下行协作NOMA系统中断概率分析与优化  

Outage Probability Analysis and Optimization in Downlink Cooperative NOMA System

作　　者：刘承鹏 张蔺 陈智[1] 李少谦[1] LIU Chengpeng;ZHANG Lin;CHEN Zhi;LI Shaoqian(National Key Lab of Science and Technology on Communications,University of Electronic Science and Technology of China Chengdu 611731)

机构地区：[1]电子科技大学通信抗干扰国家级重点实验室,成都611731

出　　处：《电子科技大学学报》2022年第5期675-680,共6页Journal of University of Electronic Science and Technology of China

基　　金：四川省重点专项(2022YFG0024)。

摘　　要：研究了一个下行协作无线数据传输系统,其中基站采用非正交多址接入(NOMA)技术在一个频段上同时为一个近用户和一个远用户提供无线数据传输服务。由于严重的物理阻挡和阴影效应,基站与远用户之间没有直接通信链路。为了实现基站向远用户的无线数据传输,近用户采用无线携能通信技术,为远用户充当协作中继。与现有的大多数研究不同,考虑了实际场景中能量采集电路的非线性特点,采用一个非线性能量采集模型并分析整个系统的中断性能。具体地,首先推导了上述系统的中断概率的积分形式,为了刻画系统相关参数设计对中断性能的影响,进一步采用近似技术获得系统中断概率闭式解并分析了系统参数的最优设计。最后,仿真结果验证了理论分析与优化设计的正确性。A downlink non-orthogonal multiple access(NOMA)system is studied,in which a base station serves a near user and a far user on the same frequency band simultaneously.Due to physical obstacles or heavy shadowing,there is no direct link from the base station to the far user and the near user acts as a cooperative relay for the far user by adopting the simultaneous wireless information and power transfer(SWIPT)technique.Unlike most existing works,a non-linear model for energy harvesting is adopted to study the system outage performance by considering the non-linear features of the energy harvesting circuits.Specifically,the system outage probability with integral expressions is derived.To characterize the impact of system parameter design on outage probability,the approximated closed-form expression of outage probability can be obtained by further applying the approximation technique,and the optimal design of system parameters is analyzed.Simulation results validate the correctness of the theoretical analysis and the optimal design.

关 键 词：协作中继 NOMA 非线性 中断概率 无线携能通信 

分 类 号：TN92[电子电信—通信与信息系统]