Combating Malicious Eavesdropper in Wireless Full-Duplex Relay Networks: Cooperative Jamming and Power Allocation

In this paper, the physical layer security in decode-and-forward wireless full-duplex relay network was investigated. In this scenario, an eavesdropper was present. For improving the physical layer security, the source and relay not only transmitted message signal but also transmitted jamming signal to interference with the untrusted eavesdropper, which needed not external friendly jammers. How to allocate the power to transmit message signal and jamming signal was a problem. Furthermore, the constrained optimization problem was formulated and the optimal power allocation solution was derived. Compared with other cooperative jamming schemes, our proposed scheme will effectively improve physical layer security of the legitimate user. And simulation results verify the properties.