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基于GPS调度的OFDM系统低复杂度资源管理

周 晶， 景志宏   

  1. 空军工程大学 电讯工程学院， 陕西 西安 710077
  • 收稿日期:2007-06-20 修回日期:2007-09-21 出版日期:2008-01-31 发布日期:2008-01-31

Low Complexity Resource Management for OFDM Systems Based on GPS Scheduling

ZHOU Jing, JING Zhi-hong   

  1. Telecommunication Engineering Institute, Air Force Engineering University, Xi’an 710077, China
  • Received:2007-06-20 Revised:2007-09-21 Online:2008-01-31 Published:2008-01-31

摘要： 针对OFDM系统的下行链路，提出了一种基于广义处理器共享（GPS）调度的低复杂度资源管理方案。方案通过MAC层－物理层的跨层设计达成了信道容量与用户公平性之间较好的折中：在MAC层采用GPS并行调度来达成用户对带宽的公平共享，并进一步提出了通过用户权重补偿来改进公平性的方法；在物理层结合采用次优子载波分配、平均功率分配和自适应调制以充分利用信道容量。仿真结果表明，本方案以较低的实现复杂度实现了与Shen提出的带比例速率限制的资源分配算法相近的性能。

关键词: 正交频分复用, 资源管理, 广义处理器共享, 跨层设计, 权重补偿

Abstract: A low complexity resource management scheme based on generalized processor sharing (GPS) scheduling for the downlink of OFDM systems is proposed. By using the MAC-PHY cross-layer design method, the proposed scheme gives a good tradeoff between channel capacities and user fairness. It can achieve fair bandwidth sharing among users by GPS scheduling in the MAC layer, while integrating sub-optimal subcarrier allocation, equal power distribution and adaptive modulation to exploit the available channel capacities in the PHY layer. Furthermore, we propose a weight compensation method to improve fairness of GPS bandwith sharing. Numerical results demonstrate that the scheme offers performance comparable to an existing algorithm, with lower computational complexity.

Key words: OFDM, resource management, generalized processor sharing, cross-layer design, weight compensation.