Robust secure transmission with cooperative jamming in hybrid full/half duplex relay network

In this paper, considering the worst case channel uncertainty, we propose a robust secure design with cooperative jamming strategy in decode-and-forward relay network. Practically, it is difficult for the full-duplex model to eliminate the self-interference and experience indicates that full-duplex schemes may not always outperform half-duplex schemes. Thus, we employ the hybrid full/half-duplex protocol to reduce the influence of self-interference. Considering imperfect eavesdropping channel condition, we propose a worst-case robust design to obtain jamming weights, which is solved through semi-definite program. Furthermore, we analyze secrecy rate and secrecy outage performance of the proposed scheme. As a benchmark, a traditional full-duplex multi-relay system based on equal-power is proposed for comparison. Simulation results demonstrate that our hybrid strategy with robust design outperforms the traditional full-duplex scheme.