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 16 of 16 for “"Unlicensed Spectrum"”.
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The impact of the TV white space unlicensed spectrum on the wireless industry competition
… 2008, the United States FCC voted to allow unlicensed use of the spectrum designated for TV broadcasting. After the analog-to-digital transition was completed in June 2009, space between channels was no longer needed for the successful transmission of TV signals. These unused portions of the …
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Design of a High Capacity, Scalable, and Green Wireless Communication System Leveraging the Unlicensed Spectrum
… rate requires a several fold increase in spectrum. The use of unlicensed spectrum is thus critically needed to aid the existing licensed spectrum to meet such a huge mobile wireless data traffic growth demand in a cost effective manner. The deployment of Long Term Evolution (LTE) in the …
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Paving the Path of LTE Toward 5G: Physical Layer Assurance and Operation in the Unlicensed Spectrum
… operators to strive for new innovations. LTE-Unlicensed has been recently proposed to allow cellular network operators to offload some of their data traffic by accessing the unlicensed 5 GHz frequency band. There are three variants of LTE-Unlicensed that have been proposed in the industry. …
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Performance Analysis and Modelling of Spectrum Handoff Schemes in Cognitive Radio Networks. Modelling and Analysis of Spectrum Handoff Decision Schemes in Cognitive Radio Networks using the Queuing Theory and Simulation for Licensed and Unlicensed Spectrum Bands.
… controlled by the available radio frequency spectrum, government regulatory agencies have recently adopted a strict approach to the licensing of limited amounts of spectrum to different entities (e.g., public safety, military, service providers, unlicensed devices, and TV). All of them …
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Performance Analysis of Coexistence Schemes for LTE in Unlicensed Bands
LTE in the unlicensed spectrum, is becoming a popular area of research. Since LTE-Unlicensed (LTE-U) provides subscribers with higher-quality mobile voice, and video experience in high-traffic or low-signal locations, a fair coexistence mechanism with other networks, like Wi-Fi is essential. In …
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Municipal wireless mesh networks as a competitive broadband delivery platform
… for indoor LAN applications operating in unlicensed spectrum. Also, the Municipalities claim that their main targets are Public Safety and the low-income neighborhood that cannot afford DSL or Cable broadband. There is a doubt, however, that the current plan will deliver on its promises in …
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Data-driven Estimation of Low-Power Long-Range Signal Parameters by an Unauthenticated Agent using Software Radio
… each other, often with limited power and over unlicensed spectrum bands that are susceptible to interference, eavesdropping, and Denial-of-Service (DoS) attacks. In this work, we consider a popular low-power, long-range communication protocol known as LoRa. Despite LoRa's high tolerance for …
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Advanced Site-Specific Propagation Prediction Techniques
… National Information Infrastructure band. This unlicensed spectrum was allocated in January of 1997 and holds promising applications for public and private telecommunications, home-based wireless internet, wireless local loops, and any number of wideband wireless applications. There is an …
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Wireless networks for the developing world
… public policies evolve, an increasing amount of spectrum is being set aside for transmission use without a license. These license-exempt, or "unlicensed" bands, include 2.4 GHz and 5 GHz in the USA and much of Europe. I argue that this unlicensed spectrum, and low-cost wireless technologies that …
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Security and Performance Issues in Spectrum Sharing between Disparate Wireless Networks
… with supporting infrastructure termed as Spectrum Access System (SAS). Although using SAS for spectrum sharing has many pragmatic advantages, it also raises potentially serious operational security (OPSEC) issues. In this thesis, we explore OPSEC, location privacy in particular, of …
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Converged video delivery over heterogeneous networks
… by users using streaming video. Cellular spectrum is a scarce and expensive resource for operators, and by allowing them to offload traffic to Wi-Fi networks in unlicensed spectrum they can free cellular spectrum for more valuable applications. Wi-Fi offload has, however, suffered from the …
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Opportunistic Spectrum Utilization by Cognitive Radio Networks: Challenges and Solutions
… an emerging paradigm that makes use of Dynamic Spectrum Access (DSA) to communicate opportunistically, in the un-licensed Industrial, Scientific and Medical bands or frequency bands otherwise licensed to incumbent users such as TV broadcast. Interest in the development of CRNs is because of …
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Integrated Wideband Self-Interference Cancellation Techniques for FDD and Full-Duplex Wireless Communication
… continues to drive research that enables new spectrum opportunities, reduces form factor and lowers the cost of hardware solutions. The current RF spectrum, which is often referred to as the frequency band from 1-6GHz, has become increasingly crowded with only a limited amount of unused and …
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xG-SS: Towards a Hardware and Simulation Experimentation Platform for Spectrum Sharing with 5G NR-U
… wireless systems and the increasing demand for spectrum to accommodate a growing number of users and diverse services have necessitated novel ap- proaches to spectrum sharing. Among these approaches, distributed spectrum sharing offers the most flexibility by allowing real-time spectrum use …
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Real-Time Resource Optimization for Wireless Networks
… fair coexistence between LTE and Wi-Fi in the unlicensed spectrum. The real-time requirement for finding the optimal channel division and LTE resource allocation solution is on 1 ms time scale. This problem involves the optimal division of transmission time for LTE and Wi-Fi across multi- ple …
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Coexistence of Vehicular Communication Technologies and Wi-Fi in the 5 and 6 GHz bands
The unlicensed wireless spectrum offers exciting opportunities for developing innovative wireless applications. This has been true ever since the 2.4 GHz band and parts of the 5 GHz bands were first opened for unlicensed access worldwide. In recent years, the 5 GHz unlicensed bands have been one of …