基于QuaDRiGa的无人机非平稳信道模型

A Non‑stationary UAV Channel Model Based on QuaDRiGa

为了解决无人机信道模型非平稳参数空时不连续的问题,提出了一种支持三维运动及姿态旋转的无人机非平稳几何随机模型,用于描述和模拟无人机对地多输入多输出通信信道的真实特性。该模型借鉴QuaDRiGa中的“准确定性”思想,基于收发端拓扑关系更新时变信道参数,考虑路径生灭概率改进信道功率计算方法,引入姿态相位矩阵描述无人机姿态旋转,以实现无人机非平稳信道参数的平滑演进。数值仿真结果表明,本文提出模型能够保证功率和角度等参数的平滑演进,输出信道的自相关函数具有非平稳性且受无人机姿态影响显著,可用于无人机通信系统设计和算法优化等领域。

In order to solve the space-time discontinuity problem of unmanned aerial vehicle(UAV)nonstationary channel parameters,this paper proposes a non-stationary geometric stochastic model of UAV that supports three-dimensional motion and posture rotation,which is used to describe and simulate the real characteristics of UAV multiple-input multiple⁃output communication channel.Based on the concept of“accurate qualitative”in QuaDRiGa,the model update time-varying channel parameters based on the topological relation of receiver and transmitter,improve the channel power calculation method considering the probability of path birth and death,and introduce posture phase matrix to describe UAV posture rotation,so as to realize smooth evolution of UAV non-stationary channel parameters.The numerical simulation results show that the model proposed in this paper can ensure the smooth evolution of parameters such as power and angle,and the autocorrelation function of the output channel is nonstationary and significantly affected by UAV posture.The proposed model can be used in UAV communication system design and algorithm optimization.