Resource Allocation for OFDMA Systems (eBook)

Preface 6
Acknowledgements 8
Contents 9
Chapter 1: Introduction 12
1.1 OFDM/OFDMA Technology 12
1.2 Radio Resource Allocation Technology 13
1.3 The Organizational Structure 15
References 16
Chapter 2: Overview of OFDMA and MIMO Systems 17
2.1 Review 17
2.2 Channel Characteristics of Mobile Communication 18
2.2.1 Large-Scale Fading 18
2.2.2 Mesoscale Decline 19
2.2.3 Small-Scale Decline 19
2.2.4 Channel Interference 20
2.3 Multiuser MIMO 21
2.3.1 Signal Detection Method 23
2.3.2 Single-User Selection 24
2.3.3 Multiuser Selection 25
2.4 OFDMA System 27
2.4.1 OFDM Principle 27
2.4.2 Unicast and Multicast OFDMA Systems 29
References 31
Chapter 3: Remarks on Resource Allocation 33
3.1 Review 33
3.2 Dynamic Spectrum Sharing Model and Method Overview 34
3.2.1 Concept 34
3.2.2 Dynamic Spectrum Sharing Method and Classification 36
3.2.3 Current Research Hotspot 40
3.3 The Theory of OFDMA System Resource Allocation 41
3.3.1 Optimization Theory 42
Convex Optimization Problems 42
Linear Programming Problems 43
Integer Planning Problems 44
3.3.2 Optimal Solution Algorithm 44
The KKT (Karush-Kuhn-Tucker) Point for Optimization Problems 45
Gradient Method 46
Interior Point Method 46
Enumeration Algorithm 47
Branch-and-Bound Method 48
3.3.3 Suboptimal Solution Algorithm 49
Relaxation Constraint Algorithm 49
Duality Algorithm 49
Alternate Algorithm 50
Greedy Algorithm 51
References 52
Chapter 4: Resource Allocation for OFDMA Systems 53
4.1 Introduction 53
4.1.1 Resource Allocation for Multicast OFDMA Systems 53
4.1.2 Resource Allocation for MIMO-OFDMA Systems 54
4.1.3 Resource Allocation for Energy Efficiency in OFDMA Systems 55
4.2 Adaptive Resource Allocation for Multicast OFDMA Systems with Guaranteed BER and Rate 56
4.2.1 System Model and Problem Formulation 56
4.2.2 Optimal Algorithm 58
4.2.3 Suboptimal Algorithm 60
Bit Loading 61
Target Symbol Error Rate Adjusting 61
4.2.4 Simulation Results 65
4.2.5 Conclusion 68
4.3 Subcarrier and Power Allocation for Multiuser MIMO-OFDM Systems with Various Detectors 68
4.3.1 System Model and Problem Formulation 68
4.3.2 Subcarrier and Power Allocation 70
ML Detector 70
Linear Detector 72
SIC Detector 74
4.3.3 Simulation Results 75
4.3.4 Conclusion 79
4.4 Low-Complexity Energy-Efficient Subcarrier Assignment in Uplink OFDMA Systems 80
4.4.1 System Model and Problem Formulation 80
4.4.2 Energy-Efficient Subcarrier Assignment 81
Analysis of Energy Efficiency with Subcarriers 81
Energy-Efficient Subcarrier Assignment Algorithm 86
4.4.3 Simulation Results 88
4.4.4 Conclusion 89
4.5 Summary 89
References 90
Chapter 5: Dealing with Imperfect CSI 92
5.1 Introduction 92
5.2 Channel Model with Imperfect CSI 94
5.2.1 Nosie and Estimation Error 94
5.2.2 CSI Feedback Delay 95
5.2.3 Finite-Rate Feedback of Downlink CSI 97
5.3 Downlink Ergodic Throughput Maximization for OFDMA Systems with Feedback Channel Capacity Constraints 99
5.3.1 Problem Formulation 99
5.3.2 Optimal Solution 100
5.3.3 Suboptimal Algorithm 101
Subcarrier Allocation 101
Power Allocation 101
5.3.4 Simulation Results 102
5.3.5 Conclusion 103
5.4 Resource Allocation for Maximizing Outage Throughput in OFDMA Systems with Finite-Rate Feedback 103
5.4.1 Problem Formulation 103
5.4.2 Upper Bound of the Optimal Solution 105
5.4.3 Suboptimal Solution 106
Subcarrier Algorithm 106
Power Allocation 107
5.4.4 Simulation Results 108
5.4.5 Conclusion 110
5.5 Resource Allocation for OFDMA Systems with Guaranteed Outage Probabilities 110
5.5.1 Problem Formulation 110
5.5.2 Optimal Solution 111
5.5.3 Suboptimal Solution 111
Subcarrier Allocation 112
Power Allocation 113
5.5.4 Simulation Results 114
5.5.5 Conclusion 117
5.6 Energy Efficiency Maximization for Downlink OFDMA Systems with Feedback Channel Capacity Constraints 117
5.6.1 Problem Formulation 117
5.6.2 Energy-Efficient Resource Allocation with Quantized CSI 119
5.6.3 Simulation Results 123
5.6.4 Conclusion 125
5.7 Resource Allocation for Physical-layer Security in OFDMA Downlink with Imperfect CSI 125
5.7.1 System Model and Problem Formulation 125
5.7.2 Optimal Power Allocation Algorithm When Subcarrier Assignment Is Fixed 129
5.7.3 Greedy Subcarrier Allocation Algorithm 132
5.7.4 Simulation Results 134
5.7.5 Conclusion 136
5.8 Summary 137
References 137
Summary and Outlook 139
Summary 139
Outlook 140