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Dissertations / Theses on the topic 'Satellite communication systems'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

ALMEIDA, MARTA PUDWELL CHAVES DE. "RADIOPROPAGATION IN SATELLITE COMMUNICATION SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1996. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9622@1.

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O desenvolvimento de sistemas de comunicações via satélite requer a introdução de novas tecnologias e novas técnicas, e o uso de freqüências elevadas superiores a 10 GHZ. Para aplicações utilizando freqüências acima de 10 GHz, deve ser considerada predominantemente a atenuação causada pela chuva. Este trabalho apresenta resultados intermediários de uma campanha de medidas realizada no CETUC, na faixa de 12 GHz. Esta campanha foi iniciada em 1987 com a realização de medidas radiométricas em diferentes regiões climáticas do Brasil. Em 1995, foram adquiridos sistemas de recepção de sina

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2

Mohanty, Nirode C. "DEMAND ACCESS SATELLITE COMMUNICATION SYSTEMS." International Foundation for Telemetering, 1985. http://hdl.handle.net/10150/615594.

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International Telemetering Conference Proceedings / October 28-31, 1985 / Riviera Hotel, Las Vegas, Nevada<br>A demand access Satellite Communication System for multiple users has been analyzed. A number of channels, m 1, of each satellites are necessary to coordinate the self-served users to allow access to a satellite having s channels. m depends upon traffic intensity and number of top priority users. A waiting time period for a Poisson arrival and exponential holding time M/M/s system for “preemptive resume” discipline has been derived. There is a significant reduction in waiting time in a

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3

Paul, Jean R. "Communication platform for inter-satellite links in distributed satellite systems." Thesis, University of Surrey, 2011. http://epubs.surrey.ac.uk/770149/.

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A Distributed Satellite System (DSS) for space weather monitoring, in which satellites are able to exchange data via Inter-Satellite Links (lSL) and a master node communicates with ground is the target of this research. As design of satellite systems is dictated by economical and engineering factors, the use of readily available commercial wireless terrestrial network technologies for ISLs is an attractive prospect in distributed satellite systems. This work addresses the application of wireless terrestrial networking standards to DSS operating in Low Earth Orbits (LEO), which are affected by

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4

Ah-Thew, George Patrick. "Doppler compensation for LEO satellite communication systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0005/NQ42831.pdf.

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5

Zapata, Augusto J. "Analysis of maritime mobile satellite communication systems." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/22890.

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6

Leelaratne, D. R. V. "Printed antennas for mobile satellite communication systems." Thesis, University of Kent, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369608.

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7

Sabala, Ryan J. "Satellite Attitude Determination Using Laser Communication Systems." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1218636153.

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8

Alouini, Mohamed-Slim. "Impact of the atmosphere on K [subscript a]-Band satellite communication systems." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/15364.

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9

Marzolini, Remo G. A. "Demodulator techniques in satellite communication systems for direct broadcast systems." Thesis, Open University, 1996. http://oro.open.ac.uk/57636/.

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This thesis is concerned with the FM demodulator techniques used in terrestrial TV receiver designs for Direct Broadcast Systems (DBS) from satellites. The various MAC/Packet schemes intended for DBS applications are described and the international standards that apply to them considered, with particular emphasis on the D2-MAC system. Noise in FM systems is discussed and a suitable threshold noise model is chosen for use in DBS TV demodulator systems. The characteristics of the various types of noise effects are considered in terms of their effect upon the TV picture. The threshold performance

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10

Muratori, Erik. "Analysis of Space Communication Systems via Satellite Relaying." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22837/.

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È noto che l’uso di bande a RF con frequenze estremamente alte nei sistemi wireless per comunicazione digitale consente potenzialmente di raggiungere velocità di trasmissione dei dati molto elevate, rispetto a quelli ottenibili a frequenze più basse, a parità di tasso di errore. Ciò è vero in particolare per propagazione in spazio libero con antenne direttive. Tali bande di frequenza estremamente elevate sono tuttavia raramente impiegate nelle comunicazioni spaziali deep-space a causa della loro vulnerabilità ai disturbi atmosferici. Tuttavia, esse possono potenzialmente fornire diversi vantag

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11

Beyene, Dereje, and Befkadu Degefa. "Adaptive Antenna Arrays for Satellite Mobile Communication Systems." Thesis, Linnaeus University, School of Computer Science, Physics and Mathematics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-191.

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<p>Adaptive antenna arrays have a great importance in reduction of the effect of interference and increase the capacity for the mobile satellite communication. Interference and multipath fading remain a main problem for reception of signals. These two problems obviously affect the overall capacity. Adaptive antenna arrays in the handheld mobile apparatus will be the solution for the above two problems.</p><p> </p><p>Satellite mobile communication is one of the growing fields in the communication area where terrestrial infrastructures are unable or ineffective to supply. Maritime, aeronautical

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12

Karpinsky, Christopher J. (Christopher John) 1972. "Uplink multiple access techniques for satellite communication systems." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/49644.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.<br>Includes bibliographical references (leaves 90-92).<br>by Christopher J. Karpinsky.<br>M.S.

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13

Lian, Keng Jin. "Adaptive Antenna Arrays for Satellite Personal Communication Systems." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36949.

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Since about the turn of the decade, several proposals have come forth for personal communication services implemented by means of multiple satellite systems. These satellite systems are similar to current terrestrial cellular technologies, which are still relatively new and have numerous technical problems associated with them. As a result, these satellite systems will also experience some of the similar problems. Two of such problems are the issue of multipath and interference. These problems may result in significant link degradation and affect overall capacity. To overcome this problem, ada

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14

Talal, Mohammed. "Modem design for digital satellite communications." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/7442.

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The thesis is concerned with the design of a phase-shift keying system for a digital modem, operating over a satellite link. Computer simulation tests and theoretical analyses are used to assess the proposed design. The optimum design of both transmitter and receiver filters for the system to be used in the modem are discussed. Sinusoidal roll-off spectrum with different roll-off factor and optimum truncation lengths of the sample impulse response are designed for the proposed scheme to approximate to the theoretical ideal. It has used an EF bandpass filter to band limit the modulated signal,

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15

Botha, Jakobus Stephanus. "A reusable signal processing architecture for satellite based communication systems." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6503.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: Keywords: digital signal processing, embedded systems, telecommunications, satellite technology. The rapid growth of the telecommunications industry is a worldwide phenomenon with people and computers generating and transmitting more and more information daily. Despite this growth, there are still areas in South Africa which lack terrestrial communications coverage. People inhabit these rural areas and their essential communication needs are not met. Satellite based communicat

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16

Gopal, Pooja. "Performance analysis and enhancement of free space optical satellite links." Thesis, IIT Delhi, 2016. http://localhost:8080/xmlui/handle/12345678/7226.

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17

Sammut, Anthony J. R. "Radio resource management for satellite personal communication networks." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843349/.

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A novel flexible channel allocation scheme is proposed which is applicable to medium altitude, high diversity satellite personal communication systems with an interconnected ground control segment. The scheme is built upon the establishment of several temporal master-slave network hierarchies in distinct areas of the Earth, whereby the control of radio resources in each area is granted to a single network entity, the master, located at one of the network's fixed earth station sites. The master station is entrusted with the radio resource management functionality equivalent to a base station co

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18

He, Xiaoping. "The signalling system in satellite personal communication networks." Thesis, University of Surrey, 1996. http://epubs.surrey.ac.uk/844181/.

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Recent advances in both satellite and terrestrial mobile communications technologies are now leading to the realisation of the dream of the global personal communications within a few years. Satellite systems, as a complement to terrestrial cellular systems, are introduced into the future Personal Communication Networks (S-PCN) to provide global coverage and to allow global roaming. The inter-working and the integration between the satellite and the terrestrial cellular systems (e.g. GSM system) are the key issues in developing the network architecture and designing the control functions and s

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19

Leitao, M. J. M. "Propagation factors affecting the design of satellite communication systems." Thesis, University of Bradford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355235.

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20

Higuchi, Nathan K. "UHF Applications for Radar and Pico-Satellite Communication Systems." Thesis, University of Hawaii at Manoa, 2002. http://hdl.handle.net/10125/6948.

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This thesis first discusses the design, fabrication, and test results of UHF preamplifier designed to operate from 400 to 500 MHz. The preamplifier integrates a single-pole double-throw (SPDT) switch, tapped-line interdigital filter, balanced low-noise amplifier, and gain stage in a compact, multilayer package. The switch and amplification stages are realized on one layer, and the stripline filter is realized on a second layer. The circuit board dimensions measure 4 inches x 1.25 inches x 0.12 inches. One hundred eight units were manufactured. The preamplifier has a 3-dB bandwidth of 100 MHz,

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21

De, Gaudenzi Riccardo. "Code division multiple access for satellite personal communication systems /." Noordwijk : ESA, 1999. http://www.gbv.de/dms/goettingen/303779977.pdf.

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22

Polaha, James Henry. "An analysis of low-earth-orbit-satellite communication systems." Thesis, Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/74533.

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There is an ever increasing need for low-cost communication systems in the world. One such system, low-earth-orbit satellites, can provide store-and-forward, as opposed to real time, communication for many earth stations. The advantages and disadvantages of such a system is presented. Material covering protocols and communications architectures is elaborated upon for the use of amateur radio communications. Doppler shift and its effect on satellites in low-earth-orbit is examined. Efficiency and throughput of the Amateur X.25 Protocol will be explored. The last chapter entails the analysis of

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23

Tiainen, Arttu. "Inter-Satellite Link Antennas : Review and The Near Future." Thesis, Luleå tekniska universitet, Rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62541.

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The emerging trend in distributed spacecraft systems of using multiple spacecraft which share functions as opposed to independent spacecraft has given opportunities for missions previously infeasible. Inter-satellite link (ISL) communications provide a direct link within the space segment without need of an intermediate ground segment to relay the data. As the distributed spacecraft systems (DSS) have become less exotic and more complex, the need and demand for inter-satellite antenna systems has increased and the requirements for the antenna systems more diverse and become more demanding. Thi

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24

Lomotey, Charles. "Strategies to Recover from Satellite Communication Failures." ScholarWorks, 2019. https://scholarworks.waldenu.edu/dissertations/7032.

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In natural and manmade disasters, inadequate strategies to recover from satellite communication (SATCOM) failures can affect the ability of humanitarian organizations to provide timely assistance to the affected populations. This single case study explored strategies used by network administrators (NAs) to recover from SATCOM failures in humanitarian operations. The study population were NAs in Asia, the Middle East, Central Africa, East Africa, and West Africa. Data were collected from semistructured interviews with 9 NAs and an analysis of network statistics for their locations. The resource

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25

Bramwell, Jonathan Richard. "The use of digital signal processing in satellite communication." Thesis, University of Plymouth, 1988. http://hdl.handle.net/10026.1/2479.

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The recent emphasis on Information Technology has increased the need for methods of data communications with a greater interest in the areas of Satellite communications. Data communications over a satellite can be easily achieved by the use of excessive power and bandwidth but efficient management of the satellite resource requires more elegant means of transmission. The optimum modulator and demodulator can be described by mathematical expressions to represent the physical processes that are required to transmit and receive a signal. Digital Signal Processing circuits can be use to implement

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26

Meenan, Christopher. "Advanced mobility management techniques for satellite mobile communication networks." Thesis, University of Surrey, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388995.

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27

Aguis, Andreas-Albertos. "Antennas for handheld satellite personal communicators." Thesis, University of Surrey, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298142.

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28

Valadon, Cyril. "Advanced CDMA receiver architectures for satellite multimedia communications." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843442/.

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Future mobile broadband communication systems aim to provide a wide range of multimedia services (telephony, video conferencing, audio and video broadcasting, etc.) to a large number of users. In order to achieve a global coverage and reach remote users, satellite is foreseen to be a key component in the development of such networks. When compared to first-generation mobile satellite communication systems, these future satellite networks will need to provide significantly higher data rates whilst achieving very low bit error probability values. In order to keep the mobile user terminal as well

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29

Qi, Ronggang. "Mulicarrier demultiplexing and VLSI implementation for satellite communications systems." Thesis, University of Surrey, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308476.

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30

Al-Khaled, Fahad Sulaiman. "Efficient radio channel assignment techniques for mobile satellite communication networks." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391293.

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31

Karacaoglu, Ulun. "MIC an MMIC active filters for satellite and mobile communication." Thesis, King's College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286349.

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32

Ollars, Emil. "Design and characterization of a radio receiver for satellite communication." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-87007.

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Due to the increase in volume and speed of data transmissions in recent years, the demand for high-speed satellite communication solutions has increased. This thesis investigates the possibility of making a receiver for satellite radio based on an Analog Devices ADC evaluation board. To do this, evaluation boards for each component were acquired and tested individually before connecting them. The system components include an I/Q demodulator, a local oscillator, and an ADC. Using these components a system design for the radio receiver has been proposed, and its performance analyzed. The SNR of

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33

Anderson, Paul David. "Array design and beamforming for satellite earth terminals." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/15357.

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34

Mertzanis, Ioannis. "QOS provisioning for broadband satellite-ATM multimedia networks." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/773030/.

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This work is motivated by the current trends in future broadband communication networks. On the one hand, the latest developments and experimentation with the Asynchronous Transfer mode (ATM) technology shows that that ATM is going to be the future transport mechanism in many private and public networks. This is driven by the need to efficiently support a large population of widebandlbroadband users with different data traffic characteristics and certain Quality of Service (QoS) guarantees. On the other hand, the interest in satellites and their role in the future broadband multimedia communic

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35

Alawadi, Tareq A. "Investigation of the effects of cloud attenuation on satellite communication systems." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7991.

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The aim of this project is to investigate the attenuation due to clouds at 20- 50GHz; to develop an accurate long-term prediction model of cloud attenuation applicable to slant-path links and evaluate the impact of cloud attenuation dynamics on the design of future portable EHF earth-space systems. Higher frequencies offer several advantages, for example, greater bandwidth and immunity to ionospheric effects. The EHF band is being targeted for the launch of earth-space communication systems to provide global delivery of bandwidthintensive services (e.g. interactive HDTV, broadband internet acc

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36

Thesnaar, Emile Jacobus. "Development of a radiation resistant communication node for satellite sub-systems." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86510.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Within a complex electronic system, sub-system communication forms the backbone of the functionality of any satellite. It allows multiple processors to run simultaneously and data to be shared amongst them. Without it, a single processor would have to control the entire satellite. Not only would such a design then be overly complicated, but the processor would also not have sufficient capacity to service all the components efficiently. Furthermore the detrimental effects that radiation have on integrated circuits are well

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37

Al-Dalakta, Emad Yacoub Qeryaqos. "PAPR and ICI reduction techniques for OFDM based satellite communication systems." Thesis, University of Newcastle upon Tyne, 2012. http://hdl.handle.net/10443/1528.

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Multi-carrier systems such as orthogonal frequency division multiplexing (OFDM) are significantly affected by peak-to-average-power ratio (PAPR). Unfortunately, the high PAPR inherent to OFDM signals envelopes will occasionally drive high power amplifiers (HPAs) to operate in the nonlinear region of their characteristic curve. The nonlinearity of the HPA exhibits amplitude and phase distortions, which cause loss of orthogonality among the subcarriers (SCs), and hence, inter-carrier interference (ICI) is introduced in the transmitted signal. The ICI power is proportional to the amplitude of the

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38

Deambrogio, Lina <1979&gt. "Enabling Techniques and Algorithms for Integrated Communication and Navigation Satellite Systems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4336/1/Deambrogio_Lina_Tesi.pdf.

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This thesis presents the outcomes of my Ph.D. course in telecommunications engineering. The focus of my research has been on Global Navigation Satellite Systems (GNSS) and in particular on the design of aiding schemes operating both at position and physical level and the evaluation of their feasibility and advantages. Assistance techniques at the position level are considered to enhance receiver availability in challenging scenarios where satellite visibility is limited. Novel positioning techniques relying on peer-to-peer interaction and exchange of information are thus introduced. More spe

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39

Deambrogio, Lina <1979&gt. "Enabling Techniques and Algorithms for Integrated Communication and Navigation Satellite Systems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4336/.

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This thesis presents the outcomes of my Ph.D. course in telecommunications engineering. The focus of my research has been on Global Navigation Satellite Systems (GNSS) and in particular on the design of aiding schemes operating both at position and physical level and the evaluation of their feasibility and advantages. Assistance techniques at the position level are considered to enhance receiver availability in challenging scenarios where satellite visibility is limited. Novel positioning techniques relying on peer-to-peer interaction and exchange of information are thus introduced. More spe

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40

Icolari, Vincenzo Riccardo <1989&gt. "Cognitive-Based Solutions to Spectrum Issues in Future Satellite Communication Systems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amsdottorato.unibo.it/7907/1/icolari_vincenzoriccardo_tesi.pdf.

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With particular attention to Satellite Communications (SatComs), cognitive-based solutions are investigated. With cognitive-based solutions we refer to all those techniques that aim at improving spectrum utilization of the available spectrum and rely on the knowledge of the environment in which the systems operate. As a matter of fact, an improved spectrum utilization enables higher throughput capacities that will satisfy the future markets and demands of an increasingly connected world. Throughout the thesis, several techniques are proposed, developed, and assessed with respect to specific s

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41

Hartigan, Patrick Francis. "Forecasting of radiowave attenuation on earth-space links." Thesis, Coventry University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332325.

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42

Zhao, Wei. "Handover techniques and network integration between GSM and satellite mobile communication systems." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/2322/.

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43

Harrell, Andre T. "Wireless technology via satellite communications for peacekeeping operations." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://library.nps.navy.mil/uhtbin/hyperion-image/01Sep%5FHarrell.pdf.

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Thesis (M.S. in Information Systems Technology)--Naval Postgraduate School, September 2001.<br>Thesis advisor(s): Tri T. Ha, Nancy Roberts. Includes bibliographical references (p. 85-87). Also available online.

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44

Begum, Sahena. "Reliable broadband satellite-integrated network design through propagation and networking solutions." Thesis, University of South Wales, 2009. https://pure.southwales.ac.uk/en/studentthesis/reliable-broadband-satelliteintegrated-network-design-through-propagation-and-networking-solutions(aa71347b-031f-437d-9da0-6e8432e19630).html.

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Satellites will play an indispensable role in the deployment of commercial networks to meet an increasing demand for supporting multimedia services at high data rates. Next generation satellite systems, operating at high frequency bands offer large bandwidth and are able to provide broadband services. To interface satellite links with existing terrestrial networks for providing communication access to a variety of users directly, several performance issues need to be addressed. Current thesis presents a technically viable satellite-integrated network model that is efficient in carrying broadba

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45

Gremont, Boris Christian. "Fade countermeasure modelling for Ka band digital satellite links." Thesis, Coventry University, 1997. http://curve.coventry.ac.uk/open/items/d85e8a85-635c-d024-3737-d1205f235596/1.

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This thesis investigates the modelling of fade countermeasures (FCMs) for the design of geostationary Ka band digital satellite communication systems. The analysis focuses on a typical low-power low-rate very small aperture terminal application using adaptive forward error correction as a way of counteracting the high level of detected dynamic atmospheric fading. The management and performance of such systems is conditioned greatly by the ability of practical controllers at detecting the actual level of total signal attenuation. At 20 or 30 GHz, rain attenuation and tropospheric scintillation

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Kassianides, Constantinos N. "A study of the effects of scintillation on digital satellite communication systems." Thesis, University of South Wales, 2002. https://pure.southwales.ac.uk/en/studentthesis/a-study-of-the-effects-of-scintillation-on-digital-satellite-communication-systems(19190903-59f8-4350-9a59-2d2a70e1a623).html.

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The growth of satellite communication industry and the need to offer new and better services, to compete with optical fiber systems, have driven the satellite industry to search for higher bandwidth and improved cost of services. Higher frequency bands, such as Ka and V-band, came into play. These frequency bands have the advantage of efficient use of spectrum, the ability to transfer data at much higher rates, and the use of smaller antennas resulting in lower cost for the user. A major drawback though, is the severity of propagation impairments. Scintillation becomes important for low-fade m

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Yenice, Yusuf E. "Effects of atmospheric turbulence on ground-satellite optical communications and countermeasures." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843086/.

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The theoretical advantages of ground-satellite optical communication systems can only be exploited, if means can be found to circumvent the limitations due to atmospheric effects. Atmospheric turbulence dominates the analysis and design of these links. The effects of atmospheric turbulence on the performance of ground-satellite optical communication systems and possible countermeasures are investigated in this thesis. The design and analysis of any optical system operating in the atmosphere requires empirical investigations of atmospheric turbulence conditions at the system's location. Stellar

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48

Suvannapattana, P. "Analysis and design of user terminal antennas for mobile satellite communications." Thesis, University of Surrey, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326196.

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49

Doumi, Tewfik Lahcene. "A simulator for the narrow band satellite mobile radio channel." Thesis, University of Bradford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304181.

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Wada, Tadahiro, Takaya Yamazato, Masaaki Katayama, and Akira Ogawa. "A New M-ary/SSMA Scheme Applicable in LEO Satellite Communication Systems." IEEE, 1996. http://hdl.handle.net/2237/7781.

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