中文说明：这段代码执行宽带频谱检测各种噪音水平下。考虑大量的初级用户以及二级用户。检测是基于功率谱密度。这个项目给出了下限 PU 信号的功率水平这样正确检测是可能。
English Description：
This code performs wide band cooperative spectrum sensing under various noise levels. A large number of primary users as well as secondary users are considered.The detection is power spectral density based . This project gives the lower bound for the power level of the PU signals such that correct detection is possible.