华南理工大学学报(自然科学版) ›› 2011, Vol. 39 ›› Issue (5): 18-23.doi: 10.3969/j.issn.1000-565X.2011.05.004

• 电子、通信与自动控制 • 上一篇    下一篇

一种认知无线电系统中最优的功率分配算法

张国斌 冯穗力 柯峰   

  1. 华南理工大学 电子与信息学院,广东 广州 51064
  • 收稿日期:2010-09-15 修回日期:2011-01-05 出版日期:2011-05-25 发布日期:2011-04-01
  • 通信作者: 张国斌(1980-),女,博士生,主要从事宽带无线通信系统的信号处理与应用研究 E-mail:zhang.gb@mail.scut.edu.cn
  • 作者简介:张国斌(1980-),女,博士生,主要从事宽带无线通信系统的信号处理与应用研究
  • 基金资助:

    国家自然科学基金资助项目(61001113);华南理工大学中央高校基本科研业务费资助项目(2009ZM0071);粤港关键领域重点突破项目(20060104-2)

Optimal Power Allocation Algorithm for Cognitive Radio Networks

Zhang Guo-bin  Feng Sui-li  Ke Feng   

  1. School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2010-09-15 Revised:2011-01-05 Online:2011-05-25 Published:2011-04-01
  • Contact: 张国斌(1980-),女,博士生,主要从事宽带无线通信系统的信号处理与应用研究 E-mail:zhang.gb@mail.scut.edu.cn
  • About author:张国斌(1980-),女,博士生,主要从事宽带无线通信系统的信号处理与应用研究
  • Supported by:

    国家自然科学基金资助项目(61001113);华南理工大学中央高校基本科研业务费资助项目(2009ZM0071);粤港关键领域重点突破项目(20060104-2)

摘要:

为满足干扰温度和总发送功率限制,并最大化用户的传输速率,提出一种上行认知无线电正交频分复用(OFDM)系统的最优功率分配算法。该算法首先在认知用户总功率限制下使用置零迭代注水算法进行功率分配,然后将超过干扰功率限的子载波功率调整为干扰功率限,将剩余功率在剩余子载波上重新进行迭代注水分配,直至获得最优功率分配。数学推导证明该算法具有最优性,仿真结果验证了该结论,同时表明该算法在所需迭代次数最多的情况下计算量仍比梯度方法减少50%以上。

关键词: 认知无线电, 干扰温度, 功率分配, 注水算法

Abstract:

In order to satisfy the limitation of interference temperature and total transmission power and to maximizeusers' transmission rate,an optimal power allocation algorithm adaptive to uplink cognitive radio OFDM ( OrthogonalFrequency Division Multiplexing) system is proposed. In this algorithm,first,the zero-setting iterative waterfillingalgorithm under the constraints of total power of the cognitive user is applied to the power allocation. Then,the subcarrier power exceeding the interference power limit is set as the new interference power limit. Finally,theresidual power is allocated to the residual subcarriers by the iterative water-filling algorithm until the optimal powerallocation is achieved. Both the mathematical derivation and the simulation results prove that its proposed algorithmis optimal,and that its computation amount reduces by over 50%,as compared with the gradient method even atthe highest iterative times.

Key words: cognitive radio, power allocation, interference temperature, water-filling algorithm