Performance Analysis of Adaptive Combining Based Hybrid FSO/RF Communication System with Pointing Errors Over F-Distribution/ Nakagami-m Channel Models

The usage of Free Space Optical (FSO) communication offers enormous promise as a technology capable of offering high-speed data transfer, reusability, and built-in security. However, FSO lines are sensitive to atmospheric attenuation, which may significantly effect the quality and reliability of the signal transmission. To solve these problems, researchers have suggested hybrid FSO/radio frequency (RF) systems that leverage both connections to increase the overall dependability of the communication system. This research offers a unique hybrid FSO/RF system that combines adaptive combining switching technique for the IM/DD and coherent heterodyne detection. In the modeling of communication connections, the Fisher distribution is utilised for FSO links, whereas the Nakagami-m distribution is utilized for RF lines. The mathematical framework of the cumulative distribution function (CDF) and probability density function (PDF) is constructed for the instantaneous overall received electrical signal-to-noise ratio (SNR). These formulae are then utilized to construct the closed form formulations for the outage probability (OP). The results suggest that hybrid FSO/RF systems provide a notable boost in the reliability and accessibility of FSO communication.