X-duplex relay with self-interference signal energy harvesting and its hybrid mode selection method

There is the problem of residual self-interference in current research of X-duplex relay reports. In the paper a new X-duplex relay model with self-interference signal energy harvesting is proposed to aim at “turn the harm (residual self-interference) into a benefit (energy harvesting)”. Based on the new model, we give the hybrid mode selection method and the energy harvesting scheme of the X-duplex relay. The signal to interference plus noise ratio (SINR) and the average sum rate of the system are also derive. Furthermore, the linear programming tool is used to solve the optimal solution of hybrid mode selection under unequal duration mode, and the influence of energy conversion efficiency on the optimal solution is analyzed in this paper. In addition, we investigate the influence of the transmit power of the source node and energy conversion efficiency on the performance of the X-duplex system. Finally, the simulation results verified our theoretical derivation, and also significantly improve the power efficiency of the system.