基于自能量回收的全双工用户协作NOMA系统性能分析

The existence of self-interference signal is an unfavorable factor in full duplex(FD) user cooperative relaying system. This paper investigates the FD user cooperative non-orthogonal multiple access(NOMA) relay system based on self-energy recycling(SER), where different forwarding protocols and simultaneous wireless information and power transfer are taken into consideration for FD user relay, and both selection combining and maximum ratio combining schemes are incorporated for the NOMA weak user. We derive the outage probabilities of system users under several combinations consisting of different protocols and schemes, and also provide the analytical expressions of outage probabilities for respective users. Simulation results show that the outage performance of the proposed SER scheme based on different forwarding protocols is improved compared with the existing schemes, and the consistencies between Monte Carlo simulations and the derived analytical expressions are verified. Additionally, we present the performance comparison under different parameters by intensive simulations, which provides a theoretical reference for the selection in terms of proper parameters and schemes in practical systems.