Ergodic Capacity Analysis of Satellite Communication Systems With SAG-FSO/SH-FSO/RF Transmission

Future non-terrestrial networks aim to achieve a throughput of Terabits/s. Therefore, free-space optical (FSO) communications have been adopted as a candidate solution due to their ability to achieve an extremely high data rate. Nonetheless, FSO communications are sensitive to the adverse effects of...

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Bibliographic Details
Published in:IEEE photonics journal 2022-10, Vol.14 (5), p.1-9
Main Authors: Samy, Ramy, Yang, Hong-Chuan, Rakia, Tamer, Alouini, Mohamed-Slim
Format: Article
Language:English
Subjects:
Communications systems
Ergodic capacity
Ergodic processes
Fading channels
Free-space optical communication
free-space optics
high-altitude platforms
hybrid FSO/RF systems
Optical transmitters
Radio frequency
Relays
Reliability
Rician channels
satellite communication
Satellite communications
Satellites
Signal to noise ratio
space-air-ground networks
Weather
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Summary:Future non-terrestrial networks aim to achieve a throughput of Terabits/s. Therefore, free-space optical (FSO) communications have been adopted as a candidate solution due to their ability to achieve an extremely high data rate. Nonetheless, FSO communications are sensitive to the adverse effects of beam scintillation, beam-wander-induced pointing errors, free-space loss, and weather conditions. Space-air-ground (SAG) FSO transmission and hybrid single-hop (SH) FSO/radio frequency (RF) transmission are promising solutions to improve the performance of FSO links and can be integrated into a satellite communication (Satcom) system. In this work, we carry out a thorough capacity analysis of the resulting integrated SAG-FSO/SH-FSO/RF Satcom system, where Gamma-Gamma and Rician distributions are used to characterize FSO and RF links, respectively. The exact analytical expressions are derived and validated by Monte-Carlo simulations. We also obtain asymptotic expressions for the ergodic capacity in the high signal-to-noise ratio region. The numerical results highlight the significant potential of the integrated SAG-FSO/SH-FSO/RF Satcom system over existing solutions. We also show that the integrated Satcom system with intensity modulation and direct detection can achieve a capacity gain over that with a heterodyne detection technique over all satellite zenith angles.
ISSN:1943-0655
1943-0655
1943-0647
DOI:10.1109/JPHOT.2022.3201046