一种改进的认知无线网络功率控制博弈算法

针对认知无线网络的特点,设计了一种基于信干比的新效用函数,其优点是无须考虑用户无线接入技术的调制方式,且具有边际效用递减的特性。另外,在传统代价函数中引入了动态调整机制。在此效用函数的基础上,提出了基于动态代价的非合作功率控制博弈算法,分析了算法纳什均衡解的存在性和唯一性。仿真实验表明,新算法与经典算法相比,能够明显改善系统性能。最后,比较和分析了在不同用户数下新算法的性能表现。

Improved Power Control Game Algorithm in Cognitive Wireless Networks

Considering characteristics of cognitive wireless network,a new utility function based on signal to interfe-rence ratio was designed.It is not necessary to consider modulation mode of user wireless access technology and has the characteristic of diminishing marginal utility,while the cost function uses the dynamic mechanism.Based on this utility function,a novel non-cooperative power control game algorithm was proposed.It is proved that the Nash equilibrium of the new algorithm is existent and unique.The simulation experiments show that the proposed algorithm,compared with classical algorithm,can significantly improve system performance.In addition,its performances under the different user numbers’ situations were discussed and analyzed.