Improving physical layer security of cooperative relay networks via destination jamming
This paper studies the security of cooperative relay networks, where the amplify-and-forward (AF) scheme is adopted. A new cooperative jamming method is proposed according to analog network coding (ANC) technique. A fraction of power is allocated to the destination node for transmitting jamming signals in the first phase. In the second phase, the relays utilize zero-forcing beamforming to prevent the information leakage to the eavesdropper. And then, optimal power allocation between the transmitters is addressed by geometric programming (GP). Numerical results are provided to illustrate the efficacy of the proposed scheme.