Multibeam SATCOM systems design with physical layer security

Recently, physical layer security (PHY-SEC) has been investigated for wireless communications to prevent eavesdropping without upper layer data encryption. This paper addresses multibeam satellite secure communication using PHY-SEC. We propose a novel system design that minimizes the satellite transmit power subject to the individual secrecy rate requested per user constraints. An iterative algorithm is proposed to update the transmission power of each beam and to achieve the optimal power allocation strategy. The convergence property of the algorithm is proved under justifiable assumptions. The performance is evaluated taking into account the impact of the channel condition with given individual secrecy rate requirement.