认知无线电中基于时间差因子的频谱分配算法  

Spectrum allocation algorithm based on time difference factor in cognitive radio

作　　者：文凯[1,2] 傅小玲[2] 付玲生[2] 

机构地区：[1]重庆邮电大学重庆信科设计有限公司,重庆400065 [2]重庆邮电大学通信新技术应用研究所,重庆400065

出　　处：《计算机应用》2011年第5期1173-1175,共3页journal of Computer Applications

摘　　要：为了降低认知系统的通信中断概率,提高认知系统的稳定性,在经典的图论着色模型基础上提出了一种改进的频谱分配算法。该改进算法引入一个频谱空闲时间和用户请求时间的差值因子,对于每个认知用户,该算法综合考虑频谱效益与时间差因子两个因素来分配频谱。仿真结果表明,改进算法使认知系统的中断概率远低于原算法。In order to reduce the outage probability and enhance the stability of cognitive system,an improved algorithm of spectrum allocation based on classical graph coloring model was proposed.A difference factor of spectrum＇s idle time and user＇s request time was introduced.For every cognitive user,the algorithm allocated spectrums according to two factors： the spectrum efficiency and the time difference factor.Cognitive user with greater product value of the two factors was prior.The simulation results show that the outage probability of improved algorithm is far below that of the previous algorithm.

关 键 词：认知无线电 频谱分配 图论着色模型 中断概率 

分 类 号：TN929.5[电子电信—通信与信息系统] TP391.9[电子电信—信息与通信工程]