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dc.contributor.authorJoroughi, Vahid
dc.contributor.authorVázquez, Miguel Ángel
dc.contributor.authorPérez Neira, Ana Isabel
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
dc.identifier.citationJoroughi, V., Vázquez, M., Perez, A. Generalized multicast multibeam precoding for satellite communications. "IEEE transactions on wireless communications", 1 Febrer 2017, vol. 16, núm. 2, p. 952-966.
dc.description.abstractThis paper deals with the problem of precoding in multibeam satellite systems. In contrast to general multiuser multiple-input-multiple-output cellular schemes, multibeam satellite architectures suffer from different challenges. First, satellite communications standards embed more than one user in each frame in order to increase the channel coding gain. This leads to the different so-called multigroup multicast models, whose optimization requires computationally complex operations. Second, when the data traffic is generated by several Earth stations (gateways), the precoding matrix must be distributively computed and meet additional payload restrictions. Third, since the feedback channel is adverse (large delay and quantization errors), the precoding must be able to deal with such uncertainties. In order to solve the aforementioned problems, we propose a two-stage precoding design in order to both limit the multibeam interference and to enhance the intra-beam minimum user signal power (i.e., the one that dictates the rate allocation per beam). A robust version of the proposed precoder based on a first perturbation model is presented. This mechanism behaves well when the channel state information is corrupted. Furthermore, we propose a per beam user grouping mechanism together with its robust version in order to increase the precoding gain. Finally, a method for dealing with the multiple gateway architecture is presented, which offers high throughputs with a low inter-gateway communication. The conceived designs are evaluated with a close-to-real beam pattern and the latest broadband communication standard for satellite communications.
dc.format.extent15 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Comunicacions mòbils
dc.subject.lcshWireless communication systems
dc.subject.lcshArtificial satellites in telecommunication
dc.subject.otherMultigroup multicast
dc.subject.otherMultibeam satellite systems
dc.subject.otherRobust design
dc.titleGeneralized multicast multibeam precoding for satellite communications
dc.subject.lemacComunicació sense fil, Sistemes de
dc.subject.lemacSatèl·lits artificials en telecomunicació
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (updated version)
upcommons.citation.authorJoroughi, V., Vázquez, M., Perez, A.
upcommons.citation.publicationNameIEEE transactions on wireless communications

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