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Dissertations / Theses on the topic 'WLAN'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Memon, Abdul Qudoos, Ali Hasan Raza, and Sadia Iqbal Iqbal. "WLAN Security : WLAN Security." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-4379.

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<p>WLANs are become popular due to their different advantages. Beside all these advantages WLANs are also facing the major problem of the security, so that why lots of people are doing research on WLAN to improve the security because many companies want to transfer their sensible data over WLAN.</p><p>This report discusses the security issues of WLAN based on IEEE 802.11 standard, such type of networks are referred to as wifi network. WLAN is deployed as an extension of already existed wired LAN. Therefore it is necessary to provide the security of WLAN equals to Wired LAN.</p><p>We worked in

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Nyman, Pontus, and Stefan Sand. "Industrial WLAN." Thesis, Malmö högskola, Fakulteten för teknik och samhälle (TS), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20340.

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WLAN i form av standarden IEEE 802.11 används inte i större utsträckning i industriell miljö. Vi undersöker hur pass protokollet kan användas för datakommunikation i sådan miljö med avseende på störningskänslighet och datorkraftsbehov, i form av en empirisk undersökning. Dessa undersökningar har utförts på en industri med de tre vanligaste standarderna IEEE 802.11b/g/n. Syftet med denna uppsats är att kontrollera vad som stör signalerna samt om den nyaste standarden 802.11n har något nytt som kan revolutionera inriktningen. Tester och undersökningar har visat att 802.11b och 802.11n är bäst nä

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3

Nordqvist, Petter. "CAN-WLAN brygga." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-58130.

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Rapporten täcker konstruktionen av en CAN-WLAN brygga från schemaritning ända till en nästintill konsumentfärdig produkt med inkapsling. Bryggan använder sig av mikroprocessorn AT90CAN128 tillsammans med WLAN-modulen WIZ610wi för att hantera kommunikation av CAN respektive WLAN. Bryggan är tänkt att monteras stationärt på en maskin/fordon som har en implementerad CAN-bus. Man kan sedan via smartphone eller bärbar dator avläsa informationen på CAN-bussen samt skicka ut CAN-paket. Allting sker via webbläsaren i den mobila enheten. Nätdel och kapsling har konstruerats av beställaren, Electrum. Re

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4

Yeo, Jihwang. "WLAN workload characterization." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2825.

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Thesis (M.S.) -- University of Maryland, College Park, 2005.<br>Thesis research directed by: Dept. of Computer Science. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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5

Strand, Erlend Barstad. "WISA vs. WLAN: Co-existence challenges : - A tool for WLAN performance testing." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8789.

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<p>Wireless Interface for Sensors and Actuators (WISA) is ABB's proprietary wireless protocol for industrial automation on the factory floor. It operates in the 2.4GHz ISM band. Wireless Local Area Networks (WLANs), which typically occupy a fixed portion of the same 2.4GHz ISM band, are becoming more and more common on the factory floor. This raises a question of co-existence and how the performance of traffic over WLAN is affected when interfered by WISA. This report is a result of the development of a software tool and assembly of hardware that can aid the future testing of the effect WISA h

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6

Andersson, Pierre, and Arvid Norlander. "Indoor Positioning Using WLAN." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-23461.

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This report evaluates various methods that can be used to position a smartphone running the Android platform, without the use of any special hardware or infrastructure and in conditions where GPS is unavailable or unreliable; such as indoors. Furthermore, it covers the implementation of such a system with the use of a deterministic fingerprinting method that is reasonably device independent, a method which involves measuring a series of reference points, called fingerprints, in an area and using those to locate the user. The project was carried on behalf of Sigma, a Swedish software consulting

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7

Plaisner, Denis. "LTE-Advanced/WLAN testbed." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316419.

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This thesis deals with the investigation and assessment of communication standards LTE-Advance and WiFi (IEEE 802.11n/ac). The EVM error parameter is examined for each standard. To work with different standards a universal workplace have been proposed (testbed). This universal workplace serves for adjusting transmitting and receiving means and for processing signals transmitted and interpreted. Matlab was chosen for this work, through which only control devices such as generators and analyzers from Rohde & Schwarz. This workplace also measures the coexistence of these standards. At the conclus

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8

Falade, Olumuyiwa, and Marcellus Botsio. "Mobile IP Handover for WLAN." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-4903.

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<p>The past few years have seen great increases in the use of portable devices like laptops, palmtops, etc. This has also led to the dramatic increase demand on wireless local area networks (WLAN) due to the flexibility and ease of use that it offers. Mobile IP and handover are important issues to be considered as these devices move within and between different networks and still have to maintain connectivity. It is, therefore, imperative to ensure seamless mobile IP handover for these devices as they move about.</p><p>In this thesis we undertake a survey to describe the real processes involve

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9

Horndahl, Charles, and Kristian Maric. "WLAN : Oskyddad och okontrollerad datakommunikation." Thesis, Jönköping University, JIBS, Business Informatics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-236.

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<p>This master’s thesis investigates the technology and security awareness associated with wireless networks (WLAN). It has been stated by the media and theories that many wireless networks are unprotected. This has sparked an interest to investigate the phenomenon in the Jonkoping region. The study is based on the following research questions:</p><p>- What security weaknesses are present with the WLAN-technology and how can these be avoided?</p><p>- How does the wireless infrastructure in the Jonkoping region look like?</p><p>- Why do companies implement the WLAN-technology?</p><p>- Are the c

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10

Elgström, John, and Daniel Teige. "Säkerhet i WLAN för myndigheter." Thesis, Örebro University, Swedish Business School at Örebro University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-4880.

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<p>I datornätverk blir användandet av WLAN (trådlösa nätverk) allt vanligare tack vare sin smidighet. Det är framförallt bekvämare att använda trådlösa nätverk då man slipper allt kablage och ofta är oberoende av var man befinner sig för att använda nätverket. Trådlösa nätverk är dock inte helt problemfria. Den främsta anledningen till detta är att informationen färdas genom radiovågor istället för genom kablade nätverk. Detta gör att WLAN är i riskzonen för avlyssning, där informationen kan utsättas för obehörig åtkomst om den inte är väl skyddad. Detta problem är grunden till denna uppsats.<

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11

Luo, Anqi, and Lei Ge. "Indoor Location Detection using WLAN." Thesis, KTH, Kommunikationssystem, CoS, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91200.

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The thesis seeks to improve the accuracy of indoor wireless local area network (WLAN) location detection. The main task of the project is the design and analysis of a solution, which utilizes the packets which are already emitted by WLAN devices. The system consists of a signal receiver and signal processing. The positioning system does not transmit, thus the detection is completely passive. The result of measurements on received frames is used to calculate the WLAN transmitter's position. It does not require any transmissions, thus the detection is completely passive. The result of the measur

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Heiskanen, Jari. "WLAN prestanda i IEEE 802.11n." Thesis, Blekinge Tekniska Högskola, Avdelningen för programvarusystem, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5233.

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WLAN/n är en attraktiv teknik då det ökar data genomströmningen och räckvidden med ökad effektivitet som ger mer bits per sekund. Utvecklingen inom 802.11n har ökat data raten och prestanda till högre nivåer. En teknik är att använda multipla antenner för sändare och mottagare för att sända multipla data strömmar genom MIMO system för n standarden. Mobila enheter i en cell kanske inte har fixerade positioner i cellen så utveckling av mer avancerade algoritmer som OFDM har också utvecklats och presenteras i den här rapporten. Interference för signalen är ett dilemma då den beräknade mängden av

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13

Castro-Arvizu, Juan Manuel. "Robust indoor positioning in WLAN networks." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/405889.

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Navigation and location technologies have been reaching in a major interest where Global Navigation Satellite System (GNSS) is mostly adopted. The limitation of this technology is that direct sky view is needed for reliable positioning. In indoor environments, however, it is difficult for GNSS technology to provide a reliable performance in positioning due to the signal attenuation and blocking caused by buildings and construction materials. For this reason, the growth in indoor applications has focused the research in new techniques for attempting mitigate the poor GNSS performance on this ty

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14

Brännberg, Anders, and Robin Persson. "Automatisering av testprocess för WLAN-kort." Thesis, University West, Department of Technology, Mathematics and Computer Science, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-536.

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15

Falk, Magnus. "Snabb och säker roaming i WLAN." Thesis, Linköping University, Department of Computer and Information Science, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2695.

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<p>This thesis investigates how Ericsson AB should do to achieve fast and secure handover when roaming in a WLAN. It also provides a security analysis of the system that the wireless access point is part of. The reason for this is that Ericsson is selling an access point called the ABS 2200 aimed at the public hotspot market. </p><p>The premise was that they wanted a standardized way of handling the roaming issue. At the outset the 802.11F standard looked like a good alternative (in fact the only standardized alternative). Towards last stages of the work though, it was discovered that the 802.

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Khoulani, Amer, and Ramaz Samhan. "Performance Analysis of WLAN MAC Algorithms." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3200.

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Lately, researchers were trying to put a lot of efforts to enhance the performance of Wireless LANs. IEEE 802.11 algorithm, DCF, was an interesting subject for studies. Most studies were concentrating on avoiding collisions, packets loss, decreasing transmission delay and enhancing the overall performance of the network. Double Increment Double Decrement (DIDD) was introduced as a solution that enhance the performance by applying some changes in the algorithm. The main changes were applied on the Contention Window (CW). IEEE 802.11e introduced a new algorithm (EDCA) that introduces a QoS to th

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NAJNUDEL, MARCELO. "INDOOR PROPAGATION STUDIES FOR WLAN PLANNING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5069@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Recentemente, tem sido observado um crescimento explosivo na utilização de redes de acesso local sem fio (Wireless Local Area Networks - WLANs), utilizando equipamentos de nível de radiação restrito operando em bandas independentes de outorga de uso de rádio freqüência, tanto para uso corporativo como doméstico e para prover acesso pago em ambientes públicos como aeroportos, hotéis, centros de convenções, campi universitários e mesmo restaurantes e cafés. Se estas redes serão complementares ou competidoras das redes celul

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Svensson, Carolin. "Anomaly Detection in Encrypted WLAN Traffic." Thesis, Linköpings universitet, Kommunikationssystem, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-172689.

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19

Pfüller, Patric. "Aufbau einer Location Based Services Infrastruktur im Wireless Local Area Network des Chemnitzer Kulturkaufhauses "Das Tietz"." Master's thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-24142.

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Ciurana, Adell Marc. "Contributions to TOA-based location with wlan." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/77902.

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Location techniques that satisfy the requirements of advanced Location-Based Services (LBS) in environments where GPS fails are needed, therefore accurate indoor positioning is becoming increasingly important. This PhD Thesis is devoted to the research on location of mobile devices employing WLAN (IEEE 802.11). The use of this kind of wireless networks infrastructures for positioning enables a powerful synergy between communications and location and allows solutions with good performances at moderated costs. However the adopted WLAN location methods suffer from important limitations that preve

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Nyström, Joakim, and Mikael Seppälä. "Experimental Study of GPRS/WLAN Systems Integration." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1750.

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<p>The convergence of future networks relies on the evolution of technology that enables seamless roaming abilities across non-heterogenous networks for mobile clients. This thesis presents an experimental study of a GPRS-WLAN integration scenario where the objective is to analyze various aspects of the issues related to charging, mobility, roaming and security between GPRS and WLAN networks. The mainly discussed integration scenario in this thesis is loosely coupled systems working on RADIUS platforms, which together with MobileIP and IPSec provides the mobile client with a secure and access-

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Bækkelund, Ørjan. "Session hijacking in WLAN based public networks." Thesis, Norwegian University of Science and Technology, Department of Telematics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9874.

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<p>The background for this masters thesis is the threat of session hijacking in public wireless networks. A public wireless network in this context is a network such as Wireless Trondheim where users with WLAN enabled devices can connect for a small fee for a given period of time. These kind of networks relies on having a high degree of user friendliness to reach users with average knowledge in computers and wireless networks. There is always a struggle between user friendliness and security and the downside to the user friendliness in these kind of networks is poor security. Many of these ne

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Wiese, Gerhard Christoffer. "Fingerprintløsning for lokalisering ved bruk av WLAN." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for telematikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11412.

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I forbindelse med denne masteroppgaven har det blitt designet, implementert og testet en nettsentrert lokaliseringsløsning for WLAN. Løsningen baserer seg på innsamling av lokasjonsdata i form av lokasjonsfingeravtrykk. Ved å benytte lokasjonsfingeravtrykk har det blitt oppnådd en universell lokaliseringsløsning som vil kunne fungere i alle trådløse nettverk, og som baserer seg på allerede eksisterende trådløs infrastruktur. I tidligere forskning på lokaliseringsløsninger basert på fingeravtrykk, har det blitt tatt i bruk relativt begrensede dekningsområder. Samtidig har innsamlingen av lokasj

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Vizcaino, Luna Alexandre. "Characterizing WLAN Channel Occupancy for Cognitive Networking." Thesis, KTH, Kommunikationsnät, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99169.

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The deployment of heterogeneous wireless networks in the same spectrum space introduces the need for dynamic spectrum access so as to increase the utilization of the available wireless resources. Dynamic spectrum access needs to be controlled in order avoid interference between the users of different systems. Different schemes can be used in order to avoid the mutual interference between the systems: orthogonality in space, frequency or time. In this thesis we address the problem with a solution based on time orthogonality, in which the coexisting wirless systems are a WLAN and WSN. Due to the

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Magnusson, Maria. "LAN and WLAN planning, deployment, and evaluation." Thesis, KTH, Kommunikationssystem, CoS, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118346.

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Switch Nordic Green AB (Nordic Green Energy) is an energy company with about 40 employees. The customer service department is in-house and a lot of the work, by all departments, is done by programs running on remote servers. Today most of the network traffic is through a wired local area network, although there is a wireless guest network which is very unstable. While planning a move to a smaller office the company is planning to implement a more extensive wireless local area network. This bachelor thesis will provide a basis for implementing the local area network and wireless local area net

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Benmimoune, Abderrahmane. "Handoff vertical entre réseau UMTS et WLAN." Mémoire, École de technologie supérieure, 2010. http://espace.etsmtl.ca/627/1/BENMIMOUNE_Abderrahmane.pdf.

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Un des principaux défis majeurs des prochaines générations des systèmes de communication sans fil serait d'utiliser les ressources limitées des réseaux de communications d'une manière efficace à l'effet d'obtenir une qualité et une capacité qui soient suffisantes pour faire face à des demandes sans cesse croissante de services. En effet, les besoins en bande passante des utilisateurs ont augmenté en raison des résultats satisfaisants relevés des différentes applications telles que la vidéo et la navigation sur Internet. Ceci a permit à plusieurs technologies de voir le jour et qui ne ces

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Jiang, Ming-Chia, and 江明嘉. "WLAN-Centric Authentication in Integrated GPRS-WLAN Networks." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/51290847307414415456.

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碩士<br>國立清華大學<br>資訊工程學系<br>91<br>A SIM-based authentication is preferable for GPRS operators for the integrated GPRS-WLAN networks. It requires WLAN system process the GPRS-based authentication and transport the GPRS authentication messages back to the GPRS networks. This thesis presents an alternative WLAN-centric approach based on the perspective of WLAN providers. The proposed WLAN-centric authentication instead leverages the widely used WLAN-based authentication and requires the GPRS operator install an AAA (Authentication, Authorization, and Accounting) server. The pr

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McEwan, Neil J., Raed A. Abd-Alhameed, Embarak M. Ibrahim, Peter S. Excell, and N. T. Ali. "Compact WLAN Disc Antennas." 2002. http://hdl.handle.net/10454/3861.

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No<br>A novel conical beam patch antenna design, suitable for local area network applications, uses a central cylindrical connection from the disc to ground to achieve a large reduction in resonant size. Results on efficiency, bandwidth, and pattern are reported for several prototypes.

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Ho, I.-Chung, and 賀宜中. "Smart Connection Architecture for WLAN." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/12881793098900300228.

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碩士<br>國立臺灣大學<br>資訊工程學研究所<br>95<br>Over the past few years, there has been a tremendous growth in the market of mobile computing devices exemplified by the laptop computers. Also the ease of installation and low cost of IEEE 802.11 network, contribute to the enormous growth in the adoption of WLAN. Amid this trend, High-Density WLAN has emerged, which comprises of a large number of Access Points (APs). However, with the current connection architecture, we select an AP among such High-Density WLAN only base on signal strength, which can lead to bad performance due to its ignorance of the load at

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Shen, Guan-Yin, and 沈冠穎. "CPW-FED WiMAX/WLAN ANTENNAS." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/69463982720163812966.

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碩士<br>大同大學<br>通訊工程研究所<br>97<br>In this thesis, two unique approaches are respectively applied to design a CPW-fed circularly and a linearly polarized antenna. For the circularly polarized antenna, center conductor of the CPW is bended into a semi-circular shape and two ground branches of the CPW are connected together to form an open-aperture. We may consider that center conductor of the CPW is modified to form the first type and is protruded into the aperture. By keeping this aperture, the center conductor of the CPW can be modified into the second type. The second type results in the line

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Chen, Zong-Liang, and 陳宗良. "Traffic Estimation Using WLAN Infrastructure." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/75860560247358397431.

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碩士<br>國立高雄應用科技大學<br>電子工程系碩士班<br>102<br>It is almost everyone has a smart phone due to rapid advance of technologies in recent years. The GPS (Global Position Services), Wi-Fi and other wireless communication devices had become standard equipment. This leads to more and more location-based services (Location Based Services, LBS). As visiting popular tourist attractions, people often share their location and photos with their friends with handheld devices. Wi-Fi is encouraged and even deployed by government policies, such as Taipei City Government's TPE-FREE. The makes Wi-Fi AP (Access Points)

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Chen, Jiang-Jen, and 陳建臻. "Smart Card Applications on WLAN." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/49051893694632789539.

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碩士<br>國立臺灣大學<br>資訊工程學研究所<br>93<br>Along with the progressing of technology, wireless Internet is becoming popular. Users can use the Internet everywhere with wireless Internet. There are many solutions about wireless Internet. We try to find out the best way that can be applied to the current environment and combine most advantages of existing wireless solutions. There are many applications of smart card, such as bankcards, credit cards, health card, certificate cards, and SIM cards especially. Nowadays mobile phones have become a daily necessity. Since it is safer for users to do authenticat

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Huang, Yu-Ting, and 黃鈺婷. "IEEE 802.11a WLAN Transmitter Design." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/01753778761792772302.

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碩士<br>國立中興大學<br>電機工程學系<br>92<br>The development of wireless communication systems for high data-rate transmission has become one of important researches. In this thesis, design of the baseband transmitter is simulated and verified in MATLAB environment. The result shows that functional blocks of the transmitter can meet the standard specifications. FIR filters are often used in signal processing and spectral analysis. The digital FIR filter plays an important role. In the thesis, a Nyquist digital filter, i.e., a raised cosine filter, for IEEE 802.11a of WLAN BBP will be implemented

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Tsai, Hsiao-ping, and 蔡曉萍. "WLAN Polarization Diversity Antenna Design." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/90585781163752767211.

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碩士<br>國立臺灣大學<br>電機工程學系<br>85<br>In an indoor radio environment plagued by the severe spatial fading and temporal fading effects of multipath, diversity schemes usually required. This thesis proposes a flat diversity antenna, consisting of two cross-polarized dipole antennas selectly excited by a PIN diode at the feeding point, to reduce the fading effects in the indoor environment. Results presented here provide a comparison between measurement and simulation results of input impedance and

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Ho, I.-Chung. "Smart Connection Architecture for WLAN." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-0207200714202800.

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Cheng, Chia-yuan, and 鄭嘉元. "WLAN-based Indoor Positioning System." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/98945117130365104652.

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碩士<br>義守大學<br>機械與自動化工程學系碩士班<br>93<br>With the prevalence and development of the Internet, the network infrastructure begins to extend from the original wired network to the wireless network. In recent years, the development of wireless network attracts much attention in various applications. Due to the widespread use of the wireless network. One of the applications is personal or device locating service of location. With the increasing demand of the positioning service, people pay much attention to the indoor wireless positioning system based on Wireless Local Area Networks (WLAN). Nowadays, G

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Hwamg, Shao-Chun, and 黃卲雋. "Simulink Platform of WLAN Systems." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/57454745347463913329.

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碩士<br>中華大學<br>電機工程學系(所)<br>94<br>Since the WLAN was invented, information that transmitted through WLAN gradually increase and standards for high-speed WLAN are weeded through the old to bring forth the new continuously. Form the early IEEE Std 802.11-1997, IEEE Std 802.11b-1999 and IEEE Std 802.11a-1999 to the hottest WLAN standard, IEEE Std 802.11g™-2003, the speed of WLAN is up to 54 Mbit/s. Standards referred above will be introduced and implemented on software platform one by one. First, specification for each system would be introduced. Then, baseband transceivers, implemented with SIMUL

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莊逸民. "Research on WLAN Preamble Receiver." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/07699601590019927889.

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碩士<br>中華大學<br>電機工程學系碩士班<br>90<br>For the rapidly increasing requirements of wireless data communications, the orthogonal frequency division multiplexing (OFDM) techniques have been heavily developed in recent years. In July 1998, the IEEE standardization group decided to select OFDM as the basic multiplexing technique for their new 5-GHz wireless local area network (WLAN) standard, and this new standard is the first one to use OFDM in packet-based communications, while the use of OFDM was limited to continuous transmission systems before. In this thesis, basic OFDM principles, the e

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TU, CHIEN-I., and 杜建一. "WLAN Performance and Quality Analysis." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/p5b59c.

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碩士<br>國立臺北科技大學<br>光電工程系所<br>97<br>This paper will discuss for Wireless Local Access Network (WLAN) system measurement. With Multi-Input Multi-output (MIMO) technology and modify system parameters, we also enhance system performance to reach commercial use purpose. First at all, we setup a WLAN transmission environment which comply IEEE 802.11b/g standard in the Lab with standard antenna and accessories. With the Spectrum analyzer, reference RF card and Network analyzer, we can calculate the basic performance parameters for this WLAN system. Then we propose the upgrade plan for existing sys

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Banaser, Hesham Hassan. "High Performance WLAN Using Smart Antenna." Thesis, 2007. http://hdl.handle.net/10012/3303.

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The need for higher data rates in WLANs boosts drastically because tremendous consumer interest in emerging multimedia applications, such as HDTV, has been increased. Currently, the IEEE 802.11a/b/g WLANs provide a limited data rate for the current user application requirements. In order to overcome substantial limitations of the existing WLANs, the next generation of WLANs, IEEE 802.11n, is in the course of development and expected to support higher throughput, larger coverage area and better QoS. The high performance IEEE 802.11n WLAN can improve data rate significantly by using smart antenn

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Falaki, Mohammad Hossein. "WLAN Interface Management on Mobile Devices." Thesis, 2008. http://hdl.handle.net/10012/3854.

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The number of smartphones in use is overwhelmingly increasing every year. These devices rely on connectivity to the Internet for the majority of their applications. The ever-increasing number of deployed 802.11 wireless access points and the relatively high cost of other data services make the case for opportunistic communication using free WiFi hot-spots. However, this requires effective management of the WLAN interface, because by design the energy cost of WLAN scanning and interface idle operation is high and energy is a primary resource on mobile devices. This thesis studies the WLAN i

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Chen, Teng-Kai. "Design of SAW Filters for WLAN." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1607200613461800.

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Grotkopp, Alexander Böringer René. "Automatisierte Funknetzplanung für große WLAN-Netze /." 2007. http://www.gbv.de/dms/ilmenau/abs/524076553grotk.txt.

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Pan, Min-Nan, and 潘敏男. "Research of WLAN 802.11b/g Booster." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/66479216129039561046.

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碩士<br>樹德科技大學<br>電腦與通訊研究所<br>93<br>Abstract Focal point that communication science and technology still develop for various countries so far, the business opportunity brought by it is limitless, setting-up of the mobile communication system, have driven the development of the wireless local area network, What each mobile communication company puts into the large-scale base station of WLAN laying, in some public service organizations, such as the school, publicly-owned and private organ, station , coffee shop , department store , restaurant ,etc, have already erected the small-scale base statio

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Chou, Tung-Sheng, and 周東生. "Antennas Design For 802.11n WLAN AP." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/gamzd2.

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碩士<br>國立中央大學<br>通訊工程研究所碩士在職專班<br>96<br>Purpose that thesis study this is it discuss which kind of antenna is it apply to 802.11n WLAN AP most to make up to lie in, and design the antenna in analysis according to this. Introduction of WLAN, is it analyses why it will be antenna demand of system this to go on then from the beginning, and then design, improve from various kinds of parameter characteristics of the antenna, and then after the verification of the electromagnetic simulation software, entering and proving and testing in fact, get an intact antenna of associations finally, its characte

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Shih, Cheng-Kuei, and 師正魁. "On Study of WLAN Billing Systems." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/8j5eq6.

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碩士<br>靜宜大學<br>資訊管理學系研究所<br>92<br>Nowadays, many advantages of wireless have been discussed such as high movement and easy to use, and more and more places equip wireless network for customers to use. At present, the commercial WLANs charge the subscribers in “time-prepaid” mode or “time-used” mode. In this thesis, we proposed a billing system that supports four billing modes in the underlying WLAN. The billing system adopts FreeRADIUS to be the Authentication Server, the Cisco 1231 Access Point (NAS build-in) to be the Authenticator, and builds a Web-based Application Server by PHP and MySQL.

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Wen, Shu-Hui, and 溫淑惠. "Design and Measurement of WLAN Antennas." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/2h7mb5.

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碩士<br>國立臺北科技大學<br>電腦與通訊研究所<br>99<br>Wireless communication technology has changed our lives during the passing decades. Wireless local area networks (WLAN) is one of the most important applications of the wireless communication technology. The demand for WLAN is becoming popular throughout the world in a greater extent, since it provides high speed connectivity and easy access to networks without wiring. The study mainly focuses on the current trends in development of compact and low profile Wi-Fi PDA and smart mobile phone and provides a wideband monopole antenna design suitable for applicati

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Lu, Sheng-Yu, and 盧勝瑜. "MIMO Antenna Design for WLAN System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/8ykk65.

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碩士<br>國立臺北科技大學<br>電腦與通訊研究所<br>102<br>In the design of wireless access point radio frequency circuit, harmonic distortion, noise interference, antenna isolation electromagnetic interference are key issues. In this paper, we analyze and provide solutions during the design phase. The non-linearity of power amplifier will cause harmonic distortion and impact the EMI/EMC safety, therefore we use the filters to suppress. (2) Using the cavity resonance to suppress the high order mode harmonic distortion of wireless radio chip, and also find out the tuning variable to improve the performance. (3) DDR(

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Chen, Teng-Kai, and 陳登凱. "Design of SAW Filters for WLAN." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/67982804281030601609.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>94<br>In this thesis, coupling-of-modes (COM) approach and equivalent circuit model (ECM) are applied to design surface-acoustic wave (SAW) filters for various applications. A ladder-type SAW filter at IEEE 802.11a WLAN band is designed and the chip size is 214 × 115 μm2. An RF filter for unlicensed band of WiMAX and 802.11b WLAN is proposed and the chip size is 431 × 145 μm2. A miniaturized low-loss SAW duplexer has been developed for the WiMAX band and the chip size is 295 × 226.5 μm2. A six-channel low-loss switchable SAW filter bank is designed for the WiMAX sys

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Lin, Yu-De, and 林育德. "IEEE802.11b WLAN Circuits Design and Test." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/35360347316243800065.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>93<br>In this thesis, the design and test of IEEE 802.11b WLAN circuits are described. The circuit blocks consist of baseband processor RF3002, IF and RF transceiver RF2958, power amplifier RF5189, RF filter, RF switches, IF SAW filter and regulators. The circuits are fabricated with four-layer PCB process. The implemented wireless LAN card can provide four kinds of data rates which are 1Mbps(DSSS), 2Mbps(DSSS), 5.5Mbps(CCK), and 11Mbps(CCK) based on IEEE802.11b specification. For the software implementation, the C language code compiled by Keil is downloaded to the

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