Low complexity power allocation and joint relay-jammer selection in cooperative jamming DF relay wireless secure networks

In this paper, we investigate a low complexity power allocation and relay-jammer selection in a distributed wireless secure networks model with one source, one eavesdropper, one destination and multiple friendly intermediate nodes. A two-phase cooperative jamming scheme is proposed, in which one decode-and-Forward (DF) relay and one or two jammers are selected from the intermediate nodes to enhance security. Suboptimal algorithms of relay-jammer selection and also suboptimal power allocation between data signal and jamming noise of the first/second phase are proposed with low complexity. Simulation results illustrate that our proposed suboptimal algorithms perform close to the optimal one.