基于Y型阵MIMO天线互耦效应及信道容量  

Study on Mutual Coupling Effects and Channel Capacity of MIMO Antenna Based on Y-Shaped Array

作　　者：周杰[1,2] 季榉[1] 菊池久和 

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044 [2]国立新泻大学工学部电气电子工学科

出　　处：《北京邮电大学学报》2013年第4期85-89,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金面上项目(61072137);江苏省科技支撑计划(工业)项目(BE2011195);江苏省高校自然科学研究计划项目(08KJB510009);教育部留学基金委启动项目(教外司留20071108);江苏省六大高峰人才项目(2008118);江苏省博士后基金项目(2011-11-010986678)

摘　　要：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.Considering that the channel capacity sharply declines when the array element spacing is rela- tively small and the average direction of arrival （DOA） is large in multiple-input multiple-output （MI- MO） antenna array, a new MIMO receiving antenna model is put forward based on Y-shaped array struc- ture. Utilizing equivalent network model of antenna array＇ s mutual coupling effects, the general closed form expressions is deduced for correlations of Y-shaped array mode and mutual coupling so as to clarify the relations between the correlation with its array mutual coupling effects and the correlation without mu- tual coupling effects. The influences of incident signal＇ s central DOA and angular spread on the channel capacity of Y-shaped array MIMO is analyzes respectively. Comparing with analysis and performance of MIMO circular array receiving antenna, it is found that Y- shaped MIMO antenna array is of a relatively stable channel capacity and better than that of the circular antenna array. It can effectively improve the array mutual coupling effects so as to enhance the system performance.

关 键 词：Y型天线阵列 互耦效应 空间相关性 MIMO信道容量 

分 类 号：TN911.6[电子电信—通信与信息系统]