Research on Single-hop Anti-eavesdropping Technology Based on Double Full-duplex Cooperative Interference

Aiming at the problem that the eavesdropper's CSI is difficult to obtain, combined with the characteristics of satellite channel, a single hop anti eavesdropping method based on dual full duplex cooperative interference is proposed in this thesis. This method does not need the CSI between the ground terminal and the eavesdropper, gets rid of the dependence of the existing satellite communication anti eavesdropping technology on the eavesdropper CSI, and has high robustness. Firstly, a single hop anti eavesdropping model based on dual full duplex cooperative interference is established. On this basis, the expressions of signal to interference noise ratio (SINR) are derived respectively between legitimate terminal and eavesdropper in the case of residual self-interference and complete elimination of self-interference in full duplex receiver, and then the expression of system security rate is given. Then, under the constraints of system total power and user information rate, the optimal power allocation problem is established, and its optimal closed-form solution is obtained. Finally, the correctness of the theoretical derivation is verified by simulation. The simulation results show that the optimal power allocation scheme proposed in this thesis can significantly improve the system security compared with the equal power allocation scheme.