en Ps and Pr. Figure 4.3 illustrates the outage performance in both schemes with perfect SIC, i.e. no EP in SIC, as a function of the AP transmit SNR in dB. The predefined minimum data rates R1 and R2 are both set to 0.5 bps/Hz. Besides, as = 0.2 and Bs = 0.8 are constraints. Apparently, optimizing as and Bs based on channel condition and transmit SNR will further improve the outage probability performance, and this can be explored in the future work. It is observed that all the outage probabilities decrease with the increment of SNR. The analytical results match the simulation results very well, which validates the earlier analysis in Theorem 4.1 and Theorem 4.2. Because of this, we only present the analytical results for better illustrations in the figures for the following parts. Further, by comparing the performance of NOMA cooperative and NOMA TDMA schemes, one can conclude that NOMA cooperative scheme achieves lower outage probabilities than the NOMA TDMA scheme, which uses three time slots in one round communication, and hence the added factor decreases the total sum rate. In both schemes, user 1 outperforms user 2 since user 2's message X2 is decoded first, which has a higher interference term. Figure 4.4 presents the result for Theorem 4.3. A new set of parameters is selected to satisfy Remark 4.1 and Remark 4.2. The corresponding parameters are as = 0.36, 4 NOMA in Relay and loT for 5G Wireless Networks p out1 w/o EP--ana p out2 w/o EP--ana p out1 w/EP--ana(0 = 0.7) p out2 w/EP--ana(0 = 0.7) p out1 w/EP--ana(0 = 0.9) p out2 w/EP--ana(0 = 0.9) Transmission SNR of the AP in dB Figure 4.4 Theorem 4.3. as = 0.36, Bs = 0.64. R1 = R2 = 0.4 bps/Hz. 0 = 0.7 and 0 = 0.9. Bs = 0.64, R1 = R2 = 0.4 bps/Hz. The curve without EP is also plotted for reference. One can see that SIC EP degrades the outage performance largely when 0 = 0.7. However, when O = 0.9, the condition Bs is not satisfied any more, making both the analytical and simulated outage probabilities to 1. The result for Theorem 4.4 is shown in Figure 4.5