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 31 for “"rate adaptation"”.
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Hardware implementation of wireless bit rate adaptation
… presents a hardware implementation of the SoftRate bit-rate adaptation protocol. SoftRate is a new bit-rate adaptation protocol, which uses per-bit confidence hints generated by the convolutional decoder to estimate the channel bit-error rate. Implementing SoftRate requires changes to both the …
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A Solution to optimal and fair rate adaptation in wireless mesh networks
… of two sections. The rst section nds the optimal rate allocation, by making use of a heuristic. The heuristic was developed by means of a non-linear mixed integer mathematical formulation. This heuristic nds a feasible rate region that conforms to the set of constraints set forth by the wireless …
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Quality of Experience Enhancement Architecture For Video Delivery On WiFi
… and coding scheme (MCS) selected by the rate adaptation algorithm for WiFi is restricted to combinations which are more robust against these impairments. To improve the QoE served to a user, this research pursues two main approaches: (1) Evaluate methods of estimating QoE for streaming …
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Greediness control algorithm for multimedia streaming in wireless local area networks
… a result of the streaming processes reliance on rate adaptation engines based on congestion avoidance mechanisms, that try to obtain as much bandwidth as possible from the limited network resources. These upper transport layer mechanisms have no knowledge of the media which they are carrying and …
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Analysis and Cross -Layer Design of Medium Access and Scheduling in Wireless Mesh Networks
… resource allocation scheme that incorporates PHY layer power control and rate adaptation, and is aware of power constraints.
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Improving wireless network performance using sensor hints
… we show how access points can perform better rate adaptation by changing strategies when they receive hints about a client's mobility. Second, we show how probing protocols for topology maintenance in mesh networks can increase both their efficiency and accuracy by adaptively probing based on …
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RFID as a key enabler of the internet of things : localization and communication
… lack functionalities like carrier sense and rate adaptation, and hence RFID-sensor networks tend to suffer from collisions and inefficient data communication. In this dissertation, instead of considering collision as detrimental and trying to avoid it, we show how to transform collisions into …
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Provider-Controlled Bandwidth Management for HTTP-based Video Delivery
… as a platform for investigating different rate adaptation schemes and algorithms. We then concentrated on evaluating the network impact of multiple adaptive bitrate clients competing for limited network resources, and developing schemes for enforcing fair access to network …
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Physical layer-aware wireless link layer protocols
… to dynamically adapt their transmit bit rate. The broadcast nature 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 …
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Learning-Based Interference Mitigation for Wireless Networks
… aspects: (1) collision avoidance, (2) channel rate adaptation, and (3) spatial reuse.
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Supporting delay guarantees over unreliable wireless channels
… also address fading channels and the usage of rate adaptation. Based on this model, we obtain solutions for three important mechanisms: admission control, packet scheduling, and utility maximization. In addition, we address the scenario of broadcasting flows with delay constraints and …
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Integrating spinal codes into wireless systems
Rateless spinal codes [47] promise performance gains for future wireless systems. These gains can be realized in the form of higher data rates, longer operational ranges, reduced power consumption, and greater reliability. This is due in part to the manner in which rateless codes exploit the …
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Design and Implementation of a MAC protocol for Wireless Distributed Computing
… ensuring reliable data transfer, incorporating rate adaptation as well as handling link failures. The thesis presented here elaborates the design and implementation of such a MAC protocol for WDC employed in a practical network of radio devices configurable through software. It also brings to …
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Performance analysis of diversity techniques in wireless communication systems: Cooperative systems with CCI and MIMO-OFDM systems
… the performance analysis includes the bit error rate (BER) of dier- ent binary and M-ary modulation schemes, and the average channel capacity (ACC) under dierent adaptive transmission protocols, namely, the simultaneous power and rate adaptation protocol (OPRA), the optimal rate with xed power …
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Modeling and adaptive control of indoor unmanned aerial vehicles
… test results using a quadrotor helicopter demonstrate that designer specifications correspond to the expected physical responses. Multi-input multi-output (MIMO) L1 adaptive control is applied to a three-wing tailsitter. An inner-loop body rate adaptation structure is used to bypass the …
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A Simulator for analyzing the throughput of IEEE 802.11b Wireless LAN Systems
Wireless Local Area Networks (WLAN) have proliferated in the last 5 years. The IEEE 802.11b products have become commonplace both in the residential and business places for untethered Internet access. However the end user experience has often been less satisfactory than what the technology can …
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Human action recognition with 3D convolutional neural networks
… classification. Recently, CNNs have been demonstrated to provide superior performance across numerous image classification databases including large natural images (Krizhevsky et al., 2012). Furthermore, CNNs are more readily transferable between different image classification problems when …
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Measurement and analysis of real-world 802.11 mesh networks
… topics, including the accuracy of SNR-based bit rate adaptation, the impact of opportunistic routing, and the prevalence of hidden terminals. The size and diversity of our data set allow us to analyze claims previously only made in small-scale studies. In particular, we find that the SNR of a …
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System identification and modeling of primary electrosensory afferent response dynamics in the weakly electric fish Apteronotus leptorhynchus
… stimuli, we find that the time course of firing rate adaptation in P-type afferents can be approximated by one or two exponentially decaying components plus a tonic component. If the duration of the step stimulus is prolonged, however, the apparent tonic component of the response continues to …
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Airblue : a highly-configurable FPGA-based platform for wireless network research
… able to achieve reliable communication for bit rates up to 24 Mbps. We show in the thesis that we can implement SoftRate, a cross-layer rate adaptation protocol, by modifying only 5.6% of the source code (967 lines). We also show that our modular design approach allows us to abstract the details …
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