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 52 for “"wlans"”.
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Coding in 802.11 WLANs
… is concerned with using FEC coding in 802.11 WLANs in more interesting ways that are better aligned with application requirements. For example, coding to support multicast tra±c rather than simple point to point tra±c; coding that is cognisant of the multiuser nature of the wireless channel; …
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Opportunistic Random Media Access in WLANs
<p>This thesis proposes a new medium access protocol for IEEE 802.11 wireless local area networks, which is called opp01tunistic medium access. The protocol changes the media access opportunities of nodes by adjusting the contention window dynamically according to the different bit rates. Thereby, …
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Distributive Time Division Multiplexed Localization Technique for WLANs
… the solution of a localization problem in indoor WLANs by introducing a distributive time division multiplexed localization technique based on the convex semidefinite programming. Convex optimizations have proven to give promising results but have limitations of computational complexity for a …
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Towards next generation WLANs: exploiting coordination and cooperation
Wireless Local Area Networks (WLANs) operating in the industrial, scientific and medical (ISM) radio bands have gained great popularity and increasing usage over the past few years. The corresponding MAC/PHY specification, the IEEE 802.11 standard, has also evolved to adapt to such development. …
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Phishing on Open WLANs: Threat and Preventive Measure
… 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 combines two very well known …
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Power evaluation and performance enhancement of CSMA/CA based WLANs.
… (CSMA/CA) based Wireless Local Area Networks (WLANs) are becoming pervasive. As the most commonly employed standard in WLANs, IEEE 802.11 not only gives rise to health and safety concern from the general public, but also has the potential for enhanced performance. Our contributions in this …
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Performance Evaluation of MU-MIMO WLANs Under the Impact of Traffic Dynamics
Downlink multiuser MIMO (DL MU-MIMO) has shown a great promise to enhance the performance of a wireless network by serving multiple users simultaneously. While researchers have focused on tackling the challenges involved in deploying these networks in the real world, little is known about their …
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Addressing the hidden terminal problem in MU-MIMO WLANs with relaxed zero-forcing approach
… on today’s Wireless Local Area Networks (WLANs). Several avenues such as bandwidth, constellation density, the Multiple Input Multiple Output (MIMO) technique, etc., have been explored, e.g., IEEE802.11n/ac standards, to keep up with the demand. Future WLAN standard, e.g., IEEE802.11ax, …
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Dual Wi-Fi: Dual Channel Wi-Fi for Congested WLANs with Asymmetric Traffic Loads
In many WLANs scenarios, the load transmitted from the AP to the clients (Downlink), far outweighs traffic demand from the clients to the AP (Uplink), thereby yielding traffic asymmetry. Moreover, when many clients associate with a single AP, the clients can cause a disproportional amount of medium …
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An improved medium access control protocol for real-time applications in WLANs and its firmware development
The IEEE 802.11 Wireless Local Area Network (WLAN), commonly known as Wi-Fi, has emerged as a popular internet access technology and researchers are continuously working on improvement of the quality of service (QoS) in WLAN by proposing new and efficient schemes. Voice and video over Internet …
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Load-Aware Traffic Control in Software-Defined Enterprise Wireless Local Area Networks
… modern enterprise Wireless Local Area Networks (WLANs) deployments always consist of multiple Access Points (APs) to meet the fast-increasing demand for wireless access. In order to avoid network congestion which leads to issues such as suboptimal Quality of Service (QoS) and degraded user …
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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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An admission control scheme for IEEE 802.11e wireless local area networks
… and use of 802.11 Wireless Local Area Networks (WLANs). These networks are easy to deploy and maintain, while providing reasonably high data rates at a low cost. In the paradigm of Next-Generation-Networks (NGNs), WLANs can be seen as an important access network technology to support IP …
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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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An Economic Model of Subscriber Offloading Between Mobile Network Operators and a WLAN Operator
… networks. Small-scale operators (SSOs) of WLANs are becoming more prevalent, while Mobile Network Operators (MNOs) seek an outlet for their customers' data usage. These conditions prompt the need for an effective relationship between the two parties for the purpose of offloading cellular …
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Sistemas integrados de la navegación mediante redes locales inalámbricas
… in the design of Wireless Local Area Networks (WLANs) and puts forward one particular configuration suitable for Integrated Navigation Systems (INSs).The choice of the Extremely High Frequency band (EHF) is based on two fundamental reasons. Firstly, EHF waves range from 30 to 300 GHz, which …
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Cross-layer design of random access wireless networks
… become the de facto standard widely used in both WLANs and MANETs. This thesis focuses on the random access protocol with emphasis on its interactions with other protocols across different layers, including physical layer, transport layer, networking layer and application layer. We exploit several …
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Modelling and Analysis of Resource Management Schemes in Wireless Networks. Analytical Models and Performance Evaluation of Handoff Schemes and Resource Re-Allocation in Homogeneous and Heterogeneous Wireless Cellular Networks.
… Microcells in the HCN can be replaced by WLANs as this can provide high bandwidth and its users have limited mobility features. Efficient sharing of resources between wireless cellular networks and WLANs will improve the capacity as well as QoS metrics. This thesis first presents an …
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Enabling Theoretical Model Based Techniques for Simulating Large Scale Networks
… transmission activities in IEEE 802.11-operated WLANs, and used it to explore whether or not fluid model-based simulation is effective in simulating WLANs. Fluid model based simulation is not well-suited for studying the network behavior under light and/or sporadic traffic, as it assumes a large …
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Analysis and improvement of medium access control protocols in wireless networks. Performance modelling and Quality-of-Service enhancement of IEEE 802.11e MAC in wireless local area networks under heterogeneous multimedia traffic.
… MAC protocols in Wireless Local Area Networks (WLANs) under heterogeneous multimedia traffic. To support the MAC-layer QoS in WLANs, the IEEE 802.11e Enhanced Distributed Channel Access (EDCA) protocol has proposed three QoS differentiation schemes in terms of Arbitrary Inter-Frame Space (AIFS), …
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