Secure Resource Allocation for OFDMA Two-Way Relay Networks
In this paper, the authors consider the problem of secure resource allocation in Orthogonal Frequency Division Multiple Access (OFDMA) two-way relay networks. Multiple sources exchange information with the assistance of an Amplify-and-Forward (AF) relay node in the presence of an eavesdropper. The joint subcarrier allocation, subcarrier pairing and power allocation problem aims to maximize the secrecy capacity for legitimate sources subject to limited power budget and orthogonal subcarrier allocation constraints. The optimization problem is modeled as a mixed integer programming problem, and then solved in an asymptotically optimal manner based on the dual method.