卫星网络下行链路基于NOMA的公平功率分配方案  

NOMA-based fair power allocation scheme for downlink of satellite network

作　　者：李晖[1,2] 刘思恒 林志阳 陈新[1] LI Hui;LIU Siheng;LIN Zhiyang;CHEN Xin(School of Information and Communication Engineering,Hainan University,Haikou 570228,China;School of Electronics and Information Engineering,Binjiang College of Nanjing University of Information Science and Technology,Wuxi 214105,China)

机构地区：[1]海南大学信息与通信工程学院,海南海口570228 [2]南京信息工程大学滨江学院电子信息工程学院,江苏无锡214105

出　　处：《现代电子技术》2022年第1期11-16,共6页Modern Electronics Technique

基　　金：国家自然科学基金地区基金项目(61661018);海南省重点研发计划高新技术项目(ZDYF2018012);海南省自然科学基金项目(619MS029);海南省自然科学基金高层次人才项目(2019RC036) 海南省高等学校科学研究项目(Hnky2019-8)。

摘　　要：非正交多址接入(NOMA)技术依靠大幅度提高资源利用率和系统容量的优势逐渐取代正交多址接入(OMA)技术,目前的卫星通信系统仍以正交多址接入技术为主,这将无法在未来满足庞大的用户需求。文中提出将5G的NOMA技术应用于卫星通信中,并提出一种可实现的基于用户公平性的功率分配方式及对其系统性能造成的影响进行分析。将NOMA技术应用于卫星网络模型中,并且对比了两种基于用户公平性的功率分配方案的性能,以用户最低速率作为约束条件,建立取得最优的用户公平性的设计方案。仿真结果显示,卫星通信系统在NOMA下的系统容量相对于在OMA系统下的系统容量提高了约0.8 dB,由于基于用户公平性的功率分配方式,信道较差的用户在性能上提高约1.1 dB。The orthogonal multiple access(OMA) technology is gradually being replaced by the non-orthogonal multiple access(NOMA)technology with advantages of significant increase of resource utilization rate and system capacity. In the current satellite communication system,the OMA technology is still given to priority,which will not be able to meet the demand of large number of users in the future. In this paper, the application of the NOMA technology of 5 G system in satellite communication is put forward,a kind of applicable power allocation method based on user fairness is proposed,and the effects of this method on the system performance are analyzed. The NOMA technology is applied to the satellite-terrestrial network model and the performances of the two power allocation schemes based on user fairness are contrasted. The design scheme with the optimal user fairness is established by taking the user minimum rate as a constraint condition. The simulation results show that the capacity of the satellite communication system based on NOMA technology is 0.8 dB higher than that based on OMA technology,and the performance of the users in the poorer channels is increased by 1.1 dB due to the power allocation method based on user fairness.

关 键 词：功率分配 非正交多址 卫星通信 星-地网络 比例公平调度 分式发射功率分配 用户分组 

分 类 号：TN927.2-34[电子电信—通信与信息系统]