Accurate Amplitude Estimation of Harmonic Components of Incoherently Sampled Signals in the Frequency Domain

Daniel Belega (1) , Dominique Dallet (2) , David Slepicka (3)

1 UPT - Universității Politehnica Timișoara [România] = Polytechnic University of Timişoara [Romania] = Université polytechnique de Timișoara [Roumanie]
2 IMS - Laboratoire de l'intégration, du matériau au système
3 CTU Pragua - Department of Measurement

This paper focuses on estimating the amplitude of harmonic components of a harmonically distorted sine wave by the interpolated discrete Fourier transform (IpDFT) method with maximum sidelobe decay windows. The expression of the maximum of the interference error caused by the fundamental sine-wave component on the amplitude estimation of harmonic components is derived. In addition, for a signal corrupted by stationary white noise, the statistical efficiency of the IpDFT method is investigated with respect to the single-tone unbiased Cramer-Rao lower bound (CRLB). Based on the derived expressions, a constraint is derived ensuring that interference from the fundamental component could practically be neglected. Finally, the performance of the IpDFT method is compared with that of the energy-based method on the basis of theoretical, simulation, and experimental results and with that of a state-of-the-art method according to simulation and experimental results.

Domaines: Micro et nanotechnologies/Microélectronique

Daniel Belega, Dominique Dallet, David Slepicka. Accurate Amplitude Estimation of Harmonic Components of Incoherently Sampled Signals in the Frequency Domain. IEEE Transactions on Instrumentation and Measurement, 2010, 5 (9), pp.1158 -1166. ⟨hal-00479687⟩