Resource Allocation in Full Duplex Wireless Powered Communication Networks

In recent years, advances in self interference (SI) cancellation technology engage the operators to implement the full duplex (FD) operation in the wireless networks to double the spectral efficiency. On the other hand, nowadays, Wireless powered communication networks (WPCN) have been increasingly utilized in which radio frequency signals are employed to transmit wireless power. Therefore, in this paper, a small cell WPCN-based FD system is investigated in which the base station sends energy signal to users in the first time interval. Then, in the second interval, by considering a FD system, the base station is able to send/receive the information signal to multiple half duplex (HD) users based on non-orthogonal multiple access (NOMA) on the same frequency resources. The goal is to maximize the energy efficiency of FD system. We have applied an iterative algorithm to solve the non-convex optimization problem. The optimization problem is decomposed into two sub-problems: time and power allocation sub-problems. In each iteration time allocation is updated by using the linear problem, and downlink/uplink power is updated by using the arithmetic-geometric mean approximation (AGMA) algorithm

Keywords:

self-interference cancellation , full duplex , wireless powered communication networks , non-orthogonal multiple access , arithmetic-geometric mean approximation