Optimal Power Splitting in Two-Way Decode-and-Forward Relay Networks

This letter investigates simultaneous wireless information and power transfer in two-way decode-and-forward relay networks, where the relay is an energy-constrained node but is capable of harvesting energy from the radio frequency signal transmitted by the source nodes for forwarding its information. The achievable sum-rate of such network with the power splitting relay protocol is analyzed first. Then, the optimal design of the power allocated for energy harvesting and for information decoding in the sense of maximum achievable sum-rate is determined. Simulation results are presented to assess the influence of various system parameters. The performance of the optimal design is compared with that of amplify-and-forward relay protocols.