大规模MIMO系统中基于用户位置和用户分类的导频分配  

Pilot allocation based on users’ location and user classification in massive MIMO system

作　　者：曹海燕[1] 马子昌 杨晓慧 胡文娟 许方敏[1] 方昕[1] CAO Haiyan;MA Zichang;YANG Xiaohui;HU Wenjuan;XU Fangmin;FANG Xin(Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学

出　　处：《电信科学》2019年第10期92-99,共8页Telecommunications Science

基　　金：国家自然科学基金资助项目(No.61501158)~~

摘　　要：针对大规模MIMO通信系统中存在的导频污染问题,提出了一种基于用户位置和用户分类的导频分配方案。该方案根据路径损耗和到达角设计目标函数及合理阈值,通过将用户的目标函数与阈值进行比较,把系统中所有用户分为高干扰和低干扰两类,接着为低干扰用户复用导频序列、高干扰用户分配额外正交导频序列来减轻导频污染。仿真结果表明,该方案提高了通信系统性能。Aiming at the problem of pilot contamination in massive MIMO systems,a pilot allocation scheme based on users’location and user classification was proposed.The scheme designed the objective function and reasonable threshold based on path loss and angle of arrival.By comparing the user’s objective function with the threshold,all users in the system were divided into two types:high interference and low interference,and the low-interference users multiplex pilot sequences and extra orthogonal pilot sequences were assigned to high interference users to mitigate pilot contamination.Simulation results show that the scheme improves the performance of the communication system.

关 键 词：大规模MIMO 导频污染 导频分配 归一化均方误差 信干噪比 可达和速率 

分 类 号：TN929.5[电子电信—通信与信息系统]