Fig. 6From: Green communication for MIMO SWIPT-powered 5G Internet of Things with full-duplex relay base on secure transmission and energy collection constraintsThe transmitting power achieved by the three optimization schemes. The black histogram represents the transmitting power achieved by MSED, which is the scheme proposed in reference 18; the red histogram represents the transmitting power achieved by MHED which is the scheme proposed in reference 19; the blue histogram represents the transmitting power achieved by SPSD the optimization scheme proposed by this paperBack to article page