基于分形盒维数的双门限合作频谱感知方法

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。

Double Threshold Cooperative Spectrum Sensing Method Based on Fractal Box Dimension

Based on fractal box dimension feature of signals, this paper presents a spectrum sensing method employing the difference of fractal box dimension be tween noise and licensed signals. To achieve a better performance of spectrum s ensing, multi user takes double threshold cooperative strategy step by step. T he method has low computational complexity and is not sensitive to the noise. Simulation results show that double threshold method performs better than singl e threshold method and energy sensing with higher detection probability and less spectrum sensing time.Meanwhile, the method reduces the burden of central cont roller and transmission channel.