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应用科学学报 ›› 2007, Vol. 25 ›› Issue (1): 21-25.

• 论文 • 上一篇    下一篇

基于RA准则的多用户OFDM自适应资源分配算法改进

王晏君, 陈前斌, 邝育军   

  1. 重庆邮电大学光互联网及无线信息网络研究中心, 重庆 400065
  • 收稿日期:2005-11-25 修回日期:2006-03-06 出版日期:2007-01-31 发布日期:2007-01-31
  • 通信作者: 陈前斌,博士,教授,研究方向:通信网理论与技术、个人通信等,E-mail:chenqb@cqupt.edu.cn E-mail:chenqb@cqupt.edu.cn
  • 基金资助:

    国家自然科学基金资助项目(90304004)

Improved Rate-Maximization-Based Adaptive Resource Allocation for Multiuser OFDM Systems

WANG Yan-jun, CHEN Qian-bin, KUANG Yu-jun   

  1. Special Research Center for Optical Internet and Wireless Information Networks, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
  • Received:2005-11-25 Revised:2006-03-06 Online:2007-01-31 Published:2007-01-31

PDF

278

被引次数

20

摘要：

针对现有最优算法计算复杂度高、不利于实时应用的不足,根据误比特率和总功率限制条件下多用户OFDM系统自适应资源分配的数学优化模型,从最大化系统容量的目标出发,提出了一种计算复杂度低、易于实现的子载波、比特及功率分配算法.理论分析和仿真结果表明,在时变无线信道中采用此算法的性能明显优于Lee提出的算法和静态资源分配算法(OFDM-TDMA),且计算复杂度低.

关键词: 多用户正交频分复用, 速率自适应准则, 自适应资源分配

Abstract:

Optimal adaptive resource allocation algorithms are computationally complex and time consuming, which is unfavorable for real-time application.To overcome this shortcoming, a rate-maximization-based low complexity adaptive resource allocation is proposed for multiuser OFDM systems, which maximizes the overall data rate under the constraint of total transmit power and BER performance.Simulation results show that the algorithm has better performance in terms of fairness and computational complexity comparing with original algorithm.

Key words: rate adaptive (RA), multiuser OFDM, adaptive resource allocation

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