无人机联合D2D应急通信网络的性能分析

无人机与D2D(Device-to-Device)通信技术相结合可以作为应急通信网络的可行选项之一。受限于频谱资源,无人机与D2D用户往往采用共享频谱技术,这会导致网络中干扰链路增多,影响网络的通信性能。为此,将无人机配备定向天线以降低干扰的影响。为量化分析其对网络的具体影响,利用随机几何理论,对D2D通信与无人机通信共存的网络进行系统建模,推导了D2D用户成功传输概率的精确表达式以及无人机通信用户成功传输概率的上下界理论表达式,讨论了无人机密度以及天线阵子数等关键参数对系统性能的影响。仿真结果表明,相比全向天线,无人机配备定向天线可以有效地提高网络性能,且存在一个最优的无人机密度,使无人机通信用户的成功传输概率最大化。

Performance analysis of UAV joint D2D emergency communication networks

The coexisting network of unmanned aerial vehicles (UAV) and D2D communication can be one of the viable options for emergency communication network. Limited by spectrum resources, UAV and D2D users tend to share spectrum, which leads to increased interference link network, affecting the communication performance of the network. Therefore, directional antenna was adopted to be equipped on UAVs to reduce the interference impact. To quantitatively analyze its specific impact on the network, stochastic geometry was adopted to model the proposed network and derive the analytical expressions of the successful transmission probabilities for D2D users and UAV users. Then, the impacts of key parameters such as the UAV density and the antenna array size on the system performance were discussed. The simulation results show that, compared with omnidirectional antennas, UAV with directional antenna can effectively improve network performance, and there is an optimal density of UAVs that maximizes the successful transmission probability of UAV users.