[Discuss-gnuradio] how to Sense the spectrum bycomparing calculated energy with threshold

[Omer Omer]

hi,i am working on the project spectrum sensing by using energy detection. first i insert a block of usrp then i insert the block of stream to vector ,then i have taken fft of that and then i have taken the magnitude square block.i yhs way i calaculte energy.now i have to compare this energy with predetermined threshold.so what is easier way to compare energy with threshold in order to sense the spectrum