关键词: 资源调度, 正交频分多址, 放大-转发, 比例公平, 对偶方法

Abstract: The proportional fair-based resource allocation problem is studied for Amplify-and-Forward（AF） Orthogonal Frequency Division Multiple Access（OFDMA） relay systems. A joint subcarrier and power allocation scheme is proposed with separate power constraints. The primal problem is transformed into dual problem with dual method. The dual problem is solved with subgradient method. Subcarriers at source and relay node are paired with the Hungarian method. The paired subcarriers are allocated to user with the maximum value of proportional fairness. Power allocation is solved with modified water-filling method. Simulation result shows that the proposed scheme has a good performance in system capacity and proportional fairness.

Key words: resource scheduling, Orthogonal Frequency Division Multiple Access（OFDMA）, Amplify-and-Forward（AF）, proportional fairness, dual method