Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (9): 25-29,51.doi: 10.3969/j.issn.1000-565X.2010.09.005

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Computation Algorithm of Transmission Rate of Cognitive Radio Based on Water-Level Adjustment

Liu Yu-tao  Tan Xue-zhi  Liu Shuai   

  1. Communication Research Center,Harbin Institute of Technology,Harbin 150080,Heilongjiang,China
  • Received:2009-10-23 Revised:2010-04-07 Online:2010-09-25 Published:2010-09-25
  • Contact: 刘玉涛（1981-），男，博士，主要从事认知无线电研究． E-mail:abcqly@gmail．com
  • About author:刘玉涛（1981-），男，博士，主要从事认知无线电研究．
  • Supported by:

    基金资助:国家“863”计划项目（2008AA12Z305）; 国家自然科学基金委员会与中国民用航空局联合资助项目（61071104）

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Abstract:

By means of the wireless transmission model of Rayleigh fading,people often use the utility function of cognitive users to solve the problem of channel programming in cognitive radio networks and to further obtain the transmission rate.As the final communication utility only relates to the water-level when both the total transmission power and the bit error rate（BER） of cognitive users are constrained,a algorithm of power allocation based on water-level adjustment is proposed,through which power and subcarriers can be assigned reasonably and the transmission rate can be finally obtained.Theoretical and simulative results show that the proposed algorithm is of low computation complexity and high utility close to that of the optimal algorithm,and that the adjustment factor only relates to the convergence rate of the algorithm,but not to the total utility and channel allocation results of cognitive users.

Key words: cognitive radio, utility function, water-level adjustment, channel allocation, algorithm complexity