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 33 for “"Jammer"”.
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Control in the presence of an intelligent jammer with limited actions
… in the presence of an intelligent and strategic jammer who is maliciously altering the control signal or observation signal in the communication network connecting the controller and the plant. The first formulation considers a dynamic zero-sum game between a controller and a jammer for two …
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The Design, Testing, and Analysis of a Constant Jammer for the Bluetooth Low Energy (BLE) Wireless Communication Protocol
… pandemic, necessary adjustments were made to the jammer system design. In the first modified jamming scheme, a single synthesizer evaluation board, power amplifier, and antenna, are used to transmit jamming tones in the form of a frequency hop. Limitations of the frequency hop approach …
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The Design, Building, and Testing of a Constant on Discreet Jammer for the IEEE 802.15.4/ZIGBEE Wireless Communication Protocol
<p>As wireless protocols become easier to implement, more products come with wireless connectivity. This latest push for wireless connectivity has left a gap in the development of the security and the reliability of some protocols. These wireless protocols can be used in the growing field of IoT …
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Antifragile Communications
… we investigate the previously unexplored area of jammer exploitation. This dissertation develops the concept of antifragile communications, defined as the capability for a communications system to improve in performance due to a system stressor or harsh condition. Antifragility refers to systems …
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Cognitive Security Framework For Heterogeneous Sensor Network Using Swarm Intelligence
… attack using Bayesian models. The jammer attack is considered the most vulnerable attack, and therefore simulated vehicular ad-hoc network is experimented with varied types of jammer. Classification of the jammer under various attack scenarios is formulated to predict the …
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On the Design and Analysis of Secure Inference Networks
… jamming attacks in detection networks where the jammer distributes its power across the sensing and the communication channels. We also model the interaction between the jammer and a centralized detection network as a complete information zero-sum game. We find closed-form expressions for …
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Use of Reinforcement Learning for Interference Avoidance or Efficient Jamming in Wireless Communications
… to avoid interference and potential malicious jammers. To that effect, we implement a reinforcement learning algorithm called contextual bandits. The harsh environment of an underwater channel provides a challenging problem. The channel may induce multipath and time delays which lead to …
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Time-Varying Autoregressive Model Based Signal Processing with Applications to Interference Rejection in Spread Spectrum Communications
… of an interference - which could be a hostile jammer or overlaid communication signal - possibly exceeds the inherent spread spectrum processing gain, interference rejection is necessary to secure a usable bit-error-rate. The contributions of this research include: a) revealed the advantageous …
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Inaudible acoustics: Techniques and applications
… contacts. Our prototypes include an inaudible jammer that secures private conversations from electronic eavesdropping, acoustic beacons for location-based information sharing, and vibratory communication in a smart-ring sending password through a finger touch. Our research also uncovers new …
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Perspectives of Jamming, Mitigation and Pattern Adaptation of OFDM Pilot Signals for the Evolution of Wireless Networks
… receiver in the presence of a multi-tone pilot jammer. We develop and evaluate mitigation algorithms to mitigate power constrained multi-tone pilot jammers in SISO- and full rank spatial multiplexing MIMO-OFDM systems. Our results show that the channel estimation performance can be restored even …
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Beyond band : perspectives on the high school jam session
… including 21 who fully met stated criteria for jammers, and 13 non-jamming subjects, were studied over a period of four months. The general research question was: Does participation in a band room jam session benefit students cognitively and motivationally? Specific research questions were: Do …
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Analysis of Jamming-Vulnerabilities of Modern Multi-carrier Communication Systems
… of the two transceivers and the CSI between the jammer and the target play critical roles in ensuring the effectiveness of jamming and nulling attacks. Although current literature is rich with different channel estimation techniques between two legitimate transceivers, it does not have much to …
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Social defense mechanisms : tools for reclaiming our personal space
… is in view. The second is low- power RF jammer capable of preventing cell phones or similarly intrusive wireless devices from operating within a user's personal space. By building functional prototypes that reflect equal consideration of technical and social issues, I identify three …
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Practice to pitch: The relationship between force-velocity profiles and match-day performance of semi-professional rugby union players
… exercises (sled push, sled pull, back squat and jammer push-press) at incremental loads to establish FVPs. Rugby performance indicators (post-contact metres, tries, turnovers conceded, tackles, try assists, metres run, tackle-breaks and defenders beaten) were collected over nine weeks of a …
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Collision study for the one-way IVDS channel
… using two similar transmitters, one acting a the jammer, to test the collision dynamics of each receiver. Packet data from both transmitters contain identical spreading codes. Data from the testing is analyzed and the receivers' jamming margin, capture, and process gain qualities are compared as …
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Requirements for keyless jamming mitigation
… particular, we develop the model of a reactive jammer, parameterize it with varying levels of ability, and use this model to analyze three proposed keyless jamming mitigation techniques. We show that many of the uncoordinated spread spectrum schemes are infeasible for realistic computational …
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Data-driven Estimation of Low-Power Long-Range Signal Parameters by an Unauthenticated Agent using Software Radio
… to DoS attacks by designing an intelligent jammer that surpasses the need for prior knowledge of these parameters. Exploiting a structural pattern in LoRa signals, we propose a Neural Network (NN) implementation for jointly inferring the two parameters by eavesdropping. Through simulation …
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Resource Allocation for Interference Management in Wireless Networks
… One technique exploits time and structures a jammer mitigation framework through an automatic repeat request protocol. The other one utilizes power and, following a game-theoretic framework, employs a defense strategy against jamming based on a strategic power allocation. Superior performance …
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The location-estimating, null-steering (LENS) algorithm for adaptive microphone-array processing
… target source while attenuating non-target, jammer sources in a given environment. Although LENS is designed for general beamforming purposes, this document emphasizes the use of LENS to create a background-noise-reducing hearing aid. LENS processing is innovative in that it uses a novel …
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A Comparison Of Traditional Face-To-Face And Hybrid Pediatrics and Obstetrical Nursing Courses
Distance learning is rapidly spreading across various institutions as a main methodology in the delivery of curriculum. As schools of nursing are faced with mandates to increase enrollment to meet the demands of the nursing shortage with limited resources (financial and human capital) some …
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