Abstract
The problem of calculating accurate power spectral densities for an extended class of digital FM schemes is considered. This extended class includes partial response as well as multilevel schemes. A method suitable for numerical calculation using a computer is developed. This new method consists of two parts. First, the spectral main lobe is calculated. Then, the spectral tail is calculated by a different approach. The accuracy of the spectral tail is that of a correction term to an analytical asymptotic tail formula. This method yields accurate power spectra down to a level considerably below -100 dB. Numerical results obtained from calculations are given. The power spectra can be calculated for an arbitrary modulation index value.
Published Version
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