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针对多输入多输出(MIMO)天线阵列在阵元间距较小及平均波达角较大时信道容量会急剧下降的问题,提出了基于Y型阵列结构的MIMO接收天线模型.利用天线阵列互耦效应等效网络模型,导出Y型阵模型的信道相关性和互耦相关性的闭合表达式,阐明了其阵列互耦效应下信道相关性与无互耦相关性之间的关系.分析了入射信号的中心到达角和角度扩展分别对互耦效应下Y型阵MIMO信道容量的影响.与均匀圆型天线阵列性能比较结果表明,Y型MIMO天线阵列能充分利用其空间结构,具有稳定的信道容量,且信道容量优于均匀圆型天线阵列,能有效地改善阵列互耦效应,提高系统性能.
Aiming at the problem that the capacity of MIMO antenna array drops sharply when the distance between array elements is small and the average angle of arrival is large, a MIMO receiving antenna model based on Y-array structure is proposed. Effect equivalent network model, the closed expression of channel correlation and mutual coupling dependence of Y-matrix model is derived, and the relationship between channel correlation and non-coupling correlation under array mutual coupling effect is clarified. The influence of signal center angle of arrival and angle spread on the Y-array MIMO channel capacity under mutual coupling effect respectively.Compared with the uniform circular antenna array, the results show that the Y-type MIMO antenna array can make full use of its spatial structure and has stable channel Capacity, and the channel capacity is superior to the uniform circular antenna array, which can effectively improve the array mutual coupling effect and improve the system performance.