Wigner-Ville distribution and cross Wigner-Ville distribution of noisy signals

被引：0

作者：

Chen Guanghua ^{[1
]}

Ma Shiwei ^{[1
]}

Liu Ming ^{[1
]}

Zhu Jingming ^{[1
]}

Zeng Weimin ^{[1
]}

机构：

[1] Shanghai Univ, Ctr Res & Dev, Minist Educ & Microelect, Key Lab Adv Display & Syst Applicat, Shanghai 200072, Peoples R China

来源：

JOURNAL OF SYSTEMS ENGINEERING AND ELECTRONICS | 2008年 / 19卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Wigner-Ville distribution; cross Wigner-Ville distribution; instantaneous frequency; expectation; variance;

D O I：

暂无

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

The Wigner-Ville distribution (WVD) and the cross Wigner-Ville distribution (XWVD) have been shown to be efficient in the estimation of instantaneous frequency (IF). But the statistical result of the IF estimation from XWVD peak is much better than using WVD peak. The reason is given from a statistical point of view. Theoretical studies show that XWVD of the analyzed signal can be estimated from XWVD of the noise-contaminated signal. The estimation is unbiased, and the variance is equal to that of noise. In this case, WVD cannot. be estimated from WVD of the noise-contaminated signal. Therefore, higher SNR is required when WVD is used to analyze signals.

引用

页码：1053 / 1057

页数：5

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