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为了进一步提升无人机的通信容量,针对无人机信道的特点,提出了一种基于Ricean因子的无人机自适应MIMO通信方案.该方案利用了波束赋形(beamforming,BF)和空分复用(spatial multiplexing,SM)两种MIMO技术,通过Ricean因子实现BF与SM的自适应切换,并推导出了切换门限值的闭式表达式.相较于传统的无人机通信,该方案获得了更大的通信容量,且在高信噪比时容量提升显著.而与最优MIMO方案相比,所提出的自适应MIMO方案降低了计算复杂度.仿真表明,所提出的自适应通信方案可以进一步提高无人机通信容量.
In order to further improve the communication capacity of UAVs, a UAV adaptive MIMO communication scheme based on Ricean factor is proposed to deal with the characteristics of UAV channels. The scheme utilizes beamforming (BF) and space division The spatial multiplexing (SM) MIMO technique is used to realize the adaptive switching between BF and SM by Ricean factor, and the closed-form expression of the switching threshold is deduced. Compared with traditional UAV communication, The scheme achieves more communication capacity and the capacity is greatly improved at high signal-to-noise ratios, while the proposed adaptive MIMO scheme reduces the computational complexity compared with the optimal MIMO scheme.The simulation shows that the proposed adaptive Communication solutions can further improve UAV communication capacity.