Spectrum Efficiency Maximization in Cognitive Radio Systems PDF Download

Author: Liaoyuan Zeng
Publisher: LAP Lambert Academic Publishing
ISBN: 9783847304999
Category : Cognitive radio networks
Languages : en
Pages : 236

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Book Description
In the field of cognitive radio, Spectrum Efficiency Maximization in Cognitive Radio Systems makes excellent dynamic radio resource allocation algorithm design for the professional. Based on the low-power multiband Orthogonal Frequency Division Multiplexing (OFDM) Ultra Wideband (UWB) system, the book gives a comprehensive and in-depth analysis in the technologies of UWB and Cognitive Radio, formulates the spectrum efficiency maximization problem into a multidimensional multi-knapsack problem, and provides a solution to the optimization problem by creating three novel low-complexity algorithms for spectrum sensing and spectrum management. Simulations and mathematical analysis show that the new algorithms significantly increase the spectrum efficiency of the low-power UWB-based cognitive radio system with very low cost compared with the conventional radio resource allocation algorithms, such as water-filling and Hughes-Hartogs algorithm. The book provides a solid foundation for the future study in large-extent and high-density multiuser cognitive radio networks, which can fully explore the benefits of cognitive radio technology.

Author: Shweta Pandit
Publisher: Springer
ISBN: 3319531476
Category : Technology & Engineering
Languages : en
Pages : 270

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Book Description
This book discusses the use of the spectrum sharing techniques in cognitive radio technology, in order to address the problem of spectrum scarcity for future wireless communications. The authors describe a cognitive radio medium access control (MAC) protocol, with which throughput maximization has been achieved. The discussion also includes use of this MAC protocol for imperfect sensing scenarios and its effect on the performance of cognitive radio systems. The authors also discuss how energy efficiency has been maximized in this system, by applying a simple algorithm for optimizing the transmit power of the cognitive user. The study about the channel fading in the cognitive user and licensed user and power adaption policy in this scenario under peak transmit power and interference power constraint is also present in this book.

Author: Menatalla Diaaeldin Shehabeldin
Publisher:
ISBN:
Category : Cognitive radio networks
Languages : en
Pages : 86

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Book Description
"Spectrum management is one of the most important elements of the overall design of cognitive radio systems. Primary users (PUs), or license holders, should not be affected by the opportunistic use of the spectrum by the secondary users (SUs). Moreover, secondary users, or the non-license holders, should try to maximize their utilization of free channels for better spectrum efficiency. The decision whether to access a channel or not is crucial to both the primary and secondary users. In this thesis, an improved spectrum access algorithm is proposed for cognitive radio systems by modeling the primary user channel usage pattern as a Hidden Markov Model (HMM). The proposed algorithm maximizes the channel utilization without causing significant interference to the primary user by considering access based on the availability of the channel at the current time slot. The decision on the availability of the channel is investigated using three machine learning techniques, namely HMMs, polynomial classifiers and nonlinear autoregressive with exogenous inputs (NARX) models. Simulation results based on models from real spectrum measurements show that using the conventional HMMdecoding technique leads to high collision probabilities of around 25%. On the other hand, using polynomial classifiers for deciding the availability of the channel enhances the system performance significantly, with collision probabilities less than 1%, while maintaining high utilization probabilities. A thorough investigation of the effect of the order of the polynomial classifier shows that while lower orders reduce the computational complexity of the algorithm, higher orders are more robust to high levels of shadowing. Another approach to mitigate the effect of shadowing is using cooperative spectrum sensing, where multiple SUs send the sensing results to a fusion center, which makes a global decision about the availability of the channel. Results show that the decision based on the scores of the classifiers outperforms majority vote in terms of collision and utilization probabilities."--Abstract.

Author: Anandakumar Haldorai
Publisher: Springer
ISBN: 3030154165
Category : Technology & Engineering
Languages : en
Pages : 229

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Book Description
This book highlights the need for an efficient Handover Decision (HD) mechanism to perform switches from one network to another and to provide unified and continuous mobile services that include seamless connectivity and ubiquitous service access. The author shows how the HD involves efficiently combining handover initiation and network selection process. The author describes how the network selection decision is a challenging task that is a central component to making HD for any mobile user in a heterogeneous environment that involves a number of static and dynamic parameters. The author also discusses prevailing technical challenges like Dynamic Spectrum Allocation (DSA) methods, spectrum sensing, cooperative communications, cognitive network architecture protocol design, cognitive network security challenges and dynamic adaptation algorithms for cognitive system and the evolving behavior of systems in general. The book allows the reader to optimize the sensing time for maximizing the spectrum utilization, improve the lifetime of the cognitive radio network (CRN) using active scan spectrum sensing techniques, analyze energy efficiency of CRN, find a secondary user spectrum allocation, perform dynamic handovers, and use efficient data communication in the cognitive networks. Identifies energy efficient spectrum sensing techniques for Cooperative Cognitive Radio Networks (CRN); Shows how to maximize the energy capacity by minimizing the outage probability; Features end-of-chapter summaries, performance measures, and case studies.

Author: Zhe Wang
Publisher: Springer
ISBN: 3319155423
Category : Technology & Engineering
Languages : en
Pages : 70

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Book Description
This Springer Brief investigates spectrum sharing with limited channel feedback in various cognitive radio systems, such as point-to-point, broadcast scheduling and ad-hoc networks. The design aim is to optimally allocate the secondary resources to improve the throughput of secondary users while maintaining a certain quality of service for primary users. The analytical results of optimal resource allocation are derived via optimization theory and are verified by the numerical results. The results demonstrate the secondary performance is significantly improved by limited feedback and is further improved by more feedback bits, more secondary receivers and more primary side information.

Author: Prabhat Thakur
Publisher: John Wiley & Sons
ISBN: 1119665426
Category : Technology & Engineering
Languages : en
Pages : 388

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Book Description
SPECTRUM SHARING IN COGNITIVE RADIO NETWORKS Discover the latest advances in spectrum sharing in wireless networks from two internationally recognized experts in the field Spectrum Sharing in Cognitive Radio Networks: Towards Highly Connected Environments delivers an in-depth and insightful examination of hybrid spectrum access techniques with advanced frame structures designed for efficient spectrum utilization. The accomplished authors present the energy and spectrum efficient frameworks used in high-demand distributed architectures by relying on the self-scheduled medium access control (SMC-MAC) protocol in cognitive radio networks. The book begins with an exploration of the fundamentals of recent advances in spectrum sharing techniques before moving onto advanced frame structures with spectrum accessing approaches and the role of spectrum prediction and spectrum monitoring to eliminate interference. The authors also cover spectrum mobility, interference, and spectrum management for connected environments in substantial detail. Spectrum Sharing in Cognitive Radio Networks: Towards Highly Connected Environments offers readers a recent and rational theoretical mathematical model of spectrum sharing strategies that can be used for practical simulation of future generation wireless communication technologies. It also highlights ongoing trends, revealing fresh research outcomes that will be of interest to active researchers in the area. Readers will also benefit from: An inclusive study of connected environments, 3GPP Releases, and the evolution of wireless communication generations with a discussion of advanced frame structures and access strategies in cognitive radio networks A treatment of cognitive radio networks using spectrum prediction and monitoring techniques An analysis of the effects of imperfect spectrum monitoring on cognitive radio networks An exploration of spectrum mobility in cognitive radio networks using spectrum prediction and monitoring techniques An examination of MIMO-based CR-NOMA communication systems for spectral and interference efficient designs Perfect for senior undergraduate and graduate students in Electrical and Electronics Communication Engineering programs, Spectrum Sharing in Cognitive Radio Networks: Towards Highly Connected Environments will also earn a place in the libraries of professional engineers and researchers working in the field, whether in private industry, government, or academia.

Author: Ekram Hossain
Publisher: Springer Science & Business Media
ISBN: 0387688323
Category : Technology & Engineering
Languages : en
Pages : 459

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Book Description
This book provides a unified view on the state-of-the-art of cognitive radio technology. It includes a set of research and survey articles featuring the recent advances in theory and applications of cognitive radio technology for the next generation (e.g., fourth generation) wireless communication networks. The contributed articles cover both the theoretical concepts (e.g., information-theoretic analysis) and system-level implementation issues.

Author: Alexander M. Wyglinski
Publisher: Academic Press
ISBN: 0080879322
Category : Technology & Engineering
Languages : en
Pages : 737

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Book Description
Cognitive Radio Communications and Networks gives comprehensive and balanced coverage of the principles of cognitive radio communications, cognitive networks, and details of their implementation, including the latest developments in the standards and spectrum policy. Case studies, end-of-chapter questions, and descriptions of various platforms and test beds, together with sample code, give hands-on knowledge of how cognitive radio systems can be implemented in practice. Extensive treatment is given to several standards, including IEEE 802.22 for TV White Spaces and IEEE SCC41 Written by leading people in the field, both at universities and major industrial research laboratories, this tutorial text gives communications engineers, R&D engineers, researchers, undergraduate and post graduate students a complete reference on the application of wireless communications and network theory for the design and implementation of cognitive radio systems and networks Each chapter is written by internationally renowned experts, giving complete and balanced treatment of the fundamentals of both cognitive radio communications and cognitive networks, together with implementation details Extensive treatment of the latest standards and spectrum policy developments enables the development of compliant cognitive systems Strong practical orientation – through case studies and descriptions of cognitive radio platforms and testbeds – shows how real world cognitive radio systems and network architectures have been built Alexander M. Wyglinski is an Assistant Professor of Electrical and Computer Engineering at Worcester Polytechnic Institute (WPI), Director of the WPI Limerick Project Center, and Director of the Wireless Innovation Laboratory (WI Lab) Each chapter is written by internationally renowned experts, giving complete and balanced treatment of the fundamentals of both cognitive radio communications and cognitive networks, together with implementation details Extensive treatment of the latest standards and spectrum policy developments enables the development of compliant cognitive systems Strong practical orientation – through case studies and descriptions of cognitive radio platforms and testbeds – shows how "real world" cognitive radio systems and network architectures have been built

Author: Shaowei Wang
Publisher: Springer
ISBN: 3319089366
Category : Computers
Languages : en
Pages : 109

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Book Description
This SpringerBrief presents a survey of dynamic resource allocation schemes in Cognitive Radio (CR) Systems, focusing on the spectral-efficiency and energy-efficiency in wireless networks. It also introduces a variety of dynamic resource allocation schemes for CR networks and provides a concise introduction of the landscape of CR technology. The author covers in detail the dynamic resource allocation problem for the motivations and challenges in CR systems. The Spectral- and Energy-Efficient resource allocation schemes are comprehensively investigated, including new insights into the trade-offs for operating strategies. Promising research directions on dynamic resource management for CR and the applications in other wireless communication systems are also discussed. Cognitive Radio Networks: Dynamic Resource Allocation Schemes targets computer scientists and engineers working in wireless communications. Advanced-level students in computer science and electrical engineering will also find this brief useful reading about the next generation of wireless communication.

Author: Suriyan, Kannadhasan
Publisher: IGI Global
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 309

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Book Description
As wireless services rapidly expand, the inefficient use of limited spectrum resources poses a critical challenge. The conventional approach to spectrum allocation, based on fixed assignments, could be more effective in meeting the escalating demand for wireless devices and systems. Cognitive radio technology offers a transformative solution by reimagining the spectrum as a multidimensional space, enabling opportunistic access to underutilized bands. However, the field of cognitive radio is still in its early stages, needing more in-depth analyses and descriptions of crucial processes. Spectrum and Power Allocation in Cognitive Radio Systems addresses this pressing need by offering a comprehensive guide for academic scholars, researchers, and industry professionals. This book delves into cognitive radio technology's foundations, organization, and challenges, providing insights into dynamic spectrum access, networking protocols, hardware architecture, and emerging applications. It presents advanced topics such as spectrum sensing algorithms, cooperative spectrum sensing, and multi-user access, offering practical solutions to enhance spectrum efficiency.