瑞利衰落下车载辅助低检测概率通信研究

Research on vehicle-assisted low probability of detection communication under Rayleigh fading

随着第5代无线通信技术的高速发展,无线通信广播特性带来生活便利的同时也使得通信过程存在被非法用户拦截和窃听的风险。为了保护信息传输过程,低检测概率通信自提出以来逐渐受到学界和产业界的关注。与传统固定干扰辅助低检测概率通信不同,移动干扰辅助能够大幅提升低检测概率通信的场景适应性,论文建立了一种基于车载移动干扰辅助的低检测概率通信模型,并在瑞利衰落信道下使用波束成形技术,分析低检测概率通信性能。首先利用假设检验分析检测方检错概率并以此获得最优检测阈值;然后根据最优检测阈值分情况求解模型的平均隐蔽概率进而推导出中断概率的表达式;最后以隐蔽吞吐量为优化目标设计优化算法。仿真结果表明相比于固定干扰,采用车载移动干扰对低检测概率通信性能有所提升。

With the rapid development of the 5 th generation wireless communication technology, the broadcast features of wireless communication bring convenience to life, but also make the communication process has the risk of being intercepted and eavesdropped by illegal users. In order to protect the information transmission process, low probability of detection communication gradually attracts the attention of academia and industry. Different from the traditional fixed jammer assisted low probability of detection communication, mobile jammer assisted can greatly improve the scene adaptability of low probability of detection communication. This paper establishes a low probability of detection communication model based on vehicle-mounted mobile jammer, and uses beamforming technology to analyze the performance of low probability of detection communication in Rayleigh fading channel. Firstly, the error probability of test side is analyzed by hypothesis test and the optimal detection threshold is obtained. Then the average concealment probability of the model is solved according to the optimal detection threshold and the expression of interrupt probability is deduced. Finally, the optimization algorithm is designed with covert throughput as the optimization objective. Simulation results show that compared with fixed jammer, the performance of low probability of detection communication is improved by using vehicle-mounted mobile jammer.