Representation of a CPM Modulator through a Finite-State Sequential Machine

The well known decomposition of a CPM signal into PAM waveforms represents the linear part of a CPM modulator. The paper deals with the non-linear part, not fully developed in the literature. It is shown that this part can be represented by a finite-state synchronous sequential machine (SM). In such a way the CPM modulator can be implemented by a SM followed by bank of interpolating filters. Three different architectures are obtained using three PAM decompositions. This architecture can also be used to represent multi-h CPM. Finally, examples of application are developed.