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 63 for “"Retransmission"”.
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Retransmission strategies for moving networks over ricean fading channels
The problem of designing retransmission protocols based on Hybrid Automatic Repeat reQuest (HARQ) for moving networks over Ricean fading channels has been considered. The scenario of interest consists of one receiver traveling at a given speed while connected to a wireless network based on OFDM …
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SCTP Performance Improvement Based on Adaptive Retransmission Time-Out Adjustment
… of improving SCTP's performance via fine tuning Retransmission Time-Out (RTO) algorithm that estimates the time between nodes.
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Cooperative retransmission protocols in fading channels : issues, solutions and applications
… antenna technology. On this line, cooperative retransmission protocols are considered as particularly promising technology due to their opportunistic and flexible exploitation of both spatial and time diversity. In this dissertation, some of the major issues that hinder the practical …
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Verification and implementation of a multiple retransmission technique for a one-way asynchronous communication channel
… and the implementation of a multiple retransmission technique for the one-way asynchronous communication channel of the Interactive Video Data Service (IVDS) system. The commercial application of the IVDS project made reliability of the retransmission technique important. Verification …
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Formally modeling, analyzing, and designing network protocols : a case study on retransmission-based reliable multicast protocols
… on formally modeling, analyzing, and designing retransmission-based reliable multicast protocols. We first present an abstract model of the communication service that several reliable multicast protocols [12, 13, 32-34] strive to provide. This model precisely specifies i) what it means to be a …
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Benefits of opportunistic routing, implicit acknowledgments, and network coding on a linear broadcast network
… as metrics. The protocols studied use end-to-end retransmission, end-to-end coding, and link-by-link retransmission with network coding both with and without opportunistic routing. Simulation and analytical results are presented. End-to-end coding significantly outperforms end-to-end …
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Dynamic Cooperative Communications in Wireless Ad-Hoc Networks
… dissertation. First, an efficient cooperative retransmission scheme is introduced to increase bandwidth efficiency by reducing wasteful cooperating signals. The proposed cooperative transmission method does not require any additional information for cooperation. Furthermore, we ensure good …
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New hybrid automatic repeat request (HARQ) combining with space time block coding (STBC) in invariant and variant fading channel
… channel matrix, the receiver chooses the best retransmission order and communicated it to the transmitter. The scheme, where this algorithm is performed, is a combination of a precombining HARQ scheme and the Multiple Alamouti Space-Time Block Coding (MASTBC), which is suitable for more than 2 …
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Enabling decentralized wireless index coding in practice
… applied to an OFDMA downlink network during the retransmission phase. An orthogonal frequency-division multiple access (OFDMA) downlink network is a network where data is sent downward from a designated higher-level transmitter to a group of receiving nodes. In addition, receivers can often …
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Transport layer protocol design over flow-switched data networks
… forward error-correction (FEC), and frame retransmission. We analyze the throughput and delay performance of four example transport layer protocols: the Simple Transport Protocol (STP), the Simple Transport Protocol with Interleaving (STPI), the Transport Protocol with Framing (TPF) and the …
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Link layer protocol performance of indoor infrared wireless communications
… minimizing CA delays. AIr implements a Go-Back-N retransmission scheme at high or low level to cope with transmission errors. AIr optionally implements a Stop-and-Wait retransmission scheme to efficiently implement RR coding. Analytical models for the AIr retransmission schemes are developed and …
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Improving TCP performance over heterogeneous networks : The investigation and design of End to End techniques for improving TCP performance for transmission errors over heterogeneous data networks.
… with drops: congestion window update mechanism, retransmission mechanism and timeout mechanism. All of these mechanisms are part of the TCP congestion control mechanism. We propose changes to each of these mechanisms in order to allow TCP to cope with transmission errors. We propose a new TCP …
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The SoftPHY abstraction : from packets to symbols in wireless network design
… one of which, more efficient link-layer retransmissions, we will describe in detail. PP-ARQ is a link-layer reliable retransmission protocol that allows a receiver to compactly encode a request for retransmission of only the bits in a packet that are likely in error. Our experimental …
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Repeater Unit Software Development in Wireless Interactive Video Data Service System
… forwarded messages, scheduling messages for retransmission based on message priority, and retransmission using the point-to-point protocol (PPP) using a dial-up modem connection. In order to achieve better performance the existing software kernel was re-written in some sections. This thesis …
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Actors, Partisan Inclination, and Emotions: An Analysis of Government Shutdown News Stories Shared on Twitter During Dec 2018 and Jan 2019
… important element in the reception and retransmission of online information. Because of existing divergence in ideology, both in the audience and producer of news stories, political issues are prone to spark a lot of emotional contents online. This present study takes the 2018-2019 …
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Relay Selection Strategies for Multi-hop Cooperative Networks
… (SNR) link to the next hop is then selected for retransmission. We analyze the performance of this method in terms of end-to-end outage probability, and we derive approximations for the ergodic capacity and the effective ergodic capacity of this strategy. Next we propose a novel hop-by-hop relay …
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ARQ Techniques for MIMO Communication Systems
… for MIMO communication systems. The basic retransmission protocols of ARQ, stop-and-wait (SW-ARQ), go-back-$N$ (GBN-ARQ), and selective repeat (SR-ARQ), designed for SISO communication systems are generalized for parallel multichannel communication systems. The generalized ARQ protocols …
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Effects of loss rate on ad hoc wireless routing
… protocols from using the links. Link-level retransmission can mask high loss rates, at the cost of substantial decreases in throughput. Simulations, driven by the observed loss rates, show that the shortest paths chosen by existing routing protocols tend to find routes with much less …
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Congestion-resilient TCP
… any single packet loss without the need for retransmission. Furthermore, in the unlikely best case, up to a third of the TCP stream can be lost without the need for retransmissions. We test our scheme against FreeBSD's default NewReno implementation with and without Selective Acknowledgment …
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