Fig. 2From: Primary user emulation and jamming attack detection in cognitive radio via sparse codingThe averages of {r}2 versus sparse coding iteration for received signals under hypotheses \(\mathcal {H}_{0}\), \(\mathcal {H}_{1}\), \(\mathcal {H}_{2}\), and \(\mathcal {H}_{3}\) are in (a), (b), (c), and (d), respectively, while the averages of |G| versus sparse coding iteration are presented in (e), (f), (g), and (h), respectivelyBack to article page