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Energy-efficient Link Resource Allocation In The Multibeam Satellite Downlink Under QoS Constraints

R. Andreotti, F. Giannetti, M. Luise
Published 2016 · Computer Science

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This work deals with the issue of boosting the capacity of xDSL networks in the presence of geographical gaps. To this aim, an effective approach consists in exploiting the downlink of multibeam satellites for the delivering of packed-based traffic, employing modulation and coding schemes denoted by very high spectral efficiency, such as in DVB-S2X standard. Though, time-varying channel and interference may severely affect the quality of the communication. To cope with these issues, this paper proposes a novel link resource adaptation based on the following features. First, to efficiently manage packet-based transmissions, an adaptive coding and modulation (ACM) scheme is derived aimed at maximizing the “goodput” (GP), i.e., the offered layer-3 data rate. Then, in order to mitigate the co-channel interference arising from beams exploiting the same band, an adaptive power control (PC) is also proposed. The goal of the latter is to maximize the energy-efficiency of the satellite downlink guaranteeing a given quality-of-service, i.e., a minimum-GP, over each link. This problem is modeled as a non-cooperative game and the conditions of feasibility, existence and uniqueness of the solution are analytically derived. Finally, simulation results are provided comparing the proposed strategy with the conventional rate satisfaction PC approach. Copyright c ⃝ 2015 John Wiley & Sons, Ltd.
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