“…It is also assumed that Z n , I n , θ n , ξ n,k , a n,k , and c n,k are mutually independent of each other. The spectral analysis presented in this paper for correlated unbalanced or balanced data sources is based on the state-transition diagram model, which can be interpreted as a Moore finite-state sequential machine (FSSM) and its corresponding Markov chain (MC) model as outlined in [11,19,20]. In other words, signal generation process can be represented by a Moore-Markov model which can be straightforwardly used for the spectral analysis of systems where the PAM and the PPM data streams, (I n ,θ n ), are correlated.…”