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Roza, Erick Andre. "Net-ativismo: comunicação e mobilização em contextos reticulares." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/27/27152/tde-20052013-151543/.
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O trabalho realiza um percurso entre as teorias da ação coletiva e da comunicação digital para produzir uma reflexão sobre os significados da mobilização em contextos reticulares, ou net-ativismo. A partir das teorias apresentadas tentaremos organizar uma linha de interpretação que faça convergir esses dois campos para o entendimento do que vem a ser net-ativismo para que depois possamos realizar dois propósitos: primeiro, apresentar um mapa das principais ações de net-ativismo no Brasil e no Mundo. Segundo, contribuir para o desenvolvimento de uma teoria da ação que contemple as formas de mobilização net-ativistas entendendo seu significar e sua relação com as formas convencionais de ação política.The thesis follows a path between the theories of collective action and digital communications to develop an analysis of the meanings of mobilization in reticular contexts or net-activism. Based on the presented theories we will try to arrange a line of interpretation that makes those two fields converge to the understanding of the meaning of net-activism so that, afterwards, we can achieve two purposes: first, present a map of the main net-activism\'s actions in Brazil and around the world. Then, contribute to the development of a theory that beholds the different approaches of mobilizations net-activists to understand their meaning and their relation to the conventional approaches of political action.
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Poirrier, Julien. "Electronic Mitigation of Polarization Mode Dispersion." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34469.
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Polarization Mode Dispersion induces polarization dependent propagation. Consequently it generates a multiple imaging of the light pulse carrying the information. Its first order appears as a dual path fading channel of Maxwellian statistics. It results in harmful impairments that prevent the upgrade and installation of high bit-rate systems. The random process PMD exhibits a strong frequency dependence, so that its amelioration requires channel by channel, non-linear, adaptive mitigation. Electronic mitigation appears as a very attractive solution to overcome the limit set by the PMD.
Consequently, we considered the implementation of these solutions at the receiver in the electrical domain. We verified that these linear and non-linear equalization techniques can greatly reduce the power penalty due to PMD. Equalization's performance depends highly on the type of systems considered. For the two main types of systems: thermal noise limited systems and systems exhibiting ASE (systems using optical amplifiers), we demonstrated and quantified the induced improvement (measured as power penalty reduction). The most sophisticated technique that we considered (NLC+FDE) handles any kind of first order PMD within a 4 dB margin in the thermal noise limit. This extended to a 11 dB margin in the presence of ASE. This comes from the limitation set by the signal dependence of the noise. In fact, these DSP techniques do a better job at reducing very high penalty. Consequently, for a power and ISI limited link, it may be required to associate to electronic solutions optical compensation in order to reach acceptable performance. On the other hand, for links having large power margin or exhibiting reasonable PMD, electronic techniques appear as an easy, inexpensive and convenient solution.
We derived in this work the bounds to NLC performance in the presence of ASE. Therefore, we extended the usual results of the thermal noise limit to the particular case of signal dependent noise. We also made clear that optical systems, because of their noise specificities can not be studied or designed as others links. Notions such as eye opening, SNR and ISI need to be carefully defined and adapted to this case.
We have provided in this work PMD dependent power penalty map for known systems. Given the link's statistics and characteristics, one can determine, following our structure, which mitigation techniques allow upgrade.Master of Science
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Rugbeer, Hemduth. "Communicating by ordering electrons : the development of electronic communication as part of a secondary school Communication Science curriculum in the Language, Literacy and Communication learning area." Thesis, University of Zululand, 2001. http://hdl.handle.net/10530/314.
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A thesis submitted in fulfilment of the requirements for the Degree of MA in Communication Science, University of Zululand, 2001.In this thesis I focus on the introduction of Electronic Cornmunication as part of an envisaged Communication Science curriculum in the Language, Literacy and Communication Learning area of the Further Education and Training band. In the course of my thesis I will show that the requisite elements of verbal and written cornmunication are dispersed throughout the Language, Literacy and Communication learning area in the General Education and Training band, and that they can be utilised as basis for formally introducing Communication Science, as a subject in the Language, literacy and Communication learning area in the Further Education and Train¬ing band. I also show that electronic communication will form a crucial area of study in such a Communication Science curriculum. I argue that due to the diversity of cultures in South Africa, cross-cultural cornmunication is required in such a curriculum. I also argue that by the very na¬ture of Outcomes-Based Education it is necessary to have a subject into our school curriculum that will form an interface with conceptual learning and experiential learning, that will contextu-alise language study within the more comprehensive scope of forms of human communication, and that will form an interface between the humanities and science to prevent the humanities from becoming soft options in Further Education and Training band learning programmes. To this effect I focus on the crucial role of Constructivism as integrating theory to account for vari¬ous approaches to motivational learning, the primary form of learning required in Outcomes-Based Education. I examine the principles of curriculum construction in OBE and its associated culture of learn¬ing against the backdrop of the theory of Situated Cognition. This presents a platform to argue the case for Electronic Communication as part of Communication Science in the Further Edu¬cation and Training band curricula in South African schools.
National Research Foundation
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Rockliff, Simon C. "Frequency hopping techniques for digital mobile radio /." Title page, contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phr683.pdf.
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Lahey, Michael. "Soft control| Television's relationship to digital micromedia." Thesis, Indiana University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3607011.
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This dissertation explores the role soft control plays in the relationship between the television industry and short forms of digital media. Following James Beniger and Tizianna Terranova, I define soft control as the purposive movement by the television industry towards shaping audience attention toward predetermined goals through a range of interactions where development happens somewhat autonomously, while being interjected with commands over time. I define such things as media environment design, branding, and data collection as soft control practices. I focus on television as a way to understand how an industry historically patterned around more rigid forms of audience control deals with a digital media environment often cited for its lack of control features. And while there is already a robust discussion on the shifting strategies for the online distribution of shows, there is less of a focus on the increasing importance of shorter forms of digital media to the everyday operation of the television industry. Shorter forms of media include digitally circulated short videos, songs, casual digital games, and even social media, which is itself a platform for the distribution of shorter forms of media. I refer to all these forms of short media as "micromedia" and focus my interest on how various television companies are dealing with media environments saturated with it.
To do this I look at, for instance, how television companies use the data available on Twitter and appropriate the user-generated content of audiences, as well as how standard digital communication interfaces are utilized to more easily retrofit previous audience retention practices into new digital environments. Through the investigation of how television creates and appropriates micromedia as a way to reconfigure practices into the everyday lives of participatory audiences, I argue that we can see soft control elements at work in structuring the industry-audience relationship. These soft control features call into question the emancipatory role attributed to participatory audiences and digital technologies alike. If we think about media forms in their specific contexts, making sure to focus on their intermedial connections and their materiality, we can complicate ideas about what the categories of audience or industrial control mean.
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D'Aiello, Alan. "Communicating in the local : digital communications technology use in Brighton's gay pub scene." Thesis, University of Sussex, 2016. http://sro.sussex.ac.uk/id/eprint/61485/.
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This thesis is an analysis of the use and impact of digital communication technology (DCT) in the Gay pub scene in the Kemptown neighborhood of Brighton, East Sussex, UK. The purpose of this work is twofold: to create a snapshot record of the everyday activities in pub spaces at a particular point in the neighborhood's history from the point of view of an American gay man, and to develop an understanding of the impact of digital communications technology (DCT) on the activities in these spaces by investigating the impact of DCT on the idea of 'gay space'. This analysis is broken down into three distinct areas of enquiry: the implementation of DCT in pub spaces by the landlords/owners of the space, the use of DCT by the patrons of these spaces, and an analysis of those spaces that have not directly engaged DCT, neither implementing DCT as a feature of the location, nor limiting its use within the space. This thesis utilizes participant observations, auto ethnographic observations, and interviews made over a period of two years and engages with the theoretical arguments around gay space: its history both within the broad context of UK history, and also with Brighton's special historical status as a gay centre within the UK; its current uses; and the potential for its evolution. This investigation of hof DCT is impacting on gay space also questions to what extent 'gay space' is maintaining a sense of physicality and to what extent an extension of DCT-enabled virtual spaces is altering our relationship to these spaces. The work examines the notion of nostalgia, ownership, and control of space and attempts through its focus on several locations in Kemptown to catalogue the many changes in structure, clientele, locale, and business success that these spaces have gone through in a fairly short time and to determine to what extent the use and influences of DCT has driven these changes. The project includes interviews with landlords and patrons of eight current and former venues in Kemptown and encompasses a group of three key participants in detail through a series of scheduled interviews and group discussions conducted during the duration of the project, and details their particular relationships to the spaces in Kemptown as well as their uses of DCT in these spaces. These participants act as a focal point for the research by helping to create a frame of reference within the work balancing the author's auto ethnographic analysis with the point of view of a local Brighton gay male, as well as contribute to and support the broader narrative of the vicissitudes of smaller pub venues by helping to highlight the historical changes in the pubs being looked at. The specific questions that this research sets out to answer are: • How is digital communicative technology (DCT) affecting self defined gay spaces in Kemptown, Brighton? • How is DCT affecting the behaviours of the patrons and owners/operators in these spaces? • How are the owners/operators of these spaces adapting to DCT? Is there evidence of owners/operators conforming to Winston's theory on the suppression of disruptive potential of new and emerging media technology (1995)? • What are the implications, challenges and opportunities presented to those spaces which are not engaging with DCT in their spaces? • Are “gay spaces” in Kemptown still relevant with the intersection of digital and physical spaces? Do these spaces meet the same requirements as they have in the past? Does DCT have the ability on its own to maintain the relevance of a venue on its own when faced off against other pressures (such as commercial or demographic pressure)? The conclusions reached in this thesis draw attention to the potential for DCT: • Acting as a form of disruptive potential of new communication technologies (Winston, 1995). • The concerns that DCT is suppressing interpersonal communications in favor of mediated discourse (Turkle, 2011, 2012, 2015). • That automobility is creating a privatization of pub spaces, along with the creation of ‘non-places' (Bull, 2004) However, in the author's analysis, there is evidence of cohabitation, and adaptation towards DCT which is reminiscent of Winston's theory of the suppression of disruptive potential of emerging communication technology, as well as a resistance response with nostalgic overtones. The conclusions are also grounded in the larger narratives of pub culture within the UK and note the challenging culture that smaller, brewer-tied and non-tied gay venues have within these changing demographics and cultural acceptance of homosexuality in general. This research adds to the broader field of research into the adaptation of communications technology by drawing attention to the effects of DCT on both spaces and their users and also highlights their effects on a subculture.
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Oredsson, Lindsey. "Communicating Responsibility : Audience reception of CSR communication on social media." Thesis, Stockholms universitet, Institutionen för mediestudier, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-104697.
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This study offers insight into international audience reception of Corporate Social Responsibility (CSR) communication. Swedish companies are currently reaching international audiences through a variety of social media channels and this study analyzes how audiences in Sweden and the U.S. respond to specific messages. Qualitative interviews with professionals offer background information on how CSR is currently communicated while audience responses to CSR communication are gathered through a web-based survey and focus groups consisting of American and Swedish citizens. Results indicate that the two countries have more similarities than differences. Americans have a slightly more positive outlook on the communication and they are more likely to look up information about CSR initiatives after hearing a corporate message. This might indicate a more profound interest. Cultural and social differences are given as a possible explanation for the key differences.
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Rintala, Maja. "Democratic participation on digital conditions : communication challenges and opportunities for collective action organizations." Thesis, Umeå universitet, Institutionen för kultur- och medievetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-185462.
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This thesis examines how communication technology is used for creating a democratic and committed participation within collective action organizations (CAOs). This is achieved by illuminating how organizations' structure and culture relate to their communication. It’s done by in-depth interviews with network-based movements and association-based organizations, and analyses of their digital newsletters. The analysis is based on affordance-driven theory, capturing the interaction between organizations and their digital platforms. The focus lies on how internal democracy and collective action are afforded or constrained to some degrees. Degrees of deliberation for creating common ground and active participation are made visible by using the concept of communicative action. Theories within social movement studies, such as collective action, broaden the understanding of how the perception of digital tools shapes and is shaped by their structure and culture. The results show that the usage and coordination of communication channels is essential for the practice of internal democracy in everyday work, beyond annual meetings and board meetings. Independent chat-based platforms enable an increased control of conversations, cooperation and coordination, while information overload and effective decision- making processes can hinder democratic participation. Commercial social media platforms such as Facebook enables new flows of engagement and connectivity but constrains coordination and control of the framing process within Facebook groups. Additionally, unpredictable algorithms and advertising policy on Facebook makes it difficult to reach out. Overall, the study suggests a broadened view of communication, where communication and usage of digital media should not be considered as instrumental entities. Rather, it is strongly related to how channels are being coordinated, how organizations are organized and the view of participation. Formal structures can both hinder and enable increased communicative action that contributes to democratic participation.
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Michaels, Alan Jason. "Digital chaotic communications." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/34849.
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This dissertation provides the conceptual development, modeling and simulation, physical
implementation, and measured hardware results for a practicable digital coherent chaotic
communication system. Such systems are highly desirable for robust communications due to
the maximal entropy signal characteristics that satisfy Shannon's ideal noise-like waveform
and provide optimal data transmission across a flat communications channel. At the core of
the coherent chaotic communications system is a fully digital chaotic circuit, providing an
efficiently controllable mechanism that overcomes the traditional bottleneck of chaotic circuit
state synchronization. The analytical, simulation, and hardware results yield a generalization of direct sequence spread spectrum waveforms, that can be further extended to create a new class of maximal entropy waveforms suitable for optimized channel performance, maximal entropy transmission of chaotically spread amplitude modulated data constellations, and
permission-based multiple access systems.
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Sen, Cem. "Digital communications jamming." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA383913.
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Thesis (M.S. in Systems Engineering) Naval Postgraduate School, Sept. 2000.Thesis advisor(s): Smith, Rasler W.; Lebaric, Jovan. Includes bibliographical references (p. 137-139). Also available online.
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Lo, Chi-ming. "Analytical evaluation of wireless digital communication performance over fading channels." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23295211.
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Katz, Ettie. "Trellis codes for multipath fading ISI channels with sequential detection." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/13908.
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Malan, Estian. "Multi-dimensional direct-sequence spread spectrum multiple-access communication with adaptive channel coding." Pretoria : [S.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-10252007-142715/.
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鄭价昌 and Kai-cheong Chang. "Adaptive channel equalisation technique for wideband time-division multiple access digital mobile radio communications systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31212888.
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Chang, Kai-cheong. "Adaptive channel equalisation technique for wideband time-division multiple access digital mobile radio communications systems /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17590371.
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Iyer, Gopal Balakrishnan. "Digital communication and control circuits for 60ghz fully integrated CMOS digital radio." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/39589.
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Emerging "bandwidth hungry" applications such as high definition video distribution and ultra fast multimedia side-loading have extended the need for multi-gigabit wireless solutions beyond the reach of conventional WLAN technology or even more recently emerging UWB and MIMO systems. The availability of 7GHz of unlicensed bandwidth in the 60GHz spectrum, represents a unique opportunity to address such data-throughput requirements. The 60GHz Integrated CMOS digital radio chipset comprises of PHY and MAC layers, RF transceiver, High-Speed Digital Interface and an underlying Serial Communication Fabric.
To have a complete communication solution compliant with the latest ECMA-369, ISO/DIS 13156 and IEEE 802.15.3c standards, we build a million gate digital implementation of MAC and PHY. The Serial Peripheral Interface (SPI) serves as the bridge between the higher layers in the communication stack (PAL-MAC) and the lower layers like PHY-RF Front End. The MAC module can setup the communication link on the fly by tuning parameters such as operating channel, channel bonding and bandwidth, data rates, error correction mechanisms, handshaking mechanisms, etc, by using the SPI to communicate with internal components. The SPI interface plays a crucial rule in not only this, but also during the testing and debug phase. Operation of each of the RF modules is monitored through the serial interface using local SPI slaves which are hooked up to the 4-wire serial bus running all through the chip. The SPI host controller emulates an embedded protocol analyzer. For calibration and fine tuning purposes, digital settings can also be loaded onto these modules through the SPI interface. R-2R DACs are used to convert these commands into analog voltages which then provide a tunable bias to the RF and mixed-signal modules. Other key functions of this serial communication and control interface are: Initialization of all of the RF and mixed signal modules, DC calibration of data converter, PLL and other mixed-signal modules, data acquisition, parametric tuning for digital modules such as linear equalizer, Gain Control loops (AGC, VGA), etc.
Ultra high speed digital Input-Output buffers are used to provide an external data interface to the radio chipset. These high speed I/Os are also used in the gbps (gigabit-per-second) link for data transfer between the RF transceiver chip and the PHY-MAC baseband chip. The IOs are expected to comply with different signaling standards such as LVDS, SLVS200, SLVS400, etc. A robust system involves a meticulous pad ring design with proper power domains and power cuts. Full-chip integration of the digital PHY, MAC, peripheral logic and IO ring is done in a semi-custom fashion.
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Crisafi, Anthony F. "Outside the frame towards a phenomenology of texts and technology /." Orlando, Fla. : University of Central Florida, 2008. http://purl.fcla.edu/fcla/etd/CFE0002181.
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Maciejewski, Robert. "Privacy aspects of digital communication." St. Gallen, 2007. http://www.biblio.unisg.ch/org/biblio/edoc.nsf/wwwDisplayIdentifier/01665892002/$FILE/01665892002.pdf.
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Jiang, Xiaofeng. "Multipoint digital video communications." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239548.
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Yin, Hujun. "Cross layer design and optimization of wireless networks /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/5904.
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Hum, Eddy N. (Eddy Ning) Carleton University Dissertation Engineering Electrical. "Burst-trapping codes for the land mobile data channel." Ottawa, 1988.
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Todd, Stephen Ross Carleton University Dissertation Engineering Electrical. "Empirical evaluation of diversity techniques for indoor digital radio at 1.75 GHz." Ottawa, 1992.
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Boiyo, Duncan Kiboi, and Romeo Gamatham. "Optimization of flexible spectrum in optical transport networks." Thesis, Nelson Mandela Metropolitan University, 2017. http://hdl.handle.net/10948/14609.
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The ever-increasing demand for broadband services by end-user devices utilising 3G/4G/LTE and the projected 5G in the last mile will require sustaining broadband supply from fibre-linked terminals. The eventual outcome of the high demand for broadband is strained optical and electronic devices. The backbone optical fibre transport systems and techniques such as dense wavelength division multiplexing (DWDM), higher modulation formats, coherent detection and signal amplification have increased both fibre capacity and spectrum efficiency. A major challenge to fibre capacity and spectrum efficiency is fibre-faults and optical impairments, network management, routing and wavelength assignment (RWA). In this study, DWDM and flexible spectrum techniques such as wavelength assignment and adjustment, wavelength conversion and switching, optical add and drop multiplexing (OADM) and bitrate variable transmission have been experimentally optimized in a laboratory testbed for short- and long-haul optical fibre networks. This work starts by experimentally optimising different transmitters, fibre-types and receivers suitable for implementing cost effective and energy efficient flexible spectrum networks. Vertical cavity surface-emitting lasers (VCSELs) and distributed feedback (DFB) lasers have been studied to provide up to 10 Gb/s per channel in 1310 nm and 1550 nm transmission windows. VCSELs provide wavelength assignment and adjustment. This work utilises the non-return-to-zero (NRZ) on-off keying (OOK) modulation technique and direct detection due to their cost and simplicity. By using positive intrinsic negative (PIN) photo-receivers with error-free BER sensitivity of -18±1 dBm at the acceptable 10-9-bit error rate (BER) threshold level, unamplified transmission distances between 6 km and 76 km have been demonstrated using G.652 and G.655 single mode fibres (SMFs). For the first time, an all optical VCSEL to VCSEL wavelength conversion, switching, transmission at the 1550 nm window and BER evaluation of a NRZ data signal is experimentally demonstrated. With VCSEL wavelength conversion and switching, wavelength adjustments to a spectrum width of 4.8 nm (600 GHz) can be achieved to provide alternative routes to signals when fibre-cuts and wavelength collision occurs therefore enhancing signal continuity. This work also demonstrates a technique of removing and adding a wavelength in a bundle of DWDM and flexible channels using an OADM. This has been implemented using a VCSEL and a fibre Bragg grating (FBG) providing a wavelength isolation ratio of 31.4 dB and ~0.3 𝑑𝐵 add/drop penalty of 8.5 Gb/s signal. As a result, an OADM improves spectrum efficiency by offering wavelength re-use. Optical impairments such as crosstalk, chromatic dispersion (CD) and effects of polarization mode dispersion (PMD) have been experimentally investigated and mitigated. This work showed that crosstalk penalty increased with fibre-length, bitrate, interfering signal power and reduced channel spacing and as a result, a crosstalk-penalty trade-off is required. Effects of CD on a transmitted 10 Gb/s signal were also investigated and its mitigation techniques used to increase the fibre-reach. This work uses the negative dispersion fibres to mitigate the accumulated dispersion over the distance of transmission. A 5 dB sensitivity improvement is reported for an unamplified 76 km using DFB transmitters and combination of NZDSF true-wave reduced slope (TW-RS) and submarine reduced slope (TW-SRS) with + and – dispersion coefficients respectively. We have also demonstrated up to 52 km 10 Gb/s per channel VCSEL-based transmission and reduced net dispersion. Experimental demonstration of forward Raman amplification has achieved a 4.7 dB on-off gain distributed over a 4.8 nm spectral width and a 1.7 dB improvement of receiver sensitivity in Raman-aided 10 Gb/s per wavelength VCSEL transmission. Finally, 4.25-10 Gb/s PON-based point to point (P2P) and point to multipoint (P2MP) broadcast transmission have been experimentally demonstrated. A 10 Gb/s with a 1:8 passive splitter incurred a 3.7 dB penalty for a 24.7 km fibre-link. In summary, this work has demonstrated cost effective and energy efficient potential flexible spectrum techniques for high speed signal transmission. With the optimized network parameters, flexible spectrum is therefore relevant in short-reach, metro-access and long-haul applications for national broadband networks and the Square Kilometre Array (SKA) fibre-based signal and data transmission.
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Marse, Michael Eugene, and Nicholas Negroponte. "A metaphoric cluster analysis of the rhetoric of digital technology." CSUSB ScholarWorks, 2005. https://scholarworks.lib.csusb.edu/etd-project/2928.
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This thesis seeks to identify and explain some technology in order to more fully understand modern communication. This study makes use of metaphoric cluster analysis to examine the technological rhetoric of Nicholas Negroponte.
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雷靜 and Jing Lei. "Frequency synchronization methods for digital broadband receivers." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31244427.
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Hwang, Yong Goo. "Optimal configuration of digital communication network." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA243041.
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Thesis (M.S. in Computer Science)--Naval Postgraduate School, December 1990.Thesis Advisor(s): Suh, Myung W. Second Reader: Hamming, Richard W. "December 1990." Description based on title screen as viewed on March 30, 2010. DTIC Identifier(s): Program Listings, Lagrangian Relaxation. Author(s) subject terms: Network, Langrangian Relaxation, Subgradient Optimization. Includes bibliographical references (p. 66-67). Also available in print.
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Qian, Xinben Garrison. "Adaptive systems in digital communication designs." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38821.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.Includes bibliographical references (leaves 98-100).
by Xinben Garrison Qian.
M.S.
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Gomes, Rui Miguel Soares. "Intelligent peripherals with digital communication bus." Master's thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/5563.
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Mestrado em Engenharia Electrónica e TelecomunicaçõesEsta dissertação é parte integral do projecto ECU2010 e é focada no desenvolvimento de Periféricos Inteligentes que são conectados à ECU através de um Barramento Digital de Comunicação. O projecto ECU2010 está centrado no desenvolvimento de uma nova arquitectura da unidade de controlo electrónico (ECU) para desporto automóvel, focada no controlo de motores de combustão interna. A arquitectura proposta deverá ser ter a capacidade de controlar um motor de combustão interna usando os mais modernos modelos de controlo, mas sendo baseada numa modelo de processamento distribuído, composta por módulos de processamento auto-suficientes ao nível de comunicações e armazenamento e de sensores/actuadores com inteligência capazes de processamento prévio de dados. A ênfase desta dissertação será colocada apenas nos Periféricos Inteligentes e no Barramento Digital de Comunicação. Este documento irá analisar e propor uma solução para a inclusão de capacidades de processamento, armazenamento e diagnóstico nos periféricos, assim como o desenvolvimento de um Barramento Digital de Comunicação que permite aos periféricos comunicarem com a ECU e sincronizarem-se com a rotação do motor.
This dissertation is an integral part of the ECU2010 project and is focused on the development of Intelligent Peripherals which connect to the ECU by means of a Digital Communication Bus. The ECU2010 project is centered on developing a new architecture of electronic control units (ECU) for motor sport, focussing on control of internal combustion engines. The proposed new architecture should be capable of controlling an internal combustion engine using the state-of-the art control models, but based on a distributed processing model consisting on self-sufficient processing modules in terms of communications, storage and intelligent enabled sensors/actuators, which is able to produce low-level data processing. The focus of this dissertation will only be the Intelligent Peripherals and the Digital Communication Bus. This document will analyse and propose a solution for the incorporation of processing, storage and diagnostic capabilities into peripherals, as well as the development of a Digital Communication Bus which allows the peripherals to communicate with the ECU and synchronize them with the engine’s rotation.
FCT; FSE
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Lashgari, Maryam. "Digital Marketing Strategy:B2B and Stakeholders Communication." Doctoral thesis, KTH, Skolan för industriell teknik och management (ITM), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-220144.
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Since digital media entered the business domain, many different tools and platforms have transformed the nature of business communications. This transformation has not been easy, since the journey has been accompanied by challenges from the marketers’ side against the adoption of the new platforms into the firm’s communication channels. Business to business marketers have also been engaged in such challenges by maintaining a slow adoption, which has motivated the researchers to study the adoption of different means and tools of digital communication in a business context. Through this research, I contribute by exploring the adoption strategies of digital platforms in the B2B supply chain including B2B firms, retailers and end users. By digital media, I mainly refer to social media and beacon technology. First, I begin this thesis by identifying the adoption and integration strategies of social media and digital marketing into traditional marketing channels in a B2B context. In this part, I identify the B2B firms’ target audience and propose a model facilitating a B2B firm’s practical social media adoption strategies. Second, to explore the benefits of different social media content sharing approaches derived from information accessibility resulted in the prior study of this thesis, I introduce and examine Public and Gated-Content sharing approaches. Thereafter, assisted by Social Power Theory and Resource Dependence Theory, I examine the effect of Public and Gated-Content sharing approaches on the target audience’s willingness to interact with the firm. The findings of this study reveal that Gated-Content approach can help the firms build closer relationship with the target audience and engage them in a co-creation process. Third, by studying proximity marketing through the adoption of beacon technology in the retail context, I explore the current methods of usage, as well as the benefits and challenges of in-store proximity marketing adoption for content sharing purposes. I complete the thesis by presenting the different challenges of such adoption, which consist technical, human behavior, managerial perception, resource and privacy factors. Finally, I identify the need to integrate the physical aspect of place and location back again into the online digital communication channels within a retail context.QC 20171219
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Martinsson, Sara, and Alexandra Struwe. "Platsbunden kommunikation& digital platsmarknadsföring -En fallstudie om Motala, Östergötlands sjöstad." Thesis, Örebro universitet, Institutionen för humaniora, utbildnings- och samhällsvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-71916.
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This qualitative study aims to examine how Tillväxt Motala AB are working strategically to market Motala, a middle-sized city in Sweden. The study is implemented through qualitative semi-structured interviews with employees at Tillväxt Motala AB. The theories on which this study is built are strategic communication, place branding and marketing communication, and a few concepts regarding propaganda. The results show an integration of marketing and communication work roles at the organisation of interest. A deficiency concerning internal communication at Tillväxt Motala AB, due to lack of time, was found. Furthermore, Tillväxt Motala AB has a unique contact with both local and external networks from which employees benefit in their work regarding the place branding. Consensus in the interpretation of place branding as a definition was found among the employees - to highlight a place's positive qualities through communication to meet the needs of the business sector, visitors and residents and to differentiate themselves.
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Bornestav, Eric. "Digital detox – människans räddning i den digitala eran? : En etnografisk studie om digital detox." Thesis, Södertörns högskola, Institutionen för kultur och lärande, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-35726.
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Uppsatsens syfte är att få en djupare förståelse för fenomenet digital detox och hur problem knutna till det alltmer digitalt uppkopplade samhället framställs samt hur dessa är tänkta att lösas inom detox-trenden. Följande frågeställningar är utformade för att besvara syftet: 1. Hur framställs problem knutna till det alltmer digitalt uppkopplade samhället inom digital detoxtrenden? 2. Hur är dessa problem tänkta att lösas? Det vill säga, vad innebär det egentligen att göra en digital detox? Uppsatsens teoretiska ramverk kretsar runt det accelererande samhället samt de effekter som de digitala medierna har inneburit för människan. Däribland redogörs det för upplevelsen av tid, tidspress, medierad interaktion och digital bundenhet. Studien genomfördes med en deltagande observation på digital detox-lägret Villa Insikt i norra Sverige den 17-19 november 2017. Materialet består bland annat av en intervju med kursledaren, informella samtal med densamme och övriga deltagare, fältanteckningar samt analys av broschyrer och lägrets hemsida. Resultatet visar att digitala medier, enligt detox-lägret, har inneburit en rad olika problem för människor. Trots detta ges inga konstruktiva förslag för hur dessa problem ska lösas. Uppsatsens huvudsakliga slutsats är således att detoxen enbart fungerar som ett konstaterande över att människors bundenhet och förhållningssätt till de digitala medierna är problematisk samt att detoxen inte innebär någon större förändring för deltagarna som istället individuellt måste försöka att lösa de problem som detoxen påvisar genom insikt och digital strategi.
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Martelli, Chiara. "Multi-standard low-power base-band digital receiver, enhanced for HSDPA /." Konstanz : Hartung-Gorre, 2006. http://www.loc.gov/catdir/toc/fy0707/2007366221.html.
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Originally presented as the author's thesis (Swiss Federal Institute of Technology), Diss. ETH No. 16683.Summary in Italian and English; text in English. Includes bibliographical references (p. 171-177).
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Tsai, Tsung-Heng. "Time-interleaved analog-to-digital converters for digital communications /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.
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盧志明 and Chi-ming Lo. "Analytical evaluation of wireless digital communication performance over fading channels." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B3124208X.
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Ruiz, Svensson Erik, and Emma Rådhall. "Social responsibility in the digital era : Digital communication agencies social responsibility in digital channels." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Datateknik och informatik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-46404.
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Purpose and problem discussion: Nowadays, it is crucial to implement social responsibility to business operations to succeed as a business. Companies face increased demands from customers and stakeholders to show their actions regarding social responsibility. At the same time, digital development is shaping the communication industry, creating new communication platforms in the world. The purpose of this study is to explore digital communication agencies role in the production and implementation of digital products within digital channels to best understand digital social responsibility. The study aims to answer the research questions: What social responsibilities does a digital communication agency have in regard to the products and messages they produce for digital channels? and How do digital communication agencies become socially responsible when using digital channels? Method: An abductive analysis method was applied to semi-structured interviews with digital communication agencies in Jönköping, Sweden. The analysis of the empirical findings has resulted in deeper understanding of social responsibility in digital environments; a study area that has not been explored before. Four digital communication agencies represent the average digital social responsibility mindset and business culture in Jönköping, Sweden. This gave us the possibility to research social responsibility on digital channels. Results, discussion and conclusions: The results show that the digital communication agencies clients are entirely responsible for the digital material published on their own digital channels. Although, the agencies do need to make sure they produce the best possible material for their clients to avoid bad relationships with stakeholders and a bad reputation. The results also show that social responsibility is not first priority for any company; profitability always comes first. The key to digital social responsibility is to work with the right clients and thoroughly analyse the client’s business operations to bring out the best in each case and to be prepared for backlashes. The digital communication agencies could also benefit from a crisis plan, to minimise stress and optimize the problem solving if a crisis would occur. If doing this correctly,the agencies enable genuine and honest digital communication, which minimises the risk of being perceived unfairly on digital platforms. This is especially of importance on digital platforms, where the speed, great reach and two-way communication makes it even easier to receive negativity and face backlashes. A digital communication agency can become socially responsible by working with the right clients, as well as producing and publishing genuine and honest digital communication.
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Pous, Solà Marc. "Radiated transient interferences in digital communication systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/299210.
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In the Electromagnetic Compatibility research area, an unsolved interference problem is the measurement and evaluation of the distortion produced by radiated transient disturbances on digital communication systems. This impulsive noise, which is generated by switching devices or by sparks, is a broadband interference that covers the spectrum from DC to several hundreds of megahertz or some gigahertz. Additionally, this man-made noise is characterized by its short and random burst parameters, which make really challenging to measure it correctly. During the thesis, we have explained that impulsive noise is not properly measured and evaluated to prevent interference scenarios, when the EMC standard methodologies are applied. Detectors, such as the quasi-peak, frequency sweep measurements or signal-to-noise limiting evaluation described in the harmonized standards of the electromagnetic compatibility do not enable to determine beforehand the influence of transient interferences.
Our strategy to overcome the non-profit measurement has been to perform novel measurement and evaluation techniques beyond EMC standards. The measurement technique developed joins the capabilities of EMI receivers and oscilloscope instrumentations to capture accurately the radiated transient interference. To carry out the measurement, the input stage of the EMI receiver is used for filtering and pre-amplifying purposes, conducting the IF output towards the oscilloscope, which is used for triggering and storage. Furthermore, a final post-processing stage is needed to obtain in time-domain the in-phase and quadrature components of the transient interference.
Once the radiated transient interference has been measured properly, an accurate evaluation of the distortion produced to a digital communication system can be estimated. To evaluate the impact of the transient interference, a combination of the time-domain measurement with base-band simulation has been proposed to fulfil the thesis goal. The IQ time-domain measurement enables us to characterize the impulsive-noise present at the communication channel and determine the distortion produced to the digital communication system by means of base-band simulation. The procedure to determine the BER using the base-band simulation has been validated with experimental results, comparing the results reached with the developed methodology with the ones obtained when a communication system device is placed under radiated transient. Excellent results have been obtained employing the developed methodology, considering the interference produced by radiated transient to RFID or GSM communication systems
Additionally, a new measurement methodology to obtain the amplitude probability diagram (APD) has been developed, offering the possibility to determine the bit-error-rate including limit lines at the APD diagram. This measurement method, based on captures obtained from a general purpose oscilloscope, makes it possible to obtain the APD measurement at any frequency band with the same accuracy provided by an EMI receiver. Furthermore, the post-processing tools using mathematical software produce the APD results rapidly at any bandwidth, and this makes it more powerful than employing an EMI receiver.
The successful APD measurement system created is able to obtain the full-spectrum statistical measurement, employing several time-domain captures which can be acquired in practice immediately. In the final chapter of this thesis, the GSM system is interfered by radiated transients produced by sparks. The results provided by the APD diagram including the limit dots have been especially useful due to its fast capacity to interpret and quantify the degradation produced to the GSM system.En el camp de recerca de la compatibilitat electromagnètica, una de les problemàtiques no resoltes és la mesura i avaluació de les interferències produïdes per transitoris radiats sobre els equips de comunicació digitals. Aquest tipus de soroll impulsiu, que es genera per la commutació d' equips electrònics o guspires, és una interferència de banda ampla que ocupa l' espectre radioelèctric fins a diversos centenars de megahertz o algun gigahertz. A més, aquest soroll es caracteritza per la seva curta durada i l'aleatorietat dels seus paràmetres, i això fa que sigui molt complicat mesurar correctament la interferència. Al llarg de la tesi, hem explicat que el soroll impulsiu no es mesura ni s'avalua adequadament per evitar escenaris d'interferències si s'utilitzen les metodologies definides als estàndards d' EMC. Els detectors, com el de quasi-pic, l'escombratge en freqüència o l'avaluació basada en els límits relacionats amb la relació senyal a soroll no són vàlids per anticipar la influència de les interferències transitòries. La nostra estratègia per solucionar els problemes de les mesures normatives ha estat desenvolupar noves tècniques de mesura i avaluació fora dels estàndards d'EMC. La tècnica de mesura desenvolupada combina les capacitats dels receptors EMI i els oscil·loscopis per capturar la interferència transitòria radiada. Per realitzar les mesures, l'etapa d'entrada del receptor EMI s¿utilitza amb la finalitat de filtrar i preamplificar, enviant la sortida IF cap a l'oscil·loscopi, que es fa servir per detectar i emmagatzemar els transitoris. Per últim, en l'etapa de postprocessament, s'obtenen en el domini del temps els components en fase i en quadratura de la interferència transitòria. Una vegada s'ha mesurat adequadament la interferència radiada, es pot estimar correctament la distorsió produïda sobre els sistemes de comunicació digitals. Per avaluar l'impacte de la interferència transitòria i així complir amb l'objectiu de la tesi, s'ha proposat combinar les mesures en el domini del temps amb la simulació en banda base. La mesura IQ en el domini del temps ens permet caracteritzar el soroll impulsiu present al canal de comunicació i així determinar la distorsió produïda al sistema de comunicació digital mitjançant la simulació en banda base. El procediment per determinar el BER fent servir la simulació en banda base ha estat validat amb resultats experimentals, i s'han comparat els resultats obtinguts utilitzant la metodologia desenvolupada amb els resultats proporcionats directament col·locant un dispositiu sota la influència de transitoris radiats. Els excel¿lents resultats obtinguts considerant interferències produïdes sobre sistemes RFID i GSM han estat publicats. D'altra banda, també s'ha desenvolupat un nou mètode de mesura per adquirir el diagrama de probabilitat d¿amplitud (APD), oferint la possibilitat de determinar la probabilitat d'error en el bit incloent límits en el diagrama APD. Aquest mètode de mesura, basat en captures obtingudes mitjançant un oscil·loscopi de propòsit general, fa possible obtenir la mesura APD en qualsevol banda freqüencial amb la mateixa exactitud que proporciona un receptor EMI. A més, amb les eines de postprocessament desenvolupades és possible produir els resultats APD ràpidament i amb qualsevol amplada de banda, i això fa que sigui un mètode de mesura més potent que no pas utilitzar un receptor EMI. L'exitós sistema de mesura creat per obtenir l'APD és capaç d'obtenir la mesura estadística en tot l'espectre radiolèctric utilitzant poques captures en el domini del temps, les quals a la pràctica soón adquirides de forma inmediata. Al capítol final de la tesi, el sistema GMS és interferit per transistors radiats produïts per guspires. El resultat proporcionat pel diagrama APD, incloent-hi els límits, és especialment útil gràcies a la seva rapidesa per interpretar i quantificar la degradació produïda sobre el sistema GSM.
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Sandberg, Sara. "Modulation and channel effects in digital communication /." Luleå : Luleå University of Technology, 2005. http://epubl.luth.se/1402-1757/2005/49.
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Bradley, Martin James. "Adaptive equalisation for fading digital communication channels." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/5177/.
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This thesis considers the design of new adaptive equalisers for fading digital communication channels. The role of equalisation is discussed in the context of the functions of a digital radio communication system and both conventional and more recent novel equaliser designs are described. The application of recurrent neural networks to the problem of equalisation is developed from a theoretical study of a single node structure to the design of multinode structures. These neural networks are shown to cancel intersymbol interference in a manner mimicking conventional techniques and simulations demonstrate their sensitivity to symbol estimation errors. In addition the error mechanisms of conventional maximum likelihood equalisers operating on rapidly time-varying channels are investigated and highlight the problems of channel estimation using delayed and often incorrect symbol estimates. The relative sensitivity of Bayesian equalisation techniques to errors in the channel estimate is studied and demonstrates that the structure's equalisation capability is also susceptible to such errors. Applications of multiple channel estimator methods are developed, leading to reduced complexity structures which trade performance for a smaller computational load. These novel structures are shown to provide an improvement over the conventional techniques, especially for rapidly time-varying channels, by reducing the time delay in the channel estimation process. Finally, the use of confidence measures of the equaliser's symbol estimates in order to improve channel estimation is studied and isolates the critical areas in the development of the technique — the production of reliable confidence measures by the equalisers and the statistics of symbol estimation error bursts.
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Jalali, Sammuel. "Wireless Channel Equalization in Digital Communication Systems." Scholarship @ Claremont, 2012. http://scholarship.claremont.edu/cgu_etd/42.
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Our modern society has transformed to an information-demanding system, seeking voice, video, and data in quantities that could not be imagined even a decade ago. The mobility of communicators has added more challenges. One of the new challenges is to conceive highly reliable and fast communication system unaffected by the problems caused in the multipath fading wireless channels. Our quest is to remove one of the obstacles in the way of achieving ultimately fast and reliable wireless digital communication, namely Inter-Symbol Interference (ISI), the intensity of which makes the channel noise inconsequential.
The theoretical background for wireless channels modeling and adaptive signal processing are covered in first two chapters of dissertation.
The approach of this thesis is not based on one methodology but several algorithms and configurations that are proposed and examined to fight the ISI problem. There are two main categories of channel equalization techniques, supervised (training) and blind unsupervised (blind) modes. We have studied the application of a new and specially modified neural network requiring very short training period for the proper channel equalization in supervised mode. The promising performance in the graphs for this network is presented in chapter 4.
For blind modes two distinctive methodologies are presented and studied. Chapter 3 covers the concept of multiple "cooperative" algorithms for the cases of two and three cooperative algorithms. The "select absolutely larger equalized signal" and "majority vote" methods have been used in 2-and 3-algoirithm systems respectively. Many of the demonstrated results are encouraging for further research.
Chapter 5 involves the application of general concept of simulated annealing in blind mode equalization. A limited strategy of constant annealing noise is experimented for testing the simple algorithms used in multiple systems. Convergence to local stationary points of the cost function in parameter space is clearly demonstrated and that justifies the use of additional noise. The capability of the adding the random noise to release the algorithm from the local traps is established in several cases.
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Wong, Dennis Mou Ling. "Automatic classification of digital communication modulation schemes." Thesis, University of Liverpool, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400128.
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Mokhtar, Makhfudzah. "Improved digital ternary performance in optical communication." Thesis, University of Essex, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438135.
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Dallmeier-Tiessen, Sünje. "Drivers and barriers in digital scholarly communication." Doctoral thesis, Humboldt-Universität zu Berlin, Philosophische Fakultät I, 2014. http://dx.doi.org/10.18452/16926.
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Zwei Innovationen innerhalb von Open Science werden in dieser Dissertation untersucht: Open Access und der Umgang mit Forschungsdaten. Die Ergebnisse zeigen ein positives Meinungsbild gegenüber beiden Innovationen, was sich allerdings nicht in einer übergreifenden Umsetzung in der Wissenschaft niederschlägt. Die disziplinären Unterschiede sind markant. Es lassen sich aber übergeordnete Ebenen herausarbeiten: Soziologische, technische & infrastrukturelle, sowie strategische & monetäre Aspekte gehören hierzu, wobei starke Interdependenzen zu verorten sind. Traditionell werden Qualität und Prestige von veröffentlichten wissenschaftlichen Ergebnissen als Maßgabe für die Reputation eines Wissenschaftlers angesehen, was klar in den Resultaten dieser Arbeit reflektiert ist. Sie präferieren die Nutzung von Publikationsorganen und Arbeitsabläufen, die in der Fachgemeinschaft etabliert sind. Daraus folgt ein zögerlicher Umgang mit Innovationen, z.B. dem offenem Zugang zu Forschungsdaten, wo es nur wenige etablierte Abläufe gibt. In der Diskussion dieser Arbeit wird die Notwendigkeit einer Verbindung zu heutigen Anreizsystemen und damit den Evaluierungssystemen in der Wissenschaft herausgestellt. Neue Strategien diesbezüglich sind im Aufbau, z.B. mit “zählbaren” Publikationen und Zitationen für Forschungsdaten. Die Kernthemen wurden in der Fallstudie der Hochenergiephysik genauer untersucht. Eine digitale Bibliothek erlaubte dort die praktische Implementierung von Open Science Werkzeugen. Die Ergebnisse unterstreichen das Potential: mit gezielten Diensten und Anreizen können Wissenschaftler für Open Science gewonnen werden; in diesem Fall zur Teilnahme in einem Crowdsourcingprojekt der digitalen Bibliothek und zur Umsetzung von „data sharing“. Dem Informationsmanagement kommt dabei eine neue Rolle zu, insbesondere bei einer engen Betreuung von Wissenschaftlern im digitalen Forschungsumfeld. Das kann parallel für die Serviceentwicklung und –begleitung genutzt werden.Two major Open Science innovations, Open Access and research data sharing, have been studied in detail in this thesis. A large-scale survey and personal interviews are used to gain detailed insights from a range of disciplines. In addition, a case study in the High Energy Physics (HEP) community was used to study the results in practice. The results show that a rather positive attitude towards both, Open Access and research data sharing is not reflected in the researchers’ practices. Disciplinary differences prevail and relate to the different publishing cultures and research workflows. The results indicate that quality and prestige of research output are perceived as very important in determining a researcher’s reputation. Researchers prefer community-approved publication outlets. They hesitate to explore new innovations, such as data sharing, for which only few established workflows exist in digital scholarly communication. Interviewees highlight the significance of a (missing) link between such approaches on the one hand and the current incentive system and the research assessment schemes on the other. The results indicate that barriers can be overcome. In the case study, a strong collaboration with the community facilitated enhanced feedback loops to develop tailored and targeted services for Open Science. Researchers in the case study were successfully engaged in new innovative workflows: a crowdsourcing tool and data sharing in a digital library. The results highlight that opportunities of Open Science are not yet explored widely. But with targeted support, it is possible to build on best practices and develop strategies that engage communities in new innovations. The results furthermore demand new strategies to establish links from Open Science services to the academic incentive system. It is needed to revisit the current research assessment scheme in regard to potential support mechanisms for Open Science.
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Goh, Cheh-Ngee. "Random multiple access in digital communication networks." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47079.
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Jamil, Izdihar Bt. "Communication patterns around multi-touch digital tabletops." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.633228.
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With advances in digital tabletop technology and increased levels of affordability in recent years, there has been growing interest in exploring multi-touch digital tabletops within educational contexts. Multi-touch digital tabletops offer simultaneous touch input facilities and a face-to-face communication platform- beneficial and attractive features for collaboration. This thesis focuses on understanding the communication patterns when children interact around digital tabletops within a learning environment. This thesis proposes three main contributions: 1) an analysis of the talk patterns between children when they collaborate around digital tabletops 2) the behavioural patterns of how children in India collaborate around digital tabletops and 3) the behavioural patterns of how children in multiple countries interact around digital tabletops. These findings highlight the importance of understanding the conversation styles and the behavioural patterns of children collaborating around multi-touch digital tabletops within an educational context. Moreover, understanding the communication patterns and interaction styles that occur within a multiple country setting provide an access such that any technological deployment can have a positive impact on their local users.
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Spiez, Michal Krzysztof. "Light communication - digital interface : USB - optical receiver." Master's thesis, Universidade de Aveiro, 2008. http://hdl.handle.net/10773/2038.
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Mestrado em Engenharia Electrónica e TelecomunicaçõesOs sistemas de comunicação por luz visível surgem como uma alternativa aos tradicionais sistemas de comunicação ópticos por raios infravermelhos. Esta alternativa tem por base a rápida evolução dos dispositivos de iluminação de estado sólido. Até há bem pouco tempo, as tradicionais lâmpadas incandescentes ou fluorescentes dominavam a tecnologia de iluminação. Recentemente, os dispositivos de estado sólido, como por exemplo, os LEDs (Light Emiting Diodes) de alta intensidade, tem evidenciado as suas vantagens neste domínio: maior eficiência, durabilidade e preço de fabrico. Adicionalmente estes dispositivos possibilitam outros domínios de aplicação, que não sejam exclusivamente a iluminação. A possibilidade de comutação rápida destes dispositivos torna-os adequados ao emprego em sistemas de comunicação tendo por base a luz visível. No âmbito deste trabalho pretendeu-se desenvolver um sistema de comunicação por luz visível capaz de servir o propósito de validação de conceito. Para tal, consideraram-se duas tarefas distintas: a concepção dos sistemas electrónicos de emissão-recepção de sinais ópticos, e o sistema de processamento de dados. O sistema de processamento de dados foi em particular o que definiu o tema desta dissertação. De forma a tornar o processo de geração e descodificação simples e eficiente, optou-se por recorrer ao protocolo USB. Desta forma tentou-se implementar uma solução que do ponto de vista do utilizador fosse tão simples como a utilização de um qualquer periférico plug-play num PC. Esta dissertação discute a implementação deste sistema de processamento de dados, tendo como recursos disponíveis uma placa de aquisição de dados em formato USB, e acessórios de electrónica digital reconfigurável. ABSTRACT: Visible light communication systems appear as a suitable alternative to the more traditional Infra-Red optical communication systems. This possibility is motivated by the fast evolution of solid-state lighting devices. Traditional incandescent and fluorescent light bulbs have been the unique solutions for the illumination purpose for years. Solid-state lighting devices, as for instance high brightness LEDs (Light Emitting Diodes), have become available. These devices present several advantages over the traditional light bulbs: they are more power efficient, they have lower production costs, and increased durability. Additionally, solid-state lighting devices present the useful property of fast switching, which makes them suitable for communication purposes, employing visible light. The main objective of this project was to develop a visible light communication system able to provide a practical demonstration test-bed for this new technology. In order to fulfill this objective, two separate tasks have been foreseen: The optical receiver-transmitter able to cope with the visible light requirements; and the data processing system. This dissertation was focused on the data processing system. USB protocol was chosen in order to simplify the processes of data generation and recovery. This would make the final systems as simple to use as any other USB plug-and-play device. This dissertation discusses the implementation of the data processing system, using one standard USB acquisition board plus digital reconfigurable electronic devices.
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Perez, Michael A. "Digital Public: Materializing the Space of Communication." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1423581096.
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Glass, Abdullatif M. "Digital communication networks incorporating mobile data terminals." Thesis, Aston University, 1989. http://publications.aston.ac.uk/8086/.
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The use of digital communication systems is increasing very rapidly. This is due to lower system implementation cost compared to analogue transmission and at the same time, the ease with which several types of data sources (data, digitised speech and video, etc.) can be mixed. The emergence of packet broadcast techniques as an efficient type of multiplexing, especially with the use of contention random multiple access protocols, has led to a wide-spread application of these distributed access protocols in local area networks (LANs) and a further extension of them to radio and mobile radio communication applications. In this research, a proposal for a modified version of the distributed access contention protocol which uses the packet broadcast switching technique has been achieved. The carrier sense multiple access with collision avoidance (CSMA/CA) is found to be the most appropriate protocol which has the ability to satisfy equally the operational requirements for local area networks as well as for radio and mobile radio applications. The suggested version of the protocol is designed in a way in which all desirable features of its precedents is maintained. However, all the shortcomings are eliminated and additional features have been added to strengthen its ability to work with radio and mobile radio channels. Operational performance evaluation of the protocol has been carried out for the two types of non-persistent and slotted non-persistent, through mathematical and simulation modelling of the protocol. The results obtained from the two modelling procedures validate the accuracy of both methods, which compares favourably with its precedent protocol CSMA/CD (with collision detection). A further extension of the protocol operation has been suggested to operate with multichannel systems. Two multichannel systems based on the CSMA/CA protocol for medium access are therefore proposed. These are; the dynamic multichannel system, which is based on two types of channel selection, the random choice (RC) and the idle choice (IC), and the sequential multichannel system. The latter has been proposed in order to supress the effect of the hidden terminal, which always represents a major problem with the usage of the contention random multiple access protocols with radio and mobile radio channels. Verification of their operation performance evaluation has been carried out using mathematical modelling for the dynamic system. However, simulation modelling has been chosen for the sequential system. Both systems are found to improve system operation and fault tolerance when compared to single channel operation.
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Nilsson, Rickard. "Digital communication in wireline and wireless environments." Licentiate thesis, Luleå tekniska universitet, Signaler och system, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17330.
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This thesis consists of an introduction and five parts dealing with digital communication. Three parts address Discrete Multi-Tone modulation (DMT), a wireline form of Orthogonal Frequency Division Multiplexing (OFDM). One part addresses channel estimation in wireless OFDM and one addresses multiuser detection in wireless Direct Sequence-Code Division Multiple Access (DS- CDMA).The first part presents a new duplex method, called Zipper, for Very High bit rate Digital Subscriber Lines (VDSL). It is a duplex method that offer high flexibility and compatibility with existing services in the access network. The second part presents a digital Radio Frequency Interference (RFI) suppression method. It is located in the frequency domain and it can be used by any DMT-based VDSL system. The third part presents a method to run Zipper in an asynchronous mode with only a small performance loss. This can be of interest for telecom operators when constructing a VDSL system. The fourth part examines the trade-off between pilot symbol spacing and symbol error rate in a wireless OFDM system using Pilot Symbol Assisted Modulation (PSAM). The last part presents a low complexity multiuser detector for wireless DS-CDMA. It consists of a pipelined detector structure that produces Maximum Likelihood Secence Detector (MLSD) decisions on some of the received bits in the sequence. The remaining, previously undetected bits, are fed to a secondary post-processor.Godkänd; 1999; 20070404 (ysko)
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Moussa, Badi M. S. "Adaptive transform coding for digital image communication." Thesis, Loughborough University, 1985. https://dspace.lboro.ac.uk/2134/27360.
Full textAbstract:
The performance of transform image coding schemes can be improved substantially by adapting to changes in image statistics. Essentially, this is accomplished through adaptation of the transform, bit allocation, and/or quantization parameters according to time-varying image statistics. Additionally adaptation can be used to achieve transmission rate reduction whilst maintaining a given picture quality.
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Zhu, Zhechen. "Automatic classification of digital communication signal modulations." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/9246.
Full textAbstract:
Automatic modulation classification detects the modulation type of received communication signals. It has important applications in military scenarios to facilitate jamming, intelligence, surveillance, and threat analysis. The renewed interest from civilian scenes has been fuelled by the development of intelligent communications systems such as cognitive radio and software defined radio. More specifically, it is complementary to adaptive modulation and coding where a modulation can be deployed from a set of candidates according to the channel condition and system specification for improved spectrum efficiency and link reliability. In this research, we started by improving some existing methods for higher classification accuracy but lower complexity. Machine learning techniques such as k-nearest neighbour and support vector machine have been adopted for simplified decision making using known features. Logistic regression, genetic algorithm and genetic programming have been incorporated for improved classification performance through feature selection and combination. We have also developed a new distribution test based classifier which is tailored for modulation classification with the inspiration from Kolmogorov-Smirnov test. The proposed classifier is shown to have improved accuracy and robustness over the standard distribution test. For blind classification in imperfect channels, we developed the combination of minimum distance centroid estimator and non-parametric likelihood function for blind modulation classification without the prior knowledge on channel noise. The centroid estimator provides joint estimation of channel gain and carrier phase o set where both can be compensated in the following nonparametric likelihood function. The non-parametric likelihood function, in the meantime, provide likelihood evaluation without a specifically assumed noise model. The combination has shown to have higher robustness when different noise types are considered. To push modulation classification techniques into a more timely setting, we also developed the principle for blind classification in MIMO systems. The classification is achieved through expectation maximization channel estimation and likelihood based classification. Early results have shown bright prospect for the method while more work is needed to further optimize the method and to provide a more thorough validation.