Optimum Power Allocation Based on Channel Conditions in Optical Satellite Downlinks
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Optimum Power Allocation Based on Channel Conditions in Optical Satellite Downlinks Theodore T. Kapsis1 · Athanasios D. Panagopoulos1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The integration of optical satellite links in the next-generation networks and in the fifth generation cellular systems has been proposed in order to guarantee the handling of the extreme data traffic growth and the high-pitched demand for networks’ resources. The optical satellite communication downlink is studied and more specifically, a geostationary satellite with multiple transmitters and an optical ground station with multiple receiving terminals are considered. In this contribution a novel power allocation methodology is proposed for the downlink. The allocation methodology takes into account the scintillation effects due to atmospheric turbulence and maximizes the ergodic network capacity under total expected power and peak power constraints. The analytical optimizing schemes are based on convex optimization methods and have been inspired by waterfilling algorithm. We present emulated power allocation results using real experimental downlink data from ARTEMIS optical satellite campaign and then we investigate the performance of the proposed algorithm with extended numerical results and comparison with other allocation policies. In particular, the new power allocation strategy achieves the highest spectral efficiency, according to the power constraints, for various channel conditions and attenuation profiles and also surpasses two simple baseband allocation methods by intelligently taking advantage of the number of channels and the total expected power. Keywords 5G optical satellite · Backhauling · Parallel MIMO · Downlink scintillation · Power allocation · ARTEMIS
1 Introduction The satellite communications industry is seeking innovative and efficient solutions to conform to the high demanding standards introduced by the upcoming 5G mobile networks. The applications of satellite networks vary greatly from providing remote connections in * Athanasios D. Panagopoulos [email protected] Theodore T. Kapsis [email protected] 1
School of Electrical and Computer Engineering, National Technical University of Athens, Iroon Polytecchniou 9, 15780 Athens‑Zografou, Greece
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disaster events and anyplace on earth, sea and air e.g. trains, ships, aircrafts to assisting the current terrestrial networks [1, 2]. Especially, relay services i.e. earth observation and deep space missions as well as backhaul services from/to cell towers through satellite Internet gateways are some of the various use cases of 5G satellite communication links [1–3]. Additionally, mmWave frequencies (Q/V bands) may also be utilized for uplinks to release other useful spectrum and diverse satellite systems consisting of both GEO and LEO can be employed to combine wide coverage with minimal latency [1, 2]. The optical technology is undoubtedly the dominant and the most
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