基于自能量回收的全双工用户协作NOMA系统性能分析

Performance Analysis of Self-Energy Recycling Based Full Duplex User Cooperative NOMA Systems

自干扰的存在是全双工(Full Duplex,FD)用户协作中继系统中的不利因素,本文研究了基于自能量回收(Self-Energy Recycling,SER)的FD用户协作非正交多址(Non-Orthogonal Multiple Access,NOMA)中继系统,在FD用户中继处考虑了不同的转发协议以及同时的信息和功率传输,并对NOMA弱用户考虑了不同协议下选择合并和最大比合并两种合并方案,分别推导了不同方案组合下系统用户的中断概率,并提供了各用户中断概率的解析表达式.仿真结果表明提出的基于不同转发协议的SER方案与现有的方案相比,其中断性能均有所提升,并验证了蒙特卡洛仿真与推导的解析表达式的一致性.此外给出了不同参数下的性能仿真对比,为实际系统中合适的参数和方案选择提供了理论参考.

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.