摘要
近年来,非正交多址接入(NOMA)技术作为5G的候选技术之一受到了广泛关注。文中研究以系统容量最大化为目标的NOMA系统上行链路资源分配问题。由于原问题的复杂性,将原优化问题分解为用户配对和功率分配两个子问题。首先研究了两种基于信道增益的用户配对方案,即传统的远近配对方案与均匀信道增益差异(UCGD)配对方案。此外,综合以上两种方案的优势,还研究了两种混合配对方案以降低用户间的干扰。进一步地,在NOMA用户组的总发送功率、用户最大发送功率、用户最小传输速率约束下,研究上行链路的总吞吐量最大化问题,并利用Karush-Kuhn-Tucker(KKT)条件导出NOMA组内最优功率分配方案的闭式解。仿真结果表明,采用文中提出的用户配对和功率分配方案的NOMA系统容量远超OMA系统。
In recent years,non-orthogonal multiple access(NOMA) technology has received considerable attention as one of the candidate technologies for 5 G.The resource allocation problem for the uplink NOMA system with the goal of maximizing system capacity is studied.Due to the complexity of the original problem,the original optimization problem is decomposed into two sub-problems of user pairing and power allocation.Two user pairing schemes based on channel gain,the conventional far-near pairing scheme and the uniform channel gain difference(UCGD) pairing scheme are studied.In addition,two hybrid pairing schemes are also studied to reduce interference between users by combining the advantages of the above two schemes.Furthermore,we formulate a sum-throughput maximization problem for uplink under the constraints of the minimum rate requirements of the users,the maximum transmission power of the user and the total transmission power within a NOMA group.The closed-form solution of the optimal power allocation within a NOMA group is derived using the Karush-Kuhn-Tucker(KKT) conditions.Simulation results show that the capacity of the NOMA system with our proposed user pairing and power allocation scheme is much better than that of the OMA system.
作者
黄琪
宋荣方
HUANG Qi;SONG Rongfang(College of Telecommunications & Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;Jiangsu Engineering Research Center of Communication and Network Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)
出处
《南京邮电大学学报（自然科学版）》
北大核心
2019年第3期45-50,共6页
Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition
基金
江苏省自然科学基金(BK20181392)
南京邮电大学江苏省通信与网络技术工程研究中心开放课题资助项目
关键词
非正交多址
上行
用户配对
功率分配
non-orthogonal multiple access
uplink
user pairing
power allocation
