Energy Efficiency Comparison for Full-Duplex DF and AF Relaying Protocols

In this paper, the energy efficiency (EE) of full-duplex (FD) two-hop relay system with decode-and-forward (DF) and amplify-and-forward (AF) relaying protocols is studied. The residual self-interference (RSI) is modeled as a linear function of relay transmit power first. Then, with the constant transmission rate, the EE maximization problem is transformed into transmit power minimization problem and the minimum transmit power consumptions of the DF and AF protocols are obtained. Furthermore, the EE comparison of the DF and AF protocols is given with the minimum transmit power consumption. The simulation results are given to verify the theoretical EE analysis and comparison.