华南理工大学学报(自然科学版) ›› 2005, Vol. 33 ›› Issue (3): 40-43.

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多用户OFDM系统中的快速自适应分配策略

柯峰 叶梧 冯穗力 龚汉东   

  1. 华南理工大学 电子与信息学院,广东 广州 510640
  • 收稿日期:2003-10-27 修回日期:2004-11-17 出版日期:2005-03-25 发布日期:2005-03-25
  • 通信作者: 柯峰(1975-),男,博士,讲师,主要从事移动通信理论与技术的研究 E-mail:fengke@scut.edu.cn
  • 作者简介:柯峰(1975-),男,博士,讲师,主要从事移动通信理论与技术的研究
  • 基金资助:

    广东省工业攻关资助项目(2002A1030405)

Rapid Adaptive Allocation Strategy in Multiuser OFDM System

Ke Feng  Ye Wu  Feng Sui-li  Gong Han-dong   

  1. College of Electronic&Information Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2003-10-27 Revised:2004-11-17 Online:2005-03-25 Published:2005-03-25
  • Contact: 柯峰(1975-),男,博士,讲师,主要从事移动通信理论与技术的研究 E-mail:fengke@scut.edu.cn
  • About author:柯峰(1975-),男,博士,讲师,主要从事移动通信理论与技术的研究
  • Supported by:

    广东省工业攻关资助项目(2002A1030405)

摘要: 将自适应技术应用于多用户正交频分复用(OFDM)系统,能够提高频谱利用率,降低系统发射功率,从而使系统的整体性能达到最优.文中给出了多径频率选择性衰落信道下多用户OFDM系统中自适应比特和功率分配的数学模型,提出了一种次优快速自适应分配算法,根据信道特性的瞬时估计值,自适应地为各用户分配子信道和比特,在给定误码率的条件下使总的发送功率最小、仿真结果表明,该算法计算简单,优化效率高,可以达到接近理论上的最优水平.

关键词: 分配策略, 正交频分复用, 多用户, 自适应比特分配

Abstract:

The application of adaptive technology to the muhiuser OFDM (Orthogonal Frequency Division Multiplexing)system can increase the spectrum usage,reduce the transmission power of the system and optimize the system performance.In this paper.a mathematical model f0r the adaptive bit and power allocation in the muhiuser OFDM system in frequency selective fading channels is proposed,and a rapid sub-optimal adaptive allocation algorithm is presented.According to the estimation of instantaneous channel characteristics,the adaptive allocation algorithm can assign the subchannels and bits for each user in the system to minimize the total transmission power with a given bit error rate.Simulated results show that the proposed algorithm is simple in calculation,high in eficiency and optimal in theory as the optimal scheme.

Key words: allocation strategy , orthogonal frequency division multiplexing, muhiuser, adaptive bit allocation