Energy efficient resource allocation for secure OFDMA relay systems with eavesdropper

Abstract

In this paper, we address the energy efficient resource allocation problem for a secure orthogonal frequency division multiple access (OFDMA) relay system. In particular, we consider there is a eavesdropper near the base station (BS) which tries to overtake the information sent by BS. We formulate the joint optimization problem with the objective to optimize the energy efficiency of the considered system by considering subcarrier pairing, secret data rate and power allocation. In addition, the system can assign different priority to different users such that the security of information transmission can be guaranteed. The proposed iterative algorithm not only maximizes the system energy efficiency but can guarantee quality-of-service (QoS) properties. Simulation results show that the proposed scheme can obtain the energy efficiency maximization and also illustrate that the strategy of giving different priority to different users obtain a higher energy efficiency.