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 24 for “"distributed coordination"”.
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Distributed coordination in network information theory
… very little about efficient communication in a distributed environment. In distributed wireless networks, there appears to be an interesting and complex trade-off between trying to take advantage of independent noisy signals at different relays and closely coordinating relay transmissions to a …
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Enhanced Collision Resolution for the IEEE 802.11 Distributed Coordination Function
The IEEE 802.11 standard relies on the Distributed Coordination Function (DCF) as the fundamental medium access control method. DCF uses the Binary Exponential Backoff (BEB) algorithm to regulate channel access. The backoff period determined by BEB depends on a contention window (CW) whose size is …
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Separation of distributed coordination and control for programming reliable robotics
Made available in DSpace on 2020-10-07T20:59:55Z (GMT). No. of bitstreams: 2 GHOSH-DISSERTATION-2020.pdf: 5711274 bytes, checksum: 60801584e32a9632d4bd7bfd1743e6c5 (MD5) LICENSE.txt: 4210 bytes, checksum: f2dc51ebbf42efab5e722f4638193a7a (MD5) Previous issue date: 2020-07-16
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Distributed coordination and control experiments on a multi-UAV testbed
(cont.) of environmental disturbances and measurement noise.The product of this thesis is a robust planning system that is tolerant of the types of uncertainty experienced by real aircraft. This robustness has been demonstrated by more than 20 successful flights on a fully automated UAV testbed.
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Safe distributed coordination of heterogeneous robots through dynamic simple temporal networks
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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Distributed coordination of autonomous agents by communicating on a need-to-know basis
Intelligent autonomous agents working cooperatively accomplish tasks more efficiently than single agents, as well as tasks that were infeasible for the single agent. For example, a single agent transporting a ton of blocks will need to take multiple trips, possibly even more trips than it can make, …
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Performance analysis of relay based cooperative MAC protocols
… we propose an Enhanced relay-enabled Distributed Coordination Function (ErDCF), which uses high data rate nodes to work as relays for the low data rate nodes. ErDCF in saturation achieves higher throughput, lower delay and lower energy consumption as compared to conventional 802.11 …
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Reconfiguration control in adaptive networks
… algorithm was implemented, two algorithms for distributed coordination and collision avoidance, respectively.
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A new localized approach to distributed fair scheduling in multihop wireless networks
… reuse of channels, and desire to achieve fully distributed scheduling in the wireless communication systems. This thesis presents a localized and fully distributed algorithm with fair scheduling in multihop wireless networks. The proposed algorithm incorporates start time fair queuing (STFQ) …
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Passivity Methods for the Stabilization of Closed Sets in Nonlinear Control Systems
… developed in this thesis are used to solve a distributed coordination problem for a group of unicycles, whereby the vehicles are required to converge to a circular formation of desired radius, with a specific ordering and spacing on the circle.
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Safe Control and Coordination of Multiple Autonomous Vehicles
… of model predictive control techniques for the distributed control and safe coordination of autonomous vehicles, specially those with nonholonomic dynamic models. We consider in particular the problem of safe trajectory tracking for a group of interacting autonomous nonholonomic vehicles. In …
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A hardware testbed for measuring IEEE 802.11g DCF performance
The Distributed Coordination Function (DCF) is the oldest and most widely-used IEEE 802.11 contention-based channel access control protocol. DCF adds a significant amount of overhead in the form of preambles, frame headers, randomised binary exponential back-off and inter-frame spaces. Having …
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Design of Media Access Control Schemes for Performance Enhancement of Future Generation Wireless Systems
… 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 major roles of MAC protocols are examined: maximizing network throughput and service …
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Performance of voice and data transmission using the IEEE 802.11 MAC Protocol
… Avoidance (CSMA/CA) protocol called the Distributed Coordination Function (DCF). The MAC protocol also includes an optional polling scheme called the Point Coordination Function (PCF) to deliver near-isochronous service to stations. This thesis analyzes the performance of these two medium …
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The Environment Constrains Successful Search Strategies in Natural Distributed Systems
… investigates two natural systems that use distributed search algorithms and tests the hypothesis that the searchers' environment is a key constraint on an optimal algorithm. Natural instances of distributed autonomous systems of simple components exist in both biology and social systems. …
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Distributed time-critical coordination strategies for unmanned aerial systems in cluttered environments
… environments, subject to a broad range of coordination and temporal constraints. The proposed solution expands the type of time-critical missions that can be automated using cooperative motion control frameworks. This work introduces the use of novel geometric queries to aid a sample-based …
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Physics-Aware Optimization and Data-Driven Methods for Low-Carbon Power Systems
… of integer constraints? How do we coordinate distributed grid-edge devices across multiple timescales and ownership boundaries? How do we develop and evaluate algorithms without access to real-world data? To address these questions this thesis proposes two physics-aware optimization frameworks …
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Power Management and Control Strategies in Hybrid AC/DC Microgrids
… an improved power management and control coordination strategy for an autonomous HMG. The HMG considered in this part consists of multiple AC and DC sub-microgrids (SMGs) with different voltage levels. The hierarchical coordination of power management and control strategy for the …
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Optimization Methods for Distribution Systems: Market Design and Resiliency Enhancement
… storage systems (ESS), microgrids (MG), and distributed energy resources (DER), can be leveraged to restore critical load in the system when the utility system is not available for extended periods of time. Critical load restoration is a key factor to achieve a resilient distribution system. …
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Cross-layer optimizations in multi-hop ad hoc networks
… the clustering scheme could support MAC layer coordination among nodes, by shifting the distributed MAC paradigm towards a pseudo-centralized MAC paradigm. On the other hand, the system benefits of the clustering scheme could be emphasized by the pseudo-centralized MAC layer with the support …
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