**6. Conclusions**

Performance analysis of the proposed TH hybrid FSO/mmW system for macrocell BS to small cell BS backhaul communication has been carried out in this chapter. The FSO link turbulence conditions ranging from weak to strong are modeled by using Gamma-Gamma distribution. Further, mmW channel is modeled by using Nakagami-m distribution with m = 5. Outage probability and ABER of the TH scenario have been analyzed for different values of α, β over Gamma-Gamma distribution and average SNR of mmW links. From the results, it is concluded that TH hybrid FSO/mmW system has improved outage and ABER performance when compared to FSO-TH system.
