摘要
针对正交频分多址接入-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.
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.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2010年第1期12-17,共6页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金项目(60872049
60871042
60971082
60972073)
国家高技术研究发展计划项目(2007AA10Z235)
国家重点基础研究发展计划项目(2009CB320407)
国家重大科技专项项目(2009ZX03003-001
2009ZX03003-011)
教育部留学归国人员教学
科研建设项目
关键词
正交频分多址接入
中继系统
解码转发
最优资源分配
凸优化
orthogonal frequency division multiple access
relaying system
decode-and-forward
optimal resource allocation
convex optimization
