Disaster-Recovery Communications Utilizing SWIPT-based D2D Relay Network

In this paper, we investigate disaster-recovery communications utilizing simultaneous wireless information and power transfer (SWIPT) enabled decode-and-forward (DF) relay D2D network. Specifically, there is a disaster area between the source node and the target node, and the relay cannot be installed in the disaster area. So the optimal location for the relay must be found in the healthy area. Moreover, unlike the existing with the assumption of linear or piece-wise linear energy harvesting (EH) model, a realistic scenario of the nonlinear EH model has been taken into account. In particular, we formulate an optimization problem by jointly optimizing the transmit power of the source node, the power-splitting (PS) ratio of the relay, and the location of the relay. Since the formulated problem is difficult to solve, an iterative algorithm is developed to obtain the optimal target rate. Simulation results verify the proposed algorithm and show that the designed system scheme is superior to other benchmark schemes.