# 6G Network Architecture Using FSO-PDM/PV-OCDMA System with Weather Performance Analysis
## 5 Simulation Results
### Effect of Wet and Dry Snow on FSO-PDM/PV-OCDMA System  
Finally, the impact of dry and wet snow on the link performance is studied for all eight channels. The BER versus different number of channels that can be supported by the proposed system under WS and DS at different transmitted power and data rate of 20 Gbps is devoted in Figure 11. As cleared from Figure 11, the system under WS can support larger numbers of channels which are 70 and 21, respectively, at 15 dBm and 10 dBm transmitted power at BER \(10^{-9}\). However, under DS, the proposed model can support lower numbers of channels, which are 30 at 15 dBm transmitted power and 9 at 10 dBm transmitted power.  
Moreover, the system with eight channels carry information is simulated under different snowfall rates to show the effect of the propagation ranges on the information signal. From Figures 12 and 13, the maximum FSO link for eight simulated channels is 1.15 km under WS, which causes attenuation (13.73 dB/km) less than that caused under DS (attenuation is 96.8 dB/km [31]). So, the FSO range for eight channels is decreased to 0.28 km under DS. These ranges are taken at acceptable BER values (less than 2.5 \(\times\) 10\({}^{-3}\)) and Q-factor values approximately 5. The computed log (BER) and the Q-factor for the eight channels at a propagation range of 1.15 km under DS, and 0.28 km under WS are given in Table 6.  
Figure 11: BER of FSO-PDM/PV-OCDMA system versus number of channels under snowy conditions.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multicolumn{1}{c}{**Channels**} & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** \\ \hline \multicolumn{1}{c}{Polarization signal} & \multicolumn{6}{c}{x-polarization} & \multicolumn{6}{c}{y-polarization} \\ Log (BER) & under LD & \(-\)6.74 & \(-\)5.49 & \(-\)6.06 & \(-\)6.56 & \(-\)6.44 & \(-\)5.59 & \(-\)6.66 & \(-\)6.62 \\ Q-factor & (0.775 km) & 5.08 & 4.51 & 4.78 & 5 & 4.95 & 4.56 & 5.05 & 5.03 \\ Log (BER) & under MD & \(-\)6.65 & \(-\)6 & \(-\)6.73 & \(-\)7.02 & \(-\)6.21 & \(-\)5.99 & \(-\)6.88 & \(-\)6.87 \\ Q-factor & (0.26 km) & 5.04 & 4.75 & 5.08 & 5.2 & 4.84 & 7.75 & 5.14 & 5.14 \\ Log (BER) & under HD & \(-\)7.4 & \(-\)5.74 & \(-\)7 & \(-\)7.31 & \(-\)6.95 & \(-\)6.63 & \(-\)7.48 & \(-\)7.1 \\ Q-factor & (0.112 km) & 5.36 & 4.62 & 5.19 & 5.32 & 5.18 & 5.04 & 5.4 & 5.24 \\ \hline \hline \end{tabular}
\end{table}
Table 5: log (BER) values and Q-factors of eight channels of FSO-PDM/PV-OCDMA system under dust storm conditions and propagation ranges.  
A comparison between our work and previously published works is given in Table 7.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Channels** & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** \\ \hline \multicolumn{2}{c}{Polarization signal} & \multicolumn{4}{c}{x-polarization} & \multicolumn{4}{c}{y-polarization} \\ Log (BER) & under WS & \(-\)7.59 & \(-\)6.54 & \(-\)7.9 & \(-\)7.46 & \(-\)7.47 & \(-\)6.91 & \(-\)7.49 & \(-\)7.48 \\ Q-factor & (1.15 km) & 5.44 & 4.99 & 5.57 & 5.39 & 5.4 & 5.16 & 5.4 & 5.4 \\ Log (BER) & under DS & \(-\)7.76 & \(-\)6.35 & \(-\)7.61 & \(-\)7.11 & \(-\)6.79 & \(-\)6.7 & \(-\)7.32 & \(-\)7.36 \\ Q-factor & (0.28 km) & 5.51 & 4.91 & 5.45 & 5.24 & 5.11 & 5.07 & 5.33 & 5.35 \\ \hline \hline \end{tabular}
\end{table}
Table 6: Log (BER) values and Q-factors of eight channels of \(\text{FSO-PDM}/\text{PV-OCDMA}\) system under different snowfall and propagation ranges.  
Figure 12: Log (BER) of \(\text{FSO-PDM}/\text{PV-OCDMA}\) system versus \(\text{FSO link}\) under (**a**) DS, and (**b**) WS.  
Figure 13: Q-factor of \(\text{FSO-PDM}/\text{PV-OCDMA}\) system versus \(\text{FSO link}\) under (**a**) DS, and (**b**) WS.