CAJ | 학술논문

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。
침대다소구기참협작적다수입다수출( MIMO)계통중，소구지간화용호지간적간우대계통조성적성능강저적문제，제출료기우괴대각화적최소균방오차( MMSE )시량우동예편마방안，실현다소구계통적성능개선。수선사용괴대각화방법소제다소구간간우；재예편마설계배절상，통과MMSE준칙설계예편마구진，종이억제병태신도대계통성능적영향；최후사용격기규약방법구해발사단시량우동신호。방진표명，제출적산법제고료다소구시량예편마적오마솔성능，사기우우이유적괴대각화급시량우동예편마등산법적오마솔。
In multiple-input multiple-output( MIMO) system with multiple cells cooperation, system per-formance 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 pro-posed to improve the performance in multiple cells system. The block diagonalization method is used to e-liminate 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.