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dc.contributor.authorKilcoyne, Deirdre Kathleenen_US
dc.date.accessioned2016-06-16T08:00:12Z
dc.date.available2016-06-16T08:00:12Z
dc.date.issued2016-06-15en_US
dc.identifier.othervt_gsexam:7604en_US
dc.identifier.urihttp://hdl.handle.net/10919/71362
dc.description.abstractIn Earth-to-Space communications, well-known propagation effects such as path loss and atmospheric loss can lead to fluctuations in the strength of the communications link between a satellite and its ground station. Additionally, a less-often considered effect of shadowing due to the geometry of the satellite and its solar panels can also lead to link degradation. As a result of these anticipated channel impairments, NASA's communication links have been traditionally designed to handle the worst-case impact of these effects through high link margins and static, lower rate, modulation formats. This thesis first characterizes the propagation environment experienced by a software-defined radio on the NASA SCaN Testbed through a full link-budget analysis. Then, the following chapters propose, design, and model a link adaptation algorithm to provide an improved trade-off between data rate and link margin through varying the modulation format as the received signal-to-noise ratio fluctuates.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectlink adaptationen_US
dc.subjectadaptive modulationen_US
dc.subjectshadowingen_US
dc.subjecterror vector magnitudeen_US
dc.titleLink Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbeden_US
dc.typeThesisen_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineElectrical Engineeringen_US
dc.contributor.committeechairMcGwier, Robert W.en_US
dc.contributor.committeememberBuehrer, Richard Michaelen_US
dc.contributor.committeememberBeex, Aloysius A.en_US
dc.contributor.committeememberHeadley, William C.en_US


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