Joint Resource Allocation for SWIPT-Based Two-Way Relay Networks

Abstract

This paper considers simultaneous wireless information and power transfer (SWIPT) in a decode-and-forward two-way relay (DF-TWR) network, where a power splitting protocol is employed at the relay for energy harvesting. The goal is to jointly optimize power allocation (PA) at the source nodes, power splitting (PS) at the relay node, and time allocation (TA) of each duration to minimize the system outage probability. In particular, we propose a static joint resource allocation (JRA) scheme and a dynamic JRA scheme with statistical channel properties and instantaneous channel characteristics, respectively. With the derived closed-form expression of the outage probability, a successive alternating optimization algorithm is proposed to tackle the static JRA problem. For the dynamic JRA scheme, a suboptimal closed-form solution is derived based on a multistep optimization and relaxation method. We present a comprehensive set of simulation results to evaluate the proposed schemes and compare their performances with those of existing resource allocation schemes.

Energy Optimization of a Laser-Powered Hovering-UAV Relay in Optical Wireless Backhaul

“…Additionally, they maximize the achievable rate of the system by optimally allocating power at each relay in the multihop link. The authors in [13] consider SWIPT for a two-way relay network where the minimize the outage probability by jointly optimizing power allocation of the source nodes, power splitting at relay nodes and the time allocation of each duration. The authors in [14] consider laser-powered UAVs for stochastic geometry-based analysis of airborne base stations.…”