Binary Information Press
In this paper, the authors study 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 beam forming 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.