Since our main focus is on the low SNR region, another possible ways of maximizing the probability of detection of the ROC curve and detection performance is by increasing the number of CR users and the number of samples.

As shown in Fig. 3, a comparison between the ROC of the proposed method and MCS method in [3] specifies that the proposed method in low SNR region shows improvement for detection probability, and the 34% improvement in detection probability is observable compared to the MCS method.