论文部分内容阅读
多天线构成的多输入多输出MIMO(Multiple-Input Multiple-Output)信道是B3G/4G系统的关键技术之一。文章建立下垫三维粗糙面的MIMO信道模型,用基尔霍夫(KA,Kirchhoff approximation)近似随机粗糙面散射的数值计算方法研究下垫粗糙面产生的随机多路径传输对MIMO信道矩阵的影响,并数值地讨论接收、发射天线阵列位置以及下垫粗糙面几何参数对MIMO系统信道容量的影响。结果表明,双站距离大、天线高度低时,下垫随机粗糙面对MIMO信道容量的影响显著。当天线阵元间距小时,下垫粗糙面将显著增大MIMO系统信道容量;当天线间距大时,粗糙面减小MIMO系统信道容量。
Multi-Input Multiple-Output (MIMO) channel with multiple antennas is one of the key technologies in B3G / 4G systems. In this paper, a MIMO channel model of a three-dimensional matured surface is established, and the effect of stochastic multipath propagation on the MIMO channel matrix is studied by using numerical approximation of random rough surface scattering with KA (Kirchhoff approximation) The effects of receiving, transmitting antenna array position and underlay mathematic parameters on channel capacity of MIMO system are discussed numerically. The results show that when the distance between two stations is large and the antenna height is low, the influence of random matured surface on MIMO channel capacity is obvious. When the spacing between antenna elements is small, the mat rough surface will significantly increase the channel capacity of the MIMO system; when the antenna spacing is large, the matte surface will reduce the channel capacity of the MIMO system.