On the Ergodic Capacity and Ergodic Secrecy Rate of Rate Splitting Aided Wireless Multiple Access Channel With Correlated Channel Coefficients

Rate-splitting multiple access (RSMA) is a promising technology for future wireless networks. In the present paper, a two-user RSMA-aided multiple access channel (MAC) in the presence and the absence of one eavesdropper with correlated Rayleigh fading coefficients is considered. The correlation between random variables is modeled by the aid of copula theorem. (I) The ergodic capacity of RSMA-aided MAC, (II) the individual ergodic secrecy rate (ESR) of RSMA-aided multiple access wiretap channel (MAC-WT), and (III) the positive secrecy capacity probability (PSCP) are obtained by the aid of Farlie-Gumble-Morgenstren (FGM) copula. The results are extended to NOMA-aided MAC and NOMA-aided MAC-WT. The theoretical results are evaluated by numerical results.