中文摘要：

在MIMO多天线系统中，由于移动通信设备的空间较小，天线的间距受限，致使信噪比增益达不到预想的效果。将反向对称法（Phase-Inversion Symmetric Method，PISM）与MIM0技术相结合，应用于移动通信设备的双天线设计中，通过噪声的相关性原理达到抑制噪声的目的。通过构建PISM—MIMO系统，理论分析结果表明该系统的信噪比增益为G=4／（1-ρ），（ρ是相邻信道噪声的相关系数）只要ρ〉0，则本系统就优于常用系统，实验证明噪声具有相关性，即ρ〉0。用Matlab仿真软件仿真，得到结果与理论推导一致。

英文摘要：

Because of the limit of the space in the mobile devices there is no enough distance between each pair of antennas of the MIMO multiantennas system to get an ideal noise correlation. With the combination of the PISM and MIMO for the twin antennas design in the mobile devices, the noise can be decreased according to the theory of noise correlation. In this article, by the theory analysis, it was obtained that the signal-to-noise enhancement is Gp =4/（1-ρ）, where ρ is the coefficient of noise correlation of the adjacent channels, and the designed PISM-MIMO system is better than the usual system if ρ〉0. The experiment proved that the noise is correlated, i.e. ρ〉0. The result by the software simulation using Matlab also corresponded to the theoretical analysis.