多小区块对角化的MMSE矢量扰动预编码

针对多小区基站协作的多输入多输出（MIMO）系统中，小区之间和用户之间的干扰对系统造成的性能降低的问题，提出了基于块对角化的最小均方误差（MMSE）矢量扰动预编码方案，实现多小区系统的性能改善。首先使用块对角化方法消除多小区间干扰；在预编码设计环节上，通过MMSE准则设计预编码矩阵，从而抑制病态信道对系统性能的影响；最后使用格基规约方法求解发射端矢量扰动信号。仿真表明，提出的算法提高了多小区矢量预编码的误码率性能，使其优于已有的块对角化及矢量扰动预编码等算法的误码率。

Multi-cell block diagonalization MMSE vector perturbation precoding

In multiple-input multiple-output(MIMO) system with multiple cells cooperation, system performance is degraded due to interference among cells and users.In order to solve the problem,a scheme of minimum mean square error(MMSE) vector perturbation precoding based on block diagonalization is proposed to improve the performance in multiple cells system.The block diagonalization method is used to eliminate interference among zones.In designing precoding matrix the MMSE criterion is adopted to suppress the effect of pathological channel on system performance.Finally, method of lattice reduction is used to get perturbed vector so as to get disturbed signal at transmitting terminal.Simulation shows that the proposed algorithm improves the bit error rate(BER) performance of the multi-cell vector precoding.It is superior to the existing algorithms such as block diagonalization precoding and vector perturbation precoding.