In this paper, we investigate the benefits of uniform circular arrays (UCAs) as an alternative antenna deployment to uniform linear arrays (ULA), which are commonly applied for multiple-input multiple-output (MIMO) systems. We consider a MIMO satellite link with focus on the Line-of-Sight (LOS) signal component of the MIMO channel between two geostationary satellites and a mobile earth terminal equipped with several antennae. The MIMO LOS channel is optimized with respect to the maximum achievable spectral efficiency. The aim of our approach is to keep this optimum spectral efficiency nearly constantly even if the terminal on earth is moving. We provide an analytical derivation for the optimum UCA arrangement and prove our results by numerical simulations. Especially for mobile applications, the UCA antenna arrangement seems to be a reasonable candidate in order to guarantee high capacity performance durably. To this end, we present a very simple triangle shaped antenna arrangement which is compact enough to allow vehicle roof top installations for S-band applications.
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机译:在本文中,我们研究了均匀圆形阵列(UCAS)作为替代天线部署的均匀线性阵列(ULA)的益处,其通常应用于多输入多输出(MIMO)系统。我们考虑一个MIMO卫星链接,专注于两个地球静止卫星之间的MIMO通道的视线(LOS)信号分量和配备有多个天线的移动地球终端。 MIMO LOS通道是针对最大可实现的光谱效率进行优化的。我们的方法的目的是保持这种最佳光谱效率几乎不断地,即使地球上的终端正在移动。我们为最佳UCA排列提供分析推导,并通过数值模拟证明我们的结果。特别是对于移动应用,UCA天线布置似乎是合理的候选者,以便保证高容量的性能。为此,我们提出了一种非常简单的三角形天线布置,其足够紧凑,以允许车辆屋顶的S频带应用。
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