Comparative Study of Two Digital Phase Delay Estimators with Negative Frequency Contribution

摘要：

A comparison is drawn between two digital phase delay estimators with negative frequency contribution which are suitable for real signals when the frequency is quite low or close to the Nyquist frequency. The first estimator is based on discrete Fourier transform and the second estimator is based on discrete-time Fourier transform. Using the error theory,the formulas for evaluating the mean square errors of phase delay estimate under noisy conditions by the two estimators are deduced and compared with the Cramer-Rao lower bound. Theoretical analyses and simulation results show that the second estimator is superior to the first one for the case of large spectrum leakage error and can attain optimum performance.

关键词： phase delay estimation negative frequency discrete Fourier transform discrete-time Fourier transform performance analysis.

作者: Haitao Zhang Yaqing Tu Fenhua Su Liangbing Liu

作者单位: Department of Information Engineering,Logistical Engineering University No.174,Changjiang 2nd Road,Chongqing 400016,China

会议类型: 国际会议

会议名称: 2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)

会议地点: 北京

会议语种:英文

页码: 1927-1930

在线出版日期: 2009-08-16（万方平台首次上网日期，不代表论文的发表时间）