Energy Efficient Joint Power Optimization for Full-Duplex Relaying

Full-duplex (FD) relaying is a promising technology for the next generation communication systems. In this paper, we aim to jointly optimize the source and relay transmit powers to maximize the energy efficiency (EE) for both amplify-and-forward (AF) and decode-and-forward (DF) FD relay systems. The considered problem is challenging, which cannot be directly addressed by the classical Dinkelbach's algorithm. We first develop an iterative algorithm based on concave-convex procedure (CCCP) to find a locally optimal solution. Furthermore, to reduce the computational complexity, we propose an efficient non-iterative method that only needs to solve a single convex problem and meanwhile achieves near-optimal performance. Simulation results show that the proposed solutions can achieve superior EE performance compared to conventional schemes.