Fig. 7

CSS detection probabilities with a Max–Min ED, b Max/Min ED and c Diff. Max–Min ED and three different linear fusion rules for non-oversampled QPSK PU signal under Indoor channel and log-normal fading (\(\sigma =9\,\hbox {dB}\)), the length of \(N_{FFT} = 8\), the number of sensing stations M = 8, the sample complexity N = 10,240, and 1 dB NU