中文摘要：

研究了对多用户多输入多输出下行链路进行块对角化后,使用格基规约算法的几何均值分解矢量预编码的实现方法。根据块对角化思想将多用户多天线信道分解为等价并行子信道,基于等价子信道给出了单个用户的几何均值分解矢量预编码的传输方案,通过使用格基规约算法分别结合连续干扰消除和垂直分层空时编码两种方法,求解矢量预编码中的扰动矢量。仿真表明,提出的方法误码率性能优于块对角化矢量预编码算法2 dB以上,而且能在不降低系统性能的前提下降低计算复杂度。

英文摘要：

Based on the block diagonalization（BD） for multiuser Multiple-input Multiple-output（MIMO） downlink channel,a vector precoding（VP） combined with geometric mean decomposition（GMD） based on lattice reduction（LR） algorithm is studied.The multi-user multi-antenna channel is decomposed into parallel effective sub-channels,and then a GMD VP transmission scheme for single user is presented based on the above effective sub-channel.The LR algorithm combined with successive interference cancellation（SIC） and Vertical Bell Laboratories Layered Space-Time（VBLAST） is exploited,so that the perturbation vector is obtained.Simulation results show that the bit error rate（BER） of proposed method outperforms that of block diagonalized vector precoding at least 2dB,and the LR algorithm can reduce the computation complexity with the same system performance.