Performance Enhancement in Full-Duplex AF Relay System through Smart Antenna Allocation

Energy efficiency (EE) and spectral efficiency (SE) are two crucial performance metrics for next-generation wireless standards. In this work, the SE and EE of a full-duplex (FD) relay system based on the amplify-and-forward (AF) scheme is investigated. Specifically, it has been shown that residual self-interference (RSI) due to imperfect self-interference cancellation (SIC) impacts the SE and EE of the FD relay system. A smart antenna allocation (AA) scheme has been proposed that enhances the SE and the EE of the FD relay system through optimally allocating the antennas at the FD relay. Further, the impact of relay location has also been studied and it has been shown that the SE and EE of the FD relay systems can be maximized through optimal AA scheme and relay location. The proposed analysis is corroborated through simulations, which are in good conformity with the analytical results.