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.
Results
Showing 1 to 20 of 27 for “"Access protocols"”.
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Multiple access protocols for multichannel communication systems
… thesis, we introduce the concept of multiple access communication and the need to use efficient transmission techniques to expand both present and future wireless communication networks. We will study two areas regarding multiple access on multichannel communication systems. First, we describe …
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Comparison of multiple access protocols for optical networks
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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Satellite multiple access protocols for land mobile terminals. A study of the multiple access environment for land mobile satellite terminals, including the design analysis and simulation of a suitable protocol and the evaluation of its performance in a U.K. system.
This thesis is a study of multiple access schemes for satellite land mobile systems that provide a domestic or regional service to a large number of small terminals. Three orbit options are studied, namely the geostationary, elliptical (Molniya) and inclined circular orbits. These are investigated …
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Performance of High-Speed Networks for Real-Time Applications
… thesis studies the performance of network medium-access protocols at high data transfer rates for real-time applications. In a real-time network, on-time delivery of messages is essential. We can ensure the timely completion of tasks only when we can predict the message transmission delay over the …
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Performance evaluation of multicomputer networks for real-time computing
… systems. FIFO, TDM, and token passing link access protocols and several queueing priorities are studied to measure their effect on the system’s performance. Finally, the contribution of the message parameters to the overall system delay is discussed. Existing analytic models are extended to …
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End-to-end scheduling to meet deadlines in distributed systems
… describe how to combine local or global resource access protocols and end-to-end scheduling. Finally, we show that by using end-to-end scheduling we can simplify resource access protocols and thus increase the utilization of resources.
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Clock Synchronization for Multihop Wireless Sensor Networks
… available, several applications such as media access protocols, object tracking, or data fusion, would improve their performance. In this dissertation, we propose a set of algorithms to achieve accurate time synchronization in large multihop wireless networks.
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Digital communication networks incorporating mobile data terminals
… with the use of contention random multiple access protocols, has led to a wide-spread application of these distributed access protocols in local area networks (LANs) and a further extension of them to radio and mobile radio communication applications. In this research, a proposal for a …
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Distributed Multiple Access for OFDMA Femtocells
… motivate the case of using distributed, random access protocols as apposed to centralized interference mitigation techniques in the context of LTE femtocells. For this, we employ queuing analysis to compare the performance of centralized resource allocation schemes represented by an ideal power …
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Physical layer-aware wireless link layer protocols
… of radio also necessitates the use of medium access protocols to arbitrate access among competing transmitters and reduce losses due to interference, while enabling successful concurrent transmissions. We observe that the problems with existing bit rate adaptation and medium access protocols …
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Utility Accrual Real-Time Scheduling: Models and Algorithms
… a class of lock-free and lock-based resource access protocols to satisfy mutual exclusion constraints. We show that satisfying utility lower bounds with lock-based resource access protocols does not imply doing so with the lock-free scheme, and vice versa. Finally, the dissertation presents a …
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Security in Smart Cities: Adapting Castalia to simulate sttacks on deployed heterogeneous WSNs
… of sensor networks by means of more robust access protocols and reliable anomaly detection algorithms. This work focuses on the necessary provisions taken to simulate existing node networks already deployed as part of the Barcelona's Smart City structure, using real data to construct …
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Partial DS-CDMA for mobile satellite data networks.
In recent years, random access protocols have received considerable attention as useful multiple access techniques for systems with high peak to average traffic ratios (bursty traffic). In most conventional random access protocols, when a single packet is transmitted in a given time period, it is …
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Effective Resource Allocation for Non-cooperative Spectrum Sharing
Spectrum access protocols have been proposed recently to provide flexible and efficient use of the available bandwidth. Game theory has been applied to the analysis of the problem to determine the most effective allocation of the users’ power over the bandwidth. However, prior analysis has focussed …
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Performance analysis of star architecture packet-switched VSAT networks using random code division multiple access
… is to provide a performance analysis of multiple access protocols in packet-switched Very Small Aperture Terminal (VSAT) satellite communication networks. This research consisted of three major thrusts. First, we analyzed the average time delay of the broadcast Time Division Multiplexing (TDM) …
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Clock Synchronization for Multihop Wireless Sensor Networks
… available, several applications such as media access protocols, object tracking, or data fusion, would improve their performance. In this dissertation, we propose a set of algorithms to achieve accurate time synchronization in large multihop wireless networks. First, we present a fully …
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Battery-Free Subsea Internet-of-Things
… self-interference cancellation, and multi-access protocols. Third, it shows how we can leverage our underwater backscatter nodes to enable a battery-free underwater GPS for localization and navigation. Finally, it demonstrates the feasibility of battery-free inference and machine learning …
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The Jade File System.
… System, which provides a uniform way to name and access files in the internet environment. Jade is a logical system that integrates a heterogeneous collection of existing file systems, where heterogeneous means that the underlying file systems support different file access protocols. Because of …
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Traffic-aware channel allocation and routing in multichannel, multi-radio wireless networks
… of rate-independent MAC overheads in random access protocols such as carrier sensing, backoff, and fixed rate header transmissions. These overheads become prominent in short packets that are transmitted at high data rates. We address this problem by partitioning the transmission spectrum into …
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Cross-layer design of random access wireless networks
… for wireless networks. Wireless medium access control (MAC) has to be specifically designed to resolve contention in the presence of interference. As a result, an important technique, the random access protocol, has emerged to address the contention issue. This protocol is the essential …
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