Research on Multiple Eavesdroppers Selection of Proactive Eavesdropping System

There may be suspicious users communicate by simple mobile communication equipment for illegal communication situation, 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 self-interference cannot be completely eliminated, three different options was proposed. And 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 single user eavesdropping.