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研究生： 鄭丞桓
Cheng, Cheng-Huan
論文名稱： 下行速率分割多址復用技術在多路經和多普勒通道下之性能分析
Performance Analysis for Downlink Rate-Splitting Multiple Access in Doppler and delay channel
指導教授： 陳曉華
Chen, Hsiao-Hwa
學位類別： 碩士
Master
系所名稱： 工學院 - 工程科學系
Department of Engineering Science
論文出版年： 2025
畢業學年度： 113
語文別： 英文
論文頁數： 227
中文關鍵詞： 速率分割分多址 、非正交多址
外文關鍵詞： Rate-Splitting Multiple Access (RSMA), Non-orthogonal Mulplte Access (NOMA)
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    • 近年來，下行速率分割多址復用（RSMA） 系統受到廣泛關注，其核心優勢在於能夠將部分訊號視為干擾、部分視為雜訊，進而提升對干擾的彈性處理能力，並實現用戶間功率的靈活分配。然而，現有文獻多聚焦於理想通道或使用 OFDM 並搭配循環字首來處理多路徑效應，亦或應用於衛星等幾乎無多路徑影響的場景，對於 RSMA 系統在同時具備多路徑通道與 Doppler 效應之環境下的穩健性尚缺乏深入探討。因此，本文針對此一議題進行研究，並與多天線下行 NOMA 系統在不同通道條件下之效能進行比較，探討 RSMA 在實際無線傳輸環境中之應用潛力。

    In recent years, downlink Rate-Splitting Multiple Access (RSMA) has drawn increasing attention due to its ability to partially decode interference as useful signals while treating the rest as noise. This hybrid approach enables flexible interference management and dynamic power allocation among users. However, most existing studies focus on RSMA under idealized channels, or employ OFDM with cyclic prefix to mitigate multipath effects, or are applied in satellite systems where multipath is negligible. The robustness of RSMA under the simultaneous impact of multipath fading and Doppler effects remains largely unexplored. This paper investigates the performance of RSMA systems in such realistic environments and compares them with multi-antenna downlink NOMA systems, aiming to evaluate RSMA’s resilience and applicability in practical wireless scenarios.

    摘要 v Abstract vii Acknowledgements ix Table of Contents xi List of Tables xv List of Figures xvii List of Abbreviations xxv List of Symbols xxix Dedication xxxiii 1 Introduction 1 1.1 Background 1 1.1.1 The Related Works of RSMA 3 1.1.2 Motivations 8 1.1.3 The Advantages of RSMA 9 1.1.4 The Disadvantages of RSMA 10 1.2 A Brief Survey on Related Works 10 1.3 Thesis Organization 12 2 Overview of Rate-splitting Multiple Access Techniques 13 2.1 Introduction of NOMA 14 2.1.1 Superposition Coding(SC) 15 2.1.2 Successive Interference Cancellation(SIC) 16 2.1.3 NOMA with Multiple Antennas 18 2.2 Introduction of SDMA 19 2.2.1 Multiuser MIMO Precoding 20 2.2.2 Closed-Form Linear Precoder 21 2.3 Introduction of RSMA 22 2.3.1 The Principle of Downlink RS 24 2.3.2 The Principle of Uplink RS 27 2.3.2.1 Two Users Uplink NOMA 34 2.3.2.2 Two Users Uplink RSMA 34 3 Assumptions and Definitions of Rate Splitting Multiple Access system model and channel model 39 3.1 Channel Model 40 3.2 System Model of Downlink RSMA Assumptions and Definitions 44 3.3 System Model in Flat-Fading with Estimate Error Cause by Doppler 46 3.4 System Model with Multipath Transform into Toeplitz Form 48 3.5 The Toeplitz Channel with Estimation Error 52 4 Performance Analysis of Multiple Antennas Downlink Rate Splitting Multiple Access Techniques with Time-Invariant Channel 55 4.1 Toeplitz Channel Matrix in RSMA System With Time-Invariant Channel 56 4.1.1 The Precoding Design for Common Message in RSMA 61 4.1.2 The Precoding Design for Private Message in RSMA 66 4.2 Performance Analysis of Downlink RSMA with Time-Invariant Channel 70 4.3 Simulations for RSMA and NOMA with Time-Invariant Channel 79 4.3.1 Performance Comparisons Three Channel Model in Two Users Scenario in Time-Invariant Channel 80 4.3.2 Performance Comparisons Three Channel Model in Three Users Scenario in Time-Invariant Channel 87 4.3.3 Performance Comparisons Three Channel Model in Four Users Scenario in Time-Invariant Channel 92 5 Performance Analysis of Multiple Antennas Downlink Rate Splitting Multiple Access Techniques with Time-Variant Channel 97 5.1 Toeplitz Channel Matrix in RSMA System with Time-Variant Channel 98 5.1.1 The Precoding Design for Common Message in RSMA with Time-Variant Channel 101 5.1.2 The Precoding Design for Private Message in RSMA with Time-Variant Channel 105 5.2 Performance Analysis of Downlink RSMA with Time-Variant Channel 109 5.3 Simulations for RSMA and NOMA with Time-Variant Channel 113 5.3.1 Performance Comparisons Three Channel Model in Four Users Scenario in Time-Variant Channel 115 5.3.2 Impact of Power Allocation Between Common and Private Parts on RSMA Performance 119 5.3.3 Simulations for RSMA and NOMA with Different Velocity of User 121 6 Conclusions and Future Works 125 6.1 Conclusions 125 6.2 FutureWorks 126 References 129 A Uplink RSMA Analysis of Two Users Scenario with Different Decoding Order 137 B Downlink RSMA Private Precoding Scheme based on Multiuser MIMO to Mitigate Multiuser Interference 151 C The Downlink NOMA System Model 155 C.1 System Model of Downlink NOMA Assumptions and Definitions 155 C.2 System Model in Flat-Fading with Estimate Error Cause by Doppler in NOMA 157 D Performance Analysis of Multiple Antennas Downlink Non-Orthogonal Multiple Access Techniques with Time-Invariant Channel 159 D.1 Toeplitz Channel Matrix in NOMA System with Time-Invariant Channel 159 D.2 The Precoding Design For Each Group in NOMA with Time-Invariant Channel 165 D.3 Performance Analysis of Downlink NOMA with Time-Invariant Channel 171 E Performance Analysis of Multiple Antennas Downlink Non-Orthogonal Multiple Access Techniques with Time-Variant Channel 179 E.1 Toeplitz Channel Matrix in NOMA System with Time-Variant Channel 179 E.2 The Precoding Design For Each Group in NOMA with Time-Variant Channel 183 E.3 Performance Analysis of Downlink NOMA with Time-Variant Channel 189

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