一种改进的基于博弈论的动态频谱共享算法  

An Improved Dynamic Spectrum Sharing Scheme Based on Game Theory

作　　者：周惟风[1] 朱琦[1,2] 

机构地区：[1]南京邮电大学江苏省无线通信重点实验室,江苏南京210003 [2]南京邮电大学教育部宽带无线通信与传感网技术重点实验室,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2011年第3期6-13,共8页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)(2007CB310607);国家自然科学基金(60772062);国家科技重大专项(2011ZX03001-006-02;2011ZX03005-004-03)资助项目

摘　　要：针对基于博弈论的主次用户共享频谱问题,提出了改进的次用户博弈效用函数,该函数中的频谱需求度参数不仅考虑了次用户因为业务不同而导致对频谱需求不同这一因素,而且还考虑了可以共享到的频谱数量对需求的影响,次用户共享的频谱越多,则对频谱的需求度会相对降低。文中提出的效用函数中的需求度是共享频谱的函数,是一个变量,它更加准确地描述了认知无线电系统中次用户对频谱需求的特性,可以更好地体现频谱分配的公平性。分析了频谱需求度函数对博弈频谱共享算法的影响,通过理论分析和仿真证明了所提出算法的正确性,并且存在纳什均衡。Aimed at the problem of spectrum sharing among a primary user and multiple secondary users based on Game Theory,an improved utility function of the second user is proposed.Not only the different spectrum requirements as a result of the different service among second users,but also the influence of the shared spectrum on the spectrum demand have been taken into consideration in the spectrum demand parameter of the function.The more spectrum the second user shared,the demand for spectrum will be relatively less severe.The demand degree in the utility function is a function of spectrum sharing.It is a variable which can more accurately describes the cognitive radio system features in meeting the needs of users of the spectrum,and reflect better the spectrum allocation of the equity.This paper also analyzed the impact of the spectrum demand function on the spectrum sharing algorithm based on game theory.The theoretical analysis and simulation demonstrate the validity of the proposed algorithm and the existence of Nash equilibrium.

关 键 词：认知无线电 频谱共享 博弈论 需求因子 纳什均衡 

分 类 号：TN911[电子电信—通信与信息系统] TN929.5[电子电信—信息与通信工程]