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中文摘要：
针对正交频分多址接入一解码转发（OFDMA—DF）中继系统，提出了以最大化系统加权和速率为目标的子载波分配、功率分配、传输方式选择和中继选择联合优化问题．基于凸优化理论，提出了一种最优资源分配算法，其复杂度仅与子载波数成线性关系．理论分析和仿真结果表明，结合用户权重的调整，该算法既可实现资源分配的公平性，又可有效利用中继节点的能力，提高系统容量．
英文摘要：
The problems of the joint subcarrier allocation, power allocation, transmission mode selection and relay selection optimization which maximizes the weighted sum rate are addressed in orthogonal frequency division multiple access-based decode-and-forward （OFDMA-DF） relaying systems. Based on convex optimization theory, an optimal resource allocation algorithm is proposed. The complexity of this algorithm is only linear in the number of subcarriers. Simulation demonstrates that the scheme can achieve not only fair resource allocation but also effective relay utilization that enhances the system capacity through adjusting weighting factors for each user.
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