无人机短包通信中基于NOMA传输的安全性能分析

针对物联网（IoT）通信的低延时需求，为了保证数据传输的灵活性，本文构建一种基于短包传输的无人机（UAV）通信网络。由于非正交多址接入（NOMA）技术能够增加可服务的地面用户数量，故将该技术应用到无人机短包通信（UAV-SPC）系统中可以解决多用户的安全传输问题。与正交多址（OMA）技术相比，NOMA可有效提高用户接入公平性和频谱利用率，因此被广泛用于下行链路的通信传输。为解决复杂的安全传输问题，首先证明在功率和译码错误率约束的条件下，分别存在最优的功率分配，数据传输包长和系统传输比特数使目标用户的平均安全吞吐量最大。在此基础上，通过本文所提算法得到安全传输问题的优化解。实验结果验证了该算法的稳定性和可行性。此外，与基准方案相比，本文所提方案可有效降低短包传输的通信时延，提高系统中目标用户的平均安全吞吐量。 

Security Performance Analysis Based on NOMA Transmission in UAV Short Packet Communication

? ?For the low-latency demands of Internet of Things （IoT） communication and to ensure the flexibility of data transmission， the unmanned aerial vehicles （UAV） communication network based on short packet is proposed in this paper. Since the non-orthogonal multiple access （NOMA） technology can increase the number of served ground users， its application to UAV short packet communication （UAV-SPC） system can solve the problem of secure transmission for multi-user. Compared with orthogonal multiple access （OMA）， NOMA can effectively improve the channel access fairness and spectrum efficiency of the users， so it is widely used in downlink communication transmission. To solve the complex secure transmission problem under the constraints of power and decoding error rate， the existance of the optimal allocation of power， data transmission packet length and system transmission bits to maximize the average security throughput of target user is first proved. On this basis， the optimal solution of the secure transmission problem is obtained by the algorithm proposed in this paper. Experimental results validate the stability and feasibility of the algorithm. In addition， compared with the benchmark scheme， the proposed scheme can effectively reduce the communication delay of short packet transmission and improve the average security throughput of target users in the system.