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Estimation of the Amplitude Square Using the Interpolated Discrete Fourier Transform To improve the estimation of active power, the possibility of estimating the amplitude square of a signal component using the interpolation of the squared amplitude discrete Fourier transform (DFT) coefficients is presented. As with an energy-based approach, the amplitude square can be estimated with the squared amplitude DFT coefficients around the component peak and a suitable interpolation algorithm. The usedoi:10.2478/v10178-011-0056-6 fatcat:oougdpqpofdvrnztwno2jil4y4