A simple derivation of the power spectrum of full-response CPM and some of its properties
E. Biglieri, Monica Visintin · IEEE Transactions on Communications · 1990
Using a new representation for continuous-phase modulated (CPM) signals, it is shown how a closed-form expression for the power spectral density of full-response M-ary CPM with modulation index J/M can be obtained by straightforward computations. This result is used to provide an explanation of the fact that this power spectral density depends only on J and not on M.>