Wireless Energy Harvesting and Self-Energy Recycling in a Full-Duplex MIMO Relay Network with Interference Alignment

We investigate the performance of utilizing a full-duplex (FD) wireless powered relay to facilitate transmission between base-station (BS) and a distant user in a small cell. Relay employs the power splitting (PS) method to harvest its necessary power from the interference and residual self-interference (RSI) signals. Aiming at maximizing the transmission rate of the distant user, we derive a closed-form solution for relay optimal PS ratio. Moreover, we apply the interference alignment (IA) technique with the Max-SINR approach to jointly eliminate the interferences, including the RSI signal at relay's information processing unit, and maximize the transmission rate. At last, simulations illustrate the rate gain of the proposed scheme over the benchmark schemes.