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Dissertations / Theses on the topic 'Radio'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Zhao, Youping. "Enabling Cognitive Radios through Radio Environment Maps." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/27826.

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In recent years, cognitive radios and cognitive wireless networks have been introduced as a new paradigm for enabling much higher spectrum utilization, providing more reliable and personal radio services, reducing harmful interference, and facilitating the interoperability or convergence of different wireless communication networks. Cognitive radios are goal-oriented, autonomously learn from experience and adapt to changing operating conditions. Cognitive radios have the potential to drive the next generation of radio devices and wireless communication system design and to enable a variety of

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2

Navalekar, Abhijit C. "Distributed Digital Radios for Land Mobile Radio Applications." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-dissertations/4.

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The main objective of this dissertation is to develop the second generation of Distributed Digital Radio (DDR) technology. A DDR II modem provides an integrated voice/data service platform, higher data rates and better throughput performance as compared to a DDR I modem. In order to improve the physical layer performance of DDR modems an analytical framework is first developed to model the Bit Error Rate (BER) performance of Orthogonal Frequency Division Multiplexing over Frequency Modulation (OFDM/FM) systems. The use of OFDM provides a spectrally efficient method of transmitting data over LM

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3

Ballena, Castillo Maria de Jesus. "Análisis de las temáticas desarrolladas por las radios comunitarias y educativas: Radio Cutivalú y Radio Vino." Bachelor's thesis, Universidad Católica Santo Toribio de Mogrovejo, 2019. http://hdl.handle.net/20.500.12423/2786.

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El presente trabajo de investigación tuvo como objetivo principal analizar las temáticas desarrolladas por las radios comunitarias y educativas: radio Cutivalú y radio Vino; y como objetivos específicos los siguientes: describir las características de las radios comunitarias y educativas: radio Cutivalú y radio Vino, identificar las temáticas que se desarrollan en radio Cutivalú y radio Vino, y señalar los aportes de las temáticas en el desarrollo de las comunidades en las que están establecidas radio Cutivalú y radio Vino. La metodología que se utilizó en la investigación fue cualitativa, con

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4

Miller, Philip Geoffrey. "Radio-loud and radio-quiet quasars." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260417.

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5

Kim, Kyou Woong. "Exploiting Cyclostationarity for Radio Environmental Awareness in Cognitive Radios." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/27928.

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The tremendous ongoing growth of wireless digital communications has raised spectrum shortage and security issues. In particular, the need for new spectrum is the main obstacle in continuing this growth. Recent studies on radio spectrum usage have shown that pre-allocation of spectrum bands to specific wireless communication applications leads to poor utilization of those allocated bands. Therefore, research into new techniques for efficient spectrum utilization is being aggressively pursued by academia, industry, and government. Such research efforts have given birth to two concepts: Cognitiv

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6

Poulain, Sebastien. "Les radios alternatives : l'exemple de Radio Ici et Maintenant." Thesis, Bordeaux 3, 2015. http://www.theses.fr/2015BOR30020/document.

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Dans cette thèse, nous nous demandons comment les mouvements contreculturels ont trouvé de nouveaux lieux d’expression grâce à la plus grande accessibilité de l’audiovisuel, grâce aussi au combat des « radios libres ». Plus précisément, nous cherchons à savoir pourquoi et comment la société et l’audiovisuel français ont permis la constitution d’un média alternatif radiophonique comme Radio Ici et Maintenant (RIM) et comment cette radio a trouvé un modèle économique viable pour diffuser son idéologie. Nous verrons que l’existence et la persistance de RIM est due à la conjonction de deux phénomè

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7

Pirmoradian, Mahdi. "Radio resource management for cognitive radio networks." Thesis, Kingston University, 2012. http://eprints.kingston.ac.uk/23723/.

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Cognitive radio concept is a promising technology to cope with the spectrum scarcity issue in the emerging wireless technology. Practical cognitive radio as an intelligent radio is on the horizon, in which the system is able to observe radio environment, understanding its situation, and adapt its transceiver parameters without disruption to the licensed service. The main given functionality of the cognitive radio is dynamic spectrum management using underlay or overlay spectrum-sharing mechanisms. This thesis studies several objectives in cognitive radio networks namely; cumulative interferenc

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8

Moy, Christophe. "Evolution de la conception radio : de la radio logicielle à la radio intelligente." Habilitation à diriger des recherches, Université Rennes 1, 2008. http://tel.archives-ouvertes.fr/tel-00354493.

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Le manuscrit de cette Habilitation à Diriger des Recherches reprend quelques thèmes de mon parcours de recherche depuis 10 ans, et que l'on peut résumer ainsi. De la conception radio classique pendant ma thèse (à base d'ASIC) j'ai vécu la transition vers la conception radio logicielle (dans un laboratoire de recherche d'un grand groupe industriel) et enfin j'étends désormais en parallèle mes travaux vers la conception radio intelligente (dans un laboratoire de recherche académique). Cinq travaux sont repris dans ce mémoire, portant sur la radio logicielle et la radio intelligente. Ils correspo

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9

Marlow, Ryan Lane. "Making Radios with GReasy: GNU Radio With FPGAs Made Easy." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/50432.

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Radio technology is rapidly evolving and as processing capabilities and algorithms become more complex, the need for alternative compilation and user interface abstraction increases. Field Programmable Gate Array (FPGA) technology introduces unique reconfigurable hardware architectures that can aid in software defined radio (SDR) design. FPGAs have greater processing capability than traditional general purpose processors (GPP) found in desktop workstations. This work builds on an ongoing project, GReasy, that augments a Linux based open source SDR development platform, GNU Radio, with FPGA pro

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10

Ker, Louise Moira. "Radio AGN evolution with low frequency radio surveys." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7616.

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Supermassive black holes are leading candidates for the regulation of galaxy growth and evolution over cosmic time, via ‘feedback’ processes, whereby outflows from the Active Galactic Nuclei (AGN) halt star formation within the galaxy. AGN feedback is generally thought to occur in two modes, high-excitation (HERG, or ‘quasar-mode’) and low-excitation (LERG or ’radio-mode’) each having a different effect on the host galaxy. LERGs curtail the growth of the most massive galaxies, whereas HERGs are thought to be activated by mergers/interactions, switching off star formation at high redshift. A cr

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11

Irick, Charles Robert. "Enhancing GNU Radio for Hardware Accelerated Radio Design." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/33474.

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As technology evolves and new methods for designing radios arise, it becomes necessary to continue the search for fast and flexible development environments. Some of these new technologies include software defined radio (SDR), Field Programmable Gate Arrays (FPGAs), and the open source project GNU Radio. Software defined radio is a concept that GNU Radio has harnessed to allow developers to quickly create flexible radio designs. In terms of hardware, the maturity of FPGAs give radio designers new opportunities to develop high-speed radios having high-throughput and low-latency, yet the convent

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12

Finlay, Chris. "Radio Frequency Interference: Simulations for Radio Interferometry Arrays." Master's thesis, Faculty of Science, 2021. http://hdl.handle.net/11427/33716.

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Radio Frequency Interference (RFI) is a massive problem for radio observatories around the world. Due to the growth of telecommunications and air travel RFI is increasing exactly when the world's radio telescopes are increasing significantly in sensitivity, making RFI one of the most pressing problems for astronomy in the era of the Square Kilometre Array (SKA). Traditionally RFI is dealt with through simple algorithms that remove unexpected rapid changes but the recent explosion of machine learning and artificial intelligence (AI) provides an exciting opportunity for pushing the state-of-the-

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13

Lim, Christopher. "Optimizing access radio in multi-radio mesh network /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CSED%202009%20LIM.

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14

Orth, Erika Elisabeth. "Ein Grundrecht auf Umweltschutz in Europa? : eine rechtsdogmatische Einordnung des Art. 37 GRC /." Frankfurt am Main ; New York : P. Lang, 2007. http://www.wdr.de/radio/wdr2/.

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15

Mitola, Joseph. "Cognitive radio." Doctoral thesis, KTH, Teleinformatics, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2987.

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16

Meyer, Jens-Uwe. "Radio-Strategie." Konstanz : UVK Verlagsgesellschaft, 2007. http://www.gbv.de/dms/ilmenau/toc/528374737.PDF.

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17

Maier, Benjamin. "Radio poetry." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675850.

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This thesis is a creative and critical exploration of "radio poetry" -poems commissioned and produced for radio transmission, which utilise a verse-script, sound effects, music and other sonic materials as part of their poetic make-up. It argues that radio poetry has been overlooked in both literary criticism and radio studies, because of the ephemerality and ubiquity of its medium, and on account of the absence of a fully developed critical framework for its analysis. The thesis is intended to redress such a lack, and to outline the potential of radio poetry as a mode of sono-poetic expressio

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18

Egargo, Fernando Navidad. "Community radio strategies for participatory community building and development : a descriptive case study of selected community radio stations in the Philippines /." Roma : Pontifical Gregorian university, 2006. http://catalogue.bnf.fr/ark:/12148/cb411662241.

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19

Müller, Sven Archibald Hubertus. "Dust in radio quiet quasars, ultra luminous infrared galaxies, radio galaxies and radio loud quasars." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962893366.

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20

Jerbi, Amir. "Radio implementation of a testbed for cognitive radio source localization using USRPS and GNU radio." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/43932.

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Approved for public release; distribution is unlimited<br>The shift from wired to fully wireless communication is causing an increasing demand on the frequency spectrum. The cognitive radio was introduced to solve spectrum scarcity by allowing spectrum sharing between licensed and unlicensed users. This approach presents a challenge to source localization because of the cognitive radio’s capability to shift its spatial, frequency and temporal parameters. The extended semi-range-based (ESRB) and cooperative-received-signal-strength-based (CRSSB) localization schemes are proposed to overcome the

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21

Stoneman, Timothy H. B. "Capturing Believers: American International Radio, Religion, and Reception, 1931-1975." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/10415.

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Capturing Believers provides a history of the reception of American conservative evangelical missionary broadcasting from its inception in 1931 through the rise of the commercial era in 1970. The dissertation narrates accounts of two major Protestant stations, HCJB and ELWA, located in Ecuador and Liberia, respectively, as well as the U.S.-based project to build a custom transistor radio for the mission field. Employing a case-study approach, the thesis demonstrates the innovativeness of religious broadcasters who formulated a range of pragmatic responses to the drastic shortage of receiving s

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22

Taylor, Randy Lyle. "Radio networks and the redefinition of local private radio." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0001/MQ37643.pdf.

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23

Pratt, Jason Michael. "A software defined radio for research into cognitive radio." Diss., Rolla, Mo. : University of Missouri-Rolla, 2007. http://scholarsmine.mst.edu/thesis/pdf/Pratt2_09007dcc8049b35e.pdf.

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Thesis (M.S.)--University of Missouri--Rolla, 2007.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed December 7, 2007) Includes bibliographical references (p. 171-173).

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24

Coley, Samuel John. "Freelance radio practices : producing music documentaries for commercial radio." Thesis, Birmingham City University, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.758576.

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This study considers the practice of freelance radio producers creating music documentaries for commercial radio audiences. Commercial radio is an underexplored field of study, while investigations into music documentary content for commercial broadcasters are even more uncommon. Previous inquiries into radio documentary production have focused on public service models of broadcasting. These studies often view the subject from a journalistic agenda, overlooking technical approaches and ignoring the commercial imperatives that inform freelance practices. I explore how advances in digital produc

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25

Abozariba, Raouf. "Generalised radio resource sharing framework for heterogeneous radio networks." Thesis, Staffordshire University, 2017. http://eprints.staffs.ac.uk/4197/.

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Recent years have seen a significant interest in quantitative measurements of licensed and unlicensed spectrum use. Several research groups, companies and regulatory bodies have conducted studies of varying times and locations with the aim to capture the over- all utilisation rate of spectrum. The studies have shown that large amount of allocated spectrum are under-utilised, and create the so called "spectrum holes", resulting in a waste of valuable frequency resources. In order to satisfy the requirements of increased demands of spectrum resources and to improve spectrum utilisation, dynamic

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26

Postlethwait, Ben C. "The New Radio: How Public Radio Became Journalistic Podcasting." Ohio University Honors Tutorial College / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1462981143.

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27

Modiba, Benjamin Maboke. "Radio Turf as a community radio station :empowerment possibilities." Thesis, University of Limpopo, 2002. http://hdl.handle.net/10386/2965.

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Thesis (M.A.(Media Studies)) --University of the North, 2002<br>This research report looks at Radio Turf as a radio station serving the university community as well af the neighbouring communities. It seeks to establish whether Radio Turf is indeed an empowering tool to the community it serves, looking at language usage, skills development, promotion of local music, gender issues and education. It further seeks to establish whether it is indeed a community radio station in the true sense of the word. The research report lso looks at ways and means of improving community radio stations in gener

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28

Mariani, Giulia. "Interpretare per la radio – il caso di Hollywood Party su Radio3." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19560/.

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In questo elaborato sono state analizzate dieci interviste ad alcuni ospiti stranieri francofoni condotte nell’ambito della trasmissione Hollywood Party dell’emittente radiofonica Radio3. Il primo capitolo si apre con una breve descrizione delle caratteristiche inerenti all’attività dell’interprete, e dopo aver descritto le modalità interpretative, affronta alcuni concetti e principi di base dell’interpretazione per i mass media. Vengono descritti i particolari setting dell’interpretazione per i media e le specifiche competenze necessarie per garantire al pubblico un servizio fruibile e soddis

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29

Scaperoth, David Alan. "Configurable SDR Operation for Cognitive Radio Applications using GNU Radio and the Universal Software Radio Peripheral." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/32961.

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With interoperability issues plaguing emergency responders throughout the country, Cognitive Radio (CR) offers a unique solution to streamline communication between police, Emergency Medical Technicians (EMT), and military officers. Using Software Defined Radio (SDR) technology, a flexible radio platform can be potentially configured using a Cognitive Engine (CE) to transmit and receive many different incompatible radio standards. In this thesis, an interface between a Cognitive Engine and an SDR platform is described which modifies (i.e., configures) the radioâ s operation. The interface

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30

Hall, Margaret A. "Radio after radio : redefining radio art in the light of new media technology through expanded practice." Thesis, University of the Arts London, 2015. http://ualresearchonline.arts.ac.uk/8748/.

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I have been working in the field of radio art, and through creative practice have been considering how the convergence of new media technologies has redefined radio art, addressing the ways in which this has extended the boundaries of the art form. This practice-based research explores the rich history of radio as an artistic medium and the relationship between the artist and technology, emphasising the role of the artist as a mediator between broadcast institutions and a listening public. It considers how radio art might be defined in relation to sound art, music and media art, mapping its sh

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31

Nono, Njepang Luidor. "Les radios communautaires au Cameroun." Thesis, Paris 2, 2012. http://www.theses.fr/2012PA020051.

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L’ouverture du secteur audiovisuel camerounais a consacré l’avancée du processus d’acquisition et de l’octroi des libertés individuelles commencé autour des années 1990. Le décret d’application d’avril 2003 a entériné une dizaine d’années plus tard, le dispositif enclenché par la loi n°90-052 du 19 décembre 1990 relative à la liberté de communication sociale. Depuis lors, organes de presse et audiovisuels se côtoient et se heurtent à des pesanteurs susceptibles de limiter leur efficacité, en tant qu’outils et moyens de communication de proximité. Leur jeunesse, les problèmes endogènes et exogè

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32

Suliman, I. M. (Isameldin Mohammed). "Performance analysis of cognitive radio networks and radio resource allocation." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212753.

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Abstract Cognitive radio (CR) is becoming a promising tool for solving the problem of the scarce radio resource and spectrum inefficiency. Spectrum sensing (signal detection) enables real-time detection of spectrum holes by unlicensed secondary users (SUs) in cognitive radio networks (CRNs). In this thesis, performance analysis of CRNs and radio resource allocation are considered. A continuous time Markov chain (CTMC) based analytical model taking into account all relevant elements as well as addressing the issue of the false alarm rate (FAR) associated with the continuous sensing is developed

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33

Vernstrom, Tessa. "Contribution to the diffuse radio background from extragalactic radio sources." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/37898.

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We examine the brightness of the Cosmic Radio Background (CRB) by comparing the contribution from individual source counts to absolute measurements. We use a compilation of radio counts to estimate the contribution of detected sources to the CRB in several different frequency bands. Using a Monte Carlo Markov Chain technique, we estimate the brightness values and uncertainties, paying attention to various sources of systematic error. At n = 150MHz, 325MHz, 408MHz, 610MHz, 1:4GHz, 4:8GHz, and 8:4GHz our calculated contributions to the background sky temperature are 18, 2.8, 1.6, 0.71, 0.11, 0.0

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34

Bracht, Roger, Jeff Dimsdle, Dave Rich, and Frank Smith. "RADIO FREQUENCY OVERVIEW OF THE HIGH EXPLOSIVE RADIO TELEMETRY PROJECT." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607352.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>High explosive radio telemetry (HERT) is a project that is being developed jointly by Los Alamos National Laboratory and AlliedSignal FM&T. The ultimate goal is to develop a small, modular telemetry system capable of high-speed detection of explosive events, with an accuracy on the order of 10 nanoseconds. The reliable telemetry of this data, from a high-speed missile trajectory, is a very challenging opportunity. All captured data must be t

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35

Nahra, Cintia Maria Leite. "Radio institucional e radio livre : rupturas no modelo comunicacional dominante." reponame:Repositório Institucional da UFSC, 1988. https://repositorio.ufsc.br/handle/123456789/111941.

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36

Hope-Hume, Bob. "Radio, community and the public : Community radio in Western Australia." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 1997. https://ro.ecu.edu.au/theses/889.

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This thesis examines community radio in Western Australia and its relationship to "the public sphere". The public sphere is that field in which private. persons interact with other private. persons and in so doing construct a 11public". Public opinion is formed through this interaction in the public sphere. The media provide a major part of that interaction. Moreover, the media determine which voices are privileged within the communicative sphere. Drawing from Jurgen Habennas I explore theories of the public sphere arguing that community radio constructs a new form of public sphere in contempo

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37

Liu, Hexin. "Radio sur fibre : réseaux, couvertures radio, architectures et dimensionnements matériels." Télécom Bretagne, 2013. http://www.telecom-bretagne.eu/publications/publication.php?idpublication=13211.

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L'objectif de la thèse est d'étudier un système d'antennes distribuées radio sur fibre pour le WLAN IEEE802. 11g OFDM à 2. 45 GHz. A partir de modèles et de caractéristiques de la chaîne optique, nous avons déduit les limitations d'un tel système pour en déduire des solutions techniques. Le niveau du facteur de bruit de la liaison est élevé, tout comme son point de compression est assez faible, et cela entraîne une dynamique assez faible. Compte tenu que nous maîtrisons les niveaux des signaux, le lien descendant se comporte correctement. Pour le lien montant, et avec des circuits optoélectron

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38

Selma, Martín Fernando. "Radio Environment Improvement." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4746.

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<p>Mobile communications are a changing and really competitive market. Companies try to release new products and upgrade the old ones as soon as possible. And in this context it is where Ericsson Test Environment makes available to its customer one of the most comprehensive GSM test environments in the world.</p><p>The test site at customer disposal provides a good environment for testing purpose and it allows them to improve and develop their products in really interesting time terms.</p><p>To make this possible, a huge GSM network is enclosed inside its facilities and this entails some probl

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Manicka, Naveen. "GNU Radio testbed." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 104 p, 2007. http://proquest.umi.com/pqdweb?did=1338919411&sid=4&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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40

Cordey, R. A. "Nearby radio galaxies." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356676.

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Shepherd, Mark. "Radio channel assignment." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288047.

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Fraser, Simon G. "Fibre radio transceivers." Thesis, University of Leeds, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406200.

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Wassell, Ian J. "Digital mobile radio." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277683.

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Maciel, Tamela. "Radio source evolution." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708637.

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45

Alhasan, Raghda. "Software defined radio." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-53361.

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Software Defined Radio (SDR) technology is used to receive and transmit radio signals. Radio signals can be received using the SDR_sharp software that can be downloaded to a personal computer and combined with the RTL-SDR dongle hardware that is connected to the computer. This report gives a brief explanation of the SDR receiver, the supported software, and some applications that can be implemented with SDR. Moreover, it is shown how to install the SDR_sharp software and the hardware Zadig. After installation, wideband FM (WFM) reception and adjustment of RF gain and frequency error is illustr

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46

Borén, P. (Pietu). "Radio-ohjattava nelikopteri." Bachelor's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201602101154.

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Tässä kandidaatintyössä tutkitaan ja esitetään radio-ohjattavan nelikopterin lentoteoriaa sekä teknistä toimintaa. Lisäksi työssä esitetään yhden radio-ohjattavan nelikopterin rakentaminen ja siihen liittyvien komponenttien ja materiaalien valinnat perusteluineen. Tutkimustietoa kerättiin kirjallisuuslähteistä sekä tehtiin empiiristä tutkimusta radio-ohjattavan nelikopterin rakentamisen yhteydessä. Työssä todetaan valitut komponentti ja materiaaliratkaisut toimiviksi ja radio-ohjattava nelikopteri lentokelpoiseksi<br>The purpose of this bachelor’s work is to study and present a flight theory a

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Preston, Jon. "Voice in radio." Thesis, Goldsmiths College (University of London), 2017. http://research.gold.ac.uk/20190/.

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“Voice in Radio” is a practice-based thesis. It reflects on a series of participatory media projects involving community groups and secondary school students working together to produce radio shows. The thesis offers an analysis of those projects through the academic prism of ‘voice’, a term defined in both the personal and socio-political senses. Further, it reflects on the possibilities for voice offered by Participatory Community Radio (PCR) practice. Having devised and led this practice, I occupy the position of a ‘reflexive practitioner’ in the study. The thesis is presented as a linear n

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Silva, Mário Marques da. "Emergent Radio Systems." Doctoral thesis, Instituto Superior Técnico, 2005. http://hdl.handle.net/11144/350.

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Emergent services are demanding higher data rates, especially in the downlink. Wideband Code Division Multiple Access (WCDMA) is the key to reach this development in cellular communications. To obtain this, it is important to find schemes able to reduce Inter-Path Interference (IPI) and Multiple Access Interference (MAI), and to explore new types of diversity. These are the objectives of the present thesis. Interference cancellation subject considers post-processing and pre-processing schemes. A new linear Multi-User Detector (MUD) is proposed and analyzed. As pre-processing schemes, the new

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Hussain, Sajjad. "PEAK TO AVERAGE POWER RATIO ANALYSIS AND REDUCTION OF COGNITIVE RADIO SIGNALS." Phd thesis, Université Rennes 1, 2009. http://tel.archives-ouvertes.fr/tel-00426930.

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* La multiplication des standards de télécommunications fait apparaître la nécessité de disposer de terminaux multistandard et reconfigurables. Ces nouvelles fonctionnalités trouvent leurs réponses dans le domaine de la radio logicielle. De tels terminaux ne sont pas encore réalisables pour des raisons technologiques liées à la complexité nécessaire à leur réalisation (convertisseurs ultra rapides, processeurs reconfigurables, antennes et amplificateurs très large bande, ....). En se basant alors sur une véritable technologie radio logicielle, la radio intelligente va encore plus loin dans la

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50

Kunselman, Gary L. "Radio frequency power amplifiers for portable communication systems." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/41493.

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<p>Portable communication systems require, in part, high-efficiency radio frequency power amplifiers (RF PA) if battery lifetime is to be conserved. Conventional amplifier classifications and definitions are presented in a unified and concise format. The Bipolar Junction Transistor (BJT) and Metal-Semiconductor Field Effect Transistor (MESFET) are evaluated as active devices in high-efficiency RF PA designs. Two amplifier classes (class CE and class F) meet the system requirements of an 850 MHz operating frequency, a power output of 3 W, a battery supply voltage of 9 Vdc, and a sinusoidal-type

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