Title page
Abstract
Contents
I. Introduction 12
1.1 OFDM Systems 13
1.1.1 OFDM History 13
1.1.2 OFDM Sytems 14
1.2 Dynamic Resource Allocation 16
1.2.1 Power Control 16
1.2.2 Channel Allocation 17
1.3 Motivation 19
1.4 Organization 21
II. Throughput Maximization and Fairness in OFDMA Systems 22
2.1 System Model 22
2.1.1 System Overview 22
2.1.2 Variable Definition and Parameters 24
2.2 Throughput Maximization 26
2.3 Fairness 27
2.3.1 Fairness Categories 27
2.3.2 Fairness Measure 28
2.4 Throughput Maximization and Fairness 29
III. Proposed Schemes 31
3.1 A Fair DRA Algorithm with Equal-Power Method 31
3.1.1 Proportional Fairness Scheduling 31
3.1.2 Subcarrier-and-Bit Allocation Algorithm 32
3.1.3 Performance Evaluation 36
3.2 A Fair DRA Algorithm with Water-Filling Method 41
3.2.1 Subcarrier-and-Bit Allocation Algorithm 42
3.2.2 Performance Evaluation 43
3.3 Proportional Fairness with QoS Pro-vision 46
3.3.1 Problem Formulation and Sub-Optimal Solution 47
3.3.2 Proposed Algorithm 50
3.3.3 Performance Evaluation 52
IV. Conclusions and Future work 55
References 57
Acknowledgement 60
[Figure 1.1] Bandwidth utilization comparison for FDM and OFDM 13
[Figure 1.2] Block diagram of an OFDM system 14
[Figure 2.1] Downlink configuration of OFDMA system with subcarrier and bit allocation 23
[Figure 3.1] Subcarrier Allocation 33
[Figure 3.2] User behavior in the cell 36
[Figure 3.3] System fairness vs. number of users 39
[Figure 3.4] System throughput vs. number of users 39
[Figure 3.5] System throughput degradation vs. number of users 40
[Figure 3.6] Probability of outage vs. number of users 40
[Figure 3.7] System fairness vs. number of users 43
[Figure 3.8] System throughput vs. number of users 44
[Figure 3.9] System throughput degradation vs. number of users 44
[Figure 3.10] Probability of outage vs. number of users 45
[Figure 3.11] System fairness vs. number of users 53
[Figure 3.12] System throughput vs. number of users 53