| 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。 |
| 关键词: 认知无线电 频谱感知 分形盒维数 双门限 |
| DOI： |
|
| 基金项目: |
|
| Double Threshold Cooperative Spectrum Sensing Method Based on Fractal Box Dimension |
| CHEN Xiao-bo,CHEN Hong,CAI Xiao-xia,JIANG Jin-bo,ZHU Hua-zhen |
| (Department of Information,PLA Electronic Engineering Institute, Hefei 230037,Ch
ina) |
| Abstract: |
| 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, multiuser 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. |
| Key words: cognitive radio(CR) spectrum sensing fractal box dimension double threshold |
《电讯技术》编辑部 