Linear and nonlinear techniques for multibeam joint processing in satellite communications
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RESEARCH
Open Access
Linear and nonlinear techniques for multibeam joint processing in satellite communications Dimitrios Christopoulos1*, Symeon Chatzinotas1, Gan Zheng1, Joël Grotz2 and Björn Ottersten1,3
Abstract Existing satellite communication standards such as DVB-S2, operate under highly-efficient adaptive coding and modulation schemes thus making significant progress in improving the spectral efficiencies of digital satellite broadcast systems. However, the constantly increasing demand for broadband and interactive satellite links emanates the need to apply novel interference mitigation techniques, striving towards Terabit throughput. In this direction, the objective of the present contribution is to investigate joint multiuser processing techniques for multibeam satellite systems. In the forward link, the performance of linear precoding is investigated with optimal nonlinear precoding (i.e., dirty article coding) acting as the upper performance limit. To this end, the resulting power and precoder design problems are approached through optimization methods. Similarly, in the return link the concept of linear filtering (i.e., linear minimum mean square error) is studied with the optimal successive interference cancelation acting as the performance limit. The derived capacity curves for both scenarios are compared to conventional satellite systems where beams are processed independently and interbeam interference is mitigated through a four color frequency reuse scheme, in order to quantify the potential gain of the proposed techniques. 1 Introduction Current satellite systems, following the cellular paradigm, employ multiple antennas (i.e., multiple onboard antenna feeds) to divide the coverage area into small beams (spotbeams). To the end of limiting interbeam interferences, these multibeam satellite communication (SatCom) systems spatially separate beams that share the same bandwidth. This multibeam architecture allows for a significant boost in capacity by reusing the available spectrum several times within the coverage area, especially in the Ka-band. Subsequently, the capacity of current satellite systems can well exceed 100 GBps with state-of-the-art architectures [1]. A large number of recent satellite systems procurements have clearly confirmed the trend towards multibeam satellite systems as broadband reference system architecture. Examples include systems such as Wildblue-1 and Anik F2 (66 Ka-band spot beams), Kasat (82 Ka-band spot beams) and recently Viasat-1 (72 spot beams in Ka-band) for * Correspondence: [email protected] 1 Interdisciplinary Centre for Security, Reliability and Trust (SnT), University of Luxembourg, 6 rue Richard Coudenhove-Kalergi, L-1359 LuxembourgKirchberg, Luxembourg Full list of author information is available at the end of the article
mainly fixed two-way (i.e., interactive) broadband applications as well as the GlobalExpress system designed for a new generation of mobile services in Ka-band. Interactive services, in particular, benefit from these archit
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