| WVD和XWVD的统计特征分析 |
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| 引用本文： | 陈光化,曹家麟.WVD和XWVD的统计特征分析[J].上海大学学报(英文版),2003,7(4):379-383. |
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| 作者姓名： | 陈光化 曹家麟 |
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| 作者单位： | School of Electromechanical Engineering and Automation，Shanghai University，Shanghai 200072，China，School of Electromechanical Engineering and Automation，Shanghai University，Shanghai 200072，China |
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| 摘 要： | 1 Introduction TheWigner Villedistribution (WVD) 1 7] hasbeenshowntobeefficientintheestimationofinstanta neousfrequency (IF)ofasignal.BecauseWVDisofbettertime frequencyresolutionandabletolocateen ergybasedontheIFlaw ,especiallyforalinearfre quencymodulated(LFM )signalwithaconstantampli tude,WVDwillreducetoarowofdeltafunctions .ThereforeonecanobtainanunbiasedestimateofIFofthesignalusingthepeakofWVD .Butperformanceofthepeakestimatorisdegradedsignificantlywithesti mationvariance quic…
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| 关 键 词： | Wigner-Ville分布 交叉Wigner-Ville分布 WVD XWVD 噪声污染 瞬时频率 |
| 收稿时间： | 17 January 2003 |
Statistical performance of the wigner-ville distribution and the cross Wigner-Ville distribution |
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| Chen?Guang-Hua,Cao?Jia-Lin.Statistical performance of the wigner-ville distribution and the cross Wigner-Ville distribution[J].Journal of Shanghai University(English Edition),2003,7(4):379-383. |
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| Authors: | Chen Guang-Hua Cao Jia-Lin |
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| Institution: | School of Electromechanical Engineering and Automation, Shanghai University, Shanghai 200072, China |
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| Abstract: | This paper analyzes statistical performances of the Wigner-Ville distribution (WVD) and the cross Wigner-Ville distribution (XWVD). 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 using WVD. |
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| Keywords: | Wigner-Ville distribution cross Wigner-Ville distribution instantaneous frequency variance |
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