Fig. 10From: On secrecy performance analysis of multi-antenna STAR-RIS-assisted downlink NOMA systemsThe theoretical results of SOP for user \(\textrm{U}_2\) versus \(\lambda _{m,e}\). When the transmission power is constant, The impact of the \(\lambda _{m,e}\) on the SOP for user \(\textrm{U}_2\)Back to article page