多天线结构对无人机MIMO信道容量的影响

为进一步提高无人机(UAV)遥测链路传输容量,分析了无人机多输入多输出(UAV-MIMO)天线间隔、阵列等结构参数对信道容量的影响。建立了无人机MIMO基于散射体三维几何分布的单跳同心椭圆(GBSBCERS)信道模型,结合机载MIMO天线布局方案,给出了无人机MIMO信道矩阵及遍历容量的表达式。数值仿真表明,受无人机远距离通信的影响,信道容量与天线间隔呈正比变化;且相比于线阵布局,圆阵布局虽然受到无人机姿态变化的影响,但仍具有较高的信道容量。通过分析多天线结构对无人机MIMO信道容量的影响,对设计实现高速无人机数据链具有实际意义。

Antennas structures effect on capacity of UAV-MIMO channel

The effect of the structure parameters such as antennas' distance and array of unmanned aerial vehicle-multiple input multiple output (UAV-MIMO) was analyzed for the improvement of the transmission capacity of the UAV telemetering link. And the three-dimensional geometrically based single bounce concentric elliptic ring scattering (GBSBCERS) channel model of UAV-MIMO was set up. Furthermore, the formula of UAV-MIMO correlation matrix and ergodic capacity was given combined with the layout scheme of airborne MIMO. The simulation results show that the UAV-MIMO channel capacity will increase along with the increase of antenna distance with the influence of UAV remote communication, and though the circular array layout is affected by the change of UAV attitude, it improves the channel capacity more significantly than linear array layout. The research of the influence of antennas structures on the UAV-MIMO channel capacity shows a practical significance in application on high-speed UAV data line design.