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简单概括了无线多输入多输出(MIMO)系统及其信道容量,应用矩量法分析了因互耦作用引起的天线阵各阵元辐射图的变化,进而应用已提出的射线追踪模型分析了一个4.4MIMO系统接收端阵元间距不同时互耦作用对信道容量的影响。仿真结果说明在接收端使用多天线,阵元间距不可能太大的情况下,考虑互耦作用后,在小阵元间距(d=0.4λ)时就可得到较大的信道容量。得出结论在接收端阵元间距较小的情况下,互耦是一个有利的因素,在系统分析和设计时可以有效地加以利用。
The wireless MIMO system and its channel capacity are briefly summarized. The change of the radiation pattern of each antenna array due to mutual coupling is analyzed by using the method of moment, and then the proposed ray tracing model is used to analyze a 4.4MIMO system receives the end of the element spacing is not the same effect of mutual coupling on the channel capacity. The simulation results show that when using multi-antenna at the receiving end and the array element spacing can not be too large, after considering the mutual coupling effect, larger channel capacity can be obtained at small array element spacing (d = 0.4λ). It is concluded that the mutual coupling is a favorable factor in the case of small spacing between the receiving end elements and can be effectively utilized in system analysis and design.