基于码本的多用户有限反馈预编码方法

Limited feedback precoding for multiuser systems based on codebook

为改善多用户系统中由有限反馈导致的性能缺失,提出了一种基于码本的预处理有限反馈预编码方法。该方法在接收端根据部分子载波信道信息采用最大信干比准则从预置码本中选取码字反馈给发送端,在发送端根据子载波簇的相关性重构各子载波预编码矩阵,对发送信号进行线性变换以达到容量最优,在接收端利用干扰用户信息对接收阵列信号进行预处理消除部分干扰信息,从而补偿由于有限反馈导致的性能缺失。实验结果表明,所提出的方法在保证反馈链路开销与系统误码性能的情况下,有效地改善了系统吞吐量。

To improve the problem of performance loss due to limited feedback in multiuser systems,a novel limited feedback precoding for multiuser mimo systems based on codebook is proposed.Only a part subcarrier channels should be estimated,the maximum SINR criteria is used for selecting optimal codeword from the codebook at the receiving,exploiting the correlation between sub-carrier channels to reconstruct the other precoding matrix,feedback the precoding codeword index to the transmitter,then the array preprccessing is used at the transmitter and receiver to get optimal capacity,and compensating for the performance loss due to the limited feedback.Simulation results show that the proposed method to ensure the cost of the feedback link,the system throughput and BER performance are improved effectively.