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1
FIGUEIREDO, TAMARA DE BRITTO. "WIRELESS TECHNOLOGY APPLICATION IN LOGISTIC". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5387@1.
Testo completoAbstract (sommario):
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOAs atividades logísticas sofreram grandes transformações no decorrer do século XX, evoluindo de um nível meramente operacional, passando por diferentes fases de integração, alcançando por fim, uma postura estratégica. Em sua última etapa, a Logística assumiu um enfoque mais gerencial, em meio ao qual se desenvolveu o conceito de Supply Chain Management. Tal evolução se deu em meio a importantes mudanças econômicas e sociais, as quais repercutiram na transição dos Sistemas de Produção. Os efeitos da globalização aceleraram em muito esse processo. A necessidade de flexibilidade decorrente desses efeitos impulsionou por sua vez, o desenvolvimento de sofisticadas tecnologias da informação. Nas últimas décadas, em virtude da valorização de princípios de mobilidade, observou-se uma forte tendência ao emprego de tecnologias de informação sem fio, em muitas atividades logísticas. O presente trabalho visa fazer um levantamento das principais tecnologias de transmissão de informações por rádio-freqüência, por meio das quais, pode se gerenciar o fluxo bidirecional de informações e materiais, de forma a promover maior grau de integração da cadeia logística. Uma atenção especial foi atribuída a uma mais recente tecnologia de captura de dados: o RFID (RadioFrequency Identification), por meio da qual se pode realizar operações de controle e localização de uma entidade, dentro de determinada área de abrangência. O RFID vem aos poucos conquistando mercado no quadro brasileiro, no controle de mercadorias em linha de montagem, e de acesso de veículos. Com base nos resultados de um estudo empírico realizado pelo autor, abrangendo empresas fornecedoras de produtos e serviços da rede sem fio operantes no Brasil, pôde-se analisar alguns impactos da cultura RFID no SCM.
Logistics activities suffered great transformations in the twentieth century, evolving from a mere operational level, passing through different stages of integration, and finally attaining a strategic position. In its final stage, Logistics took on a managerial approach within which the concept of Supply Chain Management was developed. This evolution took place amongst important economic and social changes which affected the Production Systems transition. The effects of globalization greatly accelerated this process. The need for flexibility as a result of these effects stimulated, in turn, the development of sophisticated information technologies. In the last decades, with the valuation of mobility principles, a growing trend towards the use of wireless information technologies was observed in many logistics activities. The present work aims at surveying the main radio frequency technologies for information transmission by means of which the bidirectional flow of information and materials can be managed in order to promote a greater degree of integration in the logistics chain. Special attention was attributed to a more recent data capture technology: RFID (Radio Frequency Identification), by means of which operations of control and tracking of an entity can be performed within a certain range. RFID has conquered the Brazilian market in such activities as assembly line merchandise control and vehicle tracking. Some impacts of RFID on the SCM could be analyzed from the results of an empirical study carried out with suppliers of wireless products and services.
2
Литвиненко, Галина Іванівна, Галина Ивановна Литвиненко, Halyna Ivanivna Lytvynenko e R. S. Volkov. "Using wireless technology: sequrity measures". Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/16948.
Testo completo
3
Fuller, Robert, Ryan Nastase, Kaoru Elliott, Anas Salhab e Jonathan Campbell. "Wireless Power Transmission Using Microwave Technology". International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605913.
Testo completoAbstract (sommario):
ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, CaliforniaAs part of the Senior Capstone class held at the University of Arizona in the College of Engineering, the team was tasked to build a prototype that could power a simple electronic device wirelessly. The team succeeded in doing so and has proven that wireless power transmission could be a valuable tool for future use. There are a few difficulties to note and specifics will be given in the body of the report.
4
Zacot, Chimi I. "Shipboard wireless sensor networks utilizing Zigbee technology". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Sep%5FZacot.pdf.
Testo completoAbstract (sommario):
Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2006.Thesis Advisor(s): Xiaoping Yang. "September 2006." Includes bibliographical references (p. 59). Also available in print.
5
Dolz, Patrick. "Wireless sensor data transfer using bluetooth technology". Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/5273.
Testo completoAbstract (sommario):
Bibliography: leaves 70-72.The objective of this thesis is to design and program an application for the Linux based Axis Etrax100LX developer board using the C programming language. This application will collect sensor data (4-20mA signals as the standard analog inputs and 0-5V as the digital inputs) from the serial port of the Etrax100LX developer board, save them to a file on the developer board and make this data available for remote access. The idea behind using the Etrax100LX development board and writing software for it is to build a wireless, web-based monitoring system for electrical and mechanical rotating machineray which makes the data available for remote access. Bluetooth is a wireless, data transmission technology [13] designed specifically for use in Personal Area Networks (PANs) where up to seven Bluetooth enabled computing devices such as Personal Computers and Personal Digital Assistants (PDAs) can form either a Group ad-hoc Network (GN or Bluetooth Piconet) or a network where one of them acts as a proxy, router or bridge (Network Access Point, NAP) between and existing network inftrastructure (typically LAN) and the other Bluetooth devices [14].
6
Berglund, Marie. "Voice User Interface for Understanding Wireless Sensor Technology". Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-97127.
Testo completoAbstract (sommario):
The research area of wireless sensor network (WSN) witnessed an increased attention in the last few´years due to the great potential to allow a comprehensive monitoring of the environment. With the sensing technology of WSN large areas can be monitored allowing for a comprehensive study of the environment. Handling WSN requires prior knowledge about the technology and this becomes an issue for a first time user, unable to explore the whole potential of the networks. Incorporating WSN technology with voice recognition technology allows the creation of a platform for developing new innovative user interactions. This report presents a novel voice user interface for understanding wireless networks by integrating the voice recognition features of the Center for Spoken Language Understanding (CSLU) toolkit with wireless sensor nodes allowing a first time user to interact with a wireless sensor network through voice input.The voice user interface software allows a new user to collect data from the network through voice input enabled by conversing with an animated agent. The software is highly extensible and its envisioned future deployment will be to teach Irish secondary school students more about wireless technology.
7
Mou, Xiaolin. "Wireless power transfer technology for electric vehicle charging". Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12416/.
Testo completoAbstract (sommario):
In the years 1884-1889, after Nicola Tesla invented "Tesla Coil", wireless power transfer (WPT) technology is in front of the world. WPT technologies can be categorized into three groups: inductive based WPT, magnetic resonate coupling (MRC) based WPT and electromagnetic radiation based WPT. MRC-WPT is advantageous with respect to its high safety and long transmission distance. Thus it plays an important role in the design of wireless electric vehicle (EV) charging systems. The most significant drawback of all WPT systems is the low efficiency of the energy transferred. Most losses happen during the transfer from coil to coil. This thesis proposes a novel coil design and adaptive hardware to improve power transfer efficiency (PTE) in magnetic resonant coupling WPT and mitigate coil misalignment, a crucial roadblock to the acceptance of WPT for EV. In addition, I do some analysis of multiple segmented transmitters design for dynamic wireless EVs charging and propose an adaptive renewable (wind) energy-powered dynamic wireless charging system for EV.
8
Zinchenko, I. S. "Technology of data transfer in wireless sensor networks". Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/45887.
Testo completoAbstract (sommario):
It has been over a decade since then, when we started intensive scientific and technological research of possibilities of using sensors together with the wireless network. The result was the creation of new types of telecommunications networks, wireless sensor networks (WSN) is a new promising technology, which are applied and executed large-scale projects for different industries and military systems.
9
Riffe, Matthew Joseph. "Wireless MRI Detector Arrays: Technology & Clinical Applications". Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1377183452.
Testo completo
10
El, Helou Melhem. "Radio Access Technology Selection in Heterogeneous Wireless Networks". Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S086/document.
Testo completoAbstract (sommario):
Pour faire face à la croissance rapide du trafic mobile, différentes technologies d'accès radio (par exemple, HSPA, LTE, WiFi, et WiMAX) sont intégrées et gérées conjointement. Dans ce contexte, la sélection de TAR est une fonction clé pour améliorer les performances du réseau et l'expérience de l'utilisateur. Elle consiste à décider quelle TAR est la plus appropriée aux mobiles. Quand l'intelligence est poussée à la périphérie du réseau, les mobiles décident de manière autonome de leur meilleur TAR. Ils cherchent à maximiser égoïstement leur utilité. Toutefois, puisque les mobiles ne disposent d'aucune information sur les conditions de charge du réseau, leurs décisions peuvent conduire à une inefficacité de la performance. En outre, déléguer les décisions au réseau optimise la performance globale, mais au prix d'une augmentation de la complexité du réseau, des charges de signalisation et de traitement. Dans cette thèse, au lieu de favoriser une de ces deux approches décisionnelles, nous proposons un cadre de décision hybride: le réseau fournit des informations pour les mobiles pour mieux décider de leur TAR. Plus précisément, les utilisateurs mobiles choisissent leur TAR en fonction de leurs besoins et préférences individuelles, ainsi que des paramètres de coût monétaire et de QoS signalés par le réseau. En ajustant convenablement les informations du réseau, les décisions des utilisateurs répondent globalement aux objectifs de l'opérateur. Nous introduisons d'abord notre cadre de décision hybride. Afin de maximiser l'expérience de l'utilisateur, nous présentons une méthode de décision multicritère (MDMC) basée sur la satisfaction. Outre leurs conditions radio, les utilisateurs mobiles tiennent compte des paramètres de coût et de QoS, signalées par le réseau, pour évaluer les TAR disponibles. En comparaison avec les solutions existantes, notre algorithme répond aux besoins de l'utilisateur (par exemple, les demandes en débit, la tolérance de coût, la classe de trafic), et évite les décisions inadéquates. Une attention particulière est ensuite portée au réseau pour s'assurer qu'il diffuse des informations décisionnelles appropriées, afin de mieux exploiter ses ressources radio alors que les mobiles maximisent leur propre utilité. Nous présentons deux méthodes heuristiques pour dériver dynamiquement quoi signaler aux mobiles. Puisque les paramètres de QoS sont modulées en fonction des conditions de charge, l'exploitation des ressources radio s'est avérée efficace. Aussi, nous nous concentrons sur l'optimisation de l'information du réseau. La dérivation des paramètres de QoS est formulée comme un processus de décision semi-markovien, et les stratégies optimales sont calculées en utilisant l'algorithme de Policy Iteration. En outre, et puisque les paramètres du réseau ne peuvent pas être facilement obtenues, une approche par apprentissage par renforcement est introduite pour dériver quoi signaler aux mobilesTo cope with the rapid growth of mobile broadband traffic, various radio access technologies (e.g., HSPA, LTE, WiFi, and WiMAX) are being integrated and jointly managed. Radio Access Technology (RAT) selection, devoted to decide to what RAT mobiles should connect, is a key functionality to improve network performance and user experience. When intelligence is pushed to the network edge, mobiles make autonomous decisions regarding selection of their most appropriate RAT. They aim to selfishly maximize their utility. However, because mobiles have no information on network load conditions, their decisions may lead to performance inefficiency. Moreover, delegating decisions to the network optimizes overall performance, but at the cost of increased network complexity, signaling, and processing load. In this thesis, instead of favoring either of these decision-making approaches, we propose a hybrid decision framework: the network provides information for the mobiles to make robust RAT selections. More precisely, mobile users select their RAT depending on their individual needs and preferences, as well as on the monetary cost and QoS parameters signaled by the network. By appropriately tuning network information, user decisions are globally expected to meet operator objectives, avoiding undesirable network states. We first introduce our hybrid decision framework. Decision makings, on the network and user sides, are investigated. To maximize user experience, we present a satisfaction-based Multi-Criteria Decision-Making (MCDM) method. In addition to their radio conditions, mobile users consider the cost and QoS parameters, signaled by the network, to evaluate serving RATs. In comparison with existing MCDM solutions, our algorithm meets user needs (e.g., traffic class, throughput demand, cost tolerance), avoiding inadequate decisions. A particular attention is then addressed to the network to make sure it broadcasts suitable decisional information, so as to better exploit its radio resources while mobiles maximize their own utility. We present two heuristic methods to dynamically derive what to signal to mobiles. While QoS parameters are modulated as a function of the load conditions, radio resources are shown to be efficiently exploited. Moreover, we focus on optimizing network information. Deriving QoS parameters is formulated as a semi-Markov decision process, and optimal policies are computed using the Policy Iteration algorithm. Also, and since network parameters may not be easily obtained, a reinforcement learning approach is introduced to derive what to signal to mobiles. The performances of optimal, learning-based, and heuristic policies are analyzed. When thresholds are pertinently set, our heuristic method provides performance very close to the optimal solution. Moreover, although lower performances are observed, our learning-based algorithm has the crucial advantage of requiring no prior parameterization
11
Harrell, Andre T. "Wireless technology via satellite communications for peacekeeping operations". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://library.nps.navy.mil/uhtbin/hyperion-image/01Sep%5FHarrell.pdf.
Testo completoAbstract (sommario):
Thesis (M.S. in Information Systems Technology)--Naval Postgraduate School, September 2001.Thesis advisor(s): Tri T. Ha, Nancy Roberts. Includes bibliographical references (p. 85-87). Also available online.
12
Andújar, Linares Aurora. "Ground plane booster antenna technology for wireless handheld devices". Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/129923.
Testo completoAbstract (sommario):
This thesis is framed in the field of mobile communications and more particularly in handset antennas. The wireless industry is constantly growing, which entails challenging handset antenna specifications. Handset antennas not only have to be multi-band for satisfying the great number of communication services, but also sufficiently small as for fitting in the reduced space imposed by the handset platforms. The appearance of the MIMO (Multiple Input Multiple Output) technology, further exacerbates these challenges. In order to satisfy these requirements, this thesis proposes the use of the ground plane, inherently present in any handset platform, as the main radiator. Electrically small nonresonant elements, called along this thesis as ground plane boosters, are used to transfer energy to this ground plane. The solution removes the need of including a dedicated antenna featured by considerable
dimensions, thus releasing space to integrate other antennas, as well as, other handset components, services and functionalities.
13
Haque, Md Ansarul, e Md Delwar Hossain. "Technology Survey of Wireless Communication for In-vehicle Applications". Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-23389.
Testo completoAbstract (sommario):
Currently, wireless communication technologies are expected to be widely employed for in-vehicle communication where in-vehicle communication is built upon the interactions of different parts inside the vehicle. This communication is to enable a variety of applications for driver and passenger needs. To have improved driving assistance, development of in-vehicle applications is very much needed. At present, intelligent systems inside the vehicle are mostly dominated by the wired technologies. The possibilities of wireless communication have inspired us and made an opportunity to analyse replacements for wired communication within a vehicle. In this connection, the scope of our thesis is to define the in-vehicle applications which are preferred by the wireless technologies, to define the applications using wired technologies which could be replaced by the wireless technologies and to identify those applications which are difficult to implement by the wireless technologies. In-vehicle wired networks; and problems of these wired networks, along with several existing applications, have been discussed at the initial stage of this thesis for the purpose of having a clear understanding. After that, existing In-vehicle wireless applications and several challenging applications have also been studied. Studies have been done on the most important wireless technologies with their respective specifications. The requirement of establishing wireless communication has also been explained. Finally, an analysis has been done according to the requirements of the applications and verification of their possible reliance on the wireless technologies. In a brief, comparable studies have been done among the wireless technologies to assess their current and future fitness for In-vehicle applications. The thesis concludes with some recommendations regarding when wireless technologies might be suitable for some in-vehicle applications to replace the wired technologies.
14
Chan, Sau-chuen Jenny, e 陳秀川. "Wireless technology use in schools to support student learning". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B27741655.
Testo completo
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Wang, Shihua. "Advanced Antenna Technology for Wireless Communications in Indoor Environments". Thesis, Queen Mary, University of London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531471.
Testo completo
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Hoffman, Samuel Chase. "Automotive Suspension Parameter Estimation Using Smart Wireless Sensor Technology". DigitalCommons@CalPoly, 2008. https://digitalcommons.calpoly.edu/theses/20.
Testo completoAbstract (sommario):
This thesis project demonstrates the feasibility of using a smart sensor system to estimate vehicle parameters. It includes the development of the smart sensor system and the method for which vehicle parameters are estimated using this system. The smart sensor system is a wireless computer controlled sensor array that can be easily installed onto a vehicle. Parameter estimation was accomplished using grey box code in Matlab System Identification Toolbox, a software package from Mathworks. Front and rear suspension damping rates and pitch inertia were estimated on the 2008 Cal Poly SAE Baja Car with good accuracy during testing.
17
Imsuksri, Sumit. "Mobile order entry system based on the wireless technology". CSUSB ScholarWorks, 2002. https://scholarworks.lib.csusb.edu/etd-project/2265.
Testo completoAbstract (sommario):
The sales representatives primary duties are to attract wholesale and retail buyers and purchasing agents to their merchandise, and to address any of their client's questions or concerns. Aided by a laptop computer connected to the Internet, they can access the customer information and sell products to their customer immediately. This project, a Mobile Order Entry System using cellphones, will give sales representatives as state-of-the-art alternative in accessing anf selling products to their customers through cell phones instead of using laptop computers.
18
Fritzin, Jonas. "CMOS RF Power Amplifiers for Wireless Communications". Doctoral thesis, Linköpings universitet, Elektroniska komponenter, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-71852.
Testo completoAbstract (sommario):
The wireless market has experienced a remarkable development and growth since the introduction of the first modern mobile phone systems, with a steady increase in the number of subscribers, new application areas, and higher data rates. As mobile phones and wireless connectivity have become consumer mass markets, the prime goal of the IC manufacturers is to provide low-cost solutions. The power amplifier (PA) is a key building block in all RF transmitters. To lower the costs and allow full integration of a complete radio System-on-Chip (SoC), it is desirable to integrate the entire transceiver and the PA in a single CMOS chip. While digital circuits benefit from the technology scaling, it is becoming harder to meet the stringent requirements on linearity, output power, bandwidth, and efficiency at lower supply voltages in traditional PA architectures. This has recently triggered extensive studies to investigate the impact of different efficiency enhancement and linearization techniques, like polar modulation and outphasing, in nanometer CMOS technologies. This thesis addresses the potential of integrating linear and power-efficient PAs in nanometer CMOS technologies at GHz frequencies. In total eight amplifiers have been designed - two linear Class-A PAs, two switched Class-E PAs, and four Class-D PAs linearized in outphasing configurations. Based on the outphasing PAs, amplifier models and predistorters have been developed and evaluated for uplink (terminal) and downlink (base station) signals. The two linear Class-A PAs with LC-based and transformer-based input and interstage matching networks were designed in a 65nm CMOS technology for 2.4GHz 802.11n WLAN. For a 72.2Mbit/s 64-QAM 802.11n OFDM signal with PAPR of 9.1dB, both PAs fulfilled the toughest EVM requirement in the standard at average output power levels of +9.4dBm and +11.6dBm, respectively. The two PAs were among the first PAs implemented in a 65nm CMOS technology. The two Class-E PAs, intended for DECT and Bluetooth, were designed in 130nm CMOS and operated at low ‘digital’ supply voltages. The PAs delivered +26.4 and +22.7dBm at 1.5V and 1.0V supply voltages with PAE of 30% and 36%, respectively. The Bluetooth PA was based on thin oxide devices and the performance degradation over time for a high level of oxide stress was evaluated. The four Class-D outphasing PAs were designed in 65nm, 90nm, and 130nm CMOS technologies. The first outphasing design was based on a Class-D stage utilizing a cascode configuration, driven by an AC-coupled low-voltage driver, to allow a 5.5V supply voltage in a 65nm CMOS technology without excessive device voltage stress. Two on-chip transformers combined the outputs of four Class-D stages. At 1.95GHz the PA delivered +29.7dBm with a PAE of 26.6%. The 3dB bandwidth was 1.6GHz, representing state-of-the-art bandwidth for CMOS Class-D RF PAs. After one week of continuous operation, no performance degradation was noticed. The second design was based on the same Class-D stage, but combined eight amplifier stages by four on-chip transformers in 130nm CMOS to achieve a state-of-the-art output power of +32dBm for CMOS Class-D RF PAs. Both designs met the ACLR and modulation requirements without predistortion when amplifying uplink WCDMA and 20MHz LTE signals. The third outphasing design was based on two low-power Class-D stages in 90nm CMOS featuring a harmonic suppression technique, cancelling the third harmonic in the output spectrum which also improves drain efficiency. The proposed Class-D stage creates a voltage level of VDD/2 from a single supply voltage to shape the drain voltage, uses only digital circuits and eliminates the short-circuit current present in inverter-based Class-D stages. A single Class-D stage delivered +5.1dBm at 1.2V supply voltage with a drain efficiency and PAE of 73% and 59%, respectively. Two Class-D stages were connected to a PCB transformer to create an outphasing amplifier, which was linear enough to amplify EDGE and WCDMA signals without the need for predistortion. The fourth outphasing design was based on two Class-D stages connected to an on-chip transformer with peak power of +10dBm. It was used in the development of a behavioral model structure and model-based phase-only predistortion method suitable for outphasing amplifiers to compensate for both amplitude and phase mismatches. In measurements for EDGE and WCDMA signals, the predistorter improved the margin to the limits of the spectral mask and the ACLR by more than 12dB. Based on a similar approach, an amplifier model and predistortion method were developed and evaluated for the +32dBm Class-D PA design using a downlink WCDMA signal, where the ACLR was improved by 13.5dB. A least-squares phase predistortion method was developed and evaluated for the +30dBm Class-D PA design using WCDMA and LTE uplink signals, where the ACLR was improved by approximately 10dB.
19
Kulyasov, Sergey. "Upgrading LAN infrastructure in manufacturing company to support wireless technology". Menomonie, WI : University of Wisconsin--Stout, 2005. http://www.uwstout.edu/lib/thesis/2005/2005kulyasovs.pdf.
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Yi, Xiaokun. "Adaptive Wireless Multimedia Services". Thesis, KTH, Kommunikationssystem, CoS, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92208.
Testo completoAbstract (sommario):
Context-awareness is a hot topic in mobile computing currently. A lot of importance is being attached to facilitating the user of various mobile computing devices to provide services that are more “user-centric”. One aspect of context-awareness is to perceive variations in available resources, and to make decisions based on the feedback to enable applications to automatically adapt to the current environment. For Voice over IP (VoIP) software phones (softphones), variations in network performance lead to fluctuations in the quality of the communication. Therefore, by making these softphones more adaptive to the network environment will, to some extent, mask such fluctuations. Dynamic voice and video adaptation derives from the fact that different coder-decoders (CODEC) have different characteristics, even the same CODECs with a different configuration can behave quite differently, in terms of bandwidth consumption, packet size, etc. Minisip is a VoIP client application which was implemented on and targeted for a Linux platform. One of my tasks was to port Minisip to Microsoft’s Windows Mobile operating system, running on an HP IPAQ Pocket PC H5550. Such handheld computer enables the user to communication while they are moving about, thus increasing the probability that the characteristics of the network connection will change. Building upon this port, the next task was to add dynamic voice and video CODEC adaptation. Dynamic voice and video CODEC adaptation on Minisip poses several challenges, for example, in what way can the network performance be determined and what adaptation strategy can achieve high call quality while making efficient utilization of available network resources. In order to make the proper design choices, several estimation models will be discussed, these are used to determine an efficient, un-intrusive, and light weight means of dynamic CODEC selection within Minisip. This thesis only implemented audio CODEC adaptation of Minisip, and the evaluation of the resulting prototype shows that such dynamic adaptation is both feasible and practical; further more, video CODEC adaptation would be a more significant extension to this work in the future.Context-awareness är ett hett i den nuvarande mobila datavärlden. Det finns ett stort värde i att facilitating användare av olika mobila dator anordningar för att kunna förse branschen med användarvänligare tjänster. En aspekt på Context-awareness är att uppmärksamma variationen i de tillgängliga medel som finns tillhanda, och att ta beslut som är baserade på feedback för att applikationen automatiskt ska anpassa sig till den nuvarande miljön. Variationer i nätverksprestanda påverkar kvaliteten på Voice over IP (VoIP), som är en typ utav softwaretelefon, i hög grad. Dessa kvalitets svängningar kan stabiliseras och döljas i högre grad om softwaretelefonen anpassas till nätverksmiljön. Dynamisk voice och video adaptation härleds från faktum att olika coder-decoders (CODEC) har olika karaktärer, även samma CODEC med en annan konfiguration kan bete sig olikt sig själv om vi talar om bandbredds förbrukning och packet storlekar, etc. Minisip är en VoIP klient som är framtagen för Linux plattformen. En av mina huvuduppgifter var att port Minisip till Microsoft’s Windows Mobila operativsystem genom att köra en HP IPAQ Pocket PC H5550. En sådan bärbar dator möjliggör för användaren att kommunicera fastän denne rör på sig, fastän risken finns för att nätverks kontakten ändras. Baserat på denna port, blev min nästa uppgift att anpassa denna CODEC till dynamiskt ljud och bild. Att anpassa denna CODEC till dynamiskt ljud och bild på Minisip medför många utmaningar t.ex. hur nätverks prestandan kan bestämmas och vilken anpassningsstrategi som kan bidra till högkvalitativa samtal samtidigt som nätverks tillgångarna nyttjas på ett effektivt sätt. Denna tes kan endast genomföras på ljud CODEC anpassning av Minisip, och utvärderingen utav prototypen resulterade i att sådan dynamisk anpassning är både genomförbar och praktisk, en video CODEC anpassning skulle bli ett perfekt uppföljningsprojekt till denna studie.
21
Muhovic, Admir. "Secure Wireless Communication". Thesis, KTH, Kommunikationssystem, CoS, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92023.
Testo completoAbstract (sommario):
The need for and requests for utilization of wireless equipment are growing rapidly. Advantages of using wireless communication are easy to realize. Having access to electronically stored information no matter where you are is a big advantage. Furthermore, wireless communication is increasingly utilized in everyday work and there is a constant development of new wireless equipment. Today, utilization of wireless communication is very practical as well as effective. On the other hand, using wireless equipment and communication entails risk unless efforts are made to secure this communication. Some wireless protocols exist and are used, despite their being vulnerable to attacks. Additionally, the traffic can easily be eavesdropped. Incorrect installation of wireless equipment contributes to the vulnerabilities of wireless communication. Some of the IT-equipment available on the market today offers wireless communication. This equipment is increasingly used within FMV. Such equipment includes: laptops, PDAs, cellular phones, etc. This wireless equipment, according to FMV’s information security policy, must be approved from a security viewpoint before it can be used at FMV. Thus an analysis of risks associated with usage of wireless equipment must take place and the mechanisms necessary to ensure adequate security must be identified. The document “Requirements on Security Functions (Kraven på SäkerhetsFunktioner, KSF)” identifies the technical and/or administrative requirements for such equipment.</p> The aim of this thesis was to analyze if it is possible to utilize wireless equipment at FMV, specifically, if it can be connected to the internal LAN at FMV. In other words, the wireless equipment must be able to offer security protection corresponding to the information security class: HEMLIG/RESTRICTED. The thesis contains an analysis of which security functions are available on the market today and evaluates whether these security functions meet the requirements given in KSF. The result is a proposal for the best security mechanism(s) within the constraints of KSF and the available equipment. The thesis proposes a technical solution along with suitable security mechanisms. The advantages and drawbacks of each has been analyzed. Additionally, the thesis presents a number of (administrative) security policies in order to be able to handle security aspects which are not covered by the KSF.Behoven och efterfrågan av mobil och trådlös utrustning är i dagsläget allt större. Fördelarna med att använda sig av trådlös kommunikation är enkla att inse. Att kunna ha tillgång till elektroniskt lagrad information oavsett var man än befinner sig är en stor fördel. Vidare implementeras trådlös kommunikation allt mer i det vardagliga arbetet samtidigt som utrustning för denna sorts kommunikation är i ständig utveckling. I slutändan är användandet av trådlös kommunikation väldigt praktiskt samtidigt som det är effektivt. Användandet av trådlös utrustning och kommunikation medför ett risktagande då denna typ av kommunikation allmänt är osäker. Detta eftersom teknologin fortfarande är i utvecklingsfasen. De i dagsläget aktuella trådlösa protokollen är sårbara för attacker och det är dessutom enkelt att avlyssna trafiken. Felaktig installation av utrustning bidrar dessutom också till att den trådlösa kommunikationen blir sårbar. En del av den IT-utrustning som idag finns tillgänglig ute på marknaden och som alltmer används inom FMV har möjlighet att kommunicera trådlöst med omgivningen. Exempel på sådan utrustning är bärbara datorer, PDA:er, mobiltelefoner mm. Denna typ av utrustning, dvs. trådlös utrustning, skall enligt FMVs informationssäkerhetspolicy godkännas från säkerhetssynpunkt innan den får tas i bruk på FMV. Det innebär att man utför en analys av vilka risker som är förknippade med användandet av trådlös utrustning samt att man identifierar adekvata skyddsåtgärder. Till sin hjälp använder man sig av Kraven på SäkerhetsFunktioner (KSF) som består av tekniska och/eller administrativa krav. Syftet med detta examensarbete var att undersöka om det finns möjlighet att använda trådlös utrustning på FMV, dvs. att denna används på interna LAN på FMV. Med andra ord skall den trådlösa utrustningen kunna erbjuda ett skydd motsvarande högst informationssäkerhetsklassen HEMLIG/RESTRICTED (H/R). Examensarbetet innefattar en analys av vilka säkerhetsfunktioner idag finns tillgängliga ute på marknaden och utvärderar huruvida dessa säkerhetsfunktioner uppfyller kraven givna i Kraven på SäkerhetsFunktioner (KSF). Resultatet är ett förslag på de bästa säkerhetsmekanismerna inom restriktionerna av KSF och den tillgängliga utrustningen. Examensarbetet föreslår en teknisk lösning med lämpliga säkerhetsmekanismer. Dess för- och nackdelar har analyserats. Examensarbetet presenterar dessutom ett antal (administrativa) säkerhets policies som hanterar säkerhetsaspekter som inte omhändertas av KSF.
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Neto, Maria Isabel A. S. 1974. "Wireless networks for the developing world". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/16670.
Testo completoAbstract (sommario):
Thesis (S.M.)--Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2004.Includes bibliographical references (p. 216-226).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
As radio technologies and public policies evolve, an increasing amount of spectrum is being set aside for transmission use without a license. These license-exempt, or "unlicensed" bands, include 2.4 GHz and 5 GHz in the USA and much of Europe. I argue that this unlicensed spectrum, and low-cost wireless technologies that operate in these bands, is of particular value in the developing world, where it has the potential to substantially impact accessibility and availability of information and telecommunication services. In the context of numerous institutional and structural obstacles to entry license-exempt regulation potentially provides a friendly environment for entrepreneurship, reducing barriers to entry and the risk of regulatory capture. In order to assess this opportunity in the context of Africa, I have surveyed every country in the continent on their regulations and use of the 2.4 and 5 GHz bands. Responses, from differing country informants though mostly from the regulators themselves, were received from 47 of the 54 countries of Africa, which accounts for 95% of the continent's population. The responses show that there is significant diversity and heterogeneity in the regulation of these bands across Africa. Not only do licensing requirements and specific conditions change widely from country to country, but so do power, range and services restrictions, as well as certification requirements. In addition, regulation is still not in place in some countries, and is changing in others. Enforcement is low, adding to overall uncertainty. Lack of clarity in regulation and enforcement creates confusion and may discourage smaller players from entering the market. For bigger players interested in taking advantage of economies of scale
(cont.) and implementing common strategies across borders, the heterogeneous regulatory environment will also act as a deterrent and a barrier to entry. Despite this heterogeneity, these bands are being used in most African countries, not only for "hotspot" style or other localized coverage in urban areas, but also for longer area coverage. A significant 37% of the countries that responded are using wireless technologies operating in these bands for providing backhaul network connectivity in rural areas. In unlicensed bands regulation tends to place a burden on the transmitter though, e.g. through power restrictions, in particular where competition in the market is low. In view of the continent's weak teledensity and lack of alternative infrastructure, establishing a more certain and uniform regulatory framework and promoting an appropriate business climate across Africa may be instrumental in encouraging private investment and connectivity through technology in these bands. The TU may have a key role to play, both by issuing clearer guidelines for the regulation of license-exempt bands, and by serving as a convening forum for countries to establish common regulatory strategies. While a fair balance is needed in regulation, this thesis argues that governments should err on the side of laxity in order to lower barriers to entry and counterbalance current overregulation of these bands.
by Maria Isabel A.S. Neto.
S.M.
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Vijayaganapathi, Bavithra. "Designing a Wireless Step Counter". Thesis, Högskolan i Halmstad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-38200.
Testo completo
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Ali, Mohamed Iqram. "Wireless mesh networking for the Outdoor Sports (Orienteering)". Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-52878.
Testo completoAbstract (sommario):
Orienteering is played at different terrain lands. Competitors are allowed to carry a topograph-ical map and a magnetic compass. Map has standard signs and sequence of number signifies as the check points one who accomplish all the check points in sequence in shortest period of time is a winner and it requires good map navigational skill. Real time online analysis of orienteering sports is the one still doesn’t exist and tracking orienteering competitors is challenging thing to implement using passive RFID wireless mesh network. Tracking the competitors using wireless mesh network makes this sport attractive and interesting to global online viewers. Existing devices provides only the offline analysis. This will allow viewers to view live progress of participants’ positions. Currently existing available systems for monitoring Orienteering competitors unable to facilitate online analysis feature so this feature is easier for spectators to track the competitor’s position. In this project, I described about my implementation, designing and testing of designed wire-less mesh hardware device to NEP AB Company and this device can be used in other outdoor sports for tracking the competitors and also be used in other tracking applications like mili-tary, medical and asset tracking. Wireless device is implemented using two ISM band 915MHz and 434MHz lowest frequency is to cover the longest range. Hardware device designed, which communicate from one node to other node performs receiv-ing, transmitting and forwarding the packet. I defined the protocol standard which is com-pliance of IEEE 805.15.4 for the WPAN the communication pattern is to provide reliable and robust communication between the transmitter and receiver. Idea is to print the passive 13.56 MHz RFID tag behind the map, so competitors no need to carry anything apart from map and compass. Instead of RFID reader, in this project I have given the interrupt from the button and integrate reader part is considered as the future work. Passive RFID and wireless mesh network is the emerging field and reliable way of tracking competitors. In which data collected from the each check point with real-time data transmis-sion and all nodes information is monitored from the main control unit. This thesis describes a functional prototype of device which is used in tracking the outdoor sports competitors and the main target is to track the Orienteering competitors in the terrain land.
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Lian, Jason Hailin. "An improved media access control protocol for wireless LANs a thesis submitted to Auckland University of Technology in partial fulfilment of the requirements of the degree of Master of Information Technology, 2004". Full thesis. Abstract, 2004.
Cerca il testo completo
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Ramos, Félix Ángel. "Application of Ultra-Wideband Technology to RFID and Wireless Sensors". Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/292249.
Testo completoAbstract (sommario):
Aquesta Tesi Doctoral estudia l'ús de tecnologia de ràdio banda ultraampla (UWB) per sistemes de identificació per radiofreqüència (RFID) i sensors sense fils. Les xarxes de sensors sense fils (WSNs), ciutats i llars intel•ligents, i, en general, l'Internet de les coses (IoT) requereixen interfícies de ràdio simples i de baix consum i cost per un número molt ampli de sensors disseminats. UWB en el domini temporal es proposa aquí com una tecnologia de radio habilitant per aquestes aplicacions. Un model circuital s'estudia per RFID d'UWB codificat en el temps. Es proposen lectors basats en ràdars polsats comercials amb tècniques de processat de senyal. Tags RFID sense xip (chipless) codificats en el temps son dissenyats i caracterizats en termes de número d'identificacions possible, distància màxima de lectura, polarització, influència de materials adherits, comportament angular i corbatura del tag. Es proposen sensors chipless de temperatura i composició de ciment (mitjançant detecció de permitivitat). Dos plataformes semipassives codificades en temps (amb un enllaç paral•lel de banda estreta per despertar el sensor i estalviar energia) es proposen com solucions més complexes i robustes, amb una distància de lectura major. Es dissenya un sensor de temperatura (alimentat per energia solar) i un sensor de diòxid de nitrogen (mitjançant nanotubs de carboni i alimentat per una petita bateria), ambdòs semipassius amb circuiteria analògica. Es dissenya un multi-sensor semipassiu capaç de mesurar temperatura, humitat, pressió i acceleració, fent servir un microcontrolador de baix consum digital. Combinant els tags RFID UWB codificats en temps amb tecnologia de ràdar de penetració del terra (GPR), es deriva una aplicació per localització en interiors amb terra intel•ligent. Finalment, dos sistemes actius RFID UWB codificats en el temps s'estudien per aplicacions de localització de molt llarg abast.Esta Tesis Doctoral estudia el uso de tecnología de radio de banda ultraancha (UWB) para sistemas de identificación por radiofrecuencia (RFID) y sensores inalámbricos. Las redes de sensores inalámbricas (WSNs), ciudades y casas inteligentes, y, en general, el Internet de las cosas (IoT) requieren de interfaces de radio simples y de bajo consumo y coste para un número muy amplio de sensores diseminados. UWB en el dominio temporal se propone aquí como una tecnología de radio habilitante para dichas aplicaciones. Un modelo circuital se estudia para RFID de UWB codificado en tiempo. Configuraciones de lector, basadas en rádar pulsados comerciales, son propuestas, además de técnicas de procesado de señal. Tags RFID sin chip (chipless) codificados en tiempo son diseñados y caracterizados en términos de número de identificaciones posible, distancia máxima de lectura, polarización, influencia de materiales adheridos, comportamiento angular y curvatura del tag. Se proponen sensores chipless de temperatura y composición de cemento (mediante detección de permitividad). Dos plataformas semipasivas codificadas en tiempo (con un enlace paralelo de banda estrecha para despertar el sensor y ahorrar energía) se proponen como soluciones más complejas y robustas, con una distancia de lectura mayor. Se diseña un sensor de temperatura (alimentado por energía solar) y un sensor de dióxido de nitrógeno (mediante nanotubos de carbono y alimentado por una batería pequeña), ambos semipasivos con circuitería analógica. Se diseña un multi-sensor semipasivo capaz de medir temperatura, humedad, presión y aceleración, usando un microcontrolador digital de bajo consumo. Combinando los tags RFID UWB codificados en tiempo y tecnología de radar de penetración de suelo (GPR), se deriva una aplicación para localización en interiores con suelo inteligente. Finalmente, dos sistemas activos RFID UWB codificados en tiempo se estudian para aplicaciones de localización de muy largo alcance.
This Doctoral Thesis studies the use of ultra-wideband (UWB) radio technology for radio-frequency identification (RFID) and wireless sensors. Wireless sensor networks (WSNs) for smart cities, smart homes and, in general, Internet of Things (IoT) applications require low-power, low-cost and simple radio interfaces for an expected very large number of scattered sensors. UWB in time domain is proposed here as an enabling radio technology. A circuit model is studied for time-coded UWB RFID. Reader setups based on commercial impulse radars are proposed, in addition to signal processing techniques. Chipless time-coded RFID tags are designed and characterized in terms of number of possible IDs, maximum reading distance, polarization, influence of attached materials, angular behaviour and bending. Chipless wireless temperature sensors and chipless concrete composition sensors (enabled by permittivity sensing) are proposed. Two semi-passive time-coded RFID sensing platforms are proposed as more complex, more robust, and longer read-range solutions. A wake-up link is used to save energy when the sensor is not being read. A semi-passive wireless temperature sensor (powered by solar energy) and a wireless nitrogen dioxide sensor (enabled with carbon nanotubes and powered by a small battery) are developed, using analog circuitry. A semi-passive multi-sensor tag capable of measuring temperature, humidity, pressure and acceleration is proposed, using a digital low-power microcontroller. Combining time-coded UWB RFID tags and ground penetrating radar, a smart floor application for indoor localization is derived. Finally, as another approach, two active time-coded RFID systems are developed for very long-range applications.
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Siddiqui, Md Rezaul Karim, e Sayed Mohammad Atiqur Rahman. "Security analysis of the WiMAX technology in Wireless Mesh networks". Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3039.
Testo completoAbstract (sommario):
The IEEE 802.16 (WiMAX) is the promising technique to overcome some disadvantages on the Security concern of the widespread IEEE 802.11 standard. For providing high speed wide area broadband wireless access, WiMAX is an emerging wireless technology for creating multi-hop Mesh network. Based on the wired backbone wireless Mesh networks serve to get over present dependencies of wireless system. Wireless operates on Physical later and MAC layer in the air interface to provide fixed and Mobile Broadband Wireless Access (BWA) in broad range of frequencies. Due to the lack of Physical infrastructure of wireless networks are inherently less secure. In order to protect data exchange between the MAC layer and PHY layer WiMAX specifies a security sub-layer at the bottom of the MAC layer. The security sub-layer provides privacy with SS and BS from service hijacking. For providing authentication, data traffic privacy services and key management a PKM protocol defined by the WiMAX MAC as a sub-layer where the PKM protocol is the main protocol work in the security sub-layer. WiMAX is only a “Paper based” newly established technology based on Wi-Fi system then it is tough to find out its security holes in all the way. Keeping all the fact in mind the objectives of the thesis are to analyze the WiMAX security architecture security keys (AK, KEK and HMAC) are used for authorization, authentication and key management and TEK is for secure data transmission, possible security vulnerabilities, threats and risks are classified according to different layer with 802.16 std Mesh network. In addition, vulnerabilities comparison between IEEE 802.11 and 802.16 std has been pointed out in details, as well as security improvements and possible solutions has been proposed to protect WiMAX attacks.
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Jakonis, Darius. "Direct RF sampling receivers for wireless systems in CMOS technology /". Linköping : Univ, 2004. http://www.bibl.liu.se/liupubl/disp/disp2004/tek881s.pdf.
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Lu, Yong. "THE DIFFUSION OF WIRELESS INTERNET TECHNOLOGY AMONG UNIVERSITY FACULTY MEMBERS". Ohio University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1140660624.
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Kumari, Neha. "Feasibility Study for Substation Communication using Parallel Redundant Wireless Technology". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254361.
Testo completoAbstract (sommario):
Substations are an integral part of electric energy transmission and distribution system. With the evolution of conventional substations as digital substations, and in parallel, with the revolutionized emergence of communication systems, new communication schemes are being designed and retrofitted to incorporate the data from relays, circuit breakers and Intelligent Electronic Devices (IEDs) to integrate with the new digital substations.The thesis thus aims in evaluating a few wireless technologies to address the availability and reliability at the process level of Digital Substation System. It is achieved by introducing a redundant wireless network in parallel to existing wired solutions. For the purpose three wireless technologies IEEE 802.11g and Standalone 4G LTE network Base Station (BS) have been evaluated experimentally in a laboratory environment and 5G has been evaluated in a software simulated environment.The experimental results corresponding to IEEE 802.11g and 4G had their own limitations and faced a few challenges in meeting the process level Sampled Value data requirements. Whereas 5G showed a positive result in most of the scenarios, meeting the process bus requirement in terms of latency and packet loss.
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Hoang, Thai Bang. "Infrared and visible wireless optical technology for body sensor connectivity". Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0027/document.
Testo completoAbstract (sommario):
Cette thèse est axée sur le domaine de la communication optique sans fil en intérieur pour la surveillance de la santé basée sur des capteurs corporels. L’état de l'art des communications optique sans fil dans les domaines infrarouge, visible et UV ainsi que l'analyse des systèmes liés à la santé utilisant cette technologie ont été fournis. Cela a permis de définir les objectifs et l'orientation de cette thèse. Nous avons étudié l'utilisation de la technologie infrarouge pour la transmission de données entre un capteur porté par un patient et des récepteurs situés aux coins d'un panneau d'éclairage central au plafond de l'environnement. Un lien en visible a été utilisé pour la transmission de données du luminaire vers le patient portant un smartphone équipé d'un décodeur. Les principaux défis étaient la robustesse des liens infrarouge et visible en ce qui concerne la mobilité du patient et l'impact du corps de l'utilisateur en raison de l'emplacement du capteur. Les simulations de canaux réalisées grâce à la technique de Ray-Tracing associée à la méthode de Monte-Carlo ont permis de déterminer le gain de canal qui est le paramètre principal représentant la performance. En raison de la mobilité du patient, l'analyse a été réalisée de manière statistique et en tenant compte de différents emplacements du capteur sur le corps, de la cheville à l'épaule. Les paramètres physiques et géométriques optimaux relatifs aux émetteurs et aux récepteurs afin de garantir les meilleures performances ont été déduites. Il a été démontré qu’il est essentiel de modéliser la présence du corps pour les deux liaisons montante et descendante. Les performances globales du système ont mis en évidence le potentiel des transmissions sans fil entièrement optiques pour la surveillance médicale basée sur des capteurs corporels. Cela a été en partie confirmé par des expérimentations menées à partir de prototypes de capteur communicant en infrarouge et de produits commerciaux pour la liaison en visibleThis thesis is focused on the field of indoor optical wireless communication for health monitoring based on body sensors. The state of the art of optical wireless in the infrared, visible and UV domains as well as the analysis of health related systems using this technology have been provided. This helped to define the objectives and orientations of this thesis. We have studied the use of infrared technology for data transmission between a sensor worn by a patient and receivers located at the corners of a central lighting panel at the ceiling of the environment. A link in visible was used for the transmission of data from the luminaire to the patient carrying a smartphone equipped with a decoder. The main challenges were the robustness of the infrared and visible links with regard to patient mobility and the impact of the user's body due to the location of the sensor. The channel simulations performed using the Ray-Tracing technique associated with the Monte-Carlo method allowed determining the channel gain, which is the main parameter representing the performance. Due to the patient mobility, the analysis was performed statistically and taking into account different locations of the sensor on the body, from the ankle to the shoulder. The optimal physical and geometrical parameters for transmitters and receivers to ensure the best performance have been deduced. It has been shown that it is essential to model the presence of the body for both uplink and downlink. The overall performance of the system has highlighted the potential of fully optical wireless transmissions for medical surveillance based on body sensors. This has been partly confirmed by experiments carried out from infrared communicating sensor prototypes and commercial products for the visible link
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Hatloy, Andres Svadberg 1964. "Strategies and scenarios for wireless information systems". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9276.
Testo completoAbstract (sommario):
Thesis (S.M.M.O.T.)--Massachusetts Institute of Technology, Sloan School of Management, Management of Technology Program, 2000.Includes bibliographical references (leaves 73-74).
This thesis investigates the emerging market for wireless information services caused by the convergence of Internet, information and telecommunication technologies. Portals and content and application providers are now entering a market previously controlled and dominated by the wireless network providers. This thesis starts with a description of this new value chain and a discussion of the power of each of the participants. This is followed by an overview of the market size and the projections for the future, together with a description of services currently available around the world and associated business models. A case study on wireless financial services follows next, to illustrate what might happen and be available in other industries in the near future. I developed three scenarios for the wireless Internet services the next three years: ** A closed case: The Wireless Network As A Toll Road ** Status quo: Internet and Commerce Without Wires, Why The Hype? ** An open case: New Unique and Value-added Offerings Create New Markets I used interviews with leading industry expert to validate these scenarios. There was a general consensus among the experts and managers that my most optimistic and pessimistic scenarios represent the likely range of possible future outcomes. The majority believes we will move from the current closed (i.e. the pessimistic) case to the open model (i.e. the optimistic scenario) ending up somewhere close to the open case. The experts believed that the open model would eventually "win" due to technical improvements and competitive pressure. Based on this, I arrived at ten strategies for successful market penetration of wireless information services. The top three are; act quickly to gain first-mover advantages, enter into profit sharing because this is a complex and networked marketplace, and thirdly address unspoken and subtle needs. The main challenges facing the players in this market are: ** They have to share the ownership and responsibility of the customer experience ** The need for developing open standards together to fuel the growth of the market ** That the timing of the products and services must be right the first time.
by Andres Svadberg Hatloy.
S.M.M.O.T.
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Kuo, Chia-Ling. "Wireless Technology in Higher Education: The Perceptions of Faculty and Students Concerning the use of Wireless Laptops". Ohio University / OhioLINK, 2005. http://www.ohiolink.edu/etd/view.cgi?ohiou1125521504.
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García, Hijes Raúl. "Corporate Wireless IP Telephony". Thesis, KTH, Mikroelektronik och Informationsteknik, IMIT, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92268.
Testo completoAbstract (sommario):
IP telephony is defined as the transport of telephony calls over an IP network. IP telephony exploits the integration of voice and data networks. However, enterprises are still reluctant to deploy IP telephony despite the potential increase in productivity and reduction of costs. The principal concerns are: can IP telephony provide the same level of performance in terms of security, reliability, and scalability as traditional telephony? If so, are its proclaimed benefits such as flexibility and mobility cost-effective? The aim of this thesis is to analyze how to deploy IP telephony in large corporations - while providing the necessary security and facilitating mobility. Through the different parts of this thesis, we will analyze the applicable technologies, along with their integration and management. We will focus on the essential requirements for an enterprise of scalability, reliability, flexibility, high-availability, and cost-effectiveness. The massive changes brought about due to the deregulation of telecommunications in nearly all countries, the increasingly global nature of business, and the progressively affordable and power technology underlying information and communication technologies have lead to increasing adoption of IP telephony by residential and commercial users. This thesis will examine these technologies in the context of a very large distributed corporation.IP telefoni är definierat som transporten av telefon samtal genom ett IP nätverk. IP telefoni utnyttjar integrationen av tal och data nätverk. Dock är affärsföretag fortfarande motsträviga till att införa IP telefoni trots potentiell ökning i produktivitet och minskade kostnader. Huvud bekymren är: kan IP telefoni tillhandahålla samma nivå av prestanda med avseende på säkerhet, tillförlitlighet, och skalbarhet som traditionell telefoni? Och i så fall, är dom proklamerade fördelarna flexibilitet och rörlighet kostnadseffektiva? Målet för detta examensarbete är att analysera hur IP telefoni kan införas i stora affärsföretag - medan samtidigt tillhandahålla nödvändig säkerhet och främja rörlighet. Genom olika delar av detta examensarbete, analyserar vi tillämpliga teknologier, inklusive deras integrering och skötsel. Vi kommer att fokusera på de grundläggande kraven för ett affärsföretag gällande skalbarhet, tillförlitlighet, flexibilitet, hög tillgänglighet, och kostnadseffektivitet. Dom massiva förändringarna frambringade i och med avregleringen av telekommunikation i stort sett alla länder, affärsverksamhetens alltmer globala natur, och de progressivt kostnadseffektiva och kraftfulla underliggande teknologier bakom informations och kommunikations system har lett till ökande adoptering av IP telefoni av både privata och kommersiella användare. Detta examensarbete undersöker relevanta teknologier i samband med mycket stora utbredda affärsföretag.
Exchange student from Centro Politecnico Superior (University of Zaragoza, Spain).
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Marchenko, V. U. "Bodycom: a new wireless tech". Thesis, Сумський державний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/33729.
Testo completoAbstract (sommario):
The idea to get rid of the familiar interface of USB cables looks quite logical and quite tempting due to the general trends in the industrial transformation of conventional wired interfaces. BodyCom technology appears to be one of such innovations.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33729
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Chapin, John, e Alok Shah. "SOFTWARE RADIO TECHNOLOGY AND CHALLENGES". International Foundation for Telemetering, 2002. http://hdl.handle.net/10150/607499.
Testo completoAbstract (sommario):
International Telemetering Conference Proceedings / October 21, 2002 / Town & Country Hotel and Conference Center, San Diego, CaliforniaThis paper provides an overview of software radio and its current state in the industry. Software radio is a technology in which all of the waveform processing, including the physical layer, of a wireless device moves into software. If designed properly, this approach leads to dramatically improved device flexibility, software portability, and reduced development costs. Of course, such a technology brings with it numerous challenges, from hardware components to power constraints to the regulatory environment.
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Banerjee, Sharbari. "Performance improvement techniques for wireless underwater acoustic link in a multipath impulsive noise channel". Thesis, IIT Delhi, 2016. http://localhost:8080/iit/handle/2074/6970.
Testo completo
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Eriksson, Kristoffer. "Dynamic Resource Allocation in Wireless Networks". Thesis, Linköping University, Communication Systems, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-56776.
Testo completoAbstract (sommario):
In this thesis we investigate different algorithms for dynamic resource allocation in wireless networks. We introduce a general framework for modeling systems whichis applicable to many scenarios. We also analyze a specific scenario with adaptivebeamforming and show how it fits into the proposed framework. We then studytwo different resource allocation problems: Quality-of-Service (QoS) constraineduser scheduling and sum-rate maximization. For user scheduling, we select some“good” set of users that is allowed to use a specific resource. We investigatedifferent algorithms with varying complexities. For the sum-rate maximizationwe find the global optimum through an algorithm that takes advantage of thestructure of the problem by reformulating it as a D.C. program, i.e., a minimizationover a difference of convex functions. We validate this approach by showing that itis more efficient than an exhaustive search at exploring the space of solutions. Thealgorithm provides a good benchmark for more suboptimal algorithms to comparewith. The framework in which we construct the algorithm, apart from being verygeneral, is also very flexible and can be used to implement other low complexitybut suboptimal algorithms.
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Munsinger, David B. (David Blake) 1960. "The evolution of the wireless equipment value chain". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8470.
Testo completoAbstract (sommario):
Thesis (S.M.M.O.T.)--Massachusetts Institute of Technology, Sloan School of Management, Management of Technology Program, 2002.Includes bibliographical references (leaves 121-124).
Mobile wireless telephone systems require enormous investments in land-based radio, transmission, and switching systems in order to provide the coverage and capacity to efficiently operate a regional or nationwide cellular phone network. This wireless equipment is manufactured by an oligopoly of Original Equipment Manufacturers (OEM). These "wireless OEMs," in turn, depend upon a growing number of "upstream" component and subsystem suppliers and "downstream" wireless operators. Together these firms compose the "Wireless Equipment Value Chain." As in many industries where technology is changing rapidly, wireless telephony has seen waves of change in industry structure. This thesis surveys the forces currently driving change in the industry, outlines scenarios that describe potential directions for reorganization of the industry structure, and lists a set of warning signs that may provide clues to future trends within the industry. In addition, the thesis provides a model for the structure of the industry, which is used to construct the scenarios. Finally, it compares the strategies of two large OEMs using the models and scenarios.
by David B. Munsinger.
S.M.M.O.T.
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Abd-Alhameed, Raed A., Jonathan Rodriguez, B. A. L. Gwandu, Peter S. Excell, Mohammad J. Ngala e Abubakar S. Hussaini. "Green Wireless Internet Technology". 2014. http://hdl.handle.net/10454/8534.
Testo completoAbstract (sommario):
YesIET Editorial: In the future communications will be pervasive in nature, allowing users access at the “touch of button” to attain any service, at any time, on any device. The future device design process requires both a reconfigurable RF front end and back end with high tuning speed, energy efficiency, excellent linearity and intelligence to maximise the “greenness” of the network. But energy efficiency and excellent linearity are the main topics that are driving the designs of future transceivers, including their efforts to minimise network contributions to climate changes such as the effect of CO2 emissions: the minimisation of these is a requirement for information and communication technology (ICT) as much as for other technologies. Recently, information and communication technologies were shown to account for 3% of global power consumption and 2% of global CO2 emissions, and hence far from insignificant. The approach towards energy conservation and CO2 reduction in future communications will require a gret deal of effort which should be targeted both at the design of energy efficient, low-complexity physical, MAC and network layers, while maintaining the required Quality of Service (QoS). There is also a need, in infrastructures, networks and user terminals, to take a more holistic approach to improving or achieving green communications, from radio operation, through functionality, up to implementation. The increasing demand for data and voice services is not the only cause for concern since energy management and conservation are now at the forefront of the political agenda. The vision of Europe 2020 is to become a smart, sustainable and inclusive economy, and as part of these priorities the EU have set forth the 20:20:20 targets, whereby greenhouse gas emissions and energy consumption should be reduced by 20% while energy from renewables should be increased by 20%.
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Beuria, Manoj Kumar, e Ajay Kumar Tandi. "CDMA Technology". Thesis, 2009. http://ethesis.nitrkl.ac.in/1331/1/Copy_of_10509004.pdf.
Testo completoAbstract (sommario):
This paper gives idea about CDMA Technology and its overloading schemes.With the help of matlab codes we simulated and obtained the plot between BER and SNR and also we have shown the effect of increasing the no. of users on the plot.
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Kuo-Shin, Cheng, e 鄭國馨. "Using Wireless Technology for Digital Guidance". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/72832221999721543155.
Testo completoAbstract (sommario):
碩士國立交通大學
管理學院碩士在職專班資訊管理組
93
Wireless broadband network application has become our nation-wide trend in the area of communication industry. Through the integration of front, middle, and back-end communication enterprises, together with full collaboration between the equipment suppliers, network operators, the system and content providers. We have established a new business operation model, thanks to the wireless network technology and new application service style, and have created value-added products, driving the prosperous developments of wireless industry. Utilizing the wireless broadband technology (such as WLAN, GPRS, 3G) performed on various front-end host equipment (such as Notebook, Tablet PC, PDA, Cellular and wireless IP camera), we have converged both the communication and the network related equipment to provide M-service, M- life, M- commerce at any time, any place and any equipment instantly and conveniently. The subject of creative wireless technology application and content development in this thesis covers cases and analyses of both domestic and international practical system models, such as: car paging, car monitoring, parking service, car towing, traffic information, commercial product service, sales promotion, transaction, administration, processing information, emergency case reporting service, home medical care service, community, conference, image monitoring service technology, etc. This technology not only integrates the application process with new business operation model but also improves the performance of productivity and value of manufacturing industry.
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CHEN, YINGLIN, e 陳英林. "60GHz Wireless Technology in Camera Module". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/j922k7.
Testo completoAbstract (sommario):
碩士國立臺北科技大學
機械工程系機電整合碩士班
106
This dissertation is constructed based on smart phones’ 1300MP Auto Focused camera module not using traditional connector but via Keyssa104， TI DS90UB953 (Tx，Transmit) and DS90UB954 (Rx，Receiver) to conduct image data transmission. Certainly our objective is to utilize short-distanced wireless transmission technology to send gigantic image data to the cloud. We hope to construct a platform in which from the beginning of specification formation，key components to the later phase of manufacturing or even ISP can all be integrated. We all know a concept that if you are an iPhone user，nearly all chargeable cords，headsets and charging devices can be used. Its integration of software is compatible of hardware，for example，with only an iTune or iCloud account，Apple would allow users to upload important pictures or contact information to its cloud. In addition，this feature protects user privacy to prevent being misused. Named Kiss Touch is also based on the concept mentioned above. It’d be beneficial for most people，who heavily rely on 3C products in daily lives，if key components can be integrated covering specification formation and product tests. In other words，when I buy a Kiss Touch Connection-certified mobile phone with 1300MP camera，and several months after usage I could just buy a Kiss Touch Connection-certified 2000MP camera module to replace the original module for image quality upgrade. By doing so，I do not need to spend the replacement cost of the whole phone，nor need to dismantle the phone in order to retrieve the user information in order to obtain relevant information to do the clouding. Although there are many changes/improvements in 3C products annually to gain consumer interests，the obsolete products cause damages to the environment. With this integration concept we could eliminate the waste and the inconveniences caused by diverse products’ specification. This is the main reason why I would like to address this topic in the dissertation.
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Rath, Ranjan Kumar. "Adaptive MIMO technology for 4G". Thesis, 2012. http://ethesis.nitrkl.ac.in/3617/1/Adaptive_MIMO_technology_for_4G.pdf.
Testo completoAbstract (sommario):
The communication industry is one of the fastest growing industries. The cellular systems started in the 80’s with 1G have now reached to 4G. The growing demand of high data rates are increasing exponentially with time. The typical goals of a communication engineer are high speed communication for which the data rate should be high, better quality of signal for which we have to minimize the bit error rate as low as possible, less power consumption and VLSI implement ability. The 4G system ensures us data rate of 1Gbps which cannot be achieved by SISO systems and hence we go for MIMO system. The various benefits of MIMO are discussed in this report. The implementation of Alamouti scheme is also discussed and then the various methods of channel estimation are discussed and simulated.
The proposed MIMO system has distinguished advantages over the conventional SISO systems and this is being implemented in 4G cellular, MIMO radar and in various other emerging communication technologies.
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Hong, Wen-Chi, e 洪文吉. "Using Wireless Communication Technology for Nursing Care". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/4qwvya.
Testo completoAbstract (sommario):
碩士國立彰化師範大學
資訊管理學系所
102
Hospital nurses are the first-line personnel who provide the essential nursing care to the patients. However, nurses usually need to spend plenty of time to deal with paper work and duplicated forms, which may affect the quality of nursing care to patients. The Hospital Information System (HIS) is important to hospitals since it may reduce the management costs and improve patient’s quality of medical care as well as management efficacy and efficiency. In this study, we design and implement a VT measurement system that aims to reduce the processing time of computer paper work and duplicated form. The time save through the establishment of this system may be used to spend on the direct patient care. The system is installed in different nursing stations, and statistical data is acquired based on actual operations. Technology acceptance model, is also adopted , to verify the usefulness, ease of use and user attitude toward this system. The results of this study found that the establishment of the system does reduce the nurses’ operation time of the computer, and the nurses are also positive regarding this system’s usefulness and ease of use.
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Yang, Shun Jen, e 楊舜任. "Body Sensor Network System by Wireless Technology". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/19093499928220891318.
Testo completoAbstract (sommario):
碩士長庚大學
電機工程學研究所
96
This paper focuses on the development of a wireless physiological information network system for monitoring physiological conditions of patients or subjects during exercise. This system can be used in gymnasium , hospital ,or home .Through hand-carry PDA and monitoring devices, the exercise state and physiological state can be immediately recorded, stored, and transmitted to a doctor. Our system is ubiquitous ,long-time worn, and low power consumption, due to using low-power processor(TI MSP430) and RF chip (Nordic nRF24L01). Use Bluetooth interfacing, the recorded data can be transmitted to a Notebook PC or commercial PDA.
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Cheng, Po-Yuan, e 鄭博元. "Contactless Wireless Power Transmission Technology and Application". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/87007896738536443735.
Testo completoAbstract (sommario):
碩士淡江大學
電機工程學系碩士在職專班
101
This essay keeps with TI(Texas Instruments) high efficient hardware module and Free-Scale RX device which are following WPC(Wireless Power Consortium) concept standard. The high efficient module is through magnetic attraction transceiver and receiver by using prime and secondary electromagnetic induction coupling to simulate wireless power supply technology as experimental group and use Free-Scale’s receiver device as control group. There are three contributions in this study. The first is related to stimulation and function test of wireless power transmission technology which includes transceiver and receiver detect and distinguish communication, metal object detection, under-shoot and over-shoot protection, efficiency between each other. WPC (Wireless Power Consortium) specification allows wireless power transmission device can compatible used. Therefore, for second contribution, it takes Free-Scale receiver device which is also under WPC standard as control group to compare wireless power transmission quality, under-shoot and over-shoot protection, metal object detection, protection and efficiency each difference. The third contribution will use WPC(Wireless Power Consortium) and Qi certification as integration and introduction to explore development, future target and direction of wireless power transmission technology. According to the test result, it only takes 2 seconds to distinguish authentication between transceiver and receiver then can start process wireless power transmission. At the wireless power transmission quality, it found that when transceiver and receiver which are developed by TI processed test, receiver can acquire more completed power transfer from transceiver. Moreover, using Free-Scale receiver apparently showed that power transfer decrease effected performance efficient. Through simulated handy device test to loading and load off(under-shoot and over-shoot), and it showed that although two receiver groups output voltage even loading and load off suddenly and both are over normal working range (4.85V~5V), but still can back to stable in short time(around 200us~240ms) and maintain wireless power transmission abnormally. At metal object invade experiment aspect, if it can exclusive metal object in limited period will also restore wireless power supply. Otherwise, it will terminate wireless power transmission when metal object continually invade in limited period. Among TI’s receiver_BQ51013A module limited time is 22 seconds compared to receiver of Free-Scale’s 10 seconds. At power input protection test aspect, transceiver should stop power transmission immediately once it detects traditional adapter input. Otherwise, it will restore wireless power transmission when adapter removed, to avoid more than two voltages input at the same time and cause safety issue. At performance efficient aspect, it makes comparison by using the same TI’s transceiver along with different TI and Free-Scale’s receiver. Among using these, TI’s receiver get the highest power transfer efficiency is 68% and Free-Scale’s receiver is 65%.
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Lu, Ching-Tung, e 呂衿同. "iSCSI Backup and Recovery Technology in Wireless Network". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/18713013008240503623.
Testo completoAbstract (sommario):
碩士國立中央大學
資訊工程學系碩士在職專班
95
Data backup via internet has become a trend, but the process is time-consuming and laboring, which interferes users’ normal working. Continuous Data Protection (CDP) monitors the data process with an agent program embedded in computer systems. It automatically copies the critical data to other drives or transmits data to the remote data center via internet, which successfully prevents operational troubles and enormous data transmission. Nowadays most portable computers have a built-in wireless network adapter, which is widely used to backup important data to the remote data center. Nevertheless, when transmitting data over a wireless network, CDP encounters problems of losing and repeating transmission for insufficient bandwidth, packet latency or high packet error rate. The long-time delay of computer systems seriously influences the overall efficiency, so CDP is so far not suitable for wireless networking environment. This study proposes a method to backup and restore CDP or critical data in portable computers before operating systems start. Our method begins by checking the accumulated log data and when the data reaches a certain threshold value, the system automatically turns on wireless network and connects to the remote data center. By copying the data to the data center promptly, the system could lower down the risk cost of data corruption. Using the wireless network evaluation system, we compared the performance of several different data transmission techniques. The results show that iSCSI (internet Small Computer System Interface), supporting multiple connections and asynchronous IO, can be a good transmission backbone of wireless networks because of its better transmission efficiency and greater tolerance of high network latency.
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洪子平. "Home Network：The Wireless Architecture Based on Bluetooth Technology". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/92300567618295234285.
Testo completo
50
Chen, Pei-Yuan, e 陳培源. "Applied Zigbee Technology in Wireless Location Tracking system". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/08992972418079717730.
Testo completoAbstract (sommario):
碩士正修科技大學
電子工程研究所
95
Nowadays due to the rapid development of wireless network technology and the great growth of the service demand, accurate location estimation has gained considerable attention.This research develops wireless sensor network by ZigBee technology. ZigBee is a Wireless Personal Area Network (WPAN) with the characteristics of low power consumption, low cost,two-way communication and sensor network capability.Global Positioning System (GPS) is a current positioning system for an open and wide area. However,GPS is not suitable for accurate indoor position locating. In this research we first establish the Received Signal Strength Indication（RSSI）database of the reference nodes and the RSSI of the mobile nodes,and then use a position allocation algorithm to compute the position estimation. We also develop a position allocation program to track object location. The developed system will be applied to personal allocation management and object location tracking system.