Link Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbed

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dc.contributor.authorKilcoyne, Deirdre Kathleenen
dc.contributor.committeechairMcGwier, Robert W.en
dc.contributor.committeememberBuehrer, R. Michaelen
dc.contributor.committeememberBeex, Aloysius A.en
dc.contributor.committeememberHeadley, William C.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2016-06-16T08:00:12Zen
dc.date.available2016-06-16T08:00:12Zen
dc.date.issued2016-06-15en
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
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:7604en
dc.identifier.urihttp://hdl.handle.net/10919/71362en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectlink adaptationen
dc.subjectadaptive modulationen
dc.subjectshadowingen
dc.subjecterror vector magnitudeen
dc.titleLink Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbeden
dc.typeThesisen
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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