协作非正交多址接入系统的性能分析

Performance analysis of cooperative non-orthogonal multiple access system

为了研究协作非正交多址接入(non-orthogonal multiple access, NOMA)系统的性能,分析了协作NOMA系统的信息速率,构建了协作NOMA系统的能量效率函数.降低协作NOMA系统的复杂度以及移动用户之间的干扰,给出了基于信道状态排序的用户组队方案.仿真分析了发射功率和移动用户数对协作NOMA系统信息速率以及能量效率的影响,结果表明协作NOMA系统的性能优于传统的正交多址接入(orthogonal multiple access, OMA)系统.

To investigate the performance of cooperative non-orthogonal multiple access(NOMA) system, this paper first analyzes the information rate of cooperative NOMA system. And then, the energy efficiency function of cooperative NOMA system is formulated. To reduce the cooperative NOMA system complexity and the interference among mobile users, the user pairing scheme is given, which is based on the order of users’ channel conditions. Finally, the effect of transmit power and mobile user number on the information rate and energy efficiency is studied;and simulation results show that the cooperative NOMA system is superior to the traditional orthogonal multiple access(OMA) system.