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 23 for “"control channel"”.
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Adaptive and autonomous protocol for spectrum identification and coordination in ad hoc cognitive radio network
… to achieve interference free communication channel. In a CR system, Dynamic Spectrum Access (DSA) is made feasible. CR has been proposed as a candidate solution to the challenge of spectrum scarcity. CR works to solve this challenge by providing DSA to unlicensed (secondary) users. The …
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Paving the Path of LTE Toward 5G: Physical Layer Assurance and Operation in the Unlicensed Spectrum
… at the physical layer. We define the term LTE control channel spoofing, which refers to the case when an adversary sets a fake LTE-like base station (evolved NodeB or eNodeB) that transmits a partial or full LTE downlink frame to deceive LTE devices and hinder them from attaching to a real …
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DMACS: a media access protocol for single-hop wavelength division multiplexed lightwave networks
… multiplexing (WDM). Through WDM, multiple channels are created on a single fiber, and an aggregate network bandwidth far greater than the peak electronic processing speed can be realized. The new protocol, Dynamic Media Access Control Scheme (DMACS), is based on the Dynamic Interleaved …
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Detour : Los Angeles River Speed Cinema
… of driving and movie-watching in the Flood Control Channel in downtown Los Angeles.
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Securing Wireless Broadcast Communications against Internal Attacks
… of the adversary to deny access to the broadcast channel. We introduce a randomized distributed scheme that allows nodes to establish and maintain the broadcast channel in the presence of the jammer. Also this scheme uniquely identifies the set of compromised nodes, both when nodes are acting …
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Field container as a regional strategy for revitalizing the Los Angeles River
… currently a mono-functioning, concretized flood control channel, to become a multi-functioning infrastructure mediating a density of program and flows at the regional, metropolitan and local scales.
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Distance-1 constrained channel assignment in single radio wireless mesh networks
This thesis addresses channel assignment and random medium access design for single-radio multi-channel mesh networks. Two prior approaches include: (i) designing MAC protocols that dynamically select channels based on local information and (ii) partitioning the mesh into subnetworks with different …
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On the Scalability of Ad Hoc Dynamic Spectrum Access Networks
… with one transceiver per node and a dedicated control channel. We also develop and integrate a detailed model for energy detection in Poisson networks with sensing. We observe that the network capacity scales sub-linearly with the number of DSA users and the end-to-end throughput diminishes, …
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Analytical investigation of active control of radiated inlet noise from turbofan engines
… developed to study the potential of active noise control techniques for reducing radiated tonal inlet noise from turbofan engines. The analytical model consists of multiple control sources placed in the periphery of the engine inlet duct which inject anti-noise into the duct to destructively …
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Safe and adaptive reinforcement learning for robotics applications
In recent years, learning-based control methods, especially those leveraging the power of reinforcement learning (RL) and deep learning, have demonstrated impressive performance in complex robotics control tasks. However, they often suffer from the lack of safety and robustness guarantees, which …
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Performance Analysis of Network Coding Techniques and Resource Allocation Algorithms in Multiuser Wireless Systems
… is a quantitative analysis of the effects of channel estimation errors and time synchronization errors on the performance of different network coding algorithms. It is shown that the performance improvement gained by a relay-based network scheme is significant for small number of users and …
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Resource Allocation and Adaptive Antennas in Cellular Communications
… improvement can be achieved by reducing co-channel interference. Several techniques have been proposed in literature for mitigating co-channel interference, such as adaptive antennas and power control. Also, by allocating transmitter power and communication channels efficiently (resource …
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Enhancing Attack Resilience in Cognitive Radio Networks
… sensing data falsification (SSDF) attack, and control channel jamming (CCJ) attack. These attacks can wreak havoc to the normal operation of CR networks. After identifying and analyzing the attacks, we discuss countermeasures. For PUE attacks, we propose a transmitter verification scheme for …
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Medium Access Control in Cognitive Radio Networks
… bands, and secondary users must vacate the channel where incumbent user signals are detected. A CR network is composed of secondary users equipped with CRs and it can coexist with incumbent users in licensed bands under the OSS paradigm. The coexistence between incumbent users and secondary …
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Active Minimization of Acoustic Energy Density in a Mock Tractor Cab
<p>An active noise control (ANC) system has been applied to the problem of attenuating low-frequency tonal noise inside small enclosures. The intended target application of the system was the reduction of the engine firing frequency inside heavy equipment cabins. The ANC system was based on a …
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A new location-based service architecture with efficient transmission method using control channels
… to use the spare extension of the random access channel (RACH), which is carried by the physical random access channel (PRACH) for the uplink to send the user request to the core network. Then, the spare extension of the forward access channel (FACH) will be used, which is carried by secondary …
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Protocols for multi-antenna ad-hoc wireless networking in interference environments
… The key idea behind the STI-MAC protocol is 'channel stuffing,' that is, allowing network nodes to more efficiently use spatial, time and frequency degrees of freedom. This is achieved in three key ways. First, 'channel stuffing' is achieved through multiple antennas that are used at the …
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A Proactive Routing Protocol for Multi-Channel Wireless Ad-hoc Networks
… (NICs) has made the IEEE 802.11 medium access control (MAC) protocol the de facto MAC protocol for wireless mobile ad-hoc net-works, even though it is not optimal. The IEEE 802.11 MAC protocol is designed to have stations share a single channel in a given network. However, many of the IEEE …
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Prominent Platforms for the Synthesis of Size-Controllable Polymeric Nanoparticles for Gene Delivery
… over traditional methods, such as precise control of targeted genes, high efficiency at low dosage, and minimal side effects. However, protecting the integrity of genetic materials during delivery poses a critical challenge. The polymeric nanoparticles (PNPs), as an appealing approach for …
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Augmenting L1 Adaptive Control of Piecewise Constant Type to Aerial Vehicles
In aerial vehicle control design, the industrial baseline is to use robust control methods together with gain-scheduling to cover the full airspeed and altitude flight envelope. An adaptive controller could possibly add value by increasing performance while keeping robustness to deviation from …
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