Calculating Digital FM Spectra by Means of Autocorrelation

In sharp contrast to the task of calculating the power spectrum for a general digital FM scheme, the autocorrelation can easily be obtained. By considering a class of FM schemes having a time-limited autocorrelation function, truncation is avoided and, applying a Fourier transformation, power spectral densities are easily obtained. A method is applied taking these properties into account. Thus, a powerful tool is available for investigation of different parameters within the considered digital FM modulation format.