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<p>by  to the signal as follows:</p>

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:</p>

<p>Different phase noise processes, , possess different power <a href="page.php?w=Spectral_density">Spectral density</a> (PSD). For example, a white noise PSD follows a  trend, a pink noise PSD follows a  trend, and a brown noise PSD follows a  trend.</p>

<p> is the single-sided (f>0) <b>phase noise PSD</b> , given by the <a href="page.php?w=Fourier_transform">Fourier transform</a> of the <a href="page.php?w=Autocorrelation">Autocorrelation</a> of the phase noise, as stated in the <a href="page.php?w=Wiener-Khinchin_theorem">Wiener-Khinchin theorem</a>.</p><p>
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