Optical wireless communication, or free space optics, is a promising solution for backhauls in sixth-generation mobile systems. However, the susceptibility of optical links to weather conditions has led to FSO links being furnished with radio frequency (RF) backups. These Hybrid FSO/RF systems provide enhanced link availability but lead to RF resource wastage. Cognitive radio technology, in contrast, is well known for its optimal use of RF resources and may be combined with an FSO link to create a Cognitive Hybrid FSO/RF system. This work uses such a system to analyze a configuration for a mobile backhaul in sixth-generation mobile systems. This configuration can seamlessly coexist with established large scale RF cellular networks. The performance of this configuration is analyzed with respect to outage probability and average bit error by considering the impact of optical channel turbulence, misalignment loss, RF interference, and noise. Mathematical closed-form expressions are verified by simulations.
The proposed system design presents a novel configuration that is created by the integration of several standalone free space optical (FSO) links, a hybrid FSO/RF and some cognitive or pseudo hybrid links. The objective is to allow different quality-of-service (QoS) links within a system as a whole. In addition to individual QoS requirements, a constraint on the overall system QoS, in the form of minimum system outage, is also ensured. The design methodology aims at identifying the optimal number of standalone FSOs and cognitive hybrid links which can be supported by a single hybrid FSO/RF link. Atmospheric turbulence and pointing errors are considered for the analysis. Simulation results are used to corroborate the analytical findings.
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