Proactive Frequency-Hopping Dynamic Spectrum Access to Reduce Interference against Asynchronous Inter-Channel Spectrum Sensing

Title
Proactive Frequency-Hopping Dynamic Spectrum Access to Reduce Interference against Asynchronous Inter-Channel Spectrum Sensing
Authors
구준롱
Keywords
proactivefrequencyhoppingdynamicspectrumaccesstoreduceinterferenceagainstasynchronousinterchannelspectrumsensing
Issue Date
2012
Publisher
인하대학교
Abstract
In most of the current frequency hopping (FH) based dynamic spectrum access (DSA) methods, channel switching is reactively triggered by the return of primary user (PU) reported from spectrum sensing. When channel switching occurs, the candidate channel to be switched to is assumed exactly just sensed or ready to be sensed, i.e., the spectrum sensing moments of this candidate channel are synchronized. However, the corresponding asynchronous case is more universal but rarely considered. The asynchronous inter-channel spectrum sensing risks the current FH based DSA methods induce more interference to PU. Therefore, we propose an FH based DSA method to reduce interference against asynchronous inter-channel spectrum sensing and term it as proactive FH-DSA. The optimal FH policy is obtained by formulating our proposed method in the dynamic programming framework. Furthermore, we have identified the upper and lower bounds of the average interference time and the average delay corresponding to
Description
Chapter 1 Introduction 1 1.1 Background 1 1.2 Motivations 2 1.3 Dissertation Organization 3 Chapter 2 Introduction of Current Cognitive Radio Systems and Limitations 4 2.1 Overview of Cognitive Radio 4 2.1.1 Current Spectrum Sensing Methods 5 2.1.2 State of Art of Dynamic Spectrum Access (DSA) 7 2.2 The Limitations 7 2.2.1 The Limitations of Current Spectrum Sensing Methods 8 2.2.2 The Limitations of Current Dynamic Spectrum Access Methods 9 2.3 The Contributions 12 Chapter 3 Proactive FH-DSA to Reduce Interference against Asynchronous Inter-Channel Spectrum Sensing 13 3.1 General Description of Proactive FH-DSA 13 3.2 Formulation of Cross Entropy Based Spectrum Sensing 14 3.2.1 Spectrum Sensing Modeling 14 3.2.2 Detection Performance Enhancements 17 3.2.3 Detection Performance over Entropy Based Spectrum Sensing 18 3.2.4 Likelihood Ratio and Cross Entropy 22 3.3 Formulation of Proactive FH-DSA 24 3.3.1 Preliminaries on PU Channel State E
URI
http://dspace.inha.ac.kr/handle/10505/23730
Appears in Collections:
College of Engineering(공과대학) > Graduate School of IT & Telecommunications (정보통신대학원) > Theses(정보통신대학원 석박사 학위논문)
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