A Power Spectral Density Analysis for Digital FM

Except for rectangular-shaped modulating pulses, the specification of the power spectral density function (psdf) for digital FM is analytically perverse and only a few results are available in the journal literature. In this paper an analysis is presented based on the selection of an appropriate duration-limited/level-quantized approximation for the modulating pulses and equations suitable for machine computation are subsequently developed. Examples of interest are selected from the areas of binary FM, binary correlative FM, and quaternary correlative FM with the results presented in graphical form