# Modeling of NOMA-MIMO-Based Power Domain for 5G Network under Selective Rayleigh Fading Channels
## 5 Results and Discussions
### The Outcomes of the UL Scenario  
The UL NOMA average capacity rate vs. SNR at 80 MHz BW is depicted in Figure 11. The result shows that the average capacity rate for U4 is best for all users because U4 is the closest. At SNR of 1 dB, the average capacity rate for U1, U2, U3, and U4 is found to be 1.6873, 2.8718, 6.4960, and 12.7814, respectively. Figure 12 shows the UL average capacity rate against SNR at 200 MHz BW. At SNR of 1 dB, the average capacity rate for U1, U2, U3, and U4 is found to be 2.6015, 3.9841, 7.7910, and 14.1068, respectively. The results reveal that when an SNR increases, the average capacity rate performance rises as well. The 64 \(\times\) 64 MIMO improved the performance of the capacity average rate by 12 bps/Hz and reduced the OP by 15 \(\times\) 10\({}^{-3}\) for 80 MHz BW at SNR of 1 dB; it enhanced the performance capacity average rate by 12 bps/Hz, and decreased the OP by 12 \(\times\) 10\({}^{-3}\) for 200 MHz BW at 0.17 dB SNR for the user U4. In general, an increase in BW increases the capacity average rate and BER while decreasing OP and SE. MIMO significantly enhances the throughput of all users. Figure 11: Average capacity rate vs. SNR for four users with varying distances and BW 80 MHz for UL NOMA. Figure 10: SE against transmitting power for four users with varying distances, with power coefficients with the 64 \(\times\) 64 MIMO and BW 200 MHz for DL NOMA. The average capacity rate performance for UL NOMA versus SNR at 80 MHz BW and 64 \(\times\) 64 MIMO is obtained in Figure 13. The outcomes were achieved for four users 12.7881, 14.4423, 18.4489, and 24.7815, respectively. Figure 14 shows the average capacity rate performance versus SNR for UL NOMA at 200 MHz BW and 64 \(\times\) 64 MIMO. The results show that the average capacity rate performance improves as the SNR increases. The average capacity rate performance for U4 is the best according to the data obtained for four users 14.1110, 15.7659, 19.7693, and 26.1040 at the SNR of 1 dB. Users' performance has improved considerably. Figure 12: Average capacity rate against SNR for four users with varying distances and BW 200 MHz for UL NOMA. Figure 13: Average capacity rate vs. SNR for four users with varying distances, with 64 \(\times\) 64 MIMO and BW 80 MHz for UL NOMA. The BW and average capacity rate have a positive relationship, with an increase in BW leading to an increase in average capacity rate. The average capacity rate increases dramatically when the system is enhanced using the MIMO scheme. The UL NOMA of OP vs. SNR correlation is shown in Figure 15 at 80 MHz BW. When SNR is 0.17 dB, the results for U1, U2, U3, and U4 are 99.9 \(\times\) 10\({}^{-2}\), 98.9 \(\times\) 10\({}^{-2}\), 44.3 \(\times\) 10\({}^{-2}\), and 15 \(\times\) 10\({}^{-3}\), respectively. Figure 16 depicts the UL NOMA of OP versus the SNR at 200 MHz BW. At an SNR of 0.17 dB, the results for U1, U2, U3, and U4 are 0.9989, 0.9715, 0.3709, and 0.0120, respectively. The findings show that as the SNR improves, the OP performance decreases. Results achieved have an improvement in average capacity rate and are superior to those of the best U2 users in [35]. Figure 14: Average capacity rate against SNR for four users with varying distances, with 64 \(\times\) 64 MIMO and BW 200 MHz for UL NOMA. Figure 15: OP vs. SNR for four users with varying distances and BW 80 MHz for UL NOMA. At 80 MHz BW with 64 \(\times\) 64 MIMO, Figure 17 depicts the UL NOMA of OP vs. SNR. At an SNR of 0.17 dB, the outcomes for U1, U2, U3, and U4 are 0.0053, 0.0027, 0.0003, and 0.0000. At 200 MHz BW and 64 \(\times\) 64 MIMO, Figure 18 depicts the UL NOMA of OP vs. the SNR. At an SNR of 0.17 dB, the results for U1, U2, U3, and U4 are 21 \(\times\) 10\({}^{-4}\), 10\({}^{-4}\), 10\({}^{-4}\), and 10\({}^{-5}\). The data show that when the SNR increases, the performance of the OP decreases [39; 40; 41]. Figure 16: OP against SNR for four users with varying distances and BW 200 MHz for UL NOMA.