Dissertations / Theses on the topic 'Mobile communications'
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Wang, Tiejun. "Mobile OFDM communications." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3211276.
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Thesis (Ph. D.)--University of California, San Diego, 2006.Title from first page of PDF file (viewed June 7, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 104-111).
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Artusi, Denise. "5g mobile communications systems." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7563/.
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Un sistema mobile di comunicazione è un sistema di telecomunicazioni in cui è possibile mantenere la connessione o legame tra due o più utenti, anche nelle situazioni di mobilità totale o parziale degli stessi utenti. I sistemi radiomobili si stanno evolvendo dalla creazione del 1G (prima generazione) al 4G (quarta generazione). I telefoni di ogni generazione si differenziano in quattro aspetti principali : accesso radio, velocità di trasmissione dati, larghezza di banda e sistemi di commutazione.
In questa tesi si affronta il tema dei sistemi 5G , negli ambienti terrestri e satellitari , in quanto sono l'ultima evoluzione dei sistemi mobili .
Si introduce il passaggio dalla prima alla connessione di quarta generazione , al fine di capire perché 5G sta per cambiare la nostra vita . Quello che mi colpisce è il sito italiano www.Repubblica.it che dice : " con la nuova generazione 5 possiamo affidare le intere porzioni nette di vita". La tecnologia cellulare , infatti , ha cambiato radicalmente la nostra società e il nostro modo di comunicare . In primo luogo è cambiata la telefonia vocale , per poi trasferirsi all' accesso dati , applicazioni e servizi. Tuttavia , Internet non è stato ancora pienamente sfruttato dai sistemi cellulari. Con l'avvento del 5G avremo l'opportunità di scavalcare le capacità attuali di Internet . Il sistema di comunicazione di quinta generazione è visto come la rete wireless reale , in grado di supportare applicazioni web wireless a livello mondiale ( wwww ). Ci sono due punti di vista dei sistemi 5G : evolutivo e rivoluzionario. Dal punto di vista evolutivo, i sistemi 5G saranno in grado di supportare wwww permettendo una rete altamente flessibile come un Adhoc rete wireless dinamica ( DAWN ) . In questa visione tecnologie avanzate, tra cui antenna intelligente e modulazione flessibile , sono le chiavi per ottimizzare le reti wireless ad hoc. Dal punto di vista rivoluzionario, i sistemi 5G dovrebbe essere una tecnologia intelligente in grado di interconnettere tutto il mondo senza limiti . Un esempio di applicazione potrebbe essere un robot wireless con intelligenza artificiale .
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Un, Man Wai. "Pricing in mobile communications services." Thesis, University of Macau, 2003. http://umaclib3.umac.mo/record=b1636778.
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Gustafsson, Harald. "Speech enhancement for mobile communications /." Ronneby : Dept. of Telecommunications and Signal Processing, Univ. of Karlskrona/Ronneby [Institutionen för telekommunikation och signalbehandling, Högsk. i Karlskrona/Ronneby], 2000. http://www.bth.se/fou/.
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GUIMARAES, ALBERTO GASPAR. "RADIOLOCATION OF MOBILE COMMUNICATIONS TERMINALS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5906@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROEste trabalho lida com o problema de radiolocalização de terminais em um ambiente de comunicações móveis celulares. Desenvolve-se novas alternativas para a estimação da posição, admitindo-se que as medidas de tempo de chegada (ToA) obtidas no enlace-rádio estão corrompidas por ruído aditivo e apresentam erro médio positivo durante períodos aleatórios, devido à ausência de linha de visada (NLOS) entre terminal e estações radio-bases. Em uma das alternativas desenvolve-se um estimador assintoticamente eficiente do erro de NLOS, sob o critério de mínimos quadrados ponderados (WLS). Para esta estimativa, admite- se o conhecimento a priori do espalhamento temporal do canal, e que o perfil de potência do sinal pode ser calculado por uma média temporal de medidas independentes em um receptor RAKE. O esquema de localização apresentado incorpora também um teste de hipóteses desenvolvido sob o critério de Neyman-Pearson, para detectar, a cada instante de tempo, a ocorrência de transições entre os estados LOS/NLOS do canal. Em outra contribuição do trabalho, as coordenadas do terminal são estimadas recursivamente utilizando-se algoritmos bayesianos, com a dimensão do espaço de estados aumentada para incluir o efeito do erro de NLOS sobre as medidas de ToA. Resultados de simulação obtidos sob diferentes cenários comprovam a eficiência dos esquemas de estimação aqui desenvolvidos, quando comparados à única solução de que se tem conhecimento na literatura. Apresenta-se ainda nesta tese uma análise para o problema de ambigüidade em métodos hiperbólicos de localização, cujo objetivo é identificar a região do plano em que este método fornece duas soluções fisicamente admissíveis. A área desta região é comparada com a área total de triangulação.
This work addresses the radiolocation problem of a moving terminal in a cellular mobile communications environment. New alternatives are developed for position estimation, assuming that the Time of Arrival (ToA) measurements obtained from radio link are corrupted by additive noise and have positive mean error during random periods of time due to the non-line of sight (NLOS) propagation condition between the terminal and base stations. In one of the proposals, an asymptotically efficient WLS estimator of the NLOS error is developed under the Weighted Least Squares criterion. It is assumed that the channel temporal scattering model is known and the mean power delay profile can be evaluated by time averaging independent measurements from a RAKE receiver. The location estimation scheme also includes a hypothesis testing based on Neyman- Pearson approach to detect at each instant of time the LOS/NLOS states transitions. In another contribution, the terminal coordinates are recursively estimated using bayesian algorithms, with the state-space dimension augmented to include the NLOS error effect over ToA measurements. Simulation results obtained under different scenarios show the effectiveness of the estimation schemes developed here when compared to the only alternative known from the literature. An analysis concerning the ambiguity problem in hyperbolic location methods is also presented, aiming to determine the regions where this method gives two physically admissible solutions, and compare them to the total trilateration area.
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Arredondo, Alberto. "Downlink beamforming for mobile communications." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3035934.
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Leppäniemi, M. (Matti). "Mobile marketing communications in consumer markets." Doctoral thesis, University of Oulu, 2008. http://urn.fi/urn:isbn:9789514288159.
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This dissertation aims to examine the theoretical and empirical foundations of the mobile marketing phenomenon. While numerous studies have yielded important insights into this topic, the existing mobile marketing literature appears to be inconsistent and somewhat fragmented. With the help of two action research projects, interviews of mobile marketing practitioners, and an online survey, this study aims to contribute to our understanding of the nature of mobile marketing communications in consumer markets.
This thesis consists of an introductory section and five papers. The first paper evaluates the current state of mobile marketing research based on a review and an analysis of extant literature that focuses on mobile (or wireless) applications aimed at marketing or advertising. Various definitions of mobile marketing are evaluated and a more technologically-agnostic definition is provided. The second paper presents a framework of the mobile marketing communications environment that delineates how mobile marketing should be integrated into a company's integrated marketing communications strategy. A comprehensive overview of divergent mobile marketing activities is provided, along with representative examples derived from popular press. In addition, a detailed description of mobile marketing campaign planning and its implementation process is provided. The third paper provides a conceptual model of the relationships between interactive integrated marketing communications and database management in a mobile context. The results from empirical research suggest that consumers are willing to participate in Short Message Service (SMS) marketing in a retailing context.
The fourth and fifth papers utilize data collected by means of an online survey (n = 4,062) and examine the factors associated with consumers' intention to receive mobile advertising messages and responses to SMS direct-response campaigns. The results suggest that consumers' intention to receive mobile advertising messages is related to the relevance of the message, permission to receive mobile advertising messages, the benefits of receiving the message and the privacy of personal data. In addition, the results suggest that women and men differ significantly in their responses to SMS call-to-action campaigns, consumers aged 36–45 years are most likely to respond to SMS call-to-action in a TV program and participate in SMS sweepstakes and other competitions, and that employment status has a substantial impact on consumers' SMS campaign activity.
Overall, this thesis provides a conceptual and theoretical foundation intended to guide research efforts focused on mobile media and to aid practitioners in their quest to achieve mobile marketing success.
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Neo, Soo Sim Daniel. "Free space optics communication for mobile military platforms." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FNeo.pdf.
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Patel, Chirag S. "Channel modeling and estimation for mobile-to-mobile OFDM communications." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/13552.
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Altuna, Jon. "Cyclostationary blind equalisation in mobile communications." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/1375.
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Blind channel identification and equalisation are the processes by which a channel impulse response can be identified and proper equaliser filter coefficients can be obtained, without knowledge of the transmitted signal. Techniques that exploit cyclostationarity can reveal information about systems which are nonminimum phase; nonminimum phase channels cannot be identified using only second-order statistics (SOS), because these do not contain the necessary phase information. Cyclostationary blind equalisation methods exploit the fact that, sampling the received signal at a rate higher than the transmitted signal symbol rate, the received signal becomes cyclostationary. In general, cyclostationary blind equalisers can identify a channel with less data than higher-order statistics (HOS) methods, and unlike these, no constraint is imposed on the probability distribution function of the input signal. Nevertheless, cyclostationary methods suffer from some drawbacks, such as the fact that some channels are unidentifiable when they exhibit a number of zeros equally spaced around the unit circle. In this thesis the performance of a cyclostationary blind channel identification algorithm combined with a maximum-likelihood sequence estimation receiver is analysed. The simulations were conducted in the pan-European mobile communication system GSM environment and the performance of the blind technique was compared with conventional channel estimation methods using training. It is shown that although blind equalisation techniques can converge in a few hundred symbols in a time-invariant channel environment, the degradation with respect to methods with training is still considerable. Yet, the fact that a dedicated training sequence is not needed makes blind techniques attractive, because the data used for training purposes can be re-allocated as information data. In the concluding part of this thesis a new blind channel identification algorithm which combines methods that exploit cyclostationarity implicitly and explicitly is presented. It is shown that the properties of cyclostationary statistics are exploited in the new algorithm, and enhance the performance of the technique that solely exploits fractionally-spaced sampling. The algorithm is robust in the presence of correlated noise and interference from adjacent users.
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Zuazola, Garcia. "Miniature antennas for mobile wireless communications." Thesis, University of Kent, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.591097.
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The subject of this this has been to produce new antermas suitable for use in Radio-over- Fibre Remote Antenna Units or in Mobile Equi pment which might be used at the other end of the link. Several new antennas have been developed and assessed for their suitable application to RoF systems. The antennas were: (i) a multiband PIFA developed previously in the ROSETTE project and modified here to exhibit an improved match when integrated with a ground plane for ceiling mounting. (ii) A cost effective microstrip array directive antenna for street illumination in the Manhattan Scenario. Beam coverage was controlled by electronic shaping and mechanical tilting. (iii) A new compact PIFA design for use in mobile equipment or sectorized base stations where a slotted structure is used to achieve a sharp edge defined operating bandwidth which allows the antenna to act as a filter, thus reducing component count and insertion loss in the transceiver front end. The antenna has been integrated with a larger handset sized ground plane and its insensitivity to this mounting has been demonstrated. (iv) the antenna in (iii) has been implemented in a 3 sector cluster and interference between sector beams by pattern overlap has been characterized. (v) A new compact PIFA working in the 3-5GHz sub-bands of the FCC UWB band has been described and demonstrated to offer useful performance and exhi bit a useful band pass fil tering characteristic reducing the need for a frontend filter in UW8 systems. (vi) A size reduced PIFA has been presented and studied where the rear ground plane was replaced by a strip element FSS tuned to 450Hz. This was demonstrated to improve performance at that band and the antenna was shown to offer a gain that compared well to a standard PlFA between I and 100Hz. The work described has been undertaken over 3 EU funded projects and the thesis begins with a brief overview of the relevant parts of those projects, particularly how antenna match is of importance at the Remote Antenna Unit of a Radio-over-Fibre system as poor input isolation and reflection can cause ringing in the bidirectional amplifiers associated with the duplex transmission. The new antennas developed for application in mobile equipment are shown to be compact (in relation to electrical size) and are considered in terms of their input bandwidth and efficiency.
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Fabri, S. N. "Multimedia communications over mobile packet networks." Thesis, University of Surrey, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343461.
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This thesis describes several concepts associated with the transmission of multimedia services over mobile radio access networks. The error performance and traffic requirements of real-time video transmission over the General Packet Radio Services (GPRS) access network and its successor Enhanced-GPRS is examined. In view of this. video error resilience techniques which exploit channel prioritisation mechanisms are introduced with a view to increasing the robustness of received video sequences encoded with MPEG-4 to channel errors. These include stream prioritisation using unequal error protection and region-of-interest prioritisation for use in multiparty communications and streaming applications. A new forward-error correction scheme for EGPRS which uses iterative serially-concatenated convolutional-Reed Solomon codes is designed and is shown to significantly enhance the error performance for real-time services. A study of (he use of backward error correction mechanisms when transmitting streaming multimedia services is carried out, and a new retransmission scheme is introduced to increase the capacity of the radio access network when supporting streaming services
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Yong, Su-Khiong. "Compact antenna arrays for mobile communications." Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/11648.
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The contributions of this thesis are four fold. Firstly, the implementation of COST 259 directional channel model in terms of tapped delay line is developed. While the implemented channel model facilities link level simulation, capacity analysis indicates that the delay spread has relatively small impact as compared to the azimuth spread (AS) on the channel capacity. Secondly, an antenna model which incorporates various antenna effects into the performance study of antenna arrays (AAs0 is developed. A comprehensive study of these effects through computer simulations reveals that the use of ideal parameters in the literature always over-predicts the actual system performance. The use of different antenna configurations yields different results with some arrays performing better in certain scenario than others. Furthermore, a proposed mutual coupling (MC) model explains the conflicting results reported to date in the literature. The overall effect of MC is to reduce the system performance despite lower fading correlation is being obtained between the pair of elements when MC is taken into account. Thirdly, the impact of using different azimuth-of-arrival (AOA) and elevation-of-arrival (EOA) distributions on the performance of various AAs is found to be minimal. The determining factor for the AA performance is the standard deviation of the underlying distribution. Finally, three-dimensional spatial fading correlation (SFC) models for several CAA geometries are developed. The closed-form SFC functions are expressed in terms of AOA, EOA and the geometry of the AA under study. Such closed-form expressions can be used to determine the correlation matrices at both base station and mobile station and thus are important in assisting the capacity analysis of single-input multiple-output and multiple-input and multiple-output systems. Furthermore, the developed SFC functions also enable the sensitivity of the AAs to be evaluated through the performance patterns. The results provide invaluable insight that can ultimately assist the design of AA algorithms. An extensive analysis on the array’s sensitivity shows that the system performance is more AS dependent than ES while the effect of mean-azimuth-of-arrival and mean-evaluation-of-arrival is array dependent. The results also show that the AS is the primary factor affecting antenna correlation and the impact of ES is mainly noticeable at small AS values. Nevertheless, in evaluating the performance of AAs, both AOQ and EOA must be taken in account. Capacity analysis also demonstrates the practicability of deploying electromagnetic vector sensor (EVS) and EVS arrays as compact AA receivers.
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Randell, Damian P. "Integrated antenna diplexer for mobile communications." Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402528.
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The rapid growth in second generation mobile telecommunications has resulted in the design of the third generation mobile telecommunication system together with proposals for the fourth generation system. Much of this has been driven by consumer requirements for a global telecommunications system, allowing connection from anywhere around the world and offering data rates that facilitate access to a range of multimedia services. Therefore, continual research into mobile handsets, improving standards and delivering smaller, lower cost devices, is required. The work presented reviews the different mobile technologies and highlights trends in design and application, presenting research into new configurations of RF front-end systems and antennas for mobile communications, specifically the third generation mobile telecommunication system. Developments in the integration of digital circuits has dramatically reduced handset sizes in recent years. However, the same progress has not been seen within RF circuitry. This work, therefore, investigates the properties of microstrip patch antennas for use within mobile handsets and the development of an integrated diplexer antenna. Having reviewed microstrip filters, further designs for a diplexer are also presented. The limitations of these designs are investigated and solutions proposed.
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Stones, Elizabeth Kelly. "Mobile communications : m-crime and security." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1571072/.
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The dramatic growth of mobile communications creates many opportunities for previously disconnected populations to enhance their access to information and resources during periods of crisis, particularly where formal services are weak. While numerous studies have lauded the potential benefits of mobiles, the potential security and crime risks and benefits associated with mobile ownership and use have been largely overlooked. This thesis is concerned with understanding the relationship between crime, the security of developing world populations and the increasing penetration of mobile telephony. The aim is to explore the security-enhancing and crimeinhibiting benefits, and identify and analyse the crime and security threats, associated with mobile phones in developing world settings. The study findings are used to examine whether crime opportunity theories such as routine activity theory can be fruitfully applied to examine the relationship between mobile telephony and constellations of motivated offenders, suitable targets and capable guardians in developing world settings. Specifically, it examines the ways in which mobile phones inhibit crime in developing world settings by increasing the perceived effort and risk, reducing the rewards and provocations, and removing excuses for crime. It then addresses how mobile phones create opportunities for crime in developing world settings, investigating the social and situational conditions which contribute to these crime opportunities through reducing the perceived effort and risk, increasing the rewards and provocations, and contributing to excuses for crime. To support the development of theory, the study utilises primary data collection from two case studies: Kenya and Uganda. These include interviews with relevant stakeholders, focus group discussions and qualitative and quantitative surveys with mobile phone owners, users and non-users. The findings reveal user perceptions of a range of security and crime benefits and threats associated with mobile telephony. These are subsequently examined and classified through opportunity and situational crime analysis and associated prevention techniques. Mobile phones are found to inhibit crime in developing world, primarily through enhancing the perceived risk associated with the commission of crime. However, formal uses for crime reporting and detection remain limited, with the majority of users reliant on informal social networks for support during periods of insecurity. Mobile phones also create new opportunities for crime in resource-poor contexts, both as crime targets and crime facilitators. A range of social, cultural and situational conditions are also found to inform opportunities for crime and crime prevention in developing world settings. A preliminary categorisation of crime and security threats associated with mobile telephony in the two case studies is developed, and the new category of ‘m-crime’ is proposed to incorporate, “any illegal or anti-social activity facilitated or committed using mobile telephony”. Situational crime prevention (SCP) techniques are applied to address opportunities and criminogenic conditions that foster the commission of m-crimes in developing world settings, categorise prevention mechanisms according to effort, risk, reward, provocation and excuses, and propose further techniques using the 25 techniques framework. Opportunity prevention techniques characterising IN SAFE HANDS (Whitehead et al., 2008) are also applied to the prevention of handset theft. Specific methodological challenges associated with the collection of data on perceptions of security in resource-poor, developing world settings are identified. These include limitations of the focus group method in contexts where group dynamics are characterised by inequalities of power which constrain participation, cultural restrictions on expressing dissent and their implications for Likert scale survey responses, and logistical challenges associated with obtaining suitable venues in contexts where privacy is limited and settings do not meet the basic requirements of traditional data collection instruments. Finally, theoretical and practical applications and implications of the study findings are addressed. In particular, the study addresses the applicability of opportunity theories of crime and situational techniques of crime prevention to mobile phones in developing world contexts.
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Ophoff, Jacobus Albertus. "A model for privacy-aware presence management in mobile communications." Thesis, Nelson Mandela Metropolitan University, 2011. http://hdl.handle.net/10948/1354.
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As humans we find communicating natural and compelling. Over the centuries we have created many innovations which enable and improve communication between people; during the past decade mobile phone networks have brought about a technological revolution in this area. Never before have people been so connected to one another. Today we have the ability to communicate with almost anyone, anytime, anywhere. Our increased connectivity and reachability also leads to new issues and challenges that we need to deal with. When we phone someone we expect an instant connection, and when this does not occur it can be frustrating. On the other hand it is equally disruptive to receive a call when one is busy with an important task or in a situation where communication is inappropriate. Social protocol dictates that we try to minimize such situations for the benefit of others nearby and for ourselves. This management of communications is a constant and difficult task. Using presence – which signals a person’s availability and willingness to communicate – is a solution to this problem. Such information can benefit communication partners by increasing the likelihood of a successful connection and decreasing disruptions. This research addresses the problem of staying connected while keeping control over mobile communications. It adopts a design-science research paradigm, with the primary research artifact being a model for privacy-aware presence management in mobile communications. As part of the model development knowledge contributions are made in several ways. Existing knowledge about the problem area is extended through a quantitative analysis of mobile communications management. This analysis uses a novel survey, collecting useful empirical data for future research. This includes how people currently manage their communications and what features they expect from a potential “call management” system. The examination and use of presence standards, as a foundation for the model, provides a comparison of the main presence technologies available today. A focus on privacy features identifies several shortcomings in standards which, if addressed, can help to improve and make these standards more complete. The model stresses the privacy of potentially sensitive presence information. A unique perspective based on social relationship theories is adopted. The use of relationship groups not only makes logical sense but also assists in the management of presence information and extends existing standards. Finally, the evaluation of the model demonstrates the feasibility of a practical implementation as well the ability to extend the model in next generation mobile networks. Thus the model presents a solid foundation for the development of future services. In these ways the proposed model contributes positively towards balancing efficient mobile communications with the need for privacy-awareness.
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Walter, Michael [Verfasser]. "Scattering in non-stationary mobile-to-mobile communications channels / Michael Walter." Ulm : Universität Ulm, 2016. http://d-nb.info/1099086795/34.
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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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Prince, Castro Jonathan Castro Jonathan Prince. "A global satellite system for mobile communications /." [S.l.] : [s.n.], 1995. http://library.epfl.ch/theses/?nr=1300.
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Borselius, Niklas. "Multi-agent system security for mobile communications." Thesis, Royal Holloway, University of London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407884.
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Benson, Maja. "Adaptive space diversity algorithms for mobile communications." Thesis, Staffordshire University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263965.
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Izhac, Abdurrahman. "THz technologies and models for mobile communications." Thesis, University of Reading, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494157.
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This thesis investigates the feasibility of deploying mobile communication networks at the THz frequency range. Three areas were identified as the major issues on the way towards realising a functional THz mobile communication system: the high atmospheric attenuation levels and obstacle shadowing at the THz range, the deficiency in THz devices suitable for mobile telecommunications and the availability of reliable models for the analysis and design of THz radio networks.
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Chen, Jun, and 陳軍. "Multicode CDMA for high-speed mobile communications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B30149903.
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Wu, Jianjun. "Adaptive equalisation techniques for future mobile communications." Thesis, King's College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338815.
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Nawata, Takashi, Akira Sakurai, and Yukiko Nishida. "Paging industry in Japanese mobile communications market." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10978.
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Hendry-Brogan, Meghan. "Design of a mobile coastal communications buoy." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/33584.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2004.Includes bibliographical references (leaves 71-72).
In response to a growing interest in networked communications at sea as well as the needs of our vital commercial fishing industry, the Northeast Consortium funded a novel research initiative to establish wireless acoustic and radio communications at sea. The platform used for this type of telemetry instrumentation was to be a buoy which could not only withstand the often harsh conditions off the northeastern coast of America (specifically, Cape Ann), but do so while exhibiting an exceptionally small response in heave and roll. A spar type buoy was designed and built at the MIT Sea Grant facility. Spars are a special type of buoy shape whose hydrostatic and hydrodynamic interactions with the sea are decoupled enough so that extreme sea conditions do not induce extreme buoy motions. Most oceanographic buoys are of the discus type, and move as the surface of the ocean does. This type of wave-following buoy would not sufficiently facilitate the requirements of the high-bandwidth wireless networking hardware, and therefore would not serve the current purpose.
(cont.) The NEC buoy displaces approximately 140 kg of sea water and is roughly 11 feet long when fully assembled, not including its 5 foot antenna mast. The buoy employs a PC104 stack to control an 802.1 lb wireless card and antenna, an acoustic modem card and transducer, other peripheral instrumentation, a main battery, and a solar power system.
by Meghan Hendry-Brogan.
S.M.
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Smith, William Travis. "Statistical modeling for land mobile satellite communications." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/91072.
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The Land Mobile Satellite System (LMSS) to be available in the 1990 time frame will provide connection between mobile vehicles and the conventional terrestrial communication network. The design is dependent on the propagation characteristics of the land mobile satellite signal. Unlike fixed satellite links, there is blockage in the line of sight path, mainly in the form of vegetative shadowing. The focus of this study is to develop models for the fading of the received satellite signal. A brief review of the physics and statistics associated with mobile propagation is presented. This is followed by a review of current literature and experiments. The modeling of the cumulative distribution function for a totally vegetatively shadowed mobile (VS distribution) is presented. The VS distribution is then used in a model for the cumulative distribution function of a partially shadowed mobile. The complete model for partially shadowed routes permits calculations for arbitrary combinations of open and forested terrain. Comparisons are made to data reported for partially shadowed routes.
The deterministic path model (DPM) developed in an earlier effort is a geometrically based tool for determining the signal path length through a stand of trees. It is expanded to give approximate expressions for the statistical parameters describing the fading of the line-of-sight component of the received signal. New expressions for the secondary statistics of a totally vegetatively shadowed mobile are derived. These new expressions are then used in models for the level crossing rate and average fade duration of a partially shadowed mobile. Comparisons are made to data reported for partially shadowed routes.M.S.
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Bradley, W. Scott. "Propagation modeling for land mobile satellite communications." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/74511.
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Satellite systems are being planned for two-way communication with mobile vehicles using UHF and L-band frequencies. Of special concern in the system design are the characteristics of propagation in suburban and rural areas where fading occurs due to multipath effects and vegetative shadowing. A review of the literature was performed to study these propagation impairments. Available experimental data are examined, compared, and summarized. Propagation through vegetation is studied in order to compare reported modeling efforts and to determine the parameter dependences of path loss. A simple deterministic path model is then presented to estimate vegetative path loss. An overall statistical model is also proposed to describe the signal level fading statistics. The statistical model is compared to data, and the deterministic path model is used to determine the mean of signal level distribution functions in the presence of shadowing.Master of Science
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Alaoui, Nabih. "Cooperative Communications In Mobile Ad hoc NETworks." Limoges, 2013. http://aurore.unilim.fr/theses/nxfile/default/16707b62-af2a-425b-b97b-ee0f900ae15d/blobholder:0/2013LIMO4035.pdf.
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L’étude réalisée dans ce mémoire porte sur la communication et la transmission des données dans le contexte des réseaux de capteurs. Pour améliorer la fiabilité de transmission, des relais sont insérés entre les capteurs et la destination afin de pouvoir corriger les erreurs de transmissions en utilisant des codes LDPC. L’architecture est donc optimisée grâce aux codes en blocs mais aussi à l’aide des protocoles de détection d’erreurs et aussi à l’aide de la combinaison de la correction et de la détection d’erreurs. Les systèmes d’antennes multiples forment également une option très intéressante pour l’amélioration des performances. L’efficacité énergétique est étudiée dans les différents protocoles et solutions proposés. Une optimisation conjointe du codage de canal et du codage de réseau physique est également effectuéeThe work done in this study focuses on communication and data transmission in the context of sensor networks. To improve the reliability of transmission, relays are inserted between the sensors and the destination in order to correct errors in transmissions using LDPC codes. The architecture is optimized thanks to the block codes but also to the error detection protocols and the use of a combination of the error correction and detection. Another interesting way to improve performances is to use multiple antenna systems. Energy efficiency is evaluated in the protocols studied and the solutions proposed. Besides, a joint optimization of channel coding and physical network coding is proposed in this paper
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See, Chong Meng Samson. "Space-time processing for wireless mobile communications." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/25284.
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Intersymbol interference (ISI) and co-channel interference (CCI) are two major obstacles to high speed data transmission in wireless cellular communications systems. Unlike thermal noise, their effects cannot be removed by increasing the signal power and are time-varying due to the relative motion between the transmitters and receivers. Space-time processing offers a signal processing framework to optimally integrate the spatial and temporal properties of the signal for maximal signal reception and at the same time, mitigate the ISI and CCI impairments. In this thesis, we focus on the development of this emerging technology to combat the undesirable effects of ISI and CCL We first develop a convenient mathematical model to parameterize the space-time multipath channel based on signal path power, directions and times of arrival. Starting from the continuous time-domain, we derive compact expressions of the vector space-time channel model that lead to the notion of block space-time manifold, Under certain identifiability conditions, the noiseless vector-channel outputs will lie on a subspace constructed from a set. of basis belonging to the block space-time manifold. This is an important observation as many high resolution array processing algorithms Can be applied directly to estimate the multi path channel parameters. Next we focus on the development of semi-blind channel identification and equalization algorithms for fast time-varying multi path channels. Specifically. we develop space-time processing algorithms for wireless TDMA networks that use short burst data formats with extremely short training data. sequences. Due to the latter, the estimated channel parameters are extremely unreliable for equalization with conventional adaptive methods. We approach the channel acquisition, tracking and equalization problems jointly, and exploit the richness of the inherent structural relationship between the channel parameters and the data sequence by repeated use of available data through a forward- backward optimization procedure. This enables the fuller exploitation of the available data. Our simulation studies show that significant performance gains are achieved over conventional methods. In the final part of this thesis, we address the problem identifying and equalizing multi path communication channels in the presence of strong CCl. By considering CCI as stochasic processes, we find that temporal diversity can be gained by observing the channel outputs from a tapped delay line. Together with the assertion that the finite alphabet property of the information sequences can offer additional information about the channel parameters and the noise-plus-covariance matrix, we develop a spatial temporal algorithm, iterative reweighting alternating minimization, to estimate the channel parameters and information sequence in a weighted least squares framework. The proposed algorithm is robust as it does not require knowledge of the number of CCI nor their structural information. Simulation studies demonstrate its efficacy over many reported methods.
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McPhail, Bernard N. B. (Bernard Nicolas Bruce) Carleton University Dissertation Engineering Electrical. "Error control coding for land mobile communications." Ottawa, 1986.
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Petrus, Paul. "Blind adaptive antenna arrays for mobile communications." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07112009-040414/.
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Chen, Jun. "Multicode CDMA for high-speed mobile communications /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25151241.
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Caldera, Manora K. "Combined coding and modulation in frequency-selective mobile communications." Thesis, Curtin University, 2000. http://hdl.handle.net/20.500.11937/2493.
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Due to constraints on spectrum availability and transmitter power, both bandwidth and power efficient communication techniques are desirable for mobile radio. Continuous phase modulated (CPM) signals have gained attention because of their attractive power spectra (Steele, 1992). It has been shown that the trellis coded modulation (TCM) schemes could provide better bit error rate performances compared to the uncoded schemes (Ungerboeck, 1982). Therefore, the combination of TCM which improves error probability and CPM signals which yield low spectral occupancy is expected to provide good coding and modulation over bandwidth and power limited channels such as the one encountered in mobile radio communications.In this research, a Trellis Coded Modulation (TCM) scheme, which combines convolutional coding and partial response Continuous Phase Modulation (CPM) such as Gaussian Minimum Shift Keying (GMSK), is investigated. Also, this study concentrates on the use of rate-half convolutional codes, and GMSK (B(subscript)0T=0.3). The latter has been adopted in the Global System for Mobile Communications (GSM) system.Appropriate codes are selected assuming Maximum Likelihood Sequence Detection (MLSD) based on the Viterbi algorithm using an extensive computer search. The bit-error-rate (BER) performances of the selected trellis coded GMSK schemes are theoretically evaluated in the presence of additive white Gaussian noise (AWGN) and frequency-flat fading. In the case of fading, the analysis is simplified to assume only amplitude-fading, and without considering the effect of fading on the phase of the received signal.Computer simulations are used to evaluate the BER performances of the proposed trellis coded GMSK schemes in the presence of AWGN and practical impairments, such as sample timing offset and carrier phase errors. Coding gains of up to 2.2dB at a BER of 10(subscript)-3 are obtained under ideal sample timing and carrier recovery conditions. This has been achieved without increasing the receiver complexity based on the number of states in the Viterbi decoder, compared to the uncoded GMSK scheme. Furthermore, these coded schemes are more tolerant to sample timing and carrier phase impairments.Also, the BER performances of the proposed trellis coded GMSK schemes have been extensively investigated by computer simulations for frequency-flat and frequency-selective fading channels. In the case of frequency-selective fading, the Viterbi decoding is made adaptive to cater for the channel impulse response variations with time. With this adaptive receiver, the irreducible BERs of the coded scheme is found to be lower than that of the uncoded. Performance improvements are obtained with a trellis coded GMSK scheme using a constraint length 2 code with a Viterbi decoder of 16 states compared to the 128 states required for the uncoded scheme. Further, the coded scheme has shown less sensitivity to carrier phase errors, compared to the uncoded.
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Raad, Raad. "Neuro-fuzzy admission control in mobile communications systems." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20061030.153500/index.html.
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Manescu, Corneliu. "Video and voice coding for mobile ad-hoc collaboration." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000740.
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Carrere, Jean-Marc. "Antennes multi-norme pour systèmes de communications mobiles." Nice, 2001. http://www.theses.fr/2001NICE5657.
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Ce mémoire présente l’étude d’antennes faible dimension utilisables pour la téléphonie mobile de Troisième Génération. Les antennes de Troisième Génération nécessitent un fonctionnement large bande, multi-bande avec un encombrement dimensionnel le plus faible possible. L’obtention de ces caractéristiques est menée à bien par l’utilisation de courts-circuits filaires, courts-circuits plans, fentes qui permettent d’aboutir à des structures rayonnantes faible dimension mais parfois à faible bande passante, alimentées par sonde coaxiale ou par guide d’ondes coplanaire. La mise en œuvre de l’ensemble de ces techniques permet d’aboutir à une antenne compacte bi-bande GSM/UMTS intégrable dans un téléphone mobile. Dans le cas de faible bande passante, des composants actifs sont intégrés au sein de ces antennes afin de réaliser des antennes commandables en fréquence. Des études sur le comportement de l’ensemble de ces antennes sont réalisées. Elles sont accompagnées d’une interprétation des phénomènes physiques. Les performances réalisables avec ces antennes sont validées par les mesures effectuées sur différents prototypesThis thesis presents the study of small antennas used for Third Generation mobile phone. These antennas need wide and multiple bands, with the smallest size. These characteristics can be obtained by the use of several techniques –shorting post, short circuit planes, slots which allow the obtainment of small antennas, fed by coaxial probe or coplanar waveguide. The used of these various techniques result to compact antenna with dual-band GSM/UMTS which can be integrated in a mobile phone. In case of narrow bandwidth, active components are integrated in these structures to realize frequency agile antennas. Behaviors of these antennas are studied with physical phenomena. Performances of these antennas are validated with measurement of several prototypes
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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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Caldera, Manora K. "Combined coding and modulation in frequency-selective mobile communications." Curtin University of Technology, School of Electrical and Computer Engineering, 2000. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=9820.
Full textAbstract:
Due to constraints on spectrum availability and transmitter power, both bandwidth and power efficient communication techniques are desirable for mobile radio. Continuous phase modulated (CPM) signals have gained attention because of their attractive power spectra (Steele, 1992). It has been shown that the trellis coded modulation (TCM) schemes could provide better bit error rate performances compared to the uncoded schemes (Ungerboeck, 1982). Therefore, the combination of TCM which improves error probability and CPM signals which yield low spectral occupancy is expected to provide good coding and modulation over bandwidth and power limited channels such as the one encountered in mobile radio communications.In this research, a Trellis Coded Modulation (TCM) scheme, which combines convolutional coding and partial response Continuous Phase Modulation (CPM) such as Gaussian Minimum Shift Keying (GMSK), is investigated. Also, this study concentrates on the use of rate-half convolutional codes, and GMSK (B(subscript)0T=0.3). The latter has been adopted in the Global System for Mobile Communications (GSM) system.Appropriate codes are selected assuming Maximum Likelihood Sequence Detection (MLSD) based on the Viterbi algorithm using an extensive computer search. The bit-error-rate (BER) performances of the selected trellis coded GMSK schemes are theoretically evaluated in the presence of additive white Gaussian noise (AWGN) and frequency-flat fading. In the case of fading, the analysis is simplified to assume only amplitude-fading, and without considering the effect of fading on the phase of the received signal.Computer simulations are used to evaluate the BER performances of the proposed trellis coded GMSK schemes in the presence of AWGN and practical impairments, such as sample timing offset and carrier phase errors. Coding gains of up to 2.2dB at a BER of 10(subscript)-3 ++are obtained under ideal sample timing and carrier recovery conditions. This has been achieved without increasing the receiver complexity based on the number of states in the Viterbi decoder, compared to the uncoded GMSK scheme. Furthermore, these coded schemes are more tolerant to sample timing and carrier phase impairments.Also, the BER performances of the proposed trellis coded GMSK schemes have been extensively investigated by computer simulations for frequency-flat and frequency-selective fading channels. In the case of frequency-selective fading, the Viterbi decoding is made adaptive to cater for the channel impulse response variations with time. With this adaptive receiver, the irreducible BERs of the coded scheme is found to be lower than that of the uncoded. Performance improvements are obtained with a trellis coded GMSK scheme using a constraint length 2 code with a Viterbi decoder of 16 states compared to the 128 states required for the uncoded scheme. Further, the coded scheme has shown less sensitivity to carrier phase errors, compared to the uncoded.
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Van, Wyk Daniel Jacobus. "Space-time turbo coding for CDMA mobile communications." Pretoria : [s.n.], 2000. http://upetd.up.ac.za/thesis/available/etd-01172007-112643/.
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An, Kyu Hwan. "CMOS RF power amplifiers for mobile wireless communications." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31717.
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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2010.Committee Chair: Laskar, Joy; Committee Member: Cressler, John; Committee Member: Kohl, Paul; Committee Member: Kornegay, Kevin; Committee Member: Tentzeris, Emmanouil. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Margetts, Adam R. "Joint scale-lag diversity in mobile wideband communications." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1123963618.
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Thesis (Ph. D.)--Ohio State University, 2005.Title from first page of PDF file. Document formatted into pages; contains xviii, 139 p.; also includes graphics (some col.). Includes bibliographical references (p. 130-139). Available online via OhioLINK's ETD Center
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Johansson, Mathias. "Resource Allocation under Uncertainty : Applications in Mobile Communications." Doctoral thesis, Uppsala University, Signals and Systems Group, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4559.
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This thesis is concerned with scheduling the use of resources, or allocating resources, so as to meet future demands for the entities produced by the resources. We consider applications in mobile communications such as scheduling users' transmissions so that the amount of transmitted information is maximized, and scenarios in the manufacturing industry where the task is to distribute work among production units so as to minimize the number of missed orders.
The allocation decisions are complicated by a lack of information concerning the future demand and possibly also about the capacities of the available resources. We therefore resort to using probability theory and the maximum entropy principle as a means for making rational decisions under uncertainty.
By using probabilities interpreted as a reasonable degree of belief, we find optimum decision rules for the manufacturing problem, bidding under uncertainty in a certain type of auctions, scheduling users in communications with uncertain channel qualities and uncertain arrival rates, quantization of channel information, partitioning bandwidth between interfering and non-interfering areas in cellular networks, hand-overs and admission control. Moreover, a new method for making optimum approximate Bayesian inference is introduced.
We further discuss reasonable optimization criteria for the mentioned applications, and provide an introduction to the topic of probability theory as an extension to two-valued logic. It is argued that this view unifies a wide range of resource-allocation problems, and we discuss various directions for further research.
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Chan, Chung-Kei Thomas. "CMOS class E power amplifier for mobile communications." Thesis, Imperial College London, 2003. http://hdl.handle.net/10044/1/8524.
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Freixieiro, Gomes de Mello Rafael. "Design-led future forecasting model for mobile communications." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/13142.
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Since the establishment of the wireless sector, design has been playing a wide range of roles. Specialized literature has been extensively reporting the use of this discipline associated with NPD, focusing on hardware and software development in the mobile communications. On the other hand, evidences of its use to support forecasting are scarce and generic. Finally, formal publications addressing future forecasting from a design perspective in the context of mobile communications have never been reported, leading to a knowledge gap that needs to be addressed. This research investigates the strategic roles, applications and contributions of design and designers for future forecasting in the wireless telecom sector. As a comprehensive discipline, it is used to examine and identify a number of factors that might influence/impact in the development of visionary solutions supporting the design team of traditional handset manufacturers to make better decisions in order to ‘shape’ the future in the wireless industry. Considering these ideas, the aim of this research is to create a ‘design-led future forecasting model for mobile communications’ to assist and support traditional manufacturers’ design team. This PhD study relies on a qualitative methodology comprising a number of data collection and analysis tools (e.g. literature review, case studies analysis, in-depth experts’ interviews, workshops and Grounded Theory). To create the intended framework, extensive secondary and primary data; theoretical and practical inputs were brought together, analysed and combined. The proposed model was evaluated through two rounds of experts’ interviews complemented by two workshops with potential users (e.g. design students) to check and explore its practicalities when applied to design for the future. Finally, this study bridges future forecasting and the wireless telecom through the use of design to address the literature gap. The richness of the developed model provides practical assistance to traditional manufacturer’s design team informing about a broad spectrum of aspects that should be considered when designing for the future in the mobile telecom industry, supporting strategic decision making in different stages of the future-led design process.
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Borison, Torbjorn. "Object Synchronization and Security for Mobile Communications Devices." Thesis, KTH, Mikroelektronik och Informationsteknik, IMIT, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93276.
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The main objective of this master’s thesis project was to investigate and find solutions to the problem of how to combine the SyncML synchronisation specification with object security and thus protection of personal information, such as contacts and calendar entries in mobile devices. SyncML is a new synchronisation specification agreed upon by major device developers (Ericsson, Palm, Motorola, etc.) and the major synchronisation server developers (Starfish, Puma, fusionOne, etc.). It is independent of transport (HTTP, WSP, or OBEX) platform, operating system, and application and simplifies synchronisation of personal information between dissimilar SyncML supportive devices. SyncML compliant devices are fully capable of synchronising information with a third party operated Internet based server and a desktop computer. This allows us to access, up-date and maintain information independent of Intranets or geographical position. However, synchronising and storing confidential personal information on an third party operated Internet based server entails weaknesses in our personal information security. Even if transport and storage security are used, how secure is the server where this information is stored since this server has the highest probability of being attacked. Can we really trust that an employee or other person with valid appropriated administrators access to the storage facility with the appropriate knowledge, working together with the third party server operator, won’t try to access our stored information? To prevent this, the personal information’s confidentiality must be guaranteed before the information leaves the device. When synchronising and exchanging personal information, the information is often marked according to a specific format. The three de-facto standard PIM formats are: (1) vCard (contact information), (2) vCalendar, and (3) iCalendar (calendar and scheduling information). These formats divide the personal information into properties. Each property is assigned to contain a small piece of the personal information entry (e.g. a telephone number, an e-mail address, the time when the calendar event begins, etc.). Furthermore to preserve the interoperability between different devices given by SyncML, authorised recipients must automatically be able to reverse the encryption process and decrypt the encrypted property value. Therefore general cryptographic formats are used (e.g. CMS, PGP and the newly developed XML Encryption). They add information needed by the recipients (e.g. algorithm used, padding method used on the plain text, etc.), encrypt the plaintext into cipher text, and decrypt the cipher text into plain text given the correct key.
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Terry, John D. "Blind adaptive array techniques for mobile satellite communications." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/13425.
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Clarke, Richard. "On Synchronisation Issues in Wireless Mobile Digital Communications." Thesis, University of Canterbury. School of Engineering, 2002. http://hdl.handle.net/10092/1156.
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Symbol timing recovery is an important function of any digital receiver. In the wireless mobile data field the task of establishing accurate symbol timing at the receiver is complicated by the time varying channel. This time varying channel also makes the use of coherent modulation schemes significantly more difficult. This is one of the major reasons that almost all existing mobile wireless digital standards utilise some form of differential modulation and detection. This thesis takes a primarily practical approach to the investigation of timing and phase estimation problems. The main focus of the work is on the comparison of three existing all digital timing synchronisation algorithms, two of which were originally designed for the AWGN channel, and the third was designed from ML principles for the Rayleigh fading channel. In order to test these sub-systems in the wider context of receiver performance, a pilot symbol assisted (PSAM) receiver was simulated to compare the effects of the different synchronisers on receiver steady state performance. Finally, because the real time implementation aspects of software radio are of considerable interest to the author, some attempt has been made to migrate the MATLAB synchronisation simulations to a real time DSP platform, specifically the TMS320C6701 Texas Instruments floating point device.
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Toh, B. Y. "Heterodyne self-steering array characterization for mobile communications." Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390865.
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Batchelor, John. "Annular ring microstrip patch antennas for mobile communications." Thesis, University of Kent, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282579.
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