We present a study of nonstationary multiple-scattering noise resulting from pulse reflection from a one-dimensional randomly layered half-space. It is shown that the noise power spectrum exhibits model-independent universal behavior when it is analyzed in terms of a single dimension-less variable $x$, defined as the ratio between the mean distance traveled by the pulse and the frequency-dependent localization length. Results of numerical simulation indicate that the spectrum is a peaked function of $x$, where the height of the peak defines the expected value of a noise upper bound.

• Received 16 May 1986

DOI:https://doi.org/10.1103/PhysRevLett.57.1000