MIMO系统中基于非正交多址接入的功率分配算法研究  

Study on Power Allocation Algorithm Based on Non-Orthogonal Multiple Access in MIMO Systems

作　　者：李云[1] 蔡丽娟 苏开荣[1] LI Yun;CAI Li-Juan;SU Kai-Rong(College of Communication and Information Engineering,Chongqing University of Post and Telecommunications,Chongqing 400065)

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：《计算机学报》2021年第5期1013-1023,共11页Chinese Journal of Computers

基　　金：国家自然科学基金(61671096);重庆市“科技创新领军人才支持计划”(CSTCCXLJRC201710);重庆市基础科学与前沿技术研究项目(cstc2017jcyjBX0005)资助.

摘　　要：随着移动通信技术的发展,通信服务已变成人类日常生活中不可或缺的部分.尤其是近年来各类智能终端的大众化,使得接入无线通信的用户数和人们对通信服务的需求均呈爆炸式的增长.但现如今可用的频谱资源是有限的,且传统的正交多址接入系统的用户接入数受限,很难满足用户日益增长的需求.非正交多址接入允许在同一时频资源上复用多个用户,极大程度地提高了系统的用户接入数和频谱效率.将非正交多址接入技术运用于多输入多输出系统中,更进一步地提升系统各方面的性能.针对在MIMO-NOMA系统中现有的研究存在的复杂度较高的问题,提出一种基于串行干扰消除残留的功率分配算法.首先,建立斯坦克尔伯格博弈模型,将基站设置为卖方,小区内各用户设置为买方.其次,使用拉格朗日函数求出在约束条件下用户购买的最优功率,此功率为关于单位价格的函数.最后,求解出基站为各用户设置的最优单位功率价格.在基站和用户双方博弈的过程中,基站动态地调整功率价格,尽量最大化自身收益.仿真结果表明,所提算法与分数阶功率分配算法相比,吞吐量在系统总功率为24 dBm且串行干扰消除因子为0.001时有15.65%的提升,并且在吞吐量性能与文献[10]相近的基础上,降低了运算复杂度,减小了基站的功率消耗.With the development of mobile communication technology,communication services have become an indispensable part of human’s daily life.As one of the basic technologies of wireless communication,multiple access technology is a necessary means to satisfy the simultaneous communication of multiple users in wireless network,and each generation of mobile communication has a specific multiple access technology.For example,the iconic multiple access technology in the first generation of mobile communications is frequency division multiple access technology,while it is orthogonal frequency division multiple access in fourth generation mobile communication.In recent years,the popularity of various types of intelligent terminals,such as smart phones,laptops,smart glasses and smart watches,has led to an explosive growth in the number of users allowed to access wireless communications,and people’s demand for communication services has also increased dramatically.However,the available spectrum is limited,and only one user are allowed in each subchannel in traditional orthogonal multiple access systems,such as orthogonal frequency division multiplexing systems,which limits the number of users allowed to access.Therefore,it is difficult for orthogonal multiple access systems to meet the increasing needs of users.Non-orthogonal multiple access allows multiple users to be multiplexed on the same time or frequency resource.Compared with orthogonal frequency division multiple access systems,the number of users allowed by the system and the spectral efficiency is greatly improved.The application of non-orthogonal multiple-access technology to a multiple-input multiple-output system further can improve the performance of some aspects of the system.Aiming at the problem of high complexity of power allocation algorithms in the existing researches in multiple-input multiple-output non-orthogonal multiple-access systems,considering the imperfect serial interference cancellation,a low complexity power allocation algorithm based on Sta

关 键 词：非正交多址接入 多输入多输出 斯坦克尔伯格博弈 功率分配 串行干扰消除 

分 类 号：TN929[电子电信—通信与信息系统]