Research Article
Secure Information Transmissions in Wireless-Powered Cognitive Radio Networks for Internet of Medical Things
Figure 4
The secrecy rate of the primary system with respect to the distance between the PT and ST. PP = 10 dB, PST0 = 0 dB, dSS = 2 m, dSPR = dPP-dPST, dSME = dSPR, dPME = dPP. The antenna number N = 4.