Performance of in-band full-duplex Amplify-and-Forward and Decode-and-Forward relays with spatial diversity for next-generation wireless broadband

Advanced relaying technologies are part of the next-generation wireless broadband network architecture. In this paper, we derive the average capacity expressions of in-band full-duplex relays operating in the Amplify-and-Forward (AF) and the Decode-and-Forward (DF) modes in the present of spatial diversity. The capacity of the in-band full-duplex AF and DF relays is compared with the half-duplex AF and DF relays. Our numerical results indicate that the capacity obtained by full-duplex relays in AF and DF is superior to half-duplex AF and DF relays. It is interesting to observe that full-duplex relays in AF and DF deliver approximately equal performance. The performance of full-duplex and half-duplex DF relay is more sensitive to the relay link than full-duplex and half-duplex AF.