Optimal Resource Allocation For SWIPT System On Energy Harvesting And Information Security

With the development of wireless communications, more and more innovativetechnologies are applied into the communications network. In this context, the appearanceof Simultaneous Wireless Information and Power Transfer (SWIPT) makes it possible forthe transmission of information and power at the same time, which has already being ahot topic in the future research direction of wireless communications. Besides, the SWIPTtechnology not only fits the pursuit of green energy, but also guarantees the security ofinformation transmission. This paper adopts the dynamic power spitting design tosimultaneously transfer wireless information and power, introduces Signal to LeakageNoise Ratio (SLNR), secrecy capacity and so on, proposes research source allocationschemes base on the SWIPT system.To begin with, this paper proposes a joint optimal beamforming scheme design toachieve the joint optimal sum-capacity between the base station and users under theconstraint of SLNR. What’s more, it also presents the so-called robust solution under theimperfect CSI case. In addition, the numerical result shows the performance between thesum-capacity, harvested energy and the number of users under different channeluncertainty cases.Besides, with considering secrecy information transmission, this paper also proposesan optimal beamforming design for SWIPT system in the presence of eavesdroppers. Itformulates two equivalent optimization problems, i.e., the transmit power minimizationproblem under SINR and required harvested energy constraints and the secrecy ratemaximization problem under total transmit power and harvested energy constraints. Byapplying the semi-definite relaxation and S-produce technologies, both the optimal andsuboptimal solutions are provided to solve these two problems under perfect CSI andimperfect CSI cases. The numerical results show the performance between the secrecyrate, harvested energy, the number of eavesdroppers, channels’ path loss and totalconsumption power.