利用有向图实现多用户下行多天线系统的用户选择  

Realization of User Selection Algorithm for Downlink Multiuser Multiple Antenna System with Directed Graph

作　　者：郑海波[1] 赵莉[2] 刘雅娟[1] 

机构地区：[1]海军航空工程学院青岛分院,山东青岛266041 [2]海军飞行学院,辽宁葫芦岛125001

出　　处：《电讯技术》2010年第10期1-5,共5页Telecommunication Engineering

摘　　要：在多用户下行多天线系统中,基站可利用信道状态信息将独立的数据流同时发送到多个用户以得到更高的信道容量。由于在实际系统中基站很难实时得到各用户的完全信道状态信息,可以基于有限的信道反馈量进行用户选择来提高系统的和速率。提出了一种部分信道状态信息下利用有向图实现多用户下行多天线系统用户选择的算法。该算法将用户选择的问题变成了在有向图中寻找闭合环的问题,可以大幅度降低用户选择的复杂度;克服了常规的随机波束成形算法只有在用户数非常多的时候才能有效工作的弱点,在用户数少或中等的时候能得到比其更好的性能。因此该算法更适合在实际系统中应用。When channel state information（CSI） is available at the transmitter in downlink multiuser multiple antenna system, the base station can transmit independent data streams to multiple users simultaneously to achieve a much higher channel capacity. Because of the fact that it is difficult for base station to obtain instantaneous CSI exactly in practical system, partial CSI based user selection can increase system sum rate. In this paper a directed graph based user selection algorithm is proposed for downlink muhiuser multiple antenna system when the base station only knows users＇ partial CSI. This algorithm changes the user selection problem into problem of seeking closed loop in directed graph. It yields a considerable user selection complexity reduction and overcomes the draw- back of conventional random beamfonning scheme which only enjoys significant gains with a large number of users. It outperforms conventional random beamfonning scheme when user number is small or moderate. This algorithm is easy to realize in practical systems.

关 键 词：多用户多天线系统 部分信道状态信息 用户选择 有向图 

分 类 号：TN929.5[电子电信—通信与信息系统]