【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。更多还原

【Abstract】 With respect to the problems that the severe mutual coupling(MC) caused by close antenna sapcing will de-crease 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.更多还原