一种基于部分信道状态信息的稳健性预编码方案  

Robust precoding scheme with partial channel side information

作　　者：张倩[1] 王晶晶[1] 

机构地区：[1]重庆邮电大学个人通信研究所移动通信信息产业部重点实验室,重庆400065

出　　处：《电子测试》2008年第8期22-24,共3页Electronic Test

摘　　要：目前的传输预处理算法都是假设发送端有理想的信道信息。然而,在实际系统中发射端只有来自接收端的部分信道信息。本文首先分析了部分信道状态信息产生的原因。然后提出了一种等效噪声方法,当发射端已知部分信道状态信息时对预编码设计的稳健性进行初步研究。本文的等效方法,即将反馈误差建模为接收端的等效噪声,利用ZF准则对反馈误差、用户间干扰进行统一处理。最后在TD-SCDMA系统应用环境里对该方法进行了仿真分析,结果表明反馈误差对预编码影响较大,采用等效噪声后的预编码相比没有考虑反馈误差的预编码性能很明显提高。The present Rx oriented transmission algorithms mostly suppose the receiver has perfect channel state information （CSI）. However, the transmitter has only partial channel state information feedback from the receiver in realistic system. First, this paper summarizes the reason of the partial channel state information. And then, it introduces a method of equivalent noise to study the robust solution of the design of precoding with partial CSI. In this paper, based on ZF criterion, the method modeling feedback error to equivalent noise, and then deals with feedback error and interference together. Finally this method is simulated and analyzed on TD--SCDMA system, and the simulation results are used to show that the precoding system suffers greatly from performance degradation with feedback error and the performance advan- tage is attained by the robust optimization.

关 键 词：信道状态信息(csI) 预编码 反馈 等效噪声 

分 类 号：TN919.72[电子电信—通信与信息系统]