主动窃听系统中的多窃听用户选择技术研究

Research on Multiple Eavesdroppers Selection of Proactive Eavesdropping System

针对可能存在可疑用户采用简易移动通讯设备进行非法通信的情况,研究了一种在瑞利信道下用于合法部门监听可疑用户的主动窃听系统。该系统采用多窃听用户进行主动窃听,考虑到全双工主动窃听者在窃听的同时能够对可疑目的用户进行干扰,且自干扰无法完全消除,提出了三种不同的多窃听选择方案,并给出了三种方案下窃听不中断概率的半闭合表达式。理论分析与数值仿真结果表明,这三种方案下的主动窃听性能由于侧重点的不同在干扰功率高低情况下各有优劣,但总的来说低干扰功率情况下方案二的性能最优,而在高干扰功率下方案三明显更占优势,且这三种方案都优于传统单用户窃听。

In order to avoiding the situation that the suspicious users communicate by simple mobile communication equipment for illegal behavior,so a proactive eavesdropping system of Rayleigh channel was studied for legal department to monitor suspicious users.The system adopts multiple eavesdropping users to conduct proactive eavesdropping.Considering that full duplex active eavesdropping users can interfere with suspicious users while eavesdropping and the self-interference cannot be completely eliminated,three different options was proposed.Besides,the approximate closed-form expression of eavesdropping non-outage probability was derived under these kinds of schemes.The theoretical analysis and numerical simulation results show that,the proactive eavesdropping performance of these three schemes has its own advantages and disadvantages in the case of high or low jamming power due to different emphases.But in general,the performance of the second scheme is the best under the condition of low jamming power,while the third scheme is obviously superior under the condition of high jamming power,and these three schemes are better than traditional scheme with single eavesdropper.