基站协作预编码中的用户及天线联合选择  

Combined Selection of Users and Antennas During Coordinated Precoding of Base Station

作　　者：孙丽楠[1] 张中兆[1] 沙学军[1] 

机构地区：[1]哈尔滨工业大学电子与信息工程学院,黑龙江哈尔滨150080

出　　处：《华南理工大学学报（自然科学版）》2011年第12期25-31,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"973"计划项目(2007CB310601);新一代宽带无线移动通信网科技重大专项(2009ZX03004-001)

摘　　要：基站协作预编码能支持的用户数往往受到天线数的限制,因此需要对用户进行选择.此外,为了进一步减小对其他用户的干扰,还可以对接收天线进行选择.因此,文中以最大化系统和容量为准则,提出两种基站协作系统中的低复杂度次最优用户及天线联合选择算法.一种是基于容量的算法,另一种是基于范数的算法,这两种算法都利用贪婪的思想在进行用户选择的同时对接收天线也进行选择.仿真表明,当系统用户数接近预编码约束条件时,可以只采用天线选择,其性能甚至优于未选择之前的性能;当系统用户数较多时,可以采用联合选择,在获得用户选择带来的多用户分集增益的同时,相对于没有进行天线选择且具有同等数目天线的用户,仍然有额外的性能增益.In the coordinated precoding of base station,the number of supported users is commonly limited by that of antennas,so that a selection of users is required.In addition,for the purpose of further reducing the interference to other users,a selection of antennas can also be performed.Based on the two above-mentioned details,two low-complexity and near-optimal combined selection algorithms of users and antennas in base-station coordinated systems are proposed to maximize the system sum capacity.The two algorithms,respectively based on capacity and norm,both adopt the greedy principle to simultaneously select users and antennas.Simulated results show that,when the number of users in the system approaches the precoding constraints,only the antenna selection can be used,and the system performance is even better than that before the antenna selection;and that,when there exist a great number of users in the system,the combined selection can be used,which may achieve multi-user diversity gain resulting from user selection as well as additional performance gain for the users without antenna selection but with the same antenna number.

关 键 词：协作系统 接收天线 联合选择 用户数 预编码 基站 选择算法 用户选择 

分 类 号：TN925.5[电子电信—通信与信息系统]