SWIPT for wireless cooperative networks

Simultaneous wireless information and power transfer (SWIPT) in wireless cooperative networks is studied, where multiple source-destination pairs establish a communication link via an energy harvesting (EH) relay. The relay employs a power splitting (PS) scheme to harvest the energy sent from each source, which it uses to forward the transmissions to the destinations. The total transmission rate maximisation problem is investigated subject to transmit power and EH constraints, which can be divided into each source-destination node´s transmission rate based on a non-cooperative transmission strategy. This problem is addressed to obtain the optimal PS ratio and power allocation, and derive a closed-form solution. Numerical results are also provided to validate the performance of this proposed scheme, which outperforms a scheme with a uniform PS ratio.