Title Page
Contents
ABSTRACT 11
국문초록 12
CHAPTER 1. Introduction 13
CHAPTER 2. System Model and Problem Formulation 21
2.1. System Model 21
2.2. Intelligent Reflecting Surface and Subcarrier Allocation 23
2.2.1. Intelligent Reflecting Surface 23
2.2.2. OFDMA Subcarrier Allocation 25
CHAPTER 3. PROPOSED ITERATIVE ALGORITHM 27
3.1. Problem Formulation for OA Framework 27
3.2. Proposed Solution based on IA Method 31
3.2.1. Optimization of w and α with Given Φ 31
3.2.2. Optimization of Φ and with α Given w 34
3.2.3. Proposed Algorithm based on IA Method and AO Framework 36
3.2.4. Complexity Analysis 39
CHAPTER 4. Numerical Results 40
4.1. Performance Evaluation of The Proposed System and Existing Systems 41
4.2. Performance Evaluation of The Proposed System and Exhaustive Search 45
CHAPTER 5. Conclusions 47
REFERENCES 48
Table 1. Simulation results 40
Table 2. Comparison of complexity 45
Figure 2.1. A model of MU-MISO-OFDMA system using subcarrier allocation. 21
Figure 2.2. IRS-assisted wireless communications. 23
Figure 2.3. A model of OFDMA subcarrier allocation. 25
Figure 4.1. The convergence behavior of the SR. 41
Figure 4.2. Cumulative distribution function of the SR. 42
Figure 4.3. Average SR versus the power budget at the BS. 43
Figure 4.4. Average SR versus the QoS requirement. 44
Figure 4.5. Average SR versus the power budget at the BS (K=5, N=2, Nc=2, and M=30). 45