关键词: 多用户多输入多输出系统, 发射端信道状态信息, 信道估计, 线性预编码

Abstract:

To eliminate effects of the feedback delay and mobile velocity in broadcast channel, the channel statistics and outdated channel information is used to estimate the current channel state information at transmitter (CSIT) jointly. Based on the obtained imperfect CSIT, a robust linear zero forcing (ZF) precoding is proposed. Simulation shows the performance of robust method is preferable. Furthermore, the relationship between system performance and feedback delay or mobile speed is presented.

Key words: multi-user multi input multi output system, channel state information at transmitter, channel estimation, linear precoding