多用户认知非正交多址接入系统中断性能分析及功率分配算法  

Outage Performance Analysis and Power Allocation Algorithm of Multi-user Cognitive Radio Non-Orthogonal Multiple Access System

作　　者：申滨[1] 张楠[1] 蒋慧林 董坤明 SHEN Bin;ZHANG Nan;JIANG Huilin;DONG Kunming(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《电子与信息学报》2023年第4期1201-1210,共10页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(62071078)。

摘　　要：非正交多址接入(NOMA)是5G网络关键候选技术之一,其与认知无线电(CR)技术相结合形成系统(CRNOMA),能够实现更高的频谱效率及更大的吞吐量。该文将直传与中继协同传输(CDRT)方案引入多用户CRNOMA系统,其中CDRT表示次级源(SS)直接与近端次级用户通信,而仅通过中继(R)与多个远端次级用户通信。在非理想自干扰消除和全双工(FD)中继情况下,推导了每个NOMA用户中断概率(OP)的精确闭式表达。此外,在该系统模型下分析SS, R和用户的收益最优化问题,提出一种基于收益的两阶段迭代功率分配算法。仿真结果显示,在高信噪比(30 dB)条件下,与随机功率分配及平均功率分配方案相比,该文所提算法的用户和速率、SS总收益、R总收益分别可最高提升13%, 56%及26%。蒙特卡罗仿真验证了理论分析与实验结果的一致性。Non-Orthogonal Multiple Access(NOMA)is one of the key candidate technologies for 5G networks.Combined with Cognitive Radio(CR)technology,the CR-NOMA system achieves higher spectral efficiency and greater throughput quantity.The Coordinated Direct and Relay Transmission(CDRT)technology is introduced into the CR-NOMA system in this paper,where one Secondary Source(SS)communicates directly with one near-end secondary user,and the SS can only communicate with multiple far-end secondary users with the help of one Relay(R)node.With imperfect self-interference cancellation and Full-Duplex(FD)relaying,closed-form expressions for the Outage Probability(OP)of the NOMA users are derived.In addition,the revenue optimization problem of SS,R,and the users is analyzed,and an iterative algorithm of two-step user power allocation is proposed.Simulation results show,under the condition of a high signal-to-noise ratio(30 dB),compared with the average power allocation scheme and the random power allocation scheme,the proposed algorithm increases the user sum rate by up to 13%,the SS total income by 56%,and the R total income by 26%.Monte Carlo simulations verify that the theoretical analysis well matches the experimental results.

关 键 词：非正交多址接入 认知无线电 中断概率 功率分配 

分 类 号：TN929.5[电子电信—通信与信息系统]