Adaptive-Combining-Based Hybrid FSO/RF Satellite Communication With and Without HAPS

In recent years, a growing interest has been witnessed in the usage of free space optics (FSO) link for satellite communication (SATCOM) scenarios, as it offers much higher data rates up to gigabits per second (Gbps) compared existing radio frequency (RF) link. However, FSO links are sensitive beam scintillation and pointing errors. this paper, we consider hybrid FSO/RF between ground station (GS) satellite, where RF will act backup improve reliability communication. addition, also high-altitude platform (HAPS), which relay station, GS end-to-end system performance. This led development space-air-ground integrated SATCOM networks. We analyse performance proposed network considering an adaptive-combining-based switching scheme both uplink downlink scenarios with without using HAPS station. case scheme, is continuously transmitted over link, while maximal-ratio-combining (MRC) performed when quality deteriorates. The analysis terms outage average symbol error rate (SER) carried out same single-link single-threshold-based literature SATCOM. gain obtained by adaptive combining different channel conditions reported. Further, asymptotic obtain diversity system.