The noise levels given by spectral analysis are relevant parameters for the characterization of the time-domain stability of oscillators. The estimation of the noise levels of a sampled signal may be achieved with variances even if the sampling frequency is far lower than the high cut-off frequency. The effects of spectral aliasing for the white-phase noise are shown and a procedure for estimating both white-phase noise level and high cut-off frequency is given in this paper.
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Vernotte et al. (1998) studied this question.
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