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 195 for “"Cognitive radio"”.
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Spectrum monitor for cognitive radio
The concept of a cognitive radio assumes that the receiver is able to determine the activity level across a large range of spectrum in order to assign a channel for its use. Hence a key function is a spectrum monitor to detect the spectrum availability as a first step. This thesis explores the …
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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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A Cognitive Radio Compressive Sensing Framework
… challenging given the limited availability of radio spectrum, and is further exacerbated by a rigid licensing regulatory regime. Spectrum however, is largely underutilized and this has prompted regulators to promote the concept of opportunistic spectrum access. This allows unlicensed secondary …
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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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A Zynq-based Cluster Cognitive Radio
Traditional hardware radios provide very rigid solutions to radio problems. Intelligent software defined radios, also known as cognitive radios, provide flexibility and agility compared to hardware radio systems. Cognitive radios are well suited for radio applications in a changing radio frequency …
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Spectrum management in cognitive radio wireless networks
… new area of research foresees the development of cognitive radio (CR) networks to further improve spectrum efficiency. The basic idea of CR networks is that the unlicensed devices (also called CR users) share wireless channels with the licensed devices (also known as primary users) that are …
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Dynamic resource allocation for cognitive radio systems
Cognitive Radio (CR) is considered to be a novel approach to improve the underutilization of precious radio resources by exploiting the unused licensed spectrum in dynamically changing environments. Designing efficient resource allocation algorithms for dynamic spectrum sharing and for power …
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Precoder Design for Cooperative Cognitive Radio Systems
Cognitive radio (CR) has been an active area of research in wireless communication in recent years. In this thesis, optimal transmission strategies at the source and relay nodes in cooperative underlay CR systems assumption are studied with an aim of achieving maximum possible throughput for the …
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Interference Control of Indoor Cognitive Radio Systems
… the re-use occurs inside a building that shields radio signals and re- duces interference to the primary system. However buildings typically do not have equal radio shielding ability. The SUs will be required to adjust their transmit powers according to their locations in the building in order to …
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Power Consumption Optimization: A Cognitive Radio Approach
… significant power reduction through limited radio reconfiguration based on the channel conditions, especially for short range sensor network applications. A cognitive radio (CR) is an intelligent wireless communication system which is able to determine the most favorable operating parameters …
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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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Statistical Experimental Design Framework for Cognitive Radio
… approach to identifying decisions for adapting cognitive radio parameters with no a priori knowledge of the environment. Cognitively inspired radios, attempt to combine observed metrics of system performance with artificial intelligence decision-making algorithms. Current architectures trend …
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Cognitive Radio Engine Design for Link Adaptation
… we make contributions in three main areas of Cognitive Engine (CE) design for link adaptation. The three areas are CE design, CE training, and the impact of imperfect observations in the operation of the CE. First, we present a CE design for link adaptation and apply it to a system which can …
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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 sensing and utilization for cognitive radio
Cognitive radio (CR) technology has recently been introduced to opportunistically exploit the spectrum. We present a robust and cost-effective design to ensure the improvement of spectrum efficiency with CR. We first propose probability-based spectrum sensing by utilizing the statistical …
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Efficient Radiometric Signature Methods for Cognitive Radio Devices
… first comprehensive study and new methods for radiometric fingerprinting of the Cognitive Radio (CR) devices. The scope of the currently available radio identification techniques is limited to a single radio adjustment. Yet, the variable nature of the CR with multiple levels of parameters and …
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Study of cyclostationary feature detectors for cognitive radio
Cognitive radio (CR) is seen as one of the revolutionary techniques for future spectrum utilization. The first and probably the most challenging task for CR is to detect/sense the white space of the spectrum for its usage. In this thesis, detection of DVB-T signals is studied since TV band has been …
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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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