《计算机应用研究》|Application Research of Computers

下行NOMA系统中一种考虑用户QoS的功率分配方案

Power allocation scheme considering user QoS in downlink NOMA system

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作者 陈发堂,邓青,石贝贝
机构 重庆邮电大学 通信与信息工程学院,重庆 400065
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文章编号 1001-3695(2021)01-054-0269-04
DOI 10.19734/j.issn.1001-3695.2019.10.0630
摘要 为了提高未来网络的系统吞吐量和频谱效率,非正交多址接入技术(non-orthogonal multiple access,NOMA)的功率分配问题成为了近年来移动通信领域研究重点。在保证用户服务质量的前提下,针对下行NOMA系统的功率分配问题进行了研究,在子带间采用迭代注水算法,小范围注水分配各子带的功率,在子带内考虑用户服务质量,利用卡罗需—库恩—塔克(Karush-Kuhn-Tucker, KKT)条件求出最优功率分配因子,以此最大化系统总吞吐量。仿真证明,提出的功率分配方案能达到的系统总吞吐量、频谱效率优于传统的功率分配方案,其系统总吞吐量比正交多址接入技术(orthogonal multiple access,OMA)提升了约40%以上。
关键词 非正交多址; 功率分配; 用户服务质量; 迭代注水; KKT条件
基金项目 国家自然科学基金资助项目(61701063)
本文URL http://www.arocmag.com/article/01-2021-01-054.html
英文标题 Power allocation scheme considering user QoS in downlink NOMA system
作者英文名 Chen Fatang, Deng Qing, Shi Beibei
机构英文名 School of Communication & Information Engineering,Chongqing University of Posts & Telecommunications,Chongqing 400065,China
英文摘要 In order to improve the system throughput and spectrum efficiency of the future network, the power allocation of non-orthogonal multiple access(NOMA) technology has become the research focus in the field of mobile communication in recent years. Under the premise of ensuring the quality of service of users, this paper studied the power allocation problem of the downlink NOMA system. It used the iterative water injection algorithm between sub-bands to distribute the power of each sub-band in a small range. Considering the quality of service of users in the sub-band, it obtained the optimal power allocation factor by using KKT condition, so as to maximize the total throughput of the system. The simulation results show that the total throughput and spectrum efficiency of the proposed power allocation scheme are better than that of the traditional power allocation scheme, and the total throughput of the system is improved by more than 40% compared with the OMA.
英文关键词 NOMA; power allocation; user quality of service; iterative water injection; KKT condition
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收稿日期 2019/10/31
修回日期 2019/12/27
页码 269-272
中图分类号 TN929.5
文献标志码 A