摘要
在信号分形盒维数特征的基础上,提出利用噪声与授权信号分形盒维数的差异对授权用户是否存在进行检测。为了使合作感知性能趋于更优,多用户采用双门限策略进行分步合作。该方法运算复杂度低,对噪声不敏感。仿真结果表明,双门限合作相比单门限分形盒维数检测和能量检测,系统检测率更高,所需频谱感知时长较短,同时减轻了融合控制中心以及传输信道的负荷。
Based on fmctal box dimension feature of signals, this paper presents a spectrum sensing method em- ploying the difference of fractal box dimension between noise and licensed signals. To achieve a better performance of spectnnn sensing, multi-user takes double threshold cooperative strategy step by step. The method has low com- putational complexity and is not sensitive to the noise. Simulation results show that double thr^hold method per- forms better than single threshold method and energy sensing with higher detection probability and less spectrum sensing time. Meanwhile, the method reduces the burden of central controller and transmission channel.
出处
《电讯技术》
北大核心
2011年第8期75-79,共5页
Telecommunication Engineering
关键词
认知无线电
频谱感知
分形盒维数
双门限
cognitive radio（CR）
spectrum sensing
fractal box dimension
double threshold
