Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"Wireless LANs"”.
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Mobile IP movement detection optimisations in 802.11 wireless LANs
… to support the establishment of highly flexible wireless local area networks (wireless LANs). However, when an 802.11 mobile node moves from a wireless LAN on one IP network to a wireless LAN on a different network, an IP layer handoff occurs. During the handoff, the mobile node's IP settings …
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Probe request attack detection in wireless LANs using intelligent techniques
… approach to recognise probe request attacks in Wireless Local Area Networks (WLAN). In WLANs, management frames facilitate wireless stations (STA) to establish and maintain communications. In infrastructure WLANs, any mobile STA can send a probe request management frame when it needs information …
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Adaptive multimedia streaming control algorithm in wireless LANs and 4G networks
… many users are accessing learning content via wireless networks and using mobile devices. Most content is rich media-based and often puts significant pressure on the existing wireless networks in order to support high quality of delivery. In this context, offering a solution for improving user …
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Improving packet delivery efficiency using multi-radio diversity in wireless LANs
Data transmissions in Wireless Local Area Networks (WLANs) often suffer from bit errors that arise from the notoriously complex and time-varying signal propagation characteristics of the wireless medium. A number of physical factors such as attenuation and multi-path are prevalent indoors and can …
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Improving aggregate user utilities and providing fairness in multi-rate wireless LANs
… and fairly among competing devices using a wireless local area network. Unfortunately, existing MAC protocols, including 802.11's DCF, achieve neither efficiency nor fairness under many realistic conditions. In this dissertation, we show that both bit and frame-based fairness,the most widely …
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Research and development of a reference model for intrusion handling systems in wireless LANs
Wireless Local Area Networks (WLANs) are different from the traditional wired LANs in terms of their easy exposure to potential threats and vulnerability to exploitation. Hence, there is an urgent need for effective Intrusion Handling Systems (IHSs) and the methods for their evaluation. Analyses of …
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Design of MAC protocols to support quality of service for multimedia traffic in wireless LANs
… of 802.11 MAC protocol standards for wireless local area network (WLAN) in 1999 by the IEEE task force group, WLAN has experienced tremendous growth. This can be observed by the increasing number of “hotspots” in public places such as airports, train stations, shopping complexes and …
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OWSS And MIMO-STC-OFDM: Signaling Systems for the Next Generation of High Speed Wireless LANs
The current popularity of WLANs is a testament primarily to their convenience, cost efficiency and ease of integration. Even now the demand for high data rate wireless communications has increased fourfold as consumers demand better multimedia communications over the wireless medium. The next …
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Implementation and Analysis of Wireless Local Area Networks for High-Mobility Telematics
Wireless networks provide communications to fixed, portable and mobile users and offer substantial flexibility to both end-users and service providers. Current cellular/PCS networks do not offer cost effective high data rate services for applications, such as, telematics, traffic surveillance and …
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Optimal Access Point Selection and Channel Assignment in IEEE 802.11 Networks
Designing 802.11 wireless networks includes two major components: selection of access points (APs) in the demand areas and assignment of radio frequencies to each AP. Coverage and capacity are some key issues when placing APs in a demand area. APs need to cover all users. A user is considered …
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Exploiting wireless broadcast property to improve performance of distributed algorithms and mac protocols in wireless networks
Because a wireless channel is a shared medium, messages sent on the wireless links might be overheard by the neighboring stations. The information obtained from the overheard messages can be used in order to design more efficient distributed algorithms as well as MAC protocols for wireless …
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Efficient Packet Scheduling in Wireless Multihop Networks
… scheduling significantly different from that in wireless LANs. In this dissertation, we also discuss issues related to priority scheduling in multihop networks. A priority scheduling protocol is proposed to ensure channel access privilege of high priority packets and to improve the channel …
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A QoS capable architecture for IEEE 80211 wireless LAN and the prototype implementation on Linux
The increasing popularity of wireless handheld devices with multimedia functionality and IEEE 802.11 based network connectivity generated the need for Quality of Service (QoS) support of real time applications deployed over the wireless LANs. However, the time varying nature of wireless link and …
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Reliable and efficient wireless communication channel management using optimization and artificial intelligence
With the growing ubiquity of mobile devices and wireless connectivity, ensuring efficient and reliable communication across various environments has become increasingly important. In densely deployed Enterprise Wireless LANs (E-WLANs), traditional strongest-signal-based Access Point (AP) selection …
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An R.F. data link
… transmission/reception system. Small range wireless communications between computers is currently being studied in great depth by companies like Motorola, Agilis and O'Neill who are introducing wireless LANs in the market using a carrier frequency of 18 GHz transmitting 9.6k bit/s of …
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Reconfigurable tunable microwave devices using liquid crystal.
… developed GPS, smart mobile phones, radars, wireless LANs, satellite communications and implantable medical devices. The shortage in the available frequency spectrum for radio communications, the demand for portable wireless devices, and the requirement for more functionality in an even …
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Phishing on Open WLANs: Threat and Preventive Measure
… of a phishing attack on open, private Wireless LANs. Private WLANs which use a login page to authenticate users in hotels, airports and academic campuses are all vulnerable to this attack. Virginia Tech's WLAN is used as an example to show that the attack is possible. The attack …
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Optimization and Algorithms for Wireless Networks: Enhancing Problem Solvability, Channel Bonding Under Demand Stochasticity, and Receiver Characteristic Awareness
… The second problem is optimal channel bonding in wireless LANs under demand uncertainty. An access point (AP) can aggregate multiple contiguous channels to satisfy demand. We discuss how to optimally utilize available frequency bands under uncertainty in AP demand using two stochastic optimization …
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Effects of denial of service attack in WIFI-broadband networks.
… public sector networks. Over the recent past, Wireless communications have become increasingly popular in our everyday life and the world has become increasingly mobile. Traditional "wired" networks have proven inadequate to meet the challenges posed in this new era. As a result, wireless …
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