协作通信中的跨层设计（博士论文）

liuwei_0613

TABLE OF CONTENTS
List of Tables ix
List of Figures x
1 Introduction 1
1.1 The Wireless Channel . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1.1 Performance Characterization of Fading Channels . . . . . . 3
1.2 Combating Channel Fading: Diversity . . . . . . . . . . . . . . . . 5
1.3 Cooperative Diversity . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 Dissertation Outline . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.4.1 Multi-node Cooperative Communications (Chapter 2) . . . . 11
1.4.2 Relay-Assignment Protocols for Coverage Extension (Chapter
3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.4.3 Cognitive Cooperative Multiple Access (Chapter 4) . . . . . 12
1.4.4 Energy Efficiency of Cooperative Communications (Chapter
5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2 Multinode Cooperative Communications 15
2.1 System Model and Protocol Description . . . . . . . . . . . . . . . 16
2.2 Exact SER Performance Analysis . . . . . . . . . . . . . . . . . . . 20
2.2.1 Exact SER for General Cooperation Scheme . . . . . . . . . 21
2.2.2 Verifying the Validity of our Theoretical Model for Selective
Relaying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.3 Approximate SER Expression . . . . . . . . . . . . . . . . . . . . . 28
2.3.1 SER Approximation for General Cooperative Protocol . . . 28
2.3.2 Diversity order and Cooperation Gain . . . . . . . . . . . . 34
2.3.3 Bandwidth efficiency versus Diversity Gain . . . . . . . . . . 36
2.4 Optimal Power Allocation . . . . . . . . . . . . . . . . . . . . . . . 39
2.4.1 Single-Relay Scenario . . . . . . . . . . . . . . . . . . . . . . 44
2.4.2 Networks with linear topologies . . . . . . . . . . . . . . . . 45
2.4.3 Relays located near the source or the destination . . . . . . 47
2.4.4 Numerical Examples . . . . . . . . . . . . . . . . . . . . . . 49
3 Relay Assignment Protocols for Coverage Expansion 53
3.1 System Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.2 Relay Assignment: Protocols and Analysis . . . . . . . . . . . . . . 57
3.2.1 Direct Transmission . . . . . . . . . . . . . . . . . . . . . . . 58
3.2.2 Cooperative Transmission: Conditional Outage Probability . 58
3.2.3 Optimal Relay Position . . . . . . . . . . . . . . . . . . . . . 60
3.3 Relay Assignment Algorithms . . . . . . . . . . . . . . . . . . . . . 63
3.3.1 Nearest-Neighbor Protocol . . . . . . . . . . . . . . . . . . . 63
3.3.2 Fixed Relays Strategy . . . . . . . . . . . . . . . . . . . . . 66
3.3.3 Lower Bound on the Performance: The Genie-aided algorithm:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
3.4 Numerical Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
4 Cognitive Cooperative Multiple-Access 76
4.1 System Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
4.2 Cooperative Cognitive Multiple Access (CCMA) Protocols . . . . . 85
4.2.1 CCMA-Single frame (CCMA-S) . . . . . . . . . . . . . . . . 86
4.2.2 CCMA-Multiple frames (CCMA-M) . . . . . . . . . . . . . . 87
4.3 Stability Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
4.3.1 Stability Analysis of CCMA-S . . . . . . . . . . . . . . . . . 89
4.3.2 Stability Analysis of CCMA with multiple frames (CCMA-M) 99
4.3.3 Existing Cooperation Protocols: Stability Analysis . . . . . 105
4.3.4 Numerical Results . . . . . . . . . . . . . . . . . . . . . . . 110
4.4 Throughput Region . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
4.5 Delay Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
4.5.1 Delay Performance for CCMA-S . . . . . . . . . . . . . . . . 118
4.5.2 Delay Performance of CCMA-Me . . . . . . . . . . . . . . . 121
4.5.3 Numerical Results for Delay Performance . . . . . . . . . . . 122
5 On the Energy Efficiency of Cooperative Communications 133
5.1 System Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
5.2 Performance Analysis and Optimum Power Allocation . . . . . . . . 138
5.2.1 Direct Transmission . . . . . . . . . . . . . . . . . . . . . . . 139
5.2.2 Cooperative Transmission . . . . . . . . . . . . . . . . . . . 140
5.3 Multi-Relay Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . 145
5.4 Experimental and Simulation Results . . . . . . . . . . . . . . . . . 148
5.4.1 Experimental Results . . . . . . . . . . . . . . . . . . . . . . 148
5.4.2 Simulation Results . . . . . . . . . . . . . . . . . . . . . . . 151
6 Conclusions and Future Work 158
6.1 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
6.2 Future Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
6.2.1 Cooperation among Correlated Sources . . . . . . . . . . . . 161
6.2.2 Cognitive Cooperative Communications . . . . . . . . . . . . 162
Bibliography                                                                                162

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