Information-Theoretic Security and Energy Efficiency for Information and Power Transfer in Two-Hop Wireless Relay Networks

In this paper, we study the problem of power allocation to maximize the transmission energy efficiency (TEE), while satisfying the security requirements in a wireless relay network. To the best of our knowledge, this is the first work that jointly consider the energy efficiency and security requirements in two-hop wireless secure communication. A linear relaxation method and iterative algorithm are proposed to solve this optimization problem and obtain approximation of the optimal solution. We perform simulations to investigate the TEE performance under different power allocation and antennas deployment strategies. The numerical results verify the effectiveness of our optimization.