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 97 for “"Spectrum Sharing"”.
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Spectrum sharing in cognitive radio networks
… wireless communication services and conservative spectrum allocation policies by government regulators have led to spectrum scarcity. On the other hand, spectrum measurement campaigns have indicated that the actual occupancy of most licensed frequency bands is quite low. In recent years, Cognitive …
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Interference Management in Spectrum Sharing Systems
Most of the radio spectrum is allocated to licensed services for their exclusive use. This has led to a shortage of spectrum for deploying new wireless services. However, measurements show that a large amount of radio spectrum allocated to licensed services is temporally and spatially …
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Transmitter Authentication in Dynamic Spectrum Sharing
Recent advances in spectrum access technologies, such as software-defined radios, have made dynamic spectrum sharing (DSS) a viable option for addressing the spectrum shortage problem. However, these advances have also contributed to the increased possibility of "rogue" transmitter radios which may …
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Coexistence of Wireless Systems for Spectrum Sharing
Sharing a band of frequencies in the radio spectrum among multiple wireless systems has emerged as a viable solution for alleviating the severe capacity crunch in next-generation wireless mobile networks such as 5th generation mobile networks (5G). Spectrum sharing can be achieved by enabling …
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Spectrum sharing for two-way relay networks
… each other. We study the problem of the resource sharing such that the smaller of the data rates of two relays is maximized.
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Spectrum Sharing between Radar and Communication Systems
Radio frequency spectrum is a scarce natural resource that is utilized for many services including surveillance, navigation, communication, and broadcasting. Recent years have seen tremendous growth in use of spectrum especially by commercial cellular operators. As a result, cellular operators are …
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Learning Schemes for Adaptive Spectrum Sharing Radar
… demand for access to the electromagnetic (EM) spectrum to an all-time high. In particular, wireless applications related to the fifth generation (5G) of cellular technology along with statically allocated radar systems have contributed to the increasing scarcity of the sub 6 GHz frequency …
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Spectrum sharing in next generation wireless communication networks
… capacity is physically restricted by the limited spectrum resource. Therefore, spectrum sharing has been proposed to break this constraint. This thesis studied the emerging spectrum sharing frameworks and enabling spectrum sharing in cellular networks. Our work focuses on two main spectrum sharing …
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Spectrum sharing for multi-user massive MIMO networks
… the impact of employing an underlay spectrum sharing (USS) scheme on the performance of two massive multi-input-multi-output (MIMO) networks. We explore an USS approach where a multi-user massive MIMO network (primary network (PN)), i.e., the owner of the frequency spectrum, allows …
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Effective Resource Allocation for Non-cooperative Spectrum Sharing
Spectrum access protocols have been proposed recently to provide flexible and efficient use of the available bandwidth. Game theory has been applied to the analysis of the problem to determine the most effective allocation of the users’ power over the bandwidth. However, prior analysis has focussed …
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Spectrum Efficiency and Security in Dynamic Spectrum Sharing
… major paradigm shift in how we manage the radio spectrum. This paradigm shift in spectrum management from exclusive access to shared access is necessitated by the growth of wireless services and the demand pressure imposed on limited spectrum resources under legacy management regimes. The primary …
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Towards realisation of spectrum sharing of cognitive radio networks
… (CRN) have emerged as a promising solution to spectrum shortcoming, thanks to Professor Mitola who coined Cognitive Radios. To enable efficient communications, CRNs need to avoid interference to both Primary (licensee) Users (PUs), and among themselves (called self-coexistence). In this thesis, …
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Interference Avoidance based Underlay Techniques for Dynamic Spectrum Sharing
Dynamic spectrum sharing (DSS) is a new paradigm for spectrum allocation that is expected to lead to more efficient spectrum usage and alleviate the spectrum-scarcity that has been perceived in recent years. DSS refers to the opportunistic, dynamic, and uncoordinated use of the spectrum by …
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Spectrum sharing systems for improving spectral efficiency in cognitive cellular network
Since spectrum is the invisible infrastructure that powers the wireless communication, the demand has been exceptionally increasing in recent years after the implementation of 4G and immense data requirements of 5G due to the applications, such as Internet-of-Things (IoT). Therefore, the effective …
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Ex Ante Approaches for Security, Privacy, and Enforcement in Spectrum Sharing
… are devices that are capable of sensing the spectrum and using its free portions in an opportunistic manner. The free spectrum portions are referred to as white spaces or spectrum holes. It is widely believed that CRs are one of the key enabling technologies for realizing a new regulatory …
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Cooperative Game Theory and Non-convex Optimization Analysis of Spectrum Sharing
Opportunistic spectrum access has become a high priority research area in the past few years. The motivation behind this actively researched area is the fact that the limited spectrum available is currently being utilized in an inefficient way. The complete wireless spectrum is assigned and …
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Security and Performance Issues in Spectrum Sharing between Disparate Wireless Networks
… Service (CRBS) in the 3.5 GHz band to enable sharing between wireless broadband devices and incumbent radar systems. This sharing will be enabled by use of geolocation database with supporting infrastructure termed as Spectrum Access System (SAS). Although using SAS for spectrum sharing has …
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Resource Allocation with Carrier Aggregation for Spectrum Sharing in Cellular Networks
… Increasing the utilization of the existing spectrum can significantly improve network capacity, data rates and user experience. Spectrum sharing enables wireless systems to harvest under-utilized swathes of spectrum, which would vastly increase the efficiency of spectrum usage. Making more …
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DESIGN AND ANALYSIS OF COGNITIVE MASSIVE MIMO NETWORKS WITH UNDERLAY SPECTRUM SHARING
… and then access and utilize the primary network spectrum for information transmission, and (3) developing a secure communication strategy for cognitive multi-user massive MIMO systems, where physical layer secure transmissions are provisioned for both primary and secondary systems by exploiting …
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