tailieunhanh - Advance in Cognitive Radio Systems

In the latest years much research effort was devoted to envision a new paradigm for wireless transmission. Results from recent works (Wireless Word Research Forum, 2005) indicate that a possible solution would lie in utilizing in a more efficient manner the diverse Radio Access Technologies1 (RATs) that are available nowadays, with the purpose of enabling interoperability among them and convergence into one global telecom infrastructure (beyond 3G). Turning such a representation into reality requires endowing both the network and the user terminal with advanced management functionalities to ensure an effective utilization of radio resources. From the network providers’ side, this. | ADVANCES IN ADVANCES IN COGNITIVE RADIO SYSTEMS Edited by Cheng-Xiang Wang and Joseph Mitola III Advances in Cognitive Radio Systems Edited by Cheng-Xiang Wang and Joseph Mitola III Published by InTech Janeza Trdine 9 51000 Rijeka Croatia Copyright 2012 InTech All chapters are Open Access distributed under the Creative Commons Attribution license which allows users to download copy and build upon published articles even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. After this work has been published by InTech authors have the right to republish it in whole or part in any publication of which they are the author and to make other personal use of the work. Any republication referencing or personal use of the work must explicitly identify the original source. As for readers this license allows users to download copy and build upon published chapters even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. Notice 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 chapters. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials instructions methods or ideas contained in the book. Publishing Process Manager Bojan Rafaj Technical Editor Teodora Smiljanic Cover Designer InTech Design Team First published July 2012 Printed in Croatia A free online edition of this book is available at Additional hard copies can be obtained from orders@ Advances in Cognitive Radio Systems Edited by Cheng-Xiang Wang and Joseph Mitola III p. cm. ISBN .