Trajectory optimization of CSTBC UAV relay communication systems with no-fly zone constraints
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摘要:
中继无人机的飞行路径对无人机中继通信系统的链路传输可靠性具有重要影响。为提高无人机中继通信系统链路传输的可靠性，提出协作空时分组编码(CSTBC)无人机中继通信方案，并以链路中断概率最小化准则为基础，提出中继无人机的航迹优化方法；理论分析给出系统遍历容量和分集增益；为保障中继无人机飞行安全，并获取信道的分集增益，提出无人机禁飞区规避方法。结果表明：协作空时分组编码无人机中继通信系统可充分获取信道的分集增益，改善无人机中继通信系统链路传输的可靠性。
Abstract:The flight path of an UAV has a significant effect on the performance of a UAV relay communication system. To increase transmission reliability, a cooperative space-time block coding (CSTBC) UAV relay communication transmission technique with no-fly zone restrictions is suggested. The outage probability of the UAV relay communication system is theoretically derived, and the UAV flight path is optimized to minimize the system’s outage probability. The UAV relay communication system’s ergodic capacity is also presented. In addition, we established a no-fly zone and provided an evasive mechanism to ensure cooperative UAV flight safety while obtaining the channel’s diversity gain. The simulation findings demonstrate that the cooperative space-time block coding-based UAV relay communication transmission method may get the channel’s diversity gain and enhance the system’s link transmission performance.
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图 7 不同方法下中断概率与遍历容量
Figure 7. Interruption probability and ergodic capacity under different methods
图 9 不同方案下中断概率与遍历容量
Figure 9. Interruption probability and ergodic capacity under different plans
图 11 不同路径损耗因子时的中断概率与遍历容量
Figure 11. Interruption probability and ergodic capacity under different path loss factors
表 1 仿真参数设置
Table 1. Simulation parameter setting
参数 数值 MU节点的初始位置坐标/m (500,2500,0) UAV1节点的初始位置坐标/m (1000,4000,350) UAV2节点的初始位置坐标/m (1000,1000,350) BS节点的初始位置坐标/m (4500,2500,0) MU节点的移动速度/(m·s−1) 10 无人机的飞行速度/(m·s−1) 30 禁飞区范围（y轴）/m 2000～3000 仿真时间/s 300 位置更新时间间隔$\Delta t $/s 1 路径损耗因子$ \alpha $ 2.0 MU节点发射功率/dB 150 无人机转发功率/dB 147 中断门限/dB 5 
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