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Title Page
Abstract
요약
Contents
Abbreviations 14
Chapter 1. Introduction 17
1.0.1. Peak to Average Power Ratio 18
1.0.2. Out-of-Band Emissions 20
1.1. Chapters Contribution 21
1.1.1. Chapter 2: CPM Based OFDM 21
1.1.2. Chapter 3: Modified SIM-OFDM with CE and SW 21
1.1.3. Chapter 4: Multi-antenna Based Non-Orthogonal Multiple Access 22
Chapter 2. Continuous Phase Modulation Based OFDM 23
2.1. Fundamentals of CPM 24
2.1.1. Previous work 25
2.3. CPM Based OFDM 25
2.2.1. Transmitter 25
2.2.2. PAPR Analysis 26
2.2.3. Receiver 28
2.2.4. Effect of PAPR on BER Performance 28
2.3. Numerical Results 29
2.3.1. PAPR Numerical Results 30
2.3.2. BER vs PAPR 31
2.3.3. Bit Error Rate Performance 31
Chapter 3. Modified Subcarrier Index OFDM with Constellation Expansion and Subcarrier weighting 36
3.1. Modified Subcanier Index OFDM 36
3.2. OOB Emissions Reduction 39
3.2.1. Subcarrier Weighting (SW) Technique 41
3.2.2. Constellation Expansion (CE) Technique 41
3.3. Proposed SW and CE based Algorithm 42
3.4. PAPR Analysis 44
3.5. Analytical BER calculation 48
3.5.1. Analytical BER of Subcarrier Activity 49
3.5.2. Analytical Bit Error Probability of Estimating Bits of Changed Subcarriers 50
3.5.3. Analytical Bit Error Probability of Unchanged Subcarriers 51
3.5.4. Analytical Bit Error Probability 51
3.6. Analytical and Simulation Results 51
Chapter 4. Spatially Shifted Space Time Block Coded Non orthogonal Multiple Access 54
4.1. Non-Orthogonal Multiple Access (NOMA) 55
4.2. Proposed Scheme 55
4.2.1. Energy Efficiency 57
4.2.2. Correlation Based Detector for Transmit Antenna Index Estimation 57
4.2.2.1. Bit Error Probability 58
4.3. Simulation Results 59
4.4. Conclusion 59
Chapter 5. Conclusion 62
Bibliography 63
Table 2.1: PAPR statistics 31
Table 2.2: Required IBO from CDF plot 31
Table 2.3: Tap delay line models for Ped-A and Veh-A Channel 33
Table 4.1: NOMA-STBC Symbol mapping to transmit antennas 59
Figure 1.1: Frequency Division Multiplexing and Orthogonal Frequency Division Multiplexing 18
Figure 1.2: OFDM Block Diagram 18
Figure 1.3: Frequency Response of Filter 20
Figure 2.1: CPM-OFDM block diagram 24
Figure 2.2: PAPR,CDF plots of scheme 1, scheme 2, and conv-OFDM 30
Figure 2.3: AM/AM, Response of HPA for different input saturation levels 32
Figure 2.4: Effect of PAPR on BER, under constant SNR of 10dB 33
Figure 2.5: BER plots of Scheme 1, Scheme 2 and conv-OFDM in AWGN channel 34
Figure 2.6: BER plots of Scheme 1, Scheme 2 and conv-OFDM in Ped_A channel 34
Figure 2.7: BER plots of Scheme 1, Scheme 2 and conv-OFDM in Veh-A channel 35
Figure 3.1: Modified SIM-OFDM 37
Figure 3.2: Constellation Expansion example 40
Figure 3.3: Example of subcarriers with subcarrier weighting and constellation expansion 40
Figure 3.4: Resultant constellation points after Constellation Expansion and subcarrier weighting 42
Figure 3.5: power spectral density comparison of conventional, SIM-OFDM and modified SIM-OFDM 52
Figure 3.6: BER vs SNR, Theoretical and Simulation performance 52
Figure 3.7: PAPR,CDF plots of Conventional, SIM-OFDM, and modified SIM-OFDM 53
Figure 4.1: Block diagram of spatially shifted STBC-NOMA. 56
Figure 4.2: Ergodic sum rates of proposed and conv NOMA with 8 users. 60
Figure 4.3: SNR vs BER performance of proposed and MRRC detector 60
Figure 4.4: Energy efficiency comparison of NOMA, OMA,and NOMA-SSK 61
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