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 550 for “"Mac"”.
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Zero-error communication over adder MAC
Adder MAC is a simple noiseless multiple-access channel (MAC), where if users send messages X₁, . . . ,X[subscript h] [epsilon] {0, 1}[superscript n], then the receiver receives Y = X₁ + · · · + X[subscript h] with addition over Z. Communication over the noiseless adder MAC has been studied for …
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Movable frame hybrid MAC : a multi-MAC protocol for wireless software radios in multi-rate multimedia applications
We describe a new medium-access control (MAC) protocol for dynamic adjustment of the bandwidth requirement of multimedia applications. The purpose of this technique is handling multi-rate, multi-level traffic in an integrated wireless-access network (IWAN). A proposed mechanism divide total …
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MAC architecture for broadband satellite access systems
… rather longer delays and bounded resources, a MAC layer that can efficiently share resources over a minimum possible bandwidth is mandatory to the success of satellite access. Existing MAC protocols are not able to achieve optimum performance. Hence, design of a new MAC becomes inevitable. The …
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Energy-efficient Wireless Sensor Network MAC Protocol
… energy-efficient medium access control (MAC) protocols designed to extend both the lifetime and range of wireless sensor networks. These networks are deployed in remote locations with limited processor capabilities, memory capacities, and battery supplies. The purpose of this research is …
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Σύγκριση της αποτελεσματικότητας των βιντεολαρυγγοσκοπίων C-MAC και McGrath MAC στη διασωλήνωση διάφορων ομάδων ασθενών - Συστηματική ανασκόπηση και μετα-ανάλυση
… και υγείας των ασθενών. Δύο εξ’ αυτών, το C-MAC και το McGrath βιντεολαρυγγοσκόπιο, έχουν συγκριθεί σε αρκετές μελέτες τόσο μεταξύ τους όσο και με άλλα βιντεολαρυγγοσκόπια, προκειμένου να βγουν στατιστικά σημαντικά συμπεράσματα ως προς την αποτελεσματικότητά του καθενός. Σκοπός της παρούσας …
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Performance analysis of relay based cooperative MAC protocols
… The focus of this research is on the relay based MAC layer: design of cooperative MAC protocols, performance modelling, and protocol enhancements. The first contribution of this thesis is dedicated to the modelling of energy consumption which aids MAC protocol developers in the design phase to …
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MAC AND APPLICATION LAYER PROTOCOLS FOR HIGH PERFORMANCE NETWORKING
… issue looks at the Medium Access Control (MAC) layer of the OSI network model for designing of MAC protocols that provide low-latency and high reliability for point-to-point communication under a WSN. Existing standards in this area are governed by IEEE 802.15.4 specification which defines …
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Security threats to the MAC-layer in wireless networks
Medium access control (MAC) protocol security is important in wireless networks due to the lack of physical access control that normally exists in wired networks in the form of connecting a cable. Most efforts in standards organizations and academic research focus on the requirements of …
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MAC and Physical Layer Design for Ultra-Wideband Communications
… operating users has been investigated. Current MAC design for UWB has relied heavily on existing MAC architectures in order to maintain backward compatibility. It remains to be seen if the existing MACs adequately support the UWB PHY (Physical) layer for the applications envisioned for UWB. …
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MAC layer resource allocation algorithms for OFDM/TDMA wireless networks
In wireless networks employing OFDMA/TDMA, orthogonal channels and timeslots are available resources that should be distributed between users fairly and in a collision-free manner. Furthermore, the available resources should be used efficiently. In this dissertation, the resource allocation …
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Improving the scalability of MAC protocols in wireless mesh network
… is critical for the success of multi-channel MACprotocols. Unfortunately, current multi-channel MAC protocols are not efficient in the utilization of the multiple channels. The poor utilization of the available channels is also affected by the following: channel coordination, channel …
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MAC protocol design considerations for efficient mobility in wireless sensor networks
… in the standard medium access control (MAC) protocol for WSNs when applied to mobile sensor networks. Mobile nodes in MSN consume more energy due to more overhead messages, experiencing longer disconnectivity periods each time the mobile nodes enter a new coverage range, having …
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Wideband Autonomous Cognitive Radios: Spectrum Awareness and PHY/MAC Decision Making
… layer and medium access control layer (PHY/MAC) decision-making for wideband bandwidth aggregation (simultaneous operation over multiple modes/networks); and 4) autonomous spectrum sensing scheduling solutions in an alien ultra wideband RF environment. The major contribution of this …
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MAC Layer DATA/ACK Handshake in the Hybrid VLC-RF System
… the two links without any modi cation in the MAC layer would cause problems for the MAC layer DATA/ACK handshake. The acknowledgements for VLC packets have to be transmitted via ra- dio. Because of the Wi-Fi channel's contention based random access, the transmission will be delayed and …
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Cooperative communications in wireless networks : novel approaches in the mac layer
… problem in the medium access control (MAC) layer are proposed. The novelty of this thesis is two-fold. We first investigate the problem of cooperative communication in a special type of wireless networks, namely ultra wide-band (UWB) networks, for the first time in the literature. The …
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Somhairle Mac Gill-Éain agus Seán Ó Ríordáin Friotal, Creideamh, Moráltacht.
… céanna atà faoi chaibidil ag Somhairle Mac Gill-Éain ina chuid filiochta ach go bhfuil siad ar siul, ni i gcroi an duine ach ar dhromchla an domhain. Is filiocht phoibli cuid mhór dà shaothar agus fiu ina chuid filiochta grà, briseann an condition humaine isteach ar a choimhneas …
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Cluster based jamming and countermeasures for wireless sensor network MAC protocols
… energy. The medium access control layer (MAC layer) directly guides the radio hardware and manages access to the radio spectrum in controlled way. A top priority for a WSN MAC protocol is to conserve energy, however tailoring the algorithm for this purpose can create or expose a number of …
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