High-accuracy Frequency Estimation of Sinusoid based on DFT and DTFT

This paper presents a high-accuracy frequency estimation algorithm of sinusoid based on three spectral lines interpolation of Discrete Fourier Transform (DFT) and Discrete-Time Fourier Transform (DTFT). Two DTFT spectral lines located on the same side of the maximum DFT spectral line and the maximum DFT spectral line are used to accurately estimate the signal frequency. Simulation results show that the Root Mean Square Error (RMSE) of the presented algorithm is lower than that of the existing algorithms. In a wide range of signal-to-noise ratio (SNR), the presented algorithm is closer to the Cramer-Rao Lower Bound (CRLB) than the existing algorithms.