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Dissertations / Theses on the topic 'Physical layer of communication system'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Bloch, Matthieu. "Physical-layer security." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24658.

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Thesis (Ph.D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: McLaughlin, Steven; Committee Member: Barros, Joao; Committee Member: Bellissard, Jean; Committee Member: Fekri, Faramarz; Committee Member: Lanterman, Aaron

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2

Mostafa, Ayman. "Physical-layer security for visible-light communication systems." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61328.

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Visible-light communication (VLC) is an enabling technology that exploits the lighting infrastructure to provide ubiquitous indoor broadband coverage via high-speed short-range wireless communication links. On the other hand, physical-layer security has the potential to supplement conventional encryption methods with an additional secrecy measure that is provably unbreakable regardless of the computational power of the eavesdropper. The lack of wave-guiding transmission media in VLC channels makes the communication link inherently susceptible to eavesdropping by unauthorized users existing

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3

Xu, Ning. "Physical-Layer Network Coding for MIMO Systems." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc68065/.

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The future wireless communication systems are required to meet the growing demands of reliability, bandwidth capacity, and mobility. However, as corruptions such as fading effects, thermal noise, are present in the channel, the occurrence of errors is unavoidable. Motivated by this, the work in this dissertation attempts to improve the system performance by way of exploiting schemes which statistically reduce the error rate, and in turn boost the system throughput. The network can be studied using a simplified model, the two-way relay channel, where two parties exchange messages via the assist

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4

Ahmed, Alaa Hussain. "Physical layer network coding based communication systems in frequency selective channels." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3871.

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The demand for wireless communications is growing every day which requiresmore speed and bandwidth. In two way relay networks (TWRN), physical layer network coding (PLNC) was proposed to double the bandwidth. A TWRN is a system where two end users exchange data through a middle node called the relay. The two signals are allowed to be physically added before being broadcasted back to the end users. This system can work smoothly in flat fading channels, but can not be applied straightforward in frequency selective channels. In a multipath multi-tap FIR channel, the inter-symbol interference (ISI

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5

Bicais, Simon. "Design of the Physical Layer for Future Sub-TeraHertz Communication Systems." Thesis, Université Grenoble Alpes, 2020. https://tel.archives-ouvertes.fr/tel-03155951.

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Les futurs réseaux de communications pour déployer des services sans-fil très haut-débit envisagent l’utilisation de larges bandes de fréquences. Alors que les bandes de fréquences habituelles dans le spectre sub-6 GHz sont extrêmement prisées et limitées, la future génération de réseaux mobile amorce une montée en fréquence en exploitant les bandes millimétriques. Dans cette quête de ressources fréquentielles, le spectre sub-THz, de $90$ à $300$ GHz, offre des bandes disponibles d'une largeur sans précédent. Les communications sans-fil dans les fréquences sub-THz sont donc considérées comme u

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6

Feng, Helena Xuehong Chen. "Impact of the physical layer impairments on optical fiber communication systems /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2002. http://uclibs.org/PID/11984.

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7

Kong, Di. "Realistic physical layer performance evaluations for indoor and outdoor wireless communication systems." Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702138.

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Radio system parameters, antennas, the propagation are of fundamental importance in order to ensure good wireless communication performance. It is important to analyse the performance of wireless systems in realistic environments and under realistic assumptions. Over-simplifying these assumptions can lead to inaccurate conclusions. This thesis presents a comprehensive PHY layer performance analysis for a range of wireless communication systems in realistic indoor and outdoor environments. A method is developed to evaluate and ultimately optimise wireless communication systems by combining meas

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Shekhar, Hemabh. "Multi-antenna physical layer models for wireless network design." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22681.

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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Ingram, Mary Ann; Committee Member: Andrew, Alfred; Committee Member: Copeland, John; Committee Member: Owen, Henry; Committee Member: Sivakumar, Raghupathy.

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Gülgün, Ziya. "Physical Layer Security Issues in Massive MIMO and GNSS." Licentiate thesis, Linköpings universitet, Kommunikationssystem, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-172558.

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Wireless communication technology has evolved rapidly during the last 20 years. Nowadays, there are huge networks providing communication infrastructures to not only people but also to machines, such as unmanned air and ground vehicles, cars, household appliances and so on. There is no doubt that new wireless communication technologies must be developed, that support the data traffic in these emerging, large networks. While developing these technologies, it is also important to investigate the vulnerability of these technologies to different malicious attacks. In particular, spoofing and jammi

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Zarzo, Fuertes Luis. "OFDM PHY Layer Implementation based on the 802.11 a Standard and system performance analysis." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2796.

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<p>Wireless communication is facing one of the fastest developments of the last years in the fields of technology and computer science in the world. There are several standards that deal with it. In this work, the IEEE standard 802.11a, which deals with wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, is going to be discussed in detail. </p><p>Taking this into consideration, PHY specifications and its environment are going to be studied. </p><p>The work that the ISY department at the Institute of Technology of the Linköping University has proposed is to design

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11

Timilsina, Santosh. "Physical Layer Security in Training-Based Single-Hop/Dual-Hop Massive MIMO Systems." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2376.

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The broadcast nature of wireless medium has made information security as one of the most important and critical issues in wireless systems. Physical layer security, which is based on information-theoretic secrecy concepts, can be used to secure the wireless channels by exploiting the noisiness and imperfections of the channels. Massive multiple-input multiple-output (MIMO) systems, which are equipped with very large antenna arrays at the base stations, have a great potential to boost the physical layer security by generating the artificial noise (AN) with the exploitation of excess degrees-of-

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12

Jayasinghe, L. K. (Laddu Keeth Saliya). "Analysis on MIMO relaying scenarios in wireless communication systems." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526207391.

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Abstract The thesis concentrates on evaluating and improving performances of various multiple-input multiple-output (MIMO) relaying scenarios that are particularly relevant to future wireless systems. A greater emphasis is placed on important practical situations, considering relay deployments, availability of channel state information (CSI), limitations of spectrum, and information secrecy. Initially, the performance of a non-coherent amplify-and-forward (AF) MIMO relaying is analyzed when the relay is deployed with the relay-to-destination channel having a line-of-sight (LoS) path. The main

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Aquilué, de Pedro Ricardo. "Power line communications for the electrical utility: physical layer design and channel modeling." Doctoral thesis, Universitat Ramon Llull, 2008. http://hdl.handle.net/10803/9138.

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El món de les comunicacions per la xarxa elèctrica (CXE) pot ser dividit en tres grans tipus: CXE en baix voltatge (CXE-BV), en mig voltatge (CXE-MV) i en alt voltatge (CXE-AV). En aquests últims anys, les CXE-BV han atret una gran expectació, ja que les seves capacitats han fet d'aquesta tecnologia una bona opció com alternativa pel bucle local d'accés i pel desplegament de xarxes d'àrea local, focalitzades aquestes últimes en l'entorn domèstic. A més, les CXE-BV inclouen un conjunt d'aplicacions de baixa velocitat orientades a l'operador, com la lectura automàtica de comptadors (LAC), distr

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MelIios, Evangelos. "Physical layer analysis of communication systems integrating antenna characteristics and propagation modelling for indoor and outdoor environments." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629012.

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Good antenna performance is of fundamental importance in order to ensure good wireless link quality for the high data rate demanding modern communication systems. This thesis presents a comprehensive physical layer analysis with an aim to develop and demonstrate a set of essential tools and methodologies that can be utilised in order to answer the difficult question of which antenna system can achieve the best performance in complex multi path indoor and outdoor environments. An antenna model is initially introduced, which can be integrated with a physical propagation model in order to generat

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Paradise, Richard A. "Modeling and simulation of the physical layer of the single channel ground and airborne radio system (SINCGARS)." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Jun%5FParadise.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, June 2005.<br>Thesis Advisor(s): Frank Kragh, Herschel H. Loomis. Includes bibliographical references (p. 55-56). Also available online.

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Shahriar, Chowdhury M. R. "Resilient Waveform Design for OFDM-MIMO Communication Systems." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/56973.

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This dissertation addresses physical layer security concerns, resiliency of the Orthogonal Frequency Division Multiplexing (OFDM) and the Multiple Input Multiple Output (MIMO) systems; the `de-facto' air-interface of most wireless broadband standards including LTE and WiMAX. The major contributions of this dissertation are: 1) developing jamming taxonomy, 2) proposing OFDM and MIMO equalization jamming attacks and countermeasures, 3) developing antijam (AJ) MIMO systems, and 4) designing null space projected overlapped-MIMO radar waveform for spectrum sharing between radar and communications s

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17

Albehadili, Abdulsahib. "Link-signature in Physical Layer Security and Its Applications for PHY-key Generation, PHY-authentication, and Discriminatory Channel Estimation." University of Toledo / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1588784882183339.

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18

Zhou, Xiangyun. "Transmission resource allocation in multi-antenna wireless communication systems with channel uncertainty." Phd thesis, Institute of Electrical and Electronics Engineers (IEEE), 2013. http://hdl.handle.net/1885/9828.

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In this thesis we investigate the design of transmission resource allocation in current and future wireless communication systems. We focus on systems with multiple antennas and characterize their performance from an information-theoretic viewpoint. The goal of this work is to provide practical transmission and resource allocation strategies taking into account imperfections in estimating the wireless channel, as well as the broadcast nature of the wireless channel. In the first part of the thesis, we consider training-based transmission schemes in which pilot symbols are inserted into data bl

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19

Vajravelu, Dilip Kumar. "Connected Me - Proof of Concept." Thesis, Linköpings universitet, Elektroniksystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-100155.

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Connected Me is a Human Body Communication (HBC) system, which is used fortransferring data through human body. The working principle is based on theorycalled Body Coupled Communication (BCC), which uses electrostatic couplingfor transferring data between device and human body. Capacitance between bodyand electrode acts as an electrical interface between devices. BCC has become aprominent research area in the field of Personal Area Network (PAN), introducedby Zimmerman in 1995. Until now there have been significant amount of paperspublished on human body models and Analog Front End (AFE), but

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Ivan. "Vehicle to vehicle communication systems performance evaluation : A simulation approcach combining physical layer implementation, propagation channel model and antenna properties." Rennes, INSA, 2012. http://www.theses.fr/2012ISAR0009.

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V2X est un système de communication entre les véhicules (ou V2V) et entre les véhicules et l'infrastructure routière (véhicule à l'infrastructure, ou V2I) fonctionnant à 5,9 GHz, avec pour principal objectif d'améliorer la sécurité routière et d'augmenter la fluidité du trafic. L'évaluation des performances du système V2X par simulation numérique, reposant sur des modèles précis et éprouvés, constitue une étape fondamentale dans une logique de conception-validation avant l'intégration sur véhicule réel. Le travail présenté dans ce document se concentre sur les techniques de simulation pour l'é

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Mahal, Jasmin Ara. "Analysis of Jamming-Vulnerabilities of Modern Multi-carrier Communication Systems." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/83570.

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The ever-increasing demand for private and sensitive data transmission over wireless networks has made security a crucial concern in the current and future large-scale, dynamic, and heterogeneous wireless communication systems. To address this challenge, wireless researchers have tried hard to continuously analyze the jamming threats and come up with improved countermeausres. In this research, we have analyzed the jamming-vulnerabilities of the leading multi-carrier communication systems, Orthogonal Frequency Division Multiplexing (OFDM) and Single-Carrier Frequency Division Multiple Access (S

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Rontani, Damien. "Communications with chaotic optoelectronic systems - cryptography and multiplexing." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42810.

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With the rapid development of optical communications and the increasing amount of data exchanged, it has become utterly important to provide effective ar- chitectures to protect sensitive data. The use of chaotic optoelectronic devices has already demonstrated great potential in terms of additional computational security at the physical layer of the optical network. However, the determination of the security level and the lack of a multi-user framework are two hurdles which have prevented their deployment on a large scale. In this thesis, we propose to address these two issues. First, we inve

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23

O'Shea, Timothy James. "Learning from Data in Radio Algorithm Design." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/89649.

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Algorithm design methods for radio communications systems are poised to undergo a massive disruption over the next several years. Today, such algorithms are typically designed manually using compact analytic problem models. However, they are shifting increasingly to machine learning based methods using approximate models with high degrees of freedom, jointly optimized over multiple subsystems, and using real-world data to drive design which may have no simple compact probabilistic analytic form. Over the past five years, this change has already begun occurring at a rapid pace in several fi

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Wolf, Anne. "Robust Optimization of Private Communication in Multi-Antenna Systems." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-203827.

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The thesis focuses on the privacy of communication that can be ensured by means of the physical layer, i.e., by appropriately chosen coding and resource allocation schemes. The fundamentals of physical-layer security have been already formulated in the 1970s by Wyner (1975), Csiszár and Körner (1978). But only nowadays we have the technical progress such that these ideas can find their way in current and future communication systems, which has driven the growing interest in this area of research in the last years. We analyze two physical-layer approaches that can ensure the secret transmission

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Jo, Youngho. "Physical layer techniques for wireless communication security." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0041108.

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Muhammad, I. (Irfan). "Physical layer security for machine type communication networks." Master's thesis, University of Oulu, 2018. http://jultika.oulu.fi/Record/nbnfioulu-201809212821.

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Abstract. We examine the physical layer security for machine type communication networks and highlight a secure communication scenario that consists of a transmitter Alice, which employs Transmit Antenna Selection, while a legitimate receiver Bob that uses Maximum Ratio Combining, as well as an eavesdropper Eve. We provide a solution to avoid eavesdropping and provide ways to quantify security and reliability. We obtain closed-form expressions for Multiple-Input Multiple-Output and Multi-antenna Eavesdropper (MIMOME) scenario. The closed{-}form expressions for three useful variations of MIMOME

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Zhuang, Yifei. "Physical layer security in MIMO power line communication networks." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50241.

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It has been well established that multiple-input multiple-output (MIMO) transmission using multiple conductors can improve the data rate of power line communication (PLC) systems. In this thesis, we investigate whether the presence of multiple conductors could also facilitate the communication of confidential messages by means of physical layer security methods. In particular, this thesis focuses on the secrecy capacity of MIMO PLC. Numerical experiments show that multi-conductor PLC networks can enable a more secure communication compared to the single conductor case. On the other hand, we de

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Bi, Ying. "Enhancing Physical-Layer Security in Wireless Powered Communication Networks." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/16890.

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In modern society, the communications sector is a critical enabler of economic and social activity. Despite the benefit of the improved ubiquitousness, the rapid diffusion of communications technologies is driving one to question the security of communications networks and systems. It is this situation which has motivated the research and development work to be reported in this thesis. Especially, this thesis consists of two parts: The first part focuses on our main research under the umbrella of physical-layer security (PLS), and the second part presents our work on security and data manageme

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Dandekar, Kapil Ramesh. "Space division multiple access systems : computational electromagnetic studies of the physical and network layers /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008307.

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Abu, Almaalie Zina. "Free space optical wireless communication with physical layer network coding." Thesis, Northumbria University, 2016. http://nrl.northumbria.ac.uk/32546/.

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Terrestrial free-space optical (FSO) communications is an emerging low-cost, licensefree and high-bandwidth access solution for a number of applications including the “last mile” access network. However, for a transmission range from a few meter to longer than 1 km, a number of atmospheric phenomena, such as rain, haze, fog, snow, scintillation and pointing errors become a major performance limiting factors in FSO systems resulting in link deterioration and ultimately complete link failure. Relay-assisted technique is capable of mitigating the signal fading and maintain acceptable performance

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FERRARI, ALESSIO. "Physical layer aware open optical networking." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2957734.

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Bhatia, Nikhil S. "A Physical Layer Implementation of Reconfigurable Radio." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/35926.

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The next generation of wireless communications will demand the use of software radio technology as the basic architecture to support multi-standard, multi-mode and future-proof radio designs. Software-defined radios are configurable devices in which the physical layer can be reprogrammed to support various standards. Field programmable architectures provide a suitable platform to achieve such run-time reconfigurations of the physical layer of the radio. This thesis explores the use of FPGAs in the design of reconfigurable radios. The results presented here demonstrate how FPGAs can be used to

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QIAO, YUE. "Attacks and Counterattacks on Physical Layer Primitives." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1494284803751621.

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Xing, Hong. "Enhancing physical-layer security in wireless powered communication network : challenges and opportunities." Thesis, King's College London (University of London), 2016. http://kclpure.kcl.ac.uk/portal/en/theses/enhancing-physicallayer-security-in-wireless-powered-communication-network(34c5e7ec-8c94-4d3a-a583-7f8d21115b15).html.

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Among various means of energy harvesting (EH) for green communications, radio-frequency (RF)-enabled wireless energy harvesting (WEH), inter alia, has recently drawn significant interest for its long operational distance and effective energy multicasting; it thus motivates the paradigm of wireless powered communication network (WPCN). Nevertheless, besides benefitting from the broadcast nature of wireless channels, WPCN is also vulnerable in terms of confidentiality and privacy of the data transmission, since legitimate information may be eavesdropped by unauthorized parties. To resolve this i

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Hui, Shui-wing David. "Cross-layer design for OFDMA wireless system." View the Table of Contents & Abstract, 2007. http://sunzi.lib.hku.hk/hkuto/record/B36996439.

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Hui, Shui-wing David, and 許樹榮. "Cross-layer design for OFDMA wireless system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B37427179.

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Peiffer, Benjamin Michael. "Design and verification of physical layer architecture for a 1-wire sensor communication bus." Thesis, University of Iowa, 2011. https://ir.uiowa.edu/etd/1053.

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Within this thesis, the problem of device and sensor communication is discussed. Recent sensor network implementations and deployments at the University of Iowa IIHR-Hydroscience and Engineering (IIHR) and the Iowa Flood Center (IFC) have motivated the need for an efficient, shared, 1-wire communication scheme. Possible solutions will be explored and discussed briefly within this chapter. The focus of this thesis is the development of a particular solution for a 1-wire physical layer utilizing the concept of Code Division Multiple Access (CDMA).

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Zhang, Xiaohu. "VHF & UHF energy harvesting radio system physical and MAC layer considerations." Thesis, Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1435.

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Eriksson, Emil. "Refinement of an emulator for the physical layer of the wireless communication of sensor networks." Thesis, Uppsala universitet, Signaler och System, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-216819.

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Wireless sensor networks have applications in many different fields and environments, each with their own set of challenges to be overcome. If we can measure and compensate for the properties of the wireless environment at an early stage of the deployment, we will be able to have the sensor network operational in a smaller time frame. This report describes the development of an emulator for wireless sensor network of up to eight 802.15.4 complaint sensor nodes. The FPGA-based emulator has been enhanced with several new features to remove some shortcomings of the existing emulator. The emulator

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Qin, Zhengrui. "Security Supports for Cyber-Physical System and its Communication Networks." W&M ScholarWorks, 2016. https://scholarworks.wm.edu/etd/1477067975.

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A cyber-physical system (CPS) is a sensing and communication platform that features tight integration and combination of computation, networking, and physical processes. In such a system, embedded computers and networks monitor and control the physical processes through a feedback loop, in which physical processes affect computations and vice versa. In recent years, CPS has caught much attention in many different aspects of research, such as security and privacy. In this dissertation, we focus on supporting security in CPS and its communication networks. First, we investigate the electric powe

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Yang, Chengchen. "CYBER-PHYSICAL SYSTEM: REAL-TIME INTERNET-BASED WIRELESS STRUCTURAL HEALTH MONITORING SYSTEM." OpenSIUC, 2009. https://opensiuc.lib.siu.edu/dissertations/111.

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As the demands to monitor the health status of structures increase, researchers around the world have proposed several concepts to solve this issue. This research first examines the existing technologies and then works toward a novel structural health monitoring solution. A comprehensive discussion includes major topics from sensor selection and installation to sensing data display. A cyber-physical system combining embedded system, wireless communication, and the Java platform was developed for structural health monitoring. The focus of this system is to continuously monitor structural re

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Sun, Xiaole, and Ivan B. Djordjevic. "Physical-Layer Security in Orbital Angular Momentum Multiplexing Free-Space Optical Communications." IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2016. http://hdl.handle.net/10150/615106.

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The physical-layer security of a line-of-sight (LOS) free-space optical (FSO) link using orbital angular momentum (OAM) multiplexing is studied. We discuss the effect of atmospheric turbulence to OAM-multiplexed FSO channels. We numerically simulate the propagation of OAM-multiplexed beam and study the secrecy capacity. We show that, under certain conditions, the OAM multiplexing technique provides higher security over a single-mode transmission channel in terms of the total secrecy capacity and the probability of achieving a secure communication. We also study the power cost effect at the tra

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Голубничий, Олексій Георгійович, Алексей Георгиевич Голубничий та Alexei Holubnychyi. "Методологія синтезу та обробки узагальнених бінарних послідовностей Баркера для широкосмугових каналів зв’язку". Thesis, Національний авіаційний університет, 2020. https://er.nau.edu.ua/handle/NAU/44147.

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Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.12.02 – «Телекомунікаційні системи та мережі». – Національний авіаційний університет, Київ, 2019. У дисертаційній роботі вирішується актуальна науково-технічна проблема синтезу бінарних дискретно-кодованих послідовностей (ДКП), які є оптимальними за мінімаксним критерієм щодо їх автокореляційної функції (АКФ), у частині синтезу регулярних структур цих ДКП та їх комбінаторних систем в умовах обмежень на максимальний рівень абсолютних значень бічних пелюсток їх АКФ (ДКП Баркера). Вирішенням зазначеної про

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Nappier, Jennifer M. "An FPGA Abstraction Layer for the Space Telecommunications Radio System." Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1227033556.

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Kittichokechai, Kittipong. "Communication With Reconstruction and Privacy Constraints." Doctoral thesis, KTH, Kommunikationsteori, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145134.

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Communication networks are an integral part of the Internet of Things (IoT) era. They enable endless opportunities for connectivity in a wide range of applications, leading to advances in efficiency of day-to-day life. While creating opportunities, they also incur several new challenges. In general, we wish to design a system that performs optimally well in all aspects. However, there usually exist competing objectives which lead to tradeoffs. In this thesis, driven by several applications, new features and objectives are included into the system model, making it closer to reality and needs. T

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Ajayi, Idowu Iseoluwa. "Enhanced Physical Layer Security through Frequency and Spatial Diversity." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS227.

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La sécurité de la couche physique (PLS) est un paradigme émergent qui se concentre sur l'utilisation des propriétés de la communication sans fil, telles que le bruit, l'évanouissement, la dispersion, l'interférence, la diversité, etc. pour assurer la sécurité entre les utilisateurs légitimes en présence d'un espion. Comme le PLS utilise des techniques de traitement du signal et de codage, il intervient au niveau de la couche physique et peut donc garantir le secret quelle que soit la puissance de calcul de l'espion. Cela en fait une approche intéressante pour compléter la cryptographie traditi

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Chen, Kan. "Physical layer security in co-operative MIMO networks - key generation and reliability evaluation." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/32839.

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Doctor of Philosophy<br>Department of Electrical and Computer Engineering<br>Balasubramaniam Natarajan<br>Widely recognized security vulnerabilities in current wireless radio access technologies undermine the benefits of ubiquitous mobile connectivity. Security strategies typically rely on bit-level cryptographic techniques and associated protocols at various levels of the data processing stack. These solutions have drawbacks that have slowed down the progress of new wireless services. Physical layer security approaches derived from an information theoretic framework have been recently propose

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Tunaru, Iulia. "Physical layer secret key generation for decentralized wireless networks." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S081/document.

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Dans cette thèse on s’est intéressé aux méthodes de génération de clés secrètes symétriques en utilisant la couche physique ultra large bande impulsionnelle (IR-UWB). Les travaux ont été réalisés selon trois axes, les deux premiers concernant la communication point-à-point et le dernier, les communications coopératives. Tout d’abord, la quantification des signaux typiques IR-UWB (soit directement échantillonnés, soit estimés) a été investiguée, principalement du point de vue du compromis entre la robustesse (ou réciprocité) des séquences binaires obtenues et leur caractère aléatoire. Différent

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Nguyen, Alex The Phuong. "Short frame wireless communications : new challenges for the physical layer." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2019. http://www.theses.fr/2019IMTA0154.

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Les systèmes de communication sans fil à venir vont faire un usage intensif des transmissions de paquets courts. La norme 5G émergente en est un exemple parfait, pour lequel deux des trois principaux cas d'utilisation, les communications massives de type machine (mMTC) et les communications ultra fiables à faible latence (URLLC), reposent intrinsèquement sur des paquets courts. Un autre exemple est fourni par les récents réseaux d'accès de faible puissance (LPWAN) tels que Sigfox, LoRa, etc. et conçus pour prendre en charge l'IoT. L'utilisation de paquets courts au niveau de la couche physique

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Ho, Ka Ming. "Cross-layer design of FDD-OFDM system based on ACK/NAK feedbacks /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20HO.

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