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 33 for “"Media Access Control"”.
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Design of Media Access Control Schemes for Performance Enhancement of Future Generation Wireless Systems
… resource. WLAN devices utilize a complex medium access control (MAC) mechanism to allow multiple users to share the wireless resource. The distributed coordination function (DCF) is the most commonly used multiple access scheme in WLANs and a member of the 802.11 standard [1]. In this thesis, two …
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Efficient Media Access Control and Distributed Channel-aware Scheduling for Wireless Ad-Hoc Networks
We address the problem of channel-aware scheduling for wireless ad-hoc networks, where the channel state information (CSI) are utilized to improve the overall system performance instead of the individual link performance. In our framework, multiple links cooperate to schedule data transmission in a …
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Enhancing the energy efficiency of ultra wideband (UWB) based media access control (MAC) protocols in mobile ad-hoc networks (MANETs) through the use of steerable directional antenna
… area, research on the way directional antennas access the wireless medium specific to Ultra-WideBand (UWB) systems have not gained wide attention. The aim of this research is to design, implement and test an improved Medium Access Control (MAC) protocol for UWB systems in order to minimise …
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Design and analysis of energy-efficient media access control protocols in wireless sensor networks. Design and analysis of MAC layer protocols using low duty cycle technique to improve energy efficient and enhance communication performance in wireless sensor networks.
… nodes. These concerns are managed by medium access control (MAC) layer protocols. MAC protocols designed specifically for WSN have an additional responsibility of managing radio activity to conserve energy in addition to the traditional functions. This thesis presents advanced research work …
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DMACS: a media access protocol for single-hop wavelength division multiplexed lightwave networks
This thesis proposes a new media access protocol for local area and metropolitan area all-optical networks employing wavelength division multiplexing (WDM). Through WDM, multiple channels are created on a single fiber, and an aggregate network bandwidth far greater than the peak electronic …
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Hardware implementation of wireless bit rate adaptation
… requires changes to both the physical and media access control layers. which precludes using existing commodity 802.11 hardware. This project developed a SoftRate implementation on top of Airblue, an FPGA platform for developing wireless protocols. We present a hardware implementation of …
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A dynamic and robust random multiple-access scheme for communication over satellite channels with interference
… future traffic demands and a random multiple-access mode that can dynamically adapt to user traffic, as well as the number of users, will be required for future systems. Given that military operations often take place in contested environments, future systems must also be able to operate in …
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Characterizing Dynamic Power and Data Rate Policies for WirelessUSB Networks
… on battery life. Power can be conserved at the Media Access Control (MAC) layer by intelligently adjusting transmission power level and data rate encoding. WirelessUSB is a low-power, low-latency wireless technology developed by Cypress Semiconductor Corporation for human interface devices such …
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A quality of service architecture for WLAN-wired networks to enhance multimedia support
The use of WLAN for the provision of IP multimedia services faces a number of challenges which include quality of service (QoS). Because WLAN users access multimedia services usually over a wired backbone, attention must be paid to QoS over the integrated WLAN-wired network. This research focuses …
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Medium access delay evaluation for distributed queueing dual bus (DQDB) MAC protocol
Distributed Queuing Dual Bus (DQDB) is a media access control (MAC) technique, which is being considered by the IEEE 802.6 for the metropolitan area network (MAN). The DQDB medium access technique has many promising advantages over other access methods. However it has one drawback, which is its …
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Hybrid FPGA and GPP Implementation of IEEE 802.15.4 Physical Layer
… performed on the FPGA, while less complex MAC (Media Access Control) layer tasks are performed in GNU Radio on the host. The second case is an implementation of a multi-channel IEEE 802.15.4 receiver. A four-channel channelizer is implemented on the external Virtex 5 FPGA, while the IEEE …
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An Application of Bluetooth Technology to Rural Freeway Speed Data Collection
… a Bluetooth device capable of recording the media access control (MAC) addresses of target radios on Interstate 71 and calculating the resulting space mean speed. Based on the development of these Bluetooth devices, recommendations including node spacing configurations are developed for urban …
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Underwater acoustic communications and adaptive signal processing
… computer simulations on both Physical (PHY) and Media access control (MAC) layers. The ocean experimental results show that without channel equalization, the full tail-biting convolution (FTBC) codes with short packet lengths not only can perform similarly to zero-tailing convolution (ZTC) codes …
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Privacy and Security in IPv6 Addressing
… an address using a static value derived from the Media Access Control (MAC) address of a network interface as host portion, or interface identifier (IID). The Dynamic Host Configuration Protocol version 6 (DHCPv6) uses a client-server model to manage network addresses, providing stateful address …
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Bluetooth Low Energy Based CoAP Communication in IoT CoAPNonIP: An Architecture Grants CoAP in Wireless Personal Area Network
… Bluetooth Low Energy (BLE) devices use the Media Access Control (MAC) address as an identifier and use Generic Attribute Profile (GATT) to transfer data. Therefore, how to overcome those barriers is an important topic. There are several approaches to overcome those barriers. For example, a …
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Optimum Design of Spectral Efficient Green Wireless Communications
… has been developed to achieve collision-tolerant media access control (CT-MAC) in a wireless network. The proposed frequency domain OOAT scheme can improve the SE and EE by allowing multiple users to transmit simultaneously over the same frequency bands, and the signal collisions at the receiver …
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Link adaption with limited feedback for future wireless networks
… transmission on the uplink, can a more efficient media access control scheme for CSI reporting be developed?
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Metropolitan Area Network architecture design for Optical Flow switching
… MAN architectures are coupled intimately with media access control protocol designs and must be optimized jointly. Two routing architectures that represent extreme cases were proposed and examined: Quasi-Static Architecture (QSA) and Dynamic Per Flow Routing Architecture (DPFRA). The …
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Protocol stacks for power-aware wireless microsensor networks
… power aware features in the link layer and media access control (MAC) layer promises to extend the lifetime of the sensor network. The power-aware design will be illustrated on [mu]AMPS sensor node prototypes. With the integrated design framework, lower layers of the network stack provides …
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An Energy Aware and Secure MAC Protocol for Tackling Denial of Sleep Attacks in Wireless Sensor Networks
… exploring duty cycling and simulating three Media Access Control ( protocols Sensor MAC, Timeout MAC andTunableMAC under different network sizes and measuring different parameters such as the Received Signal Strength RSSI) and Link Quality Indicator ( Transmit power, throughput and energy …
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