Secrecy Rate Region of Wiretap Interference Channels with Energy Harvesting Receivers

The secrecy rate region of wiretap interference channels under receiver energy harvesting constraint is studied. The legitimate users are equipped with single transmit/receive antennas, while the passive eavesdropper has multiple antennas. To stay operational in the network, the legitimate receivers demand energy alongside information, which is fulfilled by power transmission and exploiting a power splitting receiver. In order to achieve the secrecy rate region frontier, smart tuning of the transmit power and receiver power splitting coefficient is required. In this paper, we propose an efficient algorithm to optimize these parameters jointly in polynomial time. The secrecy rate region characterization is formulated as a weighted maxmin optimization problem. This problem turns to be a nonconvex problem due to the non-convex constraint set. This set is lower-bounded by a convex set which in consequence results in an achievable suboptimal solution that is improved iteratively. Finally, we compare the achievable secrecy rate region of legitimate users with a weak and strong eavesdropper under legitimate users’ energy harvesting constraints.