Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"VSAT"”.
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Performance analysis of VSAT networks
Very small aperture terminal (VSAT) networks offer a solution to the increasing demand for low-density voice and data communications. Spread Spectrum and single-channel-per-carrier (SCPC) transmission techniques work well for multiple access purposes while allowing the earth station antennas to …
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An educational VSAT system for Thailand
… needs of education in Thailand. An educational VSAT network for Thailand needs a central hub station in Bangkok and seven remote sites with VSAT equipment. The network supports two way compressed video, voice and data links between the central hub and VSAT sites. This thesis examines rain …
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Performance analysis of star architecture packet-switched VSAT networks using random code division multiple access
… in packet-switched Very Small Aperture Terminal (VSAT) satellite communication networks. This research consisted of three major thrusts. First, we analyzed the average time delay of the broadcast Time Division Multiplexing (TDM) outbound channel (hub to VSAT). Second, a throughput performance …
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Performance analysis of star architecture packet-switched VSAT network using roll-call polling multiple access scheme
… performance of a Very Small Aperture Terminal (VSAT) satellite star network. The network uses roll-call polling as its multiple access scheme, High-level Data Link Control or HDLC, and go-back-N Automatic Repeat Request, for error control. The network is a VSAT packet-switched network, that …
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Performance characteristics of a multiple use Ku-band satellite network
… LAMP was developed. detailed system design of a VSAT network is given in later chapters. The development of VSAT networks considers multiple access and data traffic control protocols. VSAT network performance under various traffic conditions also is determined.
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Measuring attention: An evaluation of the Search and Cancellation of Ascending Numbers (SCAN) and the short form of the Test of Attentional and Interpersonal Style (TAIS)
… Span, and Visual Search and Attention Test (VSAT). Data suggest the measures represent a common construct interpreted to be attention. An auditory distracter condition of the SCAN did not distract participants, while the measure exhibited ample alternate forms reliability. The study also …
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Spread spectrum satellite multiple access and overlay service
… technology to very small aperture terminal (VSAT) satellite communication networks. It describes two spread spectrum multiple access systems which use a form of noncoherent M-ary FSK (MFSK) as the primary modulation and analyzes their throughput. The analysis considers such factors as …
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Spiritual Care in Advanced Practice Nursing
… research: Vincensi Spiritual Assessment Tool (VSAT) and Vincensi Spiritual Care Intervention Tool (VSCIT). Content validity was completed and internal reliability scores ranged from 0.87 to 0.93 on the new tools. Findings indicated GNPs' spiritual perspectives are high-moderate at 4.73 on a 1-6 …
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Analysis and design of a data network for distance education for the state of Virginia
… of 1E-6 or less. A very small aperture terminal (VSAT) network has also been proposed for the purpose.
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Design and characterization of flat lens antenna using aperture-coupled microstrip patches
… of wireless airborne systems such as VSAT (Very Small Aperture Terminal).
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“It depends on the individual”: A psycho-social exploration of designated teachers’ and virtual school advisory teachers’ experiences of supporting looked after children in education.
… This study is a psycho-social exploration of VSAT and DT’s experiences of supporting LAC pupils within education, both academically and emotionally. Eight interviews were conducted, four with VSATs and four with their link DTs in primary and secondary schools. Unstructured interviews were …
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Viability of High Availability Kband Satellite Communication using Hybrid Fade Mitigation
… diversity are available to mitigate the hub and VSAT fading respectively. Signal processing and power control are also found to be complementary techniques.
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A Study of the Effects of Scintillation on Digital Satellite Communication Systems
… the last part, data transfer scenarios in VSAT systems incorporating adaptive modulation, ARQ and adaptive up-link power control are presented. The implementation of the adaptive system in a COSSAP simulation platform is discussed and individual adaptive components are simulated and …
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Accurate Prediction of Scintillation Degradation Applicable to Satellite Communication Systems Design
… degradation. The small size antennas employed in VSAT and USAT systems significantly reduce the cost of earth station terminals and also eliminate tracking requirements, but they lose the mitigating effect of aperture averaging and hence experience stronger scintillation. The result is random …
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Evaluation of NEPAD’s pilot e-schools in Kenya
… in teaching and learning. All the e-Schools had VSAT for internet access via satellite in computer laboratories in which a variable number of computers were installed. The computers were networked using structured cabling into a LAN, and the LANS were linked into a WAN through the VSATs. The …
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A Study into the Tradeoffs Between TDM / MF-SCPC and TDM / MF-TDMA Transport Options to Support IP-Based Multimedia Applications Under Different Load Conditions Within a Point-to-Multipoint Satellite Network
This thesis provides the reader with an overview of the many elements that are involved in geosynchronous satellite point-to-multipoint Internet Protocol (IP)-based multimedia communications design and also takes a deep dive into the analysis of a real-life scenario, using the TDM / MF-SCPC and TDM …
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System Design of an Integrated Terrestrial-Satellite Communications Network for Disaster Recovery
This thesis describes a possible integrated terrestrial-satellite network system for disaster recovery and response. The motivation of this thesis was based on the adjacent spectrum allocations between the Virginia Tech terrestrial Local Multiple Distribution Service (LMDS) system and a Ka-band …
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Satellite Rural Telephone Network Design: A Methodology for Performance Optimization
Rural telephony has historically been a recurring subject of concern for most large developing countries. It is generally considered that rural telephone users do not generate the same level of telephone traffic and, thus, revenue as urban users, lowering the incentives to invest in rural …