Cognitive Radio Systems

I Cognitive Radio Systems Cognitive Radio Systems Edited by Wei Wang In-Tech intechweb.org Published by In-Teh In-Teh Olajnica 19/2, 32000 Vukovar, Croatia Abstracting and non-profit use of the material is permitted with credit to the source. Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published articles. Publisher assumes no responsibility liability for any damage or injury to persons or property arising out of the use of any materials, instructions, methods or ideas contained inside. After this work has been published by the In-Teh, authors have the right to republish it, in whole or part, in any publication of which they are an author or editor, and the make other personal use of the work. © 2009 In-teh www.intechweb.org Additional copies can be obtained from: publication@intechweb.org First published November 2009 Printed in India Technical Editor: Sonja Mujacic Cognitive Radio Systems, Edited by Wei Wang p. cm. ISBN 978-953-307-021-6 V Preface Cognitive radio is a hot research area for future wireless communications in the recent years. In order to increase the spectrum utilization, cognitive radio makes it possible for unlicensed users to access the spectrum unoccupied by licensed users. Cognitive radio let the equipments more intelligent to communicate with each other in a spectrum-aware manner and provide a new approach for the co-existence of multiple wireless systems. The goal of this book is to provide highlights of the current research topics in the field of cognitive radio systems. The book consists of 17 chapters, addressing various problems in cognitive radio systems. Chapter 1 ~ Chapter 3 introduce the concepts and the state-of-the-art strategies for cognitive radio systems. Chapter 4 ~ Chapter 6 focus on the spectrum sensing techniques for cognitive radio systems, including cooperative spectrum sensing, cyclostationary-based signal detection and sensing-based traffic pattern prediction. Chapter 7 ~ Chapter 10 provide some recent research achievements on the transmission tech-nologies. Two of them describe the interference related transmission, while the other two chapters study the multi-antenna transmission for cognitive radio systems. Chapter 11 ~ Chapter 15 present the efficient solutions for various resource allocation prob-lems, including MAC protocol, subband selection, power allocation, resource management and the transmission for multimedia services. Chapter 16 ~ Chapter 17 discuss some practical issues in cognitive radio systems. The plat-form for inter-radio system switching and the power amplification are investigated in the two chapters respectively. The editor appreciates the authors of the chapters for their contribution. We hope that this book will provide the readers an efficient way for understanding both the basic ideas of cogni-tive radio and the cutting-edge research results. Wei Wang Institute of Information and Communication Engineering Department of Information Science and Electronic Engineering Zhejiang University P.R. China ... - tailieumienphi.vn