Power Allocation in an RF Energy Harvesting DF Relay Network in the Presence of an Interferer

Abstract

In this paper, we study a cooperative wireless relay network in which multiple sourcedestination pairs communicate via a decode-and-forward relay, which harvests energy from the source transmissions in the presence of an interfering signal. The goal is to efficiently distribute the relay's power among the different relay-destination (R - D) links. The outage probability and the throughput in the delaysensitive transmission mode are derived for the non-shared and several shared power allocation schemes. Numerical results show that the studied shared allocation schemes outperform the non-shared allocation scheme in terms of outage probability and throughput. Different shared allocation schemes are compared against each other in terms of outage probability, throughput, and fairness. The R - D channel dependent and the weighted-sum-rate maximization schemes achieve the best outage and throughput performances but require knowledge of the statistical channel state information at the relay node. The results also illustrate the tradeoff between the throughput and fairness of the different shared allocation schemes.

Keywords

• Wireless relay network
• RF energy harvesting
• decode-and-forward
• outage probability
• throughput
• fairness