基于块对角化的最小均方误差矢量预编码

针对多用户多输入多输出下行链路系统的预编码问题,提出使用块对角化处理获得具有块对角化结构的等价信道矩阵,并基于等价信道推导收发信号的均方误差,通过最小化均方误差分别求解扰动矢量的两个部分,即扩展星座图的扰动矢量和残余干扰矢量,从而获得发射端信号和预编码矩阵.仿真表明,提出方法的误码率性能优于传统的对角化算法、块对角化迫零准则矢量预编码算法、正则块对角化预编码算法及其改进算法.

Minimum Mean Square Error Vector Precoding Based on Block Diagonalization

For the precoding problem of multi-user multiple input multiple output (MIMO) downlink system, an effective channel having a block diagonal structure by use of block diagonalization (BD) method was proposed. Based on this effective channel, the mean square error (MSE) of transceiver signals was minimized, such that the two parts of perturbation vector, i.e. the perturbation vector expanding constellation and residual interference vector, were derived and thus the total transmit signals and precoding matrix were obtained. The simulation results show that the proposed method outperforms the conventional zero forcing (ZF) BD method, the zero forcing BD vector precoding （VP）, as well as the regularized block diagonalization and its improved methods.