Please use this identifier to cite or link to this item: https://hdl.handle.net/1889/3206
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dc.contributor.advisorColavolpe, Giulio-
dc.contributor.authorUgolini, Alessandro-
dc.date.accessioned2016-08-02T15:06:16Z-
dc.date.available2016-08-02T15:06:16Z-
dc.date.issued2016-
dc.identifier.urihttp://hdl.handle.net/1889/3206-
dc.description.abstractIn this thesis, we consider four different scenarios of interest in modern satellite communications. For each scenario, we will propose the use of advanced solutions aimed at increasing the spectral efficiency of the communication links. First, we will investigate the optimization of the current standard for digital video broadcasting. We will increase the symbol rate of the signal and determine the optimal signal bandwidth. We will apply the time packing technique and propose a specifically design constellation. We will then compare some receiver architectures with different performance and complexity. The second scenario still addresses broadcast transmissions, but in a network composed of two satellites. We will compare three alternative transceiver strategies, namely, signals completely overlapped in frequency, frequency division multiplexing, and the Alamouti space-time block code, and, for each technique, we will derive theoretical results on the achievable rates. We will also evaluate the performance of said techniques in three different channel models. The third scenario deals with the application of multiuser detection in multibeam satellite systems. We will analyze a case in which the users are near the edge of the coverage area and, hence, they experience a high level of interference from adjacent cells. Also in this case, three different approaches will be compared. A classical approach in which each beam carries information for a user, a cooperative solution based on time division multiplexing, and the Alamouti scheme. The information theoretical analysis will be followed by the study of practical coded schemes. We will show that the theoretical bounds can be approached by a properly designed code or bit mapping. Finally, we will consider an Earth observation scenario, in which data is generated on the satellite and then transmitted to the ground. We will study two channel models, taking into account one or two transmit antennas, and apply techniques such as time and frequency packing, signal predistortion, multiuser detection and the Alamouti scheme.it
dc.language.isoIngleseit
dc.publisherUniversità di Parma. Dipartimento di Ingegneria dell'Informazioneit
dc.relation.ispartofseriesDottorato di ricerca in Tecnologie dell'Informazioneit
dc.rights© Alessandro Ugolini, 2016it
dc.subjectsatellite communicationsit
dc.subjecttime frequency packingit
dc.subjectfaster-than-Nyquistit
dc.subjectmultiuser detectionit
dc.subjectmultiple access channelit
dc.subjectmultibeam satelliteit
dc.subjectEarth observationit
dc.subjectpredistortionit
dc.subjectchannel shorteningit
dc.subjectconstellation optimizationit
dc.subjectDVB-S2Xit
dc.subjectbroadcastingit
dc.subjectspectral efficiencyit
dc.subjectco-located satellitesit
dc.subjectinformation rate analysisit
dc.subjectAlamouti space-time block codeit
dc.titlePhysical and MAC layer techniques for next generation satellite communicationsit
dc.typeDoctoral thesisit
dc.subject.miurING-INF/03it
Appears in Collections:Tecnologie dell'informazione. Tesi di dottorato

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