Half-Duplex Two-Way AF Relaying Network with Energy Harvesting

In this paper, we consider a three-node, half-duplex two-way relaying wireless network where an amplify-and-forward relay harvests energy from radio frequency wave transmitted by the two source nodes. Different from time switching (TS) and power splitting (PS), we group subcarriers to realize the information decoding (ID) and energy harvesting (EH) separately. This two-way relaying transmission is consisted of two phases, which is more efficiency and complicated than one-way relaying. System is orthogonal frequency division multiplexing modulated, and subcarrier grouping scheme is the same for the two source nodes. Subcarrier power of source nodes is average allocated, while that of relay is optimized. In this amplify-and-forward relaying network, subcarrier pairing is also under consideration. With the aim of sum rate maximized, we purpose a joint subcarrier grouping, relay subcarrier pairing and power allocation scheme. We use dual decomposition method to solve this problem, after transforming it into an equivalent convex optimization problem. Simulation results also show the impact of the relay location on subcarrier grouping and on sum rate.