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

摘要： 针对放大-转发OFDMA中继系统的多用户比例公平资源分配问题, 在独立功率约束条件下，提出一种联合的子载波和功率分配的调度方案。方案将该资源分配问题的计算转化为对其对偶问题的计算，通过计算对偶问题间接获得原问题的解。对于对偶问题的计算采用次梯度方法。在每次迭代计算过程中，利用Hungarian算法进行最佳的子载波配对，子载波对的用户分配采用比例公平原则，利用改进的注水算法进行功率调整。仿真分析表明，在多用户比例公平的原则下所提方案的频谱效率得到明显提高。

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