ROC curve in cognitive radio network

Hello sir/madam, I am doing my project on malicious user detection in cognitive radio network.I have chosen the primary user(PU) signal as BPSK modulated signal and 20 secondary users sensing its energy through energy detection.i used various outlier's test to detect the malicious user.Now, i need to plot the ROC curve to compare the performance of various outlier's test.I have no idea regarding this Pd vs Pf curve.Please help .

thanks in advance

[suchismita]

Pd is probability of detection and pf is probability of false alarm. we calculate probability of detection under the condition when PU signal is present and SU's final result is same too but probability of false alarm is when PU signal is absent and due to interference, fading and malicious users the result gets falsified. Therefore, the SUs final result becomes absent. So, once we get Pd and Pf count for an observation, we plot that.

Hope this explaination will help you.

[swathi]

hello sir/madam,can u please help me how to find the optimal number of secondary users that can be used for sensing so that the sensing overhead is reduced and throughput is maximised.

[sanam gupta]

can anyone tell me how to calculate n samples in n ratio logic spectrum sensing in cognitive radio..