Figure 3
From: Higher-Order Cyclostationarity Detection for Spectrum Sensing
Fourth-order RD-CTCF of a 4-QAM baseband signal as a function of the lag parameters 
and 
for the cycle frequency 
. The values of 
and 
have been fixed to 
and 
respectively. The system parameters are: 
MHz symbol frequency, 
MHz sample frequency, normalized square-root Nyquist pulse shaping filter of 
roll-off factor.