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dc.contributor.advisorWatson, P.A.
dc.contributor.advisorGardiner, John G.
dc.contributor.authorFenech, Hector T.*
dc.date.accessioned2011-08-26T16:32:59Z
dc.date.available2011-08-26T16:32:59Z
dc.date.issued2011-08-26
dc.identifier.urihttp://hdl.handle.net/10454/5028
dc.description.abstractThis thesis is a study of multiple access schemes for satellite land mobile systems that provide a domestic or regional service to a large number of small terminals. Three orbit options are studied, namely the geostationary, elliptical (Molniya) and inclined circular orbits. These are investigated for various mobile applications and the choice of the Molniya orbit is justified for a U. K. system. Frequency, Time and Code Division Multiple Access (FDMA, TDMA and CDMA) are studied and their relative merits in the mobile environment are highlighted. A hybrid TDMA/FDMA structure is suggested for a large system. Reservation ALOHA schemes are appraised in a TDMA environment and an adaptive reservation multiple access protocol is proposed and analysed for a wide range of mobile communication traffic profiles. The system can cope with short and long data messages as well as voice calls. Various protocol options are presented and a target system having 100,000 users is considered. Analyses are presented for the steady state of protocols employing pure and slotted ALOHA and for the stabilty of the slotted variant, while simulation techniques were employed to validate the steady state analysis of the slotted ALOHA protocol and to analyse the stability problem of the pure ALOHA version. An innovative technique is put forward to integrate the reservation and the acquisition processes. It employs the geographical spread of the users to form part of the random delay in P-ALOHA. Finally an economic feasibility study is performed for the spacesegment. For costs of capital (r) less than 23 % the discounted payback period is less than the project's lifetime (10 years). At r- 8% the payback period is about 5.6 years, while the internal-rate-of-return is 22.2 %. The net present value at the end of the projects lifetime is £M 70 at r-8%.en_US
dc.language.isoenen_US
dc.rights<a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-nc-nd/3.0/88x31.png" /></a><br />The University of Bradford theses are licenced under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/">Creative Commons Licence</a>.en_US
dc.subjectSatellite multiple access protocolsen_US
dc.subjectLand mobile terminalsen_US
dc.subjectMultiple access environmenten_US
dc.subjectDesign and analysisen_US
dc.subjectSimulationen_US
dc.subjectPerformance evaluationen_US
dc.subjectUnited Kingdom (UK)en_US
dc.subjectGeostationary orbiten_US
dc.subjectElliptical orbiten_US
dc.subjectInclined circular orbiten_US
dc.titleSatellite multiple access protocols for land mobile terminals. A study of the multiple access environment for land mobile satellite terminals, including the design analysis and simulation of a suitable protocol and the evaluation of its performance in a U.K. system.en_US
dc.type.qualificationleveldoctoralen_US
dc.publisher.institutionUniversity of Bradfordeng
dc.publisher.departmentPostgraduate School of Studies in Information Systems Engineeringen_US
dc.typeThesiseng
dc.type.qualificationnamePhDen_US
dc.date.awarded1987
refterms.dateFOA2018-10-24T01:20:27Z


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