systems and methods for determining the spectral arrangement of a composite signal that includes a plurality of individual signals , so that one or more individual signals may be separated from the composite signal . according to one embodiment , a first set of samples are taken from the composite signal during a first time duration , and a second set of samples are taken from the composite signal during a second time duration . the first and second time durations are selected such that at least a portion of the second time duration does not temporally overlap the first time duration . a weighing function is applied to the first and second sets of samples to generate weighted sample sets . the autocorrelation between the first and second weighted sample sets is measured , thereby providing information about the bandwidth occupancies of each of a plurality of individual signals within the bandwidth of the composite signal .