Research Of Power Control Algorithm Over Game Theory In Cognitive Radio

As the development of technology ,the spectrum resource is becoming more and more preciousfor the tremendous demand of wireless equipments.Current wireless networks are based on a staticspectrum allocation policy.However the static policy was the key reason of the low spectrum utilityrate .For make the change, the cognitive radio came into being.Cognitive radio would realize spectrum sharing between licensed user and cognitiveuser.While the cognitive users use the free spectrum, it must be ensure that the licensed user wouldnot be interfered.Consequently,it is so important to introduce strict power control technology tocognitive radio.Currently game theory became a key tool to solve the power control issue incognitive radio.The power control algorithm based on game theory consider the power control issueas a non-cooperative game.The algorithm is implemented by game model.The game model containsutility function and pricing function.The utility function is which the user try to get themaximum,and the pricing function is use to punish the greedy user. This paper study the powercontrol algorithm base game theory.This paper briefly depicts the architecture and key technology of cognitive radio,introduces thebasic concept of game theory ,explains how to use game theory to solve the power control issue,andthen introduces the utility function and pricing function and same kinds of non-cooperative gamemodel.Afterwards,this paper presents the iterative algorithm of non-cooperative model,and thenproposed a efficient algorithm.Hereafter,this paper verifies the feasibility of the algorithm,andcompares those game model which had be mentioned.Basing on the analysis and the characteristicof pricing function,this paper proposes a new model which is based on double-pricing.Finally thesimulation results show that new model have an advantage over other model in the power controland also improve the fairness and global utility.