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resource allocation in ofdm based cognitive two way relay networks
CHAPTER 1 INTRODUCTION1
1.1 Introduction1
1.2 Contributions2
1.3 Problem Definition and Motivation3
1.4 Objectives3
1.5 Literature Review4
1.6 Thesis Structure7
Bibliography8
CHAPTER TWO COGNITIVE RADIO SYSTEMS10
2.1 Introduction10
2.2 Cognitive Radio Network Characteristics11
2.2.1 Cognitive Capability12
2.2.2 Reconfigurability12
2.3 Network Architecture and Applications13
2.4 Cognitive Cycle14
2.4.1 Spectrum Sensing14
2.4.2 Spectrum Decision21
2.4.3 Spectrum Sharing21
2.4.4 Spectrum Mobility (Spectrum Handoff)24
2.5 Applications25
2.5.1 Public Safety Networks25
2.5.2 Disaster Relief and Emergency Networks25
Bibliography ...........27
CHAPTER THREE OFDM TECHNIQUE AND RELAYING NETWORKS30
3.1 Introduction30
3.2 Orthogonal Frequency Division Multiplexing (OFDM) System31
3.2.1 OFDM System Design and Benefits31
3.2.2 Peak to- Average Power Ratio33
3.2.3 OFDM Applications34
3.3 Relaying Networks34
3.3.1 One-Way Relay Networks35
3.3.2 Two-Way Relay Networks37
Bibliography ........39
CHAPTER FOUR RESOURCE ALLOCATION IN OFDM-BASED COGNITIVE TWO-WAY MULTIPLE-RELAY NETWORKS41
4.1 Introduction41
4.2 Constrained Optimization41
4.2.1 Duality Theory41
4.2.2 Time Sharing Condition43
4.2.3 Subgradient Method43
4.3 OFDM-Based CR Two-way Relay System Model and Problem Formulation45
4.3.1 System Model45
4.3.2 Problem Formulation48
4.4 Optimal Resource Allocation Based On Dual Method49
4.4.1 Optimal Resource Allocation49
4.4.2 Subgradient Method to Calculate the Optimal54
4.5 Suboptimal Algorithms55
4.5.1 Proposed Suboptimal Greedy Algorithm (Proposed Suboptimal) ..................55
4.5.2 Hungarian Pairing Suboptimal Algorithm (Suboptimal + Hungarian) ...........56
4.5.3 Fixed Pairing Suboptimal (Suboptimal + Fixed).............................................57
4.6 Complexity Computations57
4.7 Simulation Results58
Bibliography .....62
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