基于二阶循环累积量的多载波信号频谱检测

针对认知无线电系统中多载波信号OFDM/OQAM进行循环谱特征检测预处理要求严格的问题,提出一种以二阶循环累积量的循环频率为特征,结合循环平稳性检测的频谱感知改进算法.算法无需各种参数估计以及同步等预处理过程,理论推导及仿真结果证明,该算法能够实现低信噪比下主用户信号的有效感知,且相比于能量检测法能达到更好的检测性能.

Spectrum Sensing of Multi-Carrier Signals Based on Cyclostationarity

Aiming at the requirements of strict preprocessing for multiearrier signals in cyclostationarity spectral feature detection, a new sensing method is proposed based on the signal cyclic frequency fea- tures of second-order cyclic cumulants with cyclostationary test. Estimation of parameters and synchro- nization are not required as preprocessing tasks in this method. The theoretical derivations and simu- lations simultaneously show the proposed method has effective performance of primary user detection and outperforms the energy detection method in low SNR.