去蜂窝大规模MIMO-NOMA上行链路用户分组及AP选择  

Research on user grouping and AP selection in the uplink of cell-free massive MIMO-NOMA

作　　者：黄燕婷 赵峰[1] HUANG Yanting;ZHAO Feng(School of Information and Communication,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2024年第4期355-364,共10页Journal of Guilin University of Electronic Technology

基　　金：国家自然科学基金(62461057)。

摘　　要：针对去蜂窝大规模MIMO-NOMA系统上行链路的用户分组和AP选择问题,提出了一种最大信道相关性用户分组方案和基于有效信道增益的AP选择方案。首先,最大信道相关性用户分组方案通过统计学和皮尔逊相关系数分别计算出任意2个用户之间的有效信道增益差和信道线性相关性。然后,以任意2个用户差值最小化为目标对用户进行分组。在用户分组结果的基础上,先根据用户信道质量对用户进行排序,再基于有效信道增益为每个用户选择可连接的AP。实验结果表明,基于最大信道相关性的用户分组方案能够降低多用户间的干扰水平,显著提高系统总频谱效率和通信的公平性。同时,基于有效信道增益的AP选择方案能够减少用户间干扰和降低系统计算的复杂度,有效提高了系统总频谱效率。Focusing on the problems of user grouping and AP selection in the uplink of cell-free massive MIMO-NOMA system,a maximum channel correlation user grouping scheme and an AP selection scheme based on effective channel gain are proposed.First-ly,the maximum channel correlation user grouping scheme calculates the effective channel gain difference and channel linear corre-lation between any two users through statistics and the Pearson correlation coefficient.Then,users are grouped to minimize the dif-ference between any two users.Based on the user grouping results,users are first sorted according to user channel quality,and then connectable APs are selected for each user based on effective channel gain.Experimental results show that the user grouping scheme based on maximum channel correlation can reduce the interference level among multiple users and significantly improve the sum spectrum efficiency of the system and the fairness of communication.At the same time,the AP selection scheme based on effective channel gain can reduce interference between users and reduce the complexity of system calculations,effectively improving the sum spectrum efficiency of the system.

关 键 词：去蜂窝 大规模MIMO NOMA 用户分组 AP选择 

分 类 号：TN929.5[电子电信—通信与信息系统]