提高小尺寸间距四元MIMO系统信道容量与容量稳定性的新方法  

New method to improve the channel capacity and capacity stability of 4-element MIMO systems with close antenna spacing

作　　者：李岳衡[1,2] 赵静[1] 居美艳[1] 殷兴辉[1] 

机构地区：[1]河海大学计算机与信息学院,江苏南京210098 [2]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《通信学报》2011年第6期86-92,共7页Journal on Communications

基　　金：江苏省自然科学基金资助项目(BK2008358;BK2008357);东南大学移动通信国家重点实验室开放研究基金资助项目;中央高校基本科研业务费专项基金资助项目(2011B03414)~~

摘　　要：针对小尺寸间距MIMO系统阵元间严重的互耦效应将导致传统直线排列阵信道容量明显下降以及随着入射波平均到达角的增大系统信道容量亦会迅速降低的问题,通过考察空域相关接收信号等效方向图产生畸变的物理原理,提出了一种通过重构阵列排布模式以令其具正方形空间对称特性从而改善系统容量稳定性的新方法。理论分析和数值仿真皆表明,相比于传统四元直线阵,这种由新方法构造的具空间对称结构的四元方阵MIMO系统不仅在小尺寸阵元间隔具强互耦效应时能提高系统信道容量,还具有平均信道容量不随入射波平均到达角变化而基本保持恒定的优点。With respect to the problems that the severe mutual coupling （MC） caused by close antenna sapcing will decrease the channel capactiy of the traditional 4-element uniform linear array （ULA） MIMO systems, and that the capacity will also decrease rapidly with the increment of incoming wave＇s mean angle of arrival （AoA）, a new method to improve the system＇s capacity performance by reconstructing the ULA array layout was proposed based on deeply investigating the reason of the distortion of equivalent antenna radiation pattern. Both theoretical analysis and numerical results show that compared with the traditional 4-element ULA, this 4-element squared antenna array （SAA） with spatially symmetric structure can not only improve the final channel capacity when there is severe MC effect in the case of small antenna spacing, but also have the advantage of keeping nearly unchanged channel capacity as the mean AoA of the incoming waves varies.

关 键 词：互耦效应 空域相关性 信道容量 四元线阵 四元方阵 

分 类 号：TN911.2[电子电信—通信与信息系统] TN929.5[电子电信—信息与通信工程]