基于多子带信号采样和小波变换的宽带频谱感知

摘要

基于调制宽带转换系统(MWC),提出一种基于多子带信号采样和小波变换的宽带频谱感知方法.首先利用MWC实现宽带信号的低速率采样,得到子带信号;然后提出一种噪声功率及检测门限估计方法,再利用能量检测法实现对非噪声子带的频谱感知;最后利用小波变换对信号子带进行频谱边缘检测,以确定主用户信号占用频段的确切位置信息.仿真结果验证了所提出的宽带频谱感知方法的可行性和有效性.%Based on with MWC, this paper proposed a wideband spectrum sensing approach based on multiband signal sampling and wavelet transform.Firstly obtained sub-bands signals by low rate sampling, and then, proposed an estimation method for noise power and threshold, such that the spectrum sensing for signal sub-bands could be carried out by energy detection, at last, used the edge detection for signal sub-bands by using wavelet transform to obtain the exact locations of spectrum occupied by primary users.Simulation results show that the proposed wideband spectrum sensing approach is feasible and effective.