Figure 5
From: Higher-Order Cyclostationarity Detection for Spectrum Sensing
Energy, second-order and fourth-order detector probability of missed detection (the solid lines) for a fixed probability of false alarm (the points at 
). The system parameters are: baseband QPSK signal with 
MHz symbol frequency, 
MHz sample frequency, square-root Nyquist pulse shaping filter of 
roll-off factor. No noise uncertainty added. The second-order detector is set to detect the symbol-rate feature (cf = 20 MHz), and the fourth-order detector works with the feature at four-times the carrier frequency, which is equal to zero in the present situation (cf = 0 MHz).Two observation times are considered for the three detectors: 50 and 500 
s. An observation time of 10 ms has been added for the fourth-order detector