Dissertations / Theses on the topic 'Personal communicaiton communication service systems'

Thesis (M.E.)--University of Florida, 2001.
Title from title page of source document. Document formatted into pages; contains xi, 76 p.; also contains graphics. Includes vita. Includes bibliographical references.

Thesis (Ph. D.)--University of Oregon, 2002.
Typescript. Includes vita and abstract. Includes bibliographical references (leaves 242-256). Also available for download via the World Wide Web; free to University of Oregon users.

Thesis (M.S.)--University of Florida, 2001.
Title from title page of source document. Document formatted into pages; contains ix, 73 p.; also contains graphics. Includes vita. Includes bibliographical references.

Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.
Laskar, Joy, Committee Chair ; Cressler, John, Committee Member ; Kornegay, Kevin, Committee Member ; Tentzeris, Emmanouil, Committee Member ; Lee, Chang-Ho, Committee Member.

Mobile commerce, due to its inherent characteristics of mobility and reachability in enhancing personalized services provides an excellent means for life insurers to exploit such avenue in their service offerings. The objective of this study was to determine whether mobile commerce can be used to improve the services of life insurance post-sale activities. This objective was achieved with the relevant literature and empirical study. To accomplish the objective of this treatise, a triangulated research approach was selected and a multiple-case study consisting of four cases was conducted. The four cases selected comprised of leading insurers with large market share in the life insurance market in South-Africa. The primary data were collected through questionnaire and face-to-face interviews with selected respondents. The main finding shows that the respondents had a positive view about mobile commerce and its application in their companies. This was demonstrated by 80 percent of respondents who agreed that mobile commerce was more of an opportunity rather than a challenge or even a threat for the life insurance market. The results also indicate that customer relationship management, mobile messaging services and field service automation functions were used by all the insurers; although minor discrepancies were observed due to the efficiency of each firms IT infrastructure. The Internet was found to assist in the collection of more precise data, to increase service performing abilities. Some of the major obstacles that were found to hinder the deployment of mobile commerce in the industry were security concerns, low and infrequent internet usage and performance by supporting industries. Cumbersome and inefficient legacy systems were declared as the greatest technological weakness particularly by respondents from case 1 and 2. Conversely, hardware and network infrastructure, lack of software packages, lack of technical expertise and the fear of disintermediation was rated low in hindering the deployment of mobile commerce. However, according to the findings the key benefits derived from engaging in increased mobile commerce activities include enhancing customer contact and service, more transparency and speed of claims management, increasing client retention and policy extension rates hence increasing overall company profit.

L’apparition du SMS, il y a déjà plusieurs années, a egendré des logiques d’adoption

différentes. Dès son premier usage, le SMS était vu par les compagnies de téléphonie mobile

comme un moyen de transmission d’informations utiles pour les adultes – l’évolution de la

Bourse, des informations sur la météo (Ling, 2001). Par son passage à l’adoption par les

jeunes dans les années 1995 et 1997 et jusqu’aujourd’hui, le SMS devient un phénomène qui

suscite des représentations diverses et des discours assez contradictoires, même virulents par

rapport à son appropriation par les jeunes. Si, dans l’espace francophone et anglophone, le

sujet du “langage SMS” est bien connu, constituant une figure récurrente des discours des

mass-médias et des enseignants qui sortent en évidence les effets négatifs sur les compétences

orthographiques des élèves, ailleurs, et notamment en Roumanie, les discours des massmédias

constatent l’existence du phénomène, sans mettre en évidence les aspects négatifs, s’il

en existe. Un autre registre est celui de l’espace soi-disant virtuel, où des sites Internet relèvent les divers usages du SMS dans le monde3, dans le cadre des diverses industries (le politique4, les

services publics5, le divertissement6). Hors de ces présences qui attestent l’explosion de la

communication par l’intermédiaire du SMS, il existe aussi, par exemple, des concours de

poésie par SMS: leur enjeu est de voir comment la créativité individuelle peut être compactée

en 160 caractères, en résultant un possible mélange entre le hai-ku et cette technologie de

dernière génération. Le SMS, dont on décriera l’évolution plus tard, dépasse ainsi ses

fonctions primaires de communication et de socialisation, en devenant un milieu de créativité

et d’innovation artistique.La vie quotidienne est aussi un domaine où le SMS est très visible et qui détermine la création d’une représentation collective qui attribuerait le SMS aux jeunes à part d’autre type de public. Constamment, autour de soi, on peut voir des jeunes utilisant le téléphone mobile pour envoyer des messages. La scène déjà évoquée, issue de mes observations

ethnographiques, en est particulièrement illustrative. Toutes ces contextes donnent une présence active de l’usage du SMS. A chaque

contexte, un discours spécifique. Cette diversité contextuelle et discursive incontestable a

constitué une première raison d’approfondir le sujet du SMS. Alors, la question fondamentale surgit :comment peut-on traiter d’un tel sujet ?Quelle est la « bonne » voie interprétative ?Nous nous proposons de relier deux aspects, la

communication et les usages, ce qui nous semble essentiel pour la construction de l’objet du

SMS. Il s’agit donc d’étudier les discours caractéristiques de la culture des jeunes, sur le plan des pratiques comme des représentations, en mettant un accent particulier sur leur façon de

construire des stratégies pour surmonter les contraintes imposées par l’objet technique (le

SMS présente en fait des caractéristiques linguistiques liées aux spécificités du support

technique) mais aussi sur leur façon de « se mettre en scène » dans les SMS. Nous verrons

ainsi en quoi il y a une prise en compte des règles du groupe de pairs dans la culture

adolescente, en même temps qu’une élaboration de stratégies de distanciation. C’est la

démarche spécifique à l’anthropologie de la communication. On pourrait aborder le SMS en mobilisant les approches de réseau, dans des termes de fonctionnabilité du réseau, de rôles de chaque acteur qui y participe et du principe du pouvoir qui leur serait intrinsèque (Latour 1991) :le message reçu par le jeune légitime la bonne

fonctionnalité du réseau, dont les autres jeunes font partie, ainsi que leurs positions à

l’intérieur du réseau social. Le fait d’avoir partagé le SMS est un signe de pouvoir symbolique

envers les autres. Ces approches omettent cependant un aspect que nous considérons comme

important, à savoir le caractère ludique, que ce soit le ludique intrinsèque du message

(exprimé par un contenu amusant, une blague, un ragot, etc.) ou le ludique extérieur du

message (exprimé par l’acte d’envoyer un message, qui surmonte l’ennui temporel).

J’argumenterai que le ludique est le facteur qui explique le grand succès du SMS et de sa

consolidation auprès des jeunes.

Par rapport à la constitution de l’anthropologie comme discipline, les études

anthropologiques de nouvelles technologies informationnelles et communicationnelles

(NTIC) sont apparues très récemment, au cours des années 1990 du dernier siècle. S’agissant

d’un groupe assez réduit de chercheurs qui, en plus, ne connaissaient pas les travaux de leurs

pairs, les études initiales étaient plutôt descriptives et empiriques ;le SMS y était présenté en tant qu’une réalité « exotique ». Son « exotisme » a penché sur le discours anthropologique assez longtemps, jusqu’à la fin des années 1990, quand l’anthropologie fait son bilan et elle découvre que la période des études descriptives doit finir et commencer l’étape de

problématisation. Ainsi, les anthropologues se ciblent sur le rapport entre le nouveau et

l’ancien dans la communication médiatisée par NTIC, commencent à rechercher dans le passé

des usages similaires, pour construire une théorie des nouveaux modèles communicationnels.

L’anthropologie de la communication du fin des années 1990 et le début des 20008

s’éloigne de la sociologie par sa démarche diachronique et comparative. L’usage est remplacé

par le concepte de la pratique (ce qui impliquait une interprétation des usages dans leur

dynamique). Par la suite, la perspective synchronique laisse la place à une démarche

diachronique, les anthropologues décrivant la façon dont les pratiques communicationnelles

d’un certain médium prennent des nouvelles significations, en fonction de contexte et des

individus. Si la sociologie réalisait des comparaisons entre les usages des divers NTIC dans le même contexte temporel, l’anthropologie de la communication emploie la méthode

comparatiste au niveau diachronique aussi. L’ancien et le nouveau dans la communication

médiatisée par NTIC constituent la cible scientifique des anthropologues. Cette focalisation est importante aussi pour la spécialisation de l’objet de la recherche ;son évolution poursuit le schème suivant en anthropologie de la communication :NTIC → type d’objet électronique (téléphone mobile, ordinateur, tam-tam etc) → une fonctionnalité de l’objet technologique qui connaît des développement surprenants (SMS, vidéo-appel, MMS, chat, Instant Messenger,Facebook, MySpace etc). On passe de la « computer mediated communication » aux pratiques communicationnelles spécifiques à chaque fonctionnalité, de singulier au pluriel.

Il n’est resté que peu de temps jusqu’à ce que l’objet technologique devienne sujet des

interrogations dans la culture matérielle. De date très récente, dans l’espace anglo-saxon9 et

francophone10, ces études mettent dans le centre de leur analyse la relation entre l’individu et

l’objet technologique, donc la consommation. Les rapports entre les deux instances de la

relation décrivent deux directions de l’action :l’incorporation de l’objet (l’objet agit sur

l’individu) et l’excorporation de l’objet (l’individu agit sur l’objet). Cette relation est vue dans ces concrétisations en divers lieux du monde, les anthropologues présentant une localisation des pratiques et des représentations d’un certain objet technologique. La culture matérielle reprend la dimension synchronique d’un objet technologique (les usages en divers contextes)dans le cadre plus large diachronique, segmenté en fonction des étapes d’appropriation :

l’adoption, la création de l’utilité, la consolidation des usages. Cette trajectoire de l’objet décrit une démarche paradigmatique, dont chaque étape est construite par les pratiques et les représentations créées par les usagers. Le processus d’appropriation est donc le cadre

théorique plus large dans lequel les anthropologues intègrent les conceptes de la sociologie et de l’anthropologie communicationnelle. Influencée par la sémiotique, la culture matérielle décrit, donc, les significations complexes de la relation entre l’individu et l’objet technologique (que nous allons décrire en détail dans le premier chapitre de la thèse). On comprend assez facilement pourquoi le téléphone mobile est un objet technologique soumis au processus d’appropriation, mais pourrait-on dire que le SMS est un objet de consommation ?

Gérald Gaglio ainsi l’interprète :« Ce tour d'horizon a permis d'identifier les étapes de la

diffusion d'une nouvelle pratique sociale liée à un support technique, le SMS. Elle apparaît

suite à une ruse qui consiste à contourner le coût de l'appel téléphonique et profite d'un effet

de réseau. Elle s'enrichit de la création d'un univers de sens puis interpelle par l'action d'une "

minorité active " constituée par les adolescents. Elle sort enfin de son contexte de création

9 Heather Horst et Daniel Miller 2006, The cell phone: An Anthropology of communication, Berg. In press,

Oxford.

10 Bernard Blandin 2002, La construction du social par les objets, Presses Universitaires de France, Paris.

11

puisqu'elle est appropriée par d'autres populations qui élargissent les types de contenus

transmis. »11

Dominique Desjeux partage la même opinion quand elle compare la diffusion du SMS

en Chine, France et Pologne: « In the field of telephony, mobile or fixed, and more generally

in that of electronic information technologies, SMS is an interesting example of the spread of

an innovation because it has occurred without the need for any special marketing action. Its

spread has been spontaneous except in Poland where the later arrival of SMS meant that it

was immediately associated with uses of mobile phones. Hence, its success is linked to

invisible uses and associations that existed potentially in society before the expansion of

SMS. It is interesting to review these in order to understand at least partially the logic

underlying the spread of future innovations. Hence the purpose of this article is to show the

invisible uses that have been gradually revealed by surveys on SMS practices, especially

qualitative ones and mostly on a micro-social scale, carried out in France (partly under my

direction) by Catherine Lejealle (2003), in Poland by Malgorzata Kamieniczna (2004) and in

China by Anne Sophie Boisard (2004). Another aim is to show the shared or singular

practices of the three cultures analysed. The social uses of SMS in the world fit into a

dynamic that is constantly evolving among users, from the youngest to the oldest, and are

based on a written expression that constantly invents new codes or forms of the written

language. »12

Les deux chercheurs se situent en continuité avec notre grille d’analyse ;tous les deux

reconnaissent l’émergence du SMS dans des pays différents, dans le cadre des sous-cultures

délimitées par l’âge. G. Gaglio et D. Desjeux voient dans la pratique du SMS un exemple de

détournement du préscrit, déterminé par la capacité des usagers d’innover. Influencés par la

thèorie de Norbert Alter sur l’innovation ordinaire13, les deux anthropologues, à la suite d’une

démarche comparative entre plusieurs espaces, considèrent que le SMS est un objet de

consommation. Ses développements différents, les pratiques changeantes, expression d’une

créativité individuelle et collective, font que le SMS accomplisse « les conditions » pour être

considéré un objet soumis au processus complexe de la consommation.

11 Gérald Gaglio, 2005, “La pratique du SMS en France: analyse d'un comportement de consommation in tant

que phénomène social”, Paris, Consommations et société n°4, electronic journal, www.argonautes.fr

12 Dominique Desjeux ,2005, „SMS uses and issues in China, France and Poland”, Paris, Consommations et

société n°4, electronic journal, www.argonautes.fr.

13 Norbert Alter, 2000, L'innovation ordinaire, Paris, PUF.

12

Cette façon d’aborder le SMS est celle que nous suivrons aussi ;quand même,

l’explication de l’émergence du SMS ne nous suffit pas. Considérer l’explosion du SMS

comme ayant ses racines que dans la capacité créative des usagers (les innovateurs ordinaires)

nous semble une explication un peu aride, qui laisse à coté les conditions du contexte qui ont

fait que le détournement se réalise. Et, en plus, en quoi consiste-t-elle, cette capacité créative ?

Suffit-il de le nommer pour expliquer tout un phénomène ?Quels sont donc les ressorts

intérieurs du passage de « manières de faire » aux « arts de faire »14 ?

Ces sont des questionnements qui font de SMS un objet qui peut être soumis à une

interrogation scientifique et à tout un travail de terrain.
Doctorat en Sciences politiques et sociales
info:eu-repo/semantics/nonPublished

The Internet Engineering Task Force (IETF) has recently released routing standards that allow deployment of TCP/IP local area networks (LANs) onboard a moving vehicle and yet maintain permanent connectivity of the onboard LAN to the Internet via a vehicular mobile router. This recent development opens up new opportunities for providing efficient mobile computing for users on the move, especially for commuters traveling on public transports. Supporting real-time communications, e.g. IP Telephony, on-line video on demand, etc., over such onboard mobile networks is the main motivation of this thesis. Due to the volatility of the wireless bandwidth available to connect the moving LAN to the Internet at different locations of the trip, supporting on-line services that require bandwidth guarantees becomes a challenging task. The main problem investigated is how to provide bandwidth guarantee efficiently, effectively, and in a scalable manner in the context of moving onboard networks. To achieve the goal, a systematic approach is taken that involves (i) designing a signalling protocol that allows transparent bandwidth reservation for the aggregate demand of all onboard users in the vehicle, and (ii) proposing effective aggregation and bandwidth reservation policies that aim to maximize the chances of successful reservation and minimize the bandwidth and processing overhead in critical network elements. Mathematical models are derived to evaluate the performance of proposed solutions. These models are validated using discrete event simulation. One important conclusion reached is that onboard mobile communication provides significant aggregation and centralized management opportunities that must be exploited to provide a scalable solution to the bandwidth guarantee problem in mobile communications. The techniques proposed and analyzed in this thesis to exploit such aggregation opportunities constitute the original contribution to knowledge.

by Lee Ying Kit.
Thesis (M.Phil.)--Chinese University of Hong Kong, 1996.
Includes bibliographical references (leaves 79-[83]).
Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- Overview of Personal Communication Systems --- p.1
Chapter 1.2 --- Design issues on PCS --- p.2
Chapter 1.2.1 --- Channel allocation --- p.2
Chapter 1.2.2 --- Multiple Access --- p.3
Chapter 1.2.3 --- Handoffs --- p.4
Chapter 1.2.4 --- Location management --- p.6
Chapter 1.3 --- Motivation of this thesis --- p.9
Chapter 1.4 --- The theme of this thesis --- p.10
Chapter 1.4.1 --- Methodology --- p.10
Chapter 1.4.2 --- The system model and assumptions --- p.12
Chapter 1.4.3 --- Outline of the thesis --- p.13
Chapter 2 --- Overview of the traditional location update schemes --- p.15
Chapter 2.1 --- Why do we need location registration? --- p.15
Chapter 2.2 --- Location registration by Geographic and Time based methods --- p.16
Chapter 2.2.1 --- Geographic Based Registration Schemes --- p.16
Chapter 2.2.2 --- Time Based Registration Scheme --- p.20
Chapter 2.3 --- Peformance Analysis of protocols --- p.20
Chapter 2.3.1 --- Analytical Results --- p.22
Chapter 2.3.2 --- A Numerical Study --- p.23
Chapter 2.4 --- Summary of the results for time and geographic based location update protocol --- p.24
Chapter 3 --- The Implementation of Bloom filter on location registration --- p.27
Chapter 3.1 --- Introduction --- p.27
Chapter 3.2 --- The Implementation of Bloom filter on location registration --- p.29
Chapter 3.2.1 --- Location Update by Bloom filter --- p.29
Chapter 3.2.2 --- Paging algorithm --- p.29
Chapter 3.2.3 --- An example --- p.30
Chapter 3.3 --- Performance evaluation of the Bloom filter based location update scheme --- p.32
Chapter 3.4 --- Summary of the results for Bloom filter based scheme --- p.35
Chapter 4 --- One-Bit-Reply protocol --- p.36
Chapter 4.1 --- Introduction --- p.36
Chapter 4.2 --- One-Bit-Reply protocol --- p.37
Chapter 4.2.1 --- Grouping of MU's --- p.38
Chapter 4.2.2 --- The Update Procedure --- p.39
Chapter 4.2.3 --- Paging algorithm --- p.40
Chapter 4.3 --- Performance evaluation of the OBR protocol --- p.42
Chapter 4.3.1 --- Analytical Results --- p.42
Chapter 4.3.2 --- A Simulation Study --- p.43
Chapter 4.4 --- Comparison of the location registration schemes - A numerical study --- p.45
Chapter 4.5 --- Summary --- p.46
Chapter 5 --- A case study - Implementing the OBR protocol on GSM sytems --- p.49
Chapter 5.1 --- Introduction --- p.49
Chapter 5.2 --- The Architecture of Global System for Mobile Communicaitons (GSM) --- p.50
Chapter 5.3 --- Location Update Procedure of GSM --- p.51
Chapter 5.4 --- Implementing OBR protocol on GSM --- p.52
Chapter 5.5 --- Influence of the OBR on the VLR's and HLR --- p.55
Chapter 5.5.1 --- Analysis of traditional method --- p.57
Chapter 5.5.2 --- Analysis of OBR --- p.58
Chapter 5.6 --- Summary --- p.59
Chapter 6 --- Conclusion --- p.61
Chapter 6.1 --- Summaries of Results --- p.61
Chapter 6.1.1 --- Cost functions --- p.61
Chapter 6.1.2 --- Optimization of the cost functions --- p.62
Chapter 6.1.3 --- Implementation of OBR into GSM --- p.64
Chapter 6.2 --- Suggestions for further researches --- p.64
Appendix --- p.65
Chapter A --- Derivation of cost functions --- p.66
Chapter A.1 --- Geographic based scheme --- p.66
Chapter A.2 --- Time based scheme --- p.67
Chapter A.3 --- Bloom filter based scheme --- p.68
Chapter B --- On the optimality of the cost functions --- p.71
Chapter B.1 --- Steepest Descent Algorithm for various protocols --- p.71
Chapter B.2 --- Bloom filter based scheme --- p.72
Chapter B.3 --- Time Based Scheme --- p.74
Chapter B.4 --- One-Bit-Reply scheme --- p.75
Chapter B.5 --- Geographic Based Scheme --- p.75
Chapter C --- Simulation of OBR --- p.77
Bibliography --- p.79

Wireless spectral efficiency is increasingly important due to the rapid growth of demand for high data rate wideband wireless services. The design of a multi-carrier system,such as an orthogonal frequency division multiple access (OFDMA) system, enables high system capacity suited for these wideband wireless services. This system capacity can be further optimised with a resource allocation scheme by exploiting the characteristics of the wireless fading channels. The fundamental idea of a resource allocation scheme is to efficiently distribute the available wireless resources, such as the sub-carriers and transmission power, among all admitted users in the system. In this thesis, we present the findings of the investigation into the impact of several resource allocation schemes in an OFDMA environment. We show that in an OFDMA environment without the consideration of sub-carrier assignment, the sub-optimal power allocation closed-form solution can be derived via a constrained optimisation with the duality theorem. With a perfect feedback of channel condition, the proposed low-complexity algorithm that utilises the closed-form solution can maximise the sum capacity to approach near-optimal capacity. We derive the sub-optimal sub-carrier and power allocation closed-form solution via a similar constrained optimisation process. With an imperfect or outdated feedback of channel condition, the adaptive sub-carrier and power allocation scheme not only fails to improve but also further deteriorates the system throughput. We present and discuss the formation of the finite-state Markov channel. We show that by using the dynamics of the Markov channel, the channel quality can be reliably predicted in advance. We analyse via simulation the spectral efficiency achieved by this channel prediction scheme on an OFDMA system. We address the importance of fairness in resource allocation from a game-theoretic perspective. With different utility and preference functions that best describe the gain in users’ throughput as more sub-carriers are allocated to the individual user, we formulate the resource allocation problem into cooperative and non-cooperative games. We study via simulation the effectiveness and fairness of the cooperative and non-cooperative resource allocation schemes on an OFDMA system. Finally, we draw conclusions on our research work and outline the future research topics in connection with our current studies.
Thesis(PhD) -- School of Electrical and Electronic Engineering, 2007

by Yue Ping Zhang.
Publication date from spine.
Thesis (Ph.D.)--Chinese University of Hong Kong, 1995.
Includes bibliographical references (leaves 194-200).
DEDICATION
ACKNOWLEDGMENTS
Chapter
Chapter 1. --- Introduction --- p.1
Chapter 1.1 --- Brief Description of Tunnels --- p.1
Chapter 1.2 --- Review of Tunnel Imperfect Waveguide Models --- p.2
Chapter 1.3 --- Review of Tunnel Geometrical Optical Model --- p.4
Chapter 1.4 --- Review of Tunnel Propagation Experimental Results --- p.6
Chapter 1.5 --- Review of Existing Tunnel UHF Radio Communication Systems --- p.13
Chapter 1.6 --- Statement of Problems to be Studied --- p.15
Chapter 1.7 --- Organization --- p.15
Chapter 2 --- Propagation in Empty Tunnels --- p.18
Chapter 2.1 --- Introduction --- p.18
Chapter 2.2 --- Propagation in Empty Tunnels --- p.18
Chapter 2.2.1 --- The Imperfect Empty Straight Rectangular Waveguide Model --- p.19
Chapter 2.2.2 --- The Hertz Vectors for Empty Straight Tunnels --- p.20
Chapter 2.2.3 --- The Propagation Modal Equations for Empty Straight Tunnels --- p.23
Chapter 2.2.4 --- The Propagation Characteristics of Empty Straight Tunnels --- p.26
Chapter 2.2.5 --- Propagation Numerical Results in Empty Straight Tunnels --- p.30
Chapter 2.3 --- Propagation in Empty Curved Tunnels --- p.36
Chapter 2.3.1 --- The Imperfect Empty Curved Rectangular Waveguide Model --- p.37
Chapter 2.3.2 --- The Hertz Vectors for Empty Curved Tunnels --- p.39
Chapter 2.3.3 --- The Propagation Modal Equations for Empty Curved Tunnels --- p.41
Chapter 2.3.4 --- The Propagation Characteristics of Empty Curved Tunnels --- p.43
Chapter 2.2.5 --- Propagation Numerical Results in Empty Curved Tunnels --- p.47
Chapter 2.4 --- Summary --- p.50
Chapter 3 --- Propagation in Occupied Tunnels --- p.53
Chapter 3.1 --- Introduction --- p.53
Chapter 3.2 --- Propagation in Road Tunnels --- p.53
Chapter 3.2.1 --- The Imperfect Partially Filled Rectangular Waveguide Model --- p.54
Chapter 3.2.2 --- The Scalar Potentials for Road tunnels --- p.56
Chapter 3.2.3 --- The Propagation Modal Equations for Road Tunnels --- p.59
Chapter 3.2.4 --- Propagation Numerical Results in Road Tunnels --- p.61
Chapter 3.3 --- Propagation in Railway Tunnels --- p.64
Chapter 3.3.1 --- The Imperfect Periodically Loaded Rectangular Waveguide Model --- p.65
Chapter 3.3.2 --- The Surface Impedance Approximation --- p.66
Chapter 3.3.2.1 --- The Surface Impedance of a Semi-infinite Lossy Dielectric Medium --- p.66
Chapter 3.3.2.2 --- The Surface Impedance of a Thin Lossy Dielectric Slab --- p.67
Chapter 3.3.2.3 --- The Surface Impedance of a Three-layered Half Space --- p.69
Chapter 3.3.2.4 --- The Surface Impedance of the Sidewall of a Train in a Tunnel --- p.70
Chapter 3.3.3 --- The Hertz Vectors for Railway Tunnels --- p.71
Chapter 3.3.4 --- The Propagation Modal Equations for Railway Tunnels --- p.73
Chapter 3.3.5 --- The Propagation Characteristics of Railway Tunnels --- p.76
Chapter 3.3.6 --- Propagation Numerical Results in Railway Tunnels --- p.78
Chapter 3.4 --- Propagation in Mine Tunnels --- p.84
Chapter 3.4.1 --- The Imperfect periodically Loaded Rectangular Waveguide Model --- p.85
Chapter 3.4.2 --- The Hertz Vectors for Mine Tunnels --- p.86
Chapter 3.4.3 --- The Propagation modal Equations for Mine Tunnels --- p.88
Chapter 3.4.4 --- The Propagation Characteristics of Mine Tunnels --- p.95
Chapter 3.4.5 --- Propagation Numerical Results in Mine Tunnels --- p.96
Chapter 3.5 --- Summary --- p.97
Chapter 4 --- Statistical and Deterministic Models of Tunnel UHF Propagation --- p.100
Chapter 4.1 --- Introduction --- p.100
Chapter 4.2 --- Statistical Model of Tunnel UHF Propagation --- p.100
Chapter 4.2.1 --- Experiments --- p.101
Chapter 4.2.1.1 --- Experimental Set-ups --- p.102
Chapter 4.2.1.2 --- Experimental Tunnels --- p.104
Chapter 4.2.1.3 --- Experimental Techniques --- p.106
Chapter 4.2.2 --- Statistical Parameters --- p.109
Chapter 4.2.2.1 --- Parameters to Characterize Narrow Band Radio Propagation Channels --- p.109
Chapter 4.2.2.2 --- Parameters to Characterize Wide Band Radio Propagation Channels --- p.111
Chapter 4.2.3 --- Propagation Statistical Results and Discussion --- p.112
Chapter 4.2.3.1 --- Tunnel Narrow Band Radio Propagation Characteristics --- p.112
Chapter 4.2.3.1.1 --- Power Distance Law --- p.114
Chapter 4.2.3.1.2 --- The Slow Fading Statistics --- p.120
Chapter 4.2.3.1.3 --- The Fast Fading Statistics --- p.122
Chapter 4.2.3.2 --- Tunnel Wide Band Radio Propagation Characteristics --- p.125
Chapter 4.2.3.2.1 --- RMS Delay Spread --- p.126
Chapter 4.2.3.2.2 --- RMS Delay Spread Statistics --- p.130
Chapter 4.3 --- Deterministic Model of Tunnel UHF Propagation --- p.132
Chapter 4.3.1 --- The Tunnel Geometrical Optical Propagation Model --- p.134
Chapter 4.3.2 --- The Tunnel Impedance Uniform Diffracted Propagation Model --- p.141
Chapter 4.3.2.1 --- Determination of Diffraction Points --- p.146
Chapter 4.3.2.2 --- Diffraction Coefficients for Impedance Wedges --- p.147
Chapter 4.3.3 --- Comparison with Measurements --- p.151
Chapter 4.3.3.1 --- Narrow Band Comparison of Simulated and Measured Results --- p.151
Chapter 4.3.3.1.1 --- Narrow Band Propagation in Empty Straight Tunnels --- p.151
Chapter 4.3.3.1.2 --- Narrow Band Propagation in Curved or Obstructed Tunnels --- p.154
Chapter 4.3.3.2 --- Wide Band Comparison of Simulated and Measured Results --- p.158
Chapter 4.3.3.2.1 --- Wide Band Propagation in Empty Straight Tunnels --- p.159
Chapter 4.3.3.2.2 --- Wide Band Propagation in an Obstructed Tunnel --- p.163
Chapter 4.4 --- Summary --- p.165
Chapter 5 --- Propagation in Tunnel and Open Air Transition Region --- p.170
Chapter 5.1 --- Introduction --- p.170
Chapter 5.2 --- Radiation of Radio Waves from a Rectangular Tunnel into Open Air --- p.171
Chapter 5.2.1 --- Radiation Formulation Using Equivalent Current Source Concept --- p.171
Chapter 5.2.2 --- Radiation Numerical Results --- p.175
Chapter 5.3 --- Propagation Characteristics of UHF Radio Waves in Cuttings --- p.177
Chapter 5.3.1 --- The Attenuation Constant due to the Absorption --- p.178
Chapter 5.3.2 --- The Attenuation Constant due to the Roughness of the Sidewalls --- p.182
Chapter 5.3.3 --- The Attenuation Constant due to the tilts of the Sidewalls --- p.183
Chapter 5.3.4 --- Propagation Numerical Results in Cuttings --- p.184
Chapter 5.4 --- Summary --- p.187
Chapter 6 --- Conclusion and Recommendation for Future Work --- p.189
APPENDIX --- p.193
The Approximate Solution of a Transcendental Equation --- p.193
REFERENCES --- p.194

by Wing Ho Andy Yuen.
Thesis (M.Phil.)--Chinese University of Hong Kong, 1997.
Includes bibliographical references (leaves 85-[90]).
Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- Design Issues in Wireless Cellular Systems --- p.1
Chapter 1.1.1 --- Channel Assignment --- p.2
Chapter 1.1.2 --- Handoff --- p.3
Chapter 1.1.3 --- Multiple Accesses --- p.3
Chapter 1.1.4 --- Mobility Management --- p.4
Chapter 1.2 --- Motivation of the thesis --- p.5
Chapter 1.3 --- Outline of the thesis --- p.6
Chapter 2 --- Background Studies --- p.9
Chapter 2.1 --- Current Standards --- p.9
Chapter 2.2 --- Mobility Models --- p.11
Chapter 2.2.1 --- Fluid Flow Model --- p.12
Chapter 2.2.2 --- Markovian model --- p.13
Chapter 2.3 --- Dynamic versus Static Location Strategy --- p.14
Chapter 2.4 --- Location Registration Strategies --- p.14
Chapter 2.4.1 --- Time Based Strategy --- p.15
Chapter 2.4.2 --- Geographic Based Strategy --- p.17
Chapter 2.4.3 --- Distance Based Strategy --- p.18
Chapter 2.4.4 --- Miscellaneous Strategies --- p.19
Chapter 2.5 --- Summary --- p.20
Chapter 3 --- Hybrid Bloom Filter Location Update Algorithm --- p.21
Chapter 3.1 --- Introduction --- p.21
Chapter 3.2 --- System Model --- p.22
Chapter 3.3 --- Hybrid Bloom Filter Algorithm --- p.23
Chapter 3.3.1 --- Location Update Protocol --- p.23
Chapter 3.3.2 --- Paging Protocol --- p.25
Chapter 3.4 --- Performance Evaluation --- p.27
Chapter 3.4.1 --- Comparison of the hybrid and time based Bloom filter algorithms --- p.32
Chapter 3.5 --- Numerical Studies --- p.33
Chapter 3.5.1 --- Cost versus mobility --- p.34
Chapter 3.5.2 --- Cost versus call arrival rate --- p.37
Chapter 3.6 --- Summary --- p.39
Chapter 4 --- A Dynamic Location Area Assignment Algorithm --- p.40
Chapter 4.1 --- Geographic versus Distance Based Strategies --- p.41
Chapter 4.2 --- System Model --- p.42
Chapter 4.2.1 --- cell layout --- p.42
Chapter 4.2.2 --- mobility model --- p.43
Chapter 4.2.3 --- cost function --- p.44
Chapter 4.3 --- Dynamic Location Area Assignment Algorithm --- p.45
Chapter 4.3.1 --- Measurement --- p.46
Chapter 4.3.2 --- "Computation of (iopt, jopt)" --- p.46
Chapter 4.3.3 --- Computation of location area size k --- p.51
Chapter 4.4 --- Numerical Studies --- p.52
Chapter 4.5 --- Summary --- p.57
Chapter 5 --- Paging Cost Reduction Using Bloom Filtering As Auxilliary Strategy --- p.64
Chapter 5.1 --- Introduction --- p.64
Chapter 5.2 --- A Case Study - Joint DLA-HBF Algorithm --- p.65
Chapter 5.2.1 --- The Algorithm --- p.65
Chapter 5.2.2 --- Performance Evaluation --- p.67
Chapter 5.3 --- Summary --- p.68
Chapter 6 --- Conclusion --- p.70
Chapter 6.1 --- Summary of Results --- p.70
Chapter 6.2 --- Future Research Directions --- p.71
Appendix --- p.73
Chapter A --- Optimality of the Hybrid Bloom Filter Algorithm --- p.73
Chapter B --- Derivation of the Expected First Passage Time ExTi and EyTj --- p.77
Chapter C --- Optimality of the Dynamic Location Area Algorithm --- p.81
Bibliography --- p.85

In the past, the design of PC algorithms for CDMA systems has remained at the physical layer to compensate for slow and fast channel impairments (known as fast PC and slow PC). The TDMA/FDMA manages inter-cell interference at the beginning of the radio planning process. In SS technology, real time adaptive PC and power management algorithms would need to work coherently to ensure reliable multi-media services, and the need for this real-time hybrid structure of PC and power management has only been shown recently. The emphasis in this dissertation is therefore on the design of a QoS-based PC structure in W-CDMA applications, the ultimate goal being to evaluate the new QoS-based PC structure by means of a Monte Carlo computer simulation; a multi-user, multimedia W-CDMA simulation package. Before the design of the QoS-based PC structure, this dissertation examines and proposes a new power-sensitive model that addresses factors affecting the W-CDMA system capacity. Consequently, PC problems are put into a framework for various optimization criteria. Finally the design of a QoS-based PC structure by means of Monte Carlo computer simulation is described and evaluate. The first problem is closely related to the fact that W-CDMA is a design of a power management network architecture. The power management can co-exist in every layer of operation with different specific time scale and optimization objectives. The solution to this problem is therefore to introduce a general and mathematically tractable power-sensitive model to identify factors that influence the capacity of W-CDMA cellular systems and then articulate the general power sensitive model to form a PC framework aimed at finding a common systematic treatment for different schools of thought on PC algorithms. This dissertation proves the benefits of layered PC operation for guaranteed QoS transmission and also shows that this research coincides with and extend the literature on PC management by categorizing PC algorithms according to various optimization objectives and time scales. The second problem is to evaluate the new QoS-based PC structure in a channel coded and RAKE combining uplink UMTSIUTRA cellular environment using the Monte Carlo simulation package. The UMTS radio channel models are described in terms of frequency-selective Rayleigh fading: Indoor-Office, Outdoor and Pedestrian and Vehicular environments. The package is simulated in Matlab. The influence of the number of multipath components, of Doppler Spread, the number of received antenna, the coding scheme and multi-access interference are discussed in the dissertation. The performance evaluation criteria for utility-based PC structures are Bit-Error-Rate (BER) performance (robustness), outage performance (tracking ability) and rate of convergence. The first test shows that the new proposed unbalanced step-size closed-loop FPC schemes can provide better SINR tracking ability and better BER performance than conventional balanced step-size PC schemes. The unbalanced FPCs have better PC error distribution in all scenarios. The second test shows that the proposed BER-prediction distributed OPC schemes can provide better BER tracking ability. This scheme converges iteratively to an optimal SINR level under current network settings with no excessive interference to other active users.
Dissertation (M Eng (Electronics))--University of Pretoria, 2006.
Electrical, Electronic and Computer Engineering
Unrestricted

In the design of the third generation of multi-media wireless networks, we are primarily concerned with the greatly varying information source rates, the quality requirements of various traffic types, the characteristics of the wireless environment, as well as the complexity and cost. Code Division Multiple Access (CDMA) cellular system is one of the most important candidates for supporting the future universal communications services. The objective of this research is to improve the capacity and the quality of service (QOS), as well as to reduce the complexity of cellular CDMA with integrated services, through improving or optimizing the design of system level operations. To facilitate the system performance and capacity evaluation, the multi-cell multi-user interference is analyzed through a new approach. The area averaged probability density function (PDF) of interference power from one active user is evaluated. The Gamma distribution is proposed for modelling the area averaged PDF of the interference power. An efficient method for evaluating system performance is developed. Differing from the Gaussian approximation, this method is very effective and accurate for both a large number and a small number of users. In this research, differing from the distance membership determination, the statistical effect of handoff is considered. The effects of soft handoff operation on multi-cell multi-user interference are analyzed. Membership statistics which are determined by soft handoff are investigated. A simple binomial model is proposed for modelling the distribution of the number of users belonging to a base station. Considering the call arrival statistics, user membership statistics and a finite number of channels available at a base station, we evaluate the call blocking/dropping rate. The minimum number of channels required at a base-station, which ensures a specified quality of service at a given capacity requirement, is determined. System capacity is further evaluated considering both outage probability limited by interference and call blocking/dropping rate limited by finite number of channels. A pilot assisted channel allocation method is proposed to minimize the number of channels required at a base station. Based on the analysis of a CDMA cellular system with a single traffic type, the design issues in developing a multi-media wireless networks are further discussed. The capacity of a CDMA cellular system with high quality requirements and mixed stream and packet types of traffic is assessed. The impact of the choice of a line rate (bit transmission rate through channel) on the system capacity is investigated. It is also shown that the power allocated to different types of traffic can be optimized to achieve maximum capacity. The optimum power allocation suggests that the power assignments to different traffic types are mainly determined by their quality requirements.
Graduate

Zhao Fei.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2003.
Includes bibliographical references (leaves 87-89).
Abstracts in English and Chinese.
Chapter 1. --- Introduction --- p.1
Chapter 1.1 --- Multirate Scheme --- p.2
Chapter 1.1.1 --- VSF Scheme --- p.3
Chapter 1.1.2 --- Multicode Scheme --- p.5
Chapter 1.2 --- Multicode CDMA System --- p.7
Chapter 1.2.1 --- System Model --- p.7
Chapter 1.2.2 --- Envelope Variation of Multicode Signal --- p.9
Chapter 1.2.3 --- Drawback of Multicode Scheme --- p.11
Chapter 1.3 --- Organization of the Thesis --- p.13
Chapter 2. --- Related Work on Minimization of PAP of Multicode CDMA --- p.15
Chapter 2.1 --- Constant Amplitude Coding --- p.16
Chapter 2.2 --- Multidimensional Multicode Scheme --- p.22
Chapter 2.3 --- Precoding for Multicode Scheme --- p.25
Chapter 2.4 --- Summary --- p.26
Chapter 3. --- Multicode CDMA System with Constant Amplitude Transmission --- p.27
Chapter 3.1 --- System Model --- p.28
Chapter 3.2 --- Selection of Hadamard Code Sequences --- p.31
Chapter 3.3 --- The Optimal Receiver for the Multicode System --- p.37
Chapter 3.3.1 --- The Maximum-Likelihood Sequence Detector --- p.38
Chapter 3.3.2 --- Maximum A Posteriori Probability Detector --- p.41
Chapter 4. --- Multicode CDMA System Combined with Error-Correcting Codes --- p.45
Chapter 4.1 --- Hamming Codes --- p.46
Chapter 4.2 --- Gallager's Codes --- p.48
Chapter 4.2.1 --- Encoding of Gallager's Codes --- p.48
Chapter 4.2.2 --- Multicode Scheme combined with Gallager's Code --- p.52
Chapter 4.2.3 --- Iterative Decoding of the Multicode Scheme --- p.55
Chapter 4.3 --- Zigzag Codes --- p.59
Chapter 4.4 --- Simulation Results and Discussion --- p.62
Chapter 5. --- Multicode CDMA System with Bounded PAP Transmission --- p.68
Chapter 5.1 --- Quantized Multicode Scheme --- p.69
Chapter 5.1.1 --- System Model --- p.69
Chapter 5.1.2 --- Interference of Code Channels --- p.71
Chapter 5.2 --- Parallel Multicode Scheme --- p.74
Chapter 5.2.1 --- System Model --- p.74
Chapter 5.2.2 --- Selection of Hadamard Code Sequences --- p.75
Chapter 6. --- Conclusions and Future Work --- p.82
Chapter 6.1 --- Conclusions --- p.82
Chapter 6.2 --- Future Work --- p.84
Bibliography --- p.87

by Ho Ka Pui.
Thesis (M.Phil.)--Chinese University of Hong Kong, 1997.
Includes bibliographical references (leaves 78-82).
Abstract --- p.iii
Acknowledgments --- p.v
Introduction --- p.1
Chapter One --- From Monopoly Telephony to the Rise of Cellular Communication --- p.17
Chapter Two --- Oligopoly of the Cellular Communication Market in the Digital Era --- p.36
Chapter Three --- The Irony of a Free Market Place --- p.53
Chapter Four --- Cellular Communication Market and1997 --- p.67
Conclusion --- p.72
Bibliography --- p.78

Quadrature amplitude modulation (QAM) is a highly bandwidth efficient transmission technique for digital communications. It makes use of multiple signal phase and amplitude levels to carry multiple bits per symbol. This requires accurate and robust carrier phase and frequency estimation in the receiver.
Thesis (PhDElectronicEngineering)--University of South Australia, 2002

by Lam Wai-Tat.
Two pamphlets inserted.
Thesis (M.B.A.)--Chinese University of Hong Kong, 1997.
Includes bibliographical references (leaves 123-127).
APPROVAL --- p.i
ABSTRACT --- p.ii
TABLE OF CONTENTS --- p.iii
LIST OF FIGURES --- p.vi
CHAPTER
Chapter I. --- INTRODUCTION --- p.1
Chapter II. --- COMPANY BACKGROUND AND OBJECTIVES --- p.2
Nortel and Nortel China --- p.2
Corporate Goal --- p.5
Goal of Nortel China --- p.5
Product Group Goal (Wireless) --- p.6
Chapter III. --- RESEARCH OBJECTIVES AND DESIGN --- p.7
Research Objectives --- p.7
Research Design --- p.7
Market Survey --- p.8
Survey Design --- p.9
Survey Results --- p.9
Chapter IV. --- PRODUCT AND MARKET BACKGROUND --- p.12
Wireless Communication Standards --- p.12
Wireless Phone Types --- p.13
Wireless Telecommunication Network Markets --- p.13
Wireless Communications Equipment Market --- p.14
Cellular Handsets --- p.15
Chapter V. --- MARKETING ENVIRONMENT AND TRENDS - MACRO --- p.17
General China Economy --- p.17
Telecommunication Services and Regulation --- p.18
Ministry of Posts and Telecommunications (MPT) --- p.18
Directorate General of Telecommunications (DGT) --- p.19
Provincial Post and Telecommunication Administration (PTAs) and Local Telecom Bureaus --- p.19
State Radio Regulatory Commission --- p.19
Type Approval Procedure --- p.20
Imported Pagers and Mobile Phones --- p.20
Pagers and Mobile Phones Assembled or Manufactured in Mainland China --- p.21
Cellular Operators --- p.21
MPT --- p.22
Unicom --- p.23
CESEC --- p.24
Tariff Structure - Mobile Services --- p.24
Liberalization of Telecom Services --- p.25
China Unicom --- p.25
Liberalization of the Retail Market --- p.26
China Consumer Market Size --- p.26
China's Growing Urbanization --- p.28
Cultural Forces --- p.30
Technological Direction --- p.31
Chapter VI. --- MARKETING ENVIRONMENT AND TRENDS - MICRO --- p.34
Direct and Substitute Competition --- p.34
Mobile Satellite Services --- p.34
Nortel China Resources --- p.34
Supplier Influence --- p.35
End Customers --- p.35
Consumer Profiles --- p.36
Consumption Trends --- p.38
Consumer Buying Decision Process --- p.38
Cellular Handset Market Share --- p.40
Competitors --- p.41
Ericsson --- p.41
Motorola --- p.42
Nokia --- p.43
Cellular Handsets in China (Competitive Products in the Market) --- p.44
Nortel Wireless Handset Product Portfolio --- p.44
Chapter VII. --- SWOT ANALYSIS OF NORTEL --- p.46
Chapter VIII. --- STRATEGIES --- p.48
Marketing Objectives and Strategies --- p.48
Market Potential --- p.49
Nortel's Position --- p.49
Target Customer --- p.50
Target Markets by Geographic Location --- p.52
Beijing --- p.52
Cellular network --- p.53
Strategic relationship --- p.54
Shanghai --- p.54
Cellular network --- p.54
Strategic relationship --- p.55
Guangzhou --- p.55
Cellular network --- p.56
Strategic relationship --- p.56
Target Markets by Demographics --- p.56
Competitive/Differential Advantages --- p.58
Chapter IX. --- MARKETING PROGRAM --- p.61
Product --- p.61
Core Product --- p.62
Tangible Product --- p.62
Augmented Product --- p.63
Product Evolution --- p.64
Distribution --- p.66
Identification of Channel Members --- p.66
Phase I --- p.67
Primary distribution --- p.67
Secondary distribution --- p.68
Phase II --- p.68
Physical Distribution --- p.69
Promotion --- p.71
Summary of Nortel's Current Promotional Activities --- p.73
Advertising --- p.73
TV commercial #1 (corporate) --- p.73
TV commercial #2 (product) --- p.74
Newspaper advertisements --- p.75
"Magazine advertisements and ""advertorials""" --- p.75
Outdoor advertising --- p.75
Personal Selling --- p.76
Sales Promotions --- p.77
Point-of-purchase materials --- p.77
Trade shows and exhibitions --- p.77
Consumer promotions (replacement promotions) --- p.78
Trade promotions (trade rebates) --- p.78
Sales forces promotion --- p.78
Product demonstrations --- p.79
Sponsorship --- p.79
Publicity --- p.80
Budget --- p.80
Pricing --- p.82
Mobile Handset Prices and Service Charges in China --- p.82
Estimated Costs of Other Vendors' Handsets --- p.82
Pricing Considerations --- p.83
Revenue Analysis --- p.84
Chapter X. --- LIMITATIONS --- p.87
Chapter XI. --- CONCLUSION --- p.89
ABBREVIATIONS AND ACRONYMS --- p.90
APPENDIX 1 --- p.91
APPENDIX 2 --- p.96
APPENDIX 3 --- p.100
APPENDIX 4 --- p.102
APPENDIX 5 --- p.104
APPENDIX 6 --- p.105
APPENDIX 7 --- p.107
APPENDIX 8 --- p.109
APPENDIX 9 --- p.111
APPENDIX 10 --- p.113
APPENDIX 11 --- p.115
APPENDIX 12 --- p.116
APPENDIX 13 --- p.118
APPENDIX 14 --- p.119
APPENDIX 15 --- p.122
BIBLIOGRAPHY --- p.123

Kwok Pui-ho.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2000.
Includes bibliographical references (leaves [79]-85).
Abstracts in English and Chinese.
Chapter CHAPTER 1 --- INTRODUCTION --- p.1
Chapter CHAPTER 2 --- NONLINEAR BEHAVIOR OF RF POWER AMPLIFIERS --- p.5
Chapter 2.1 --- Single Tone Excitation --- p.6
Chapter 2.1.1 --- AM-AM Conversion --- p.7
Chapter 2.1.2 --- AM-PM Conversion --- p.9
Chapter 2.2 --- Two-Tone Excitation --- p.11
Chapter 2.2.1 --- Intermodulation Distortion --- p.12
Chapter 2.3 --- Digitally Modulated Signal Excitation --- p.13
Chapter 2.3.1 --- Spectral Regeneration --- p.14
Chapter 2.3.2 --- Adjacent Channel Power Ratio (ACPR) --- p.16
Chapter CHAPTER 3 --- LINEARIZATION TECHNIQUES --- p.18
Chapter 3.1 --- pre-distortion --- p.20
Chapter 3.2 --- Feed-forward Techniques --- p.23
Chapter 3.3 --- Harmonics Control Techniques --- p.24
Chapter CHAPTER 4 --- SPECTRAL REGROWTH ANALYSIS USING VOLTERRA SERIES METHOD --- p.26
Chapter 4.1 --- Introduction To Volterra Series Analysis --- p.27
Chapter 4.1.1 --- Linear and Nonlinear Systems --- p.27
Chapter 4.1.2 --- Evaluation of Volterra transfer function --- p.29
Chapter 4.1.3 --- Volterra Series Analysis of Spectral Regrowth --- p.31
Chapter 4.2 --- Nonlinear Model of GaAs MESFET Device --- p.33
Chapter 4.3 --- Evaluation Of Nonlinear Responses --- p.35
Chapter 4.3.1 --- First-Order Response --- p.36
Chapter 4.3.2 --- Second-Order Response --- p.38
Chapter 4.3.3 --- Third-Order Response --- p.39
Chapter CHAPTER 5 --- EFFECT OF HARMONIC TUNING ON SPECTRAL REGROWTH --- p.42
Chapter 5.1 --- Simulation of Digitally Modulated Signal --- p.43
Chapter 5.2 --- Effect of Source Second Harmonic Termination --- p.44
Chapter CHAPTER 6 --- EXPERIMENTAL VERIFICATION --- p.48
Chapter 6.1 --- Circuit Design and Construction --- p.49
Chapter 6.2 --- Setup and Measurement --- p.55
Chapter 6.3 --- Experimental Results --- p.56
Chapter 6.3.1 --- Small Signal Measurement --- p.56
Chapter 6.3.2 --- Single Tone Characterization --- p.57
Chapter 6.3.3 --- Two-Tone Characterization --- p.59
Chapter 6.3.4 --- ACPR Characterization --- p.60
Chapter 6.4 --- Comparison of Measurement and Simulation --- p.66
Chapter CHAPTER 7 --- NONLINEAR TRANSCONDUCTANCE COEFFICIENTS EXTRACTION --- p.68
Chapter 7.1 --- Large Signal Model --- p.69
Chapter 7.2 --- Extraction of Nonlinear Transconductance --- p.71
Chapter 7.2.1 --- Extraction of g1 --- p.71
Chapter 7.2.2 --- Extraction of g2 and g3 --- p.72
Chapter CHAPTER 8 --- CONCLUSION --- p.76
FUTURE WORK RECOMMENDATION --- p.78
REFERENCE

Indiana University-Purdue University Indianapolis (IUPUI)
Mobile IP though allows mobility features to a node it suffers from signaling Latencies which are mainly incurred due to the fact that the MN itself is involved in the handover process. To overcome this problem proxy mobile IPv6(PMIPv6) was defined where the mobility signaling is taken care of by a proxy server while keeping track of the MN's movement. PMIPv6 has considerably reduced the handover latency but the demand for real time applications over the network has increased tremendously due to recent explosion of the cloud era. My thesis focuses on increasing the L3 handoff signaling efficiency by reducing the latency. This is achieved by our idea to do both the AAA authentication as well as the LMA registration in PMIPv6 at the same time. The simulation results show that our proposed approach perform better than the current PMIPv6 L3 handover signaling reducing the latency as well as packet loss.

Rural communities have been disconnected from the global world in the past due to lack of infrastructure that rendered connectivity a challenge for them. Recent developments in information and communication technology (ICT) have led to improved connectivity in these areas. As a result, mobile phones have become ubiquitous in these rural communities. A matrix was proposed in this study in order to evaluate and assess the impact of mobile devices on development of the rural communities. Existing measurement tools have not yet explored how the usages of mobile phones and other ICTs are impacting the lives of people in rural communities of South Africa. The aim of this study was to understand the existing criteria used to measure the impact of ICTs in rural communities. This was be achieved by focusing on the use of mobile phones in the community of Phake Rebone, taking into account different users. Once this was established, the study had a primary objective to design a matrix that would assist in evaluating and assessing the impact of a mobile phone in social activities such as learning, business and governance. This was achieved by using a case study method, employing qualitative and quantitative research methods. Cases within a case study were used to uncover how the core groups within the community used the mobile phone. A mixed method approach was used in data gathering and analysis to enable the researcher to identify usages and challenges related to the mobile phones. Data was collected from 401 participants and was analysed through the computer-aided tools such GoogleDocs and Microsoft Excel. The findings of the study showed a greater usage of the mobile phone. The literature findings of the use of the mobile phone for basic communication as well as growing adoption of applications such as social media and Internet were confirmed. The use in community related activities and work purposes that impacted the community members were minimal. The need of training to gain knowledge on how to use the device more effectively was established. The proposed matrix therefore seemed v relevant not only to measure impact but also to highlight the areas in which the community members can be trained on. The noted usage trends and needs by the community were then used to formulate indicators that could be used for the matrix. The indicators were then used to develop a matrix that could be used by community members and other interested parties to measure the impact of mobile phone on development of the users. The results of the matrix were also proved to be efficient in assisting individual users in recording the skills acquired through the use of the mobile phone. The matrix can be used in consultation with the guidelines that were formulated to ensure that each user, particularly from rural communities, benefits from such an evaluation tool
Development Studies
D. Litt. et Phil. (Development Studies)