空间相关MIMO广播信道中的预编码技术  

Precoding Technique for Spatially Correlated MIMO Broadcast Channels

作　　者：赵金旺[1] 徐友云[1] 蔡跃明 

机构地区：[1]解放军理工大学通信工程学院,南京210007

出　　处：《系统仿真学报》2009年第17期5549-5552,共4页Journal of System Simulation

基　　金：江苏省自然科学基金(BK2006701;BK2006702);国家自然科学基金(60672079)

摘　　要：针对多天线多用户下行链路中,采用块对角化预编码进行多路并行传输时,用户端的检测复杂度比较高,且系统的和速率性能将受到信道空间相关性严重影响的问题,提出了一种将发送端迫零预编码与接收端天线选择进行联合的预编码方案,降低了接收复杂度。分析了该方案在最佳信道选择下的性能,并引入了一种简单的次优天线选择算法。仿真表明,提出的预编码方案在和速率性能上明显优于原迫零预编码,且在高信噪比情况下,几乎获得了与块对角化预编码相同的和速率。In multi-antenna multi-user downlink, the detection complexity at the user side is very high when block diagonalization precoding is employed for multiplexing. And the sum rate performance of the system will degrade dramatically due to the correlation between channels. A new precoding scheme combining zero-forcing precoding at the transmitter and antenna selection at the receiver was proposed to reduce the complexity of receiver The performance of the scheme employing optimal selection was analyzed and a sub-optimal selection algorithm was introduced for simplicity. Simulation results show that the proposed precoding scheme obviously outperforms traditional zero-forcing precoding in terms of sum rate. And it achieves almost the same performance as block diagonalization precoding at high signal-to-noise rate （SNR）.

关 键 词：多输入多输出 广播信道 预编码 天线选择 

分 类 号：TN929.5[电子电信—通信与信息系统]