A new method judging the interpolation direction
نویسندگان
چکیده
The discrete Fourier transform (DFT) algorithms are commonly used in frequency estimation. The interpolation direction of the interpolated algorithms based on DFT is always defined by the information of spectral amplitude, such as the Rife algorithm. In the case of low signal to noise ratio (SNR), false decision of the interpolation direction occurs sometimes. However, decreasing false rate of the interpolation direction decision can improve the frequency estimation accuracy directly. In this paper, a new method to judge the interpolation direction based on spectral phase information instead of amplitude is presented, which is helpful to improve the original Rife algorithm or other interpolated algorithms based on DFT. The simulation results demonstrate that the false rate of interpolation direction judged by the proposed method is obviously lower than that by the original Rife algorithm in the case of low SNR, and also show that its achievement of a low variance close to the Cramer-Rao lower bound. Key-Words: Frequency estimation; Rife algorithm; interpolation direction
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