一种基于信道外推的预编码方法

为了解决多天线(multiple input multiple output， MIMO)系统中因反馈延时带来的预编码码字和信道之间不匹配问题，提出了一种基于信道预测的预编码方法。该方法通过当前时刻和之前两个时刻的信道，利用外推方法，预测未来时刻的信道，使用预测信道，选择预编码码字并反馈到发送端,以补偿反馈延时的影响。仿真结果表明，该方法有效地减小了反馈延时带来的性能损失。

Precoding method based on channel extrapolation

To solve the mismatch between precoding matrix and the channel, which is caused by the feedback delay, a precoding method based on channel prediction is proposed. In this method, by exploiting the channel information of the current and the last two successive slots, the channel matrix of the future can be extrapolated. According to the forecasting channel information, a precoding matrix is selected and sent to the transmitter to counteract the influence of feedback delay. The simulation results show that the proposed method can significantly mitigate the performance degradation due to the feedback delay.