基于非理想信道状态信息的鲁棒矢量预编码设计

Robust Vector Precoding with Imperfect Channel State Information

在多用户多输入多输出(MIMO)系统中,提出一种适用于非理想信道的鲁棒矢量预编码设计方法.使用非理想信道模型,发射端仅获得部分信道状态信息,即已知信道估计值及信道误差值的一阶和二阶统计量,利用已知的信道条件并最小化收发信号的均方误差,推导出鲁棒的矢量预编码矩阵和扰动矢量.仿真表明,该鲁棒预编码方法比传统方法具有更好的性能.

A robust vector precoding scheme is proposed for imperfect channel in multi-user MIMO system.In the non-ideal channel model,the transmit side only knows imperfect channel state information,i.e.the mean value of the channel estimation and the 1^（st） and the 2^（nd） order statistic value of the estimation error.Based on this channel model,the robust VP precoding matrix and perturbation vector are obtained by minimizing the mean square error of the transmitted and received signals.Simulation results show that the new precoding scheme outperforms the conventional scheme.