Media access control (MAC) protocols play a vital role in determining the performance of wireless local area networks (WLANs). While a variety of MAC protocols have been proposed recently for wireless LANs, the problem of efficient bandwidth utilization, higher throughput, lower mean delay, and fairness has not been fully solved yet. For example, IEEE 802.11 protocol does not perform well and the bandwidth utilization drops below 50% of the total bandwidth under heavy traffic load conditions.Therefore, in order to address these problems of WLANs under heavy traffic load, this thesis proposes a new scheme named Buffer MAC. We analyze the performance of Buffer MAC by using a number of simulation experiments based on ns-2 network simulator. Results show that the proposed Buffer MAC protocol not only improves bandwidth utilization of WLANs but also improves average packet delay, throughput and fairness performance under heavy traffic load conditions.This thesis also contains an exhaustive and comparative study of the new MAC protocol and the original IEEE 802.11 protocol. Some implementation aspects of Buffer MAC protocol are also discussed.

Thesis (M.S.)--State University of New York at Binghamton, Electrical Engineering Dept., 2006. / Includes bibliographical references.

<p>The purpose of the project was to develop the hardware to a microwave wireless system working </p><p>at the frequency 2.45 GHz. The functionality of the system should also be easy to understand </p><p>since the system is to be used in an educational purpose. Much time has been spent impedance </p><p>matching components, a task that proved to be harder than we expected. Other work that has been </p><p>is layout of all parts, filter construction and the writing of an easy to understand thesis. After the </p><p>parts had been completed, they were tested in a network analyzer and/or spectrum analyzer. </p><p>Successful full system test has been done up to 400 meters, the length the system is to be used </p><p>for.</p>

<p>In the recent past, wireless sensor networks have been introduced to use in many applications. To </p><p>design the networks, the factors needed to be considered are the coverage area, mobility, power </p><p>consumption, communication capabilities etc. The challenging goal of our project is to create a </p><p>simulator to support the wireless sensor network simulation. The network simulator (NS-2) which </p><p>supports both wire and wireless networks is implemented to be used with the wireless sensor </p><p>network. This implementation adds the sensor network classes which are environment, sensor </p><p>agent and sensor application classes and modifies the existing classes of wireless network in NS- </p><p>2. This NS-2 based simulator is used to test routing protocols – Destination-Sequenced Distance </p><p>Vector (DSDV), and Ad-Hoc On-Demand Distance Vector (AODV) as one part of simulations. </p><p>Finally, the sensor network application models and the extension methods of this NS-2 based </p><p>simulator for simulations in specific wireless sensor network applications are proposed.</p>

<p>Today's communication solution between the vehicle and trailer is one many see as a</p><p>non-viable solution, then breakdowns on both the lights and cables are common. Now, a</p><p>new innovation enters the market, a system that can transmit wireless control signals</p><p>between the vehicle and trailer.</p><p>Parvus and Zap, the two solutions that the projekt group has come up with during this</p><p>thesis work carried out over the last year on Utvecklingsingenjörsprogrammet.</p><p>Technologists Peter Jägevall and Christopher Åberg has developed this project on their</p><p>own. The group has developed various concepts and chosen to work on, two of them.</p><p>The project has resulted in this report and a prototype</p><p>The solution that the group has developed is a wireless communication between vehicle</p><p>and trailer. The project team has developed new power-efficient LED lighting fixtures in</p><p>order to implement an internal power source in the trailer. The result of this has become</p><p>a maintenance-free and wireless product to trailers. The vision is that you in the near</p><p>future will see this product on the Swedish roads.</p>

Power is a valuable resource. It is invaluable when for mobile devices. Mobile devices, due to their mobility cannot get a continuous source of power and derive their power from a battery contained in them. The main consumer of power in the mobile is its transmitter. With a limited power capacity of the batteries, it is always desirable that the transmit power of the mobile be minimized. The aim of this thesis is to introduce a new architecture to minimize this problem. It is called as "Stretchable Architectures". The stretched architecture involves an intermediary between the Mobile Station and the Base Station to carry the call between them. This type of connection is called a Stretched connection. We explain the energy efficiency of a Stretched Connection when compared to a Direct connection between the Mobile Station and Base Station. We investigate the factors affecting a Stretched connection and propose different Stretchable Architectures, suitable for different applications. The "Stretched Architecture" is analyzed for the three 3G standards: Multi-carrier Direct Spread CDMA (CDMA2000), Wideband CDMA (WCDMA) and Time Division-CDMA (TD-CDMA). / Graduation date: 2002

Dynamic DC offset is one of the biggest problems preventing the implementation of single chip receivers. This thesis presents a 2.4GHz downconversion mixer designed to work with adaptive DC offset cancellation for a fully integrated direct conversion receiver. Offset can be removed by dynamically changing the PFET load bias in a Gilbert Cell type mixer. A dual-loop algorithm, which was developed in separate work, controls a current-steering DAC that dynamically changes the PFET load bias of the mixer. The mixer has a gain of 8dB, an IIP3 of l7dBm, and a noise figure of 15dB. In addition a CMOS RF Front-End incorporating the offset cancellation mixer is presented that meets the specifications for Bluetooth. / Graduation date: 2001

Thesis (M.S.)--University of Florida, 2000. / Title from first page of PDF file. Document formatted into pages; contains x, 78 p.; also contains graphics. Vita. Includes bibliographical references (p. 76-77).

Thesis (M.S.) -- University of Texas at Dallas, 2006. / Includes vita. Includes bibliographical references (leaves 50-55)

Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 139-143).