova 3, Bratislava 81219, Slovakia
来源：
PROCEEDINGS OF THE 22ND INTERNATIONAL CONFERENCE - RADIOELEKTRONIKA 2012 | 2012年
关键词：
Nonuniform sampling; Lomb-Scargle periodogram; cardiac aliasing; respiration; heart rate variability;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Aliasing is a well known phenomenon in spectral analysis of sampled signal and it can be clearly described when the sampling interval remains constant. The situation is more complicated in nonuniform sampling that found its use in some kinds of measurements, such as those in radio-astronomy and biological sciences. In this paper we have derived the formula for power spectral density of nonuniformly randomly sampled sinusoid based on the uniform sampling approximation and Lomb-Scargle periodogram. The obtained results are analyzed with special attention to the aliasing effect. The detectability of a component beyond the Nyquist limit has been proven theoretically and also demonstrated on experimental data: the respiration signal derived from electrocardiogram and the heart rate signal in the condition referred to as cardiac aliasing.
引用
收藏
页码：139 / 142
页数：4
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