基于干扰辅助下的多监听器COMP联合监听技术

Multi⁃monitor COMP joint eavesdropping technology based on assisted jamming

在无线通信领域,COMP联合通信因其能够显著增强信号质量被广泛运用。考虑利用COMP技术提升物理层信息监听性能,文中采取多个合法监听器对多个正交的可疑通信对进行联合监听,并进一步利用无人机对这些可疑通信对实施干扰,旨在联合优化无人机的位置以及干扰功率分配,以最大化多个可疑通信对的最小监听成功概率。文中使用蒙特卡罗法验证了COMP信噪比的累积分布函数(CDF)近似值和精确值,鉴于提出的优化问题高度非凸,采用连续凸近似和块坐标下降算法对无人机的位置和干扰功率分配进行交替优化,以获取局部最优解。仿真结果表明,相较于其他方案,所提出的方案能够显著提升系统最小监听成功概率。

In the field of wireless communication,COMP(coordinated multi⁃point transmission)joint communication is widely used because it can enhance the signal quality significantly.In this paper,the COMP technology is proposed to enhance the performance of physical layer information monitoring.Multiple legitimate monitors are adopted to jointly eavesdrop multiple orthogonal suspicious communication pairs.Furthermore,UAV(unmanned aerial vehicle)is utilized to jam these suspicious communication pairs.The aim of this paper is to jointly optimize the location of the UAV as well as the jamming power allocation to maximize the minimum probability of success among multiple suspicious communication pairs.The Monte Carlo method is used to verify the approximate value and exact value of the cumulative distribution function(CDF)of the COMP signal⁃to⁃noise ratio(SNR).Given that the proposed optimization problem is highly non⁃convex,successive convex approximation(SCA)and block coordinate descent(BCD)method are used to optimize the position of the UAV and the jamming power allocation alternately in order to obtain a local optimal solution.Simulation results show that the proposed scheme can significantly improve the minimum eavesdropping success probability of the system in comparison with the other schemes.