# Analytical Framework of CP-Free Multiuser OFDM System for Coordinated Multi-Point at mmWave
## 3 Simulation Results
\begin{table}
\begin{tabular}{l l} \hline \hline
**Description** & **Value** \\ \hline Average Transmit power of BS 1 & 5000 W (66.9897 dBm) \\ Average Transmit power of BS 2 & 5000 W (66.9897 dBm) \\ Original signal power and interference signal power of user 1 & 7.7329 \(\times\) 10\({}^{-11}\) W and 2.4999 \(\times\) 10\({}^{-41}\) W \\ Original signal power and interference signal power of user 2 & 5.7999 \(\times\) 10\({}^{-4}\) W and 1.8913 \(\times\) 10\({}^{-34}\) W \\ Original signal power and interference signal power of user 3 & 4.8633 \(\times\) 10\({}^{-4}\) W and 2.0287 \(\times\) 10\({}^{-34}\) W \\ Original signal power and interference signal power of user 4 & 8.0893 \(\times\) 10\({}^{-5}\) W and 2.0519 \(\times\) 10\({}^{-34}\) W \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Estimated signal power at both the BS and user end. Figure 5: BER performance of the considered system with utilization of various channel coding, higher\(-\)order digital modulation, and ZF signal detection technique for user 1. Figure 7 is for user 3 and in such case, the system provides significant BER performance compared with other implemented channel coding techniques. The evaluated values representing BER are 0.1153, 0.0001, and 0.4146 in the cases of (3,2) SPA, RA, and the Quasi LDPC channel coding techniques under 16-QAM, respectively, at a customarily accepted SNR value of \(-6\) dB, which signifies the improvement in system performance by 30.618 dB and 36.176 dB in RA compared with (3,2) SPA and Quasi LDPC channel coding techniques. In the case of 16-PSK, overall system performance utilizing the RA channel coding technique provides better BER performance compared with the other two techniques. Over a significant range of higher SNR values, the system performance with (3,2) SPA and RA channel coding techniques are not well discriminated. At a customarily accepted SNR value of \(-5\) dB, the evaluated values representing BER are 0.1716, 0.1597, and 0.3687 for the cases of (3,2) SPA, RA, and Quasi LDPC channel coding techniques, respectively, which confirm an insignificant improvement of 0.312 dB and significant improvement of 3.634 dB in RA compared with (3,2) SPA and Quasi LDPC channel coding techniques. Figure 8 presents characteristic features of the system for user 4. As the transmitter-receiver distance from BS 1 in the case of user 4 is comparatively higher, the signal attenuation in mmWave transmission has an impact on BER performance. With the SNR value observed earlier, the estimated values representing BER under 16-QAM are 0.0679, 0.0083, and 0.4640 for (3,2) SPA, RA, and Quasi LDPC channel coding techniques, respectively. For this case, improvement in the performance of the system by 9.128 dB and  
Figure 6: BER performance of the considered system with the utilization of various channel coding, higher\(-\)order digital modulation, and ZF signal detection techniques for user 2. Figure 7: BER performance of the considered system with utilization of various channel coding, higher\(-\)order digital modulation, and ZF signal detection techniques for user 3. 17.474 dB are achieved in RA compared with (3,2) SPA and Quasi LDPC channel coding techniques. In the case of 16-PSK with an identical SNR value (\(-\)5 dB), the evaluated values corresponding to BER are 0.1194, 0.0730, and 0.3603 for (3,2) SPA, RA, and Quasi LDPC channel coding techniques, respectively, which confirm an improvement in system performance by 2.137 dB and 6.933 dB in RA compared with (3,2) SPA and Quasi LDPC channel coding techniques. It is observable from Figure 9 that under a scenario of transmitted power from a single BS, the estimated average minimum and maximum SINR values for user 1 through user 4 are 7.5464 dB and 17.5464 dB, 8.4224 dB and 18.4224 dB, \(-\)1.4506 dB and 8.5494 dB, and \(-\)3.5121 dB and 6.4879 dB, respectively.