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.
Results
Showing 1 to 16 of 16 for “"dynamic spectrum sharing"”.
-
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 …
-
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 …
-
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 …
-
Designing a dynamic spectrum sharing algorithm between DCS and LTE in the 1800 MHz band: a case study of a mobile telecommunication operator in Zimbabwe
… around the world have allocated licensed spectrum chunks to different wireless services to meet the increasing demand. Despite technological advancements such as Multiple Input Multiple Output (MIMO) communications, heterogeneous networks, and cooperative communications, spectrum scarcity …
-
Dynamic resource allocation for cognitive radio systems
… resources by exploiting the unused licensed spectrum in dynamically changing environments. Designing efficient resource allocation algorithms for dynamic spectrum sharing and for power allocation in OFDM-CR networks is still a challenging problem. In this thesis, we specifically deal with …
-
On the Benefit of Cooperation of Secondary Users in Dynamic Spectrum Access
… has been the licensing authority for wireless spectrum. Traditionally, spectrum was commercially licensed to primary users with defined uses. With the growth of personal communication systems in the 1990''s, unallocated spectrum has become a scarce commodity. However, since most primary users …
-
Improvements to Enhance The Security and Reliability of Crowdsourced Spectrum Access Systems and Cognitive Radio Networks
This dissertation addresses key challenges in dynamic spectrum sharing within Cognitive Radio Networks (CRNs) and Spectrum Access Systems (SASs), focusing on the U.S. 3.5 GHz Citizens Broadband Radio Service (CBRS) band. A structured survey of existing regulatory frameworks, coordination methods, …
-
Spectrum Auctions for Dynamic Spectrum Access Networks
… designing an auction-based market mechanism for dynamic spectrum sharing when there are multiple sellers and multiple buyers. We assume that the sellers are selfish players and focus on an optimal auction mechanism that maximizes the expected payoff or profit of the seller. First, we study the …
-
FPGA Reservoir Computing Networks for Dynamic Spectrum Sensing
… such as device-to-device (D2D) communication and dynamic spectrum sharing (DSS). This challenge has inspired a wave of research in energy efficient machine learning hardware with low computational and area overhead. In particular, hardware implementations of the delayed feedback reservoir (DFR) …
-
One Size Does Not Fit All: Optimizing Sequence Length with Recurrent Neural Networks for Spectrum Sensing
With the increase in spectrum congestion, intelligent spectrum sensing systems have become more important than ever before. In the field of Radio Frequency Machine Learning (RFML), techniques like deep neural networks and reinforcement learning have been used to develop more complex spectrum …
-
Deep Reinforcement Learning for Next Generation Wireless Networks with Echo State Networks
… of capturing the temporal correlation of the dynamic environment that only requires limited training overhead. In this dissertation, we design efficient DRL frameworks by utilizing echo state network (ESN), which is a special type of RNNs where only the output weights are trained. To be …
-
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 …
-
Privacy and Authentication in Emerging Network Applications
… resources. For example, in a centralized dynamic spectrum access (DSA) system, the spectrum resource licensees called incumbent users (IUs), have strong operational privacy requirements for the DSA service provider called spectrum access system (SAS), and hence SAS is required to perform …
-
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 …
-
Blockchain and Distributed Consensus: From Security Analysis to Novel Applications
… usage control and decentralized spectrum access system. First, we use blockchain to tackle a long-standing privacy challenge of data misuse. Individual data owners often lose control on how their data can be used once sharing the data with another party, epitomized by the …
-
Energy Efficient Deep Spiking Recurrent Neural Networks: A Reservoir Computing-Based Approach
… a novel structure of RNNs which is inspired by dynamic delayed feedback loops is introduced. In the reservoir (recurrent) layer of DFR, only one neuron is required which makes DFRs extremely suitable for hardware implementations. The main motivation of this dissertation is to introduce an energy …