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 98 for “"Cognitive Radio Networks"”.
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Spectrum sharing in cognitive radio networks
… frequency bands is quite low. In recent years, Cognitive radio has emerged as a promising solution to increase spectrum occupancy and tackle spectrum scarcity. Cognitive radio enables the unlicensed (secondary) user to establish a communication link in licensed spectrum on the condition that …
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Spectrum Sensing in Cognitive Radio Networks
Given the ever-growing demand for radio spectrum, cognitive radio has recently emerged as an attractive wireless communication technology. This dissertation is concerned with developing spectrum sensing algorithms in cognitive radio networks where a single or multiple cognitive radios (CRs) assist …
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Medium Access Control in Cognitive Radio Networks
Cognitive radio (CR) is seen as one of the enabling technologies for realizing a new regulatory spectrum management paradigm, viz. opportunistic spectrum sharing (OSS). In the OSS paradigm, unlicensed users (a.k.a. secondary users) opportunistically operate in fallow licensed spectrum on a …
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Enhancing Attack Resilience in Cognitive Radio Networks
… has resulted in the overcrowding of those bands. Cognitive radio (CR) is a new technology that enables an unlicensed user to coexist with incumbent users in licensed spectrum bands without inducing interference to incumbent communications. This technology can significantly alleviate the spectrum …
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Efficient spectrum-handoff schemes for cognitive radio networks
Radio spectrum access is important for terrestrial wireless networks, commercial earth observations and terrestrial radio astronomy observations. The services offered by terrestrial wireless networks, commercial earth observations and terrestrial radio astronomy observations have evolved due to …
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Towards realisation of spectrum sharing of cognitive radio networks
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 …
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Resource management of cognitive radio networks with optimization methods.
The deployment of cognitive radio networks provides a promising future for wireless communications with higher spectrum efficiency. A cognitive radio transceiver senses its environment and dynamically adapts its transmission methods and the channel usage so that the induced interference to the …
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Multi-Slot Cooperative Spectrum Sensing for Cognitive Radio Networks
A key challenge with current radio access technologies and a consideration in the implementation of next generation radio access networks is limited spectrum availability. Current mobile technologies have been standardized to operate within reserved, dedicated frequency bands. Network operators are …
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Combined Soft Hard Cooperative Spectrum Sensing in Cognitive Radio Networks
… enhance the performance of spectrum sensing in cognitive radio systems while accounting for the cost and bandwidth limitations in practical scenarios is the main objective of this thesis. We focus on an essential element of cooperative spectrum sensing (CSS) which is the data fusion that …
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MULTI USER COOPERATION SPECTRUM SENSING IN WIRELESS COGNITIVE RADIO NETWORKS
… devices and services, the demand for the radio spectrum is increasing at a rapid rate, which leads to making the spectrum more and more crowded. The limited available spectrum and the inefficiency in the spectrum usage have led to the emergence of cognitive radio (CR) and dynamic spectrum …
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Binary consensus-based cooperative spectrum sensing in cognitive radio networks
… for distributed cooperative spectrum sensing in cognitive radio networks. We propose to use two binary approaches, namely diversity and fusion binary consensus spectrum sensing. The performance of these algorithms is analyzed over fading channels. The probability of networked detection and false …
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Opportunistic Spectrum Utilization by Cognitive Radio Networks: Challenges and Solutions
Cognitive Radio Network (CRN) is 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 …
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MANAGING DYNAMIC SPECTRUM ACCESS UNDER UNCERTAINTY IN COGNITIVE RADIO NETWORKS
Cognitive Radio Networks (CRNs) allow unlicensed users (secondary users, or SUs) to opportunistically access the licensed spectrum without causing disruptive interference to the primary users (PUs). One of the main challenges in CRNs is the ability to detect PU transmissions. Recent works have …
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Learning-based adaptive design for dynamic spectrum access in cognitive radio networks.
… is concerned with dynamic spectrum access in cognitive radio networks. The main objective is designing online learning and access policies which maximize the total throughput of the secondary users in a cognitive radio network. As the first approach, we consider the auction-based formulation …
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Spectrum decision making in distributed cognitive radio networks using an optimal foraging approach
In the recent past, Cognitive Radio (CR) technology has been regarded in the literature as the most promising technology for performing dynamic spectrum management. One of the major aspects of the spectrum management is referred to as the decision-making ability of CR users. Spectrum …
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Analysis and Design of Cognitive Radio Networks and Distributed Radio Resource Management Algorithms
Cognitive radio is frequently touted as a platform for implementing dynamic distributed radio resource management algorithms. In the envisioned scenarios, radios react to measurements of the network state and change their operation according to some goal driven algorithm. Ideally this flexibility …
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