A dynamic power allocation and relay selection scheme for energy-harvesting wireless networks

In this paper, a dynamic power allocation and relay selection scheme is developed to improve the outage performance of a wireless relaying network with multiple energy-harvesting relays. Firstly an optimization problem is formulated to minimize the overall outage probability under the constraint of energy limitations due to energy harvesting. Further the problem is approximated and then simplified into a geometric programming problem, based on which the simple power allocation and its corresponding best-relay selection scheme is developed. Simulation results verify the outage performance gain of the developed scheme.