基于双门限盒维数与信息维数的协作感知方法

Cooperative Spectrum Sensing Based on Double Threshold Box Dimension and Information Dimension

由于认知超宽带系统在频带范围内授权信号调制样式已知,考虑到传统循环谱特征检测的不足,提出一种结合双门限盒维数与信息维数的协作频谱感知方法。该方法首先通过采用双门限盒维数检测,快速有效地实现频谱感知,然后,根据认知超宽带频谱感知的特殊性,引入信息维数对信号调制样式进行识别。仿真结果表明:该协作方法能够取得较好的检测效果,复杂度低,对噪声不敏感,能够有效识别信号调制样式、区分噪声与授权信号,适合于认知超宽带系统。

Since modulation mode of licensed signal are known in cognitive ultra-wideband（CUWB） system,considering the shortcomings of traditional cyclostationary feature detection,this paper proposed a spectrum sensing method combing the double threshold box dimension and information dimension cooperatively.Through adopting double threshold of noise box dimension detection at first,the method was able to realize spectrum sensing faster and more effectively.Then,regarding the particularities of spectrum sensing in CUWB system,the information dimension was taken to recognize signal modulation mode in this method.Simulation results showed that the method had a better sensing performance with low computational complexity and not sensitive to the noise,it was able to recognize signal modulation mode effectively and distinguish noise and licensed signals.