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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/85172完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 鐘嘉德(Char-Dir Chung),陳維昌(Wei-Chang Chen) | |
| dc.contributor.author | Chang-Hung Lu | en |
| dc.contributor.author | 盧長宏 | zh_TW |
| dc.date.accessioned | 2023-03-19T22:48:05Z | - |
| dc.date.copyright | 2022-10-12 | |
| dc.date.issued | 2022 | |
| dc.date.submitted | 2022-08-08 | |
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[74] 3GPP TS 38.212 V15.0.0, NR; Multiplexing and channel coding, Jul. 2020. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/85172 | - |
| dc.description.abstract | 正交時頻空間 (orthogonal time frequency space; OTFS) 系統為一種高效的多載波調變技術，用於具雙重選擇性通道 (doubly selective channels) 上作數據幀之傳輸，此通道有著顯著的都卜勒及延遲擴散效應。透過擴散數據符元至時間-頻率域，OTFS系統相較於正交分頻多工 (orthogonal frequency-division multiplexing; OFDM) 等傳統的多載波調變技術，其能夠利用多路徑分集並對延遲-都卜勒位移有著適應性及穩健性。當矩形脈波被採用為整形脈波時，OTFS可有效地透過由OFDM區塊訊號組成之幀訊號來實現傳輸，並且於都卜勒變化之通道色散環境下其錯誤性能優於OFDM。然而，由於矩形脈波的不連續性，矩形脈波的OTFS受到以f^-2衰減的大功率頻譜旁波瓣影響，從而造成鬆散的功率頻譜。在本篇論文中，具I級冗餘之頻譜預編碼結合矩形脈波的OTFS使得頻譜緊密有著較小的旁波瓣以f^-2I-2或更快的衰減。關於頻譜預編碼式OTFS (spectrally-precoded OTFS; SP-OTFS) 的峰均功率比 (peak-to-average power ratio; PAPR)、可實現的數據速率(achievable data rate; ADR)、頻譜效率 (spectral efficiency) 和等化符元決策等特性亦於本篇論文中作了研究與探討。 | zh_TW |
| dc.description.abstract | Orthogonal time frequency space (OTFS) is a power-efficient multicarrier modulation for data frame transmission over doubly dispersive channels exhibiting large Doppler spread and sparse delay spread. By spreading data symbols in the time-frequency domain, the OTFS system enables the exploitation of diversity in multipath components and is thus resilient and robust to delay-Doppler shifts, when compared with traditional multicarrier modulation schemes like orthogonal frequency-division multiplexing (OFDM). When rectangular pulse is adopted as the shaping pulse, OTFS can be practically and efficiently signaled by a frequency-space precoded frame of OFDM block signals and outperforms OFDM in error performance over Doppler-variant channel dispersion. However, due to the discontinuity in rectangular pulse, the rectangularly-pulsed OFDM-based OFTS suffers large power spectral sidelobes decaying slowly as f^-2 and thus renders loose power spectrum. In this thesis, spectral precoding with a level-I redundancy is integrated with rectangularly-pulsed OFDM-based OTFS to make the compact power spectrum rendering small sidelobes decaying as f^-2I-2 or faster. The characteristics of peak-to-average power ratio, achievable data rate, spectral efficiency, and equalized symbol decision are also investigated for the proposed spectrally-precoded OTFS scheme. | en |
| dc.description.provenance | Made available in DSpace on 2023-03-19T22:48:05Z (GMT). No. of bitstreams: 1 U0001-0408202211131700.pdf: 4962151 bytes, checksum: 1734f5910d880695eb3b7044def30670 (MD5) Previous issue date: 2022 | en |
| dc.description.tableofcontents | Abstract i Contents ii List of Figures iii List of Tables iv 1 Introduction 1 1.1 Review of OTFS Concept, Waveform and System 1 1.2 Review of OTFS Data Decision Methods 4 1.3 Review of OTFS PAPR Reduction Methods 7 1.4 Review of Spectral Sidelobe Suppressions 9 1.5 Thesis Motivation and Contributions 10 1.6 Notations 11 2 System Model and Fast sidelobe Decaying Constraints 13 2.1 System and Signal Model 13 2.2 Fast Sidelobe Decaying Constraints 18 3 Design of OTFS Spectral Precoders 22 3.1 Design of Spectral Precoding Matrix 22 3.2 Design of Spectral Precoders with PAPR Reduction 27 3.3 Numerical and Simulation Results 29 3.3.1 Power Spectral Compactness Characteristics 29 3.3.2 PAPR Characteristics 31 3.4 Chapter Summary 32 4 Coherent Receiver Architecture, Spectral Efficiency and Detection 36 4.1 OTFS Receiver Architecture 36 4.2 Achievable Data Rate 41 4.3 Equalization-Aided Symbol Decision 45 4.3.1 Low-Complexity Time Domain Equalization 45 4.3.2 Delay-Dopper Domain Symbol Decision 48 4.4 Symbol Decision Performance Analysis 49 4.5 Numerical and Simulation Results 51 4.5.1 Channel Parameters Setting 51 4.5.2 Achievable Data Rate and Spectral Efficiency Characteristics 52 4.5.3 Equalized Symbol Decision Characteristic 55 4.6 Complexity Analysis 60 4.6.1 Symbol Decision Operation Complexity 60 4.6.2 Symbol Decision Performance Analysis Complexity 60 4.7 Chapter Summary 61 5 Conclusion 63 Bibliography 64 6 Appendix 73 6.1 Appendix A. Proof That U is Orthogonal and Meets Equation 73 6.2 Appendix B. Derivation of (3.5) and (3.6) 75 6.3 Appendix C. Derivation of (4.16) 76 | |
| dc.language.iso | en | |
| dc.subject | 頻譜效率 | zh_TW |
| dc.subject | 正交時頻空間調變 | zh_TW |
| dc.subject | 雙重選擇性通道 | zh_TW |
| dc.subject | 頻譜預編碼 | zh_TW |
| dc.subject | 旁波瓣抑制 | zh_TW |
| dc.subject | orthogonal time frequency space modulation | en |
| dc.subject | spectral efficiency | en |
| dc.subject | sidelobe suppression | en |
| dc.subject | spectral precoding | en |
| dc.subject | doubly dispersive channel | en |
| dc.title | OTFS系統中的頻譜預編碼式帶外功率降低法 | zh_TW |
| dc.title | Spectral Precoding for Out-of-Band Power Reduction in OTFS Systems | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 110-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王晉良(Chin-Liang Wang),古孟霖(Meng-Lin Ku),李穎(Ying Li) | |
| dc.subject.keyword | 正交時頻空間調變,雙重選擇性通道,頻譜預編碼,旁波瓣抑制,頻譜效率, | zh_TW |
| dc.subject.keyword | orthogonal time frequency space modulation,doubly dispersive channel,,spectral precoding,sidelobe suppression,spectral efficiency, | en |
| dc.relation.page | 77 | |
| dc.identifier.doi | 10.6342/NTU202202046 | |
| dc.rights.note | 同意授權(限校園內公開) | |
| dc.date.accepted | 2022-08-08 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
| dc.date.embargo-lift | 2024-08-08 | - |
| 顯示於系所單位： | 電信工程學研究所 | |
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