부산대학교 도서관

The hybrid radio frequency/free space optics (RF/FSO) architecture is a highly effective method for combining the advantages of RF and FSO technologies. This approach is especially beneficial in space communications, where neither technology alone can meet the high data rate and reliability requirements. By integrating RF and FSO technologies, the hybrid architecture offers a reliable and high-speed solution for space and High-Altitude Platforms (HAP)-based terrestrial communication systems. With this hybrid approach, the strengths of each technology complement each other, resulting in improved data transmission and enhanced reliability in such systems. One of the challenges of using the hybrid approach is the switching mechanism, where the system must seamlessly switch between RF and FSO links without interrupting the data transfer. In order to tackle this challenge, this paper presents a method that considers the relationship between the switching threshold and the level crossing rate associated with atmospheric turbulence-induced fading in FSO communication channels. The simulation results demonstrate that the best outage performance is achieved by setting the switching threshold at a point where a high level crossing rate occurs.