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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 林茂昭 | zh_TW |
| dc.contributor.advisor | Mao-Chao Lin | en |
| dc.contributor.author | 陳子齊 | zh_TW |
| dc.contributor.author | Zi-Qi Chen | en |
| dc.date.accessioned | 2025-10-08T16:05:43Z | - |
| dc.date.available | 2025-10-09 | - |
| dc.date.copyright | 2025-10-08 | - |
| dc.date.issued | 2025 | - |
| dc.date.submitted | 2025-08-11 | - |
| dc.identifier.citation | [1] R. Hadani et al., "Orthogonal Time Frequency Space Modulation," 2017 IEEE Wireless Communications and Networking Conference (WCNC), San Francisco, CA, USA, 2017, pp. 1-6, doi: 10.1109/WCNC.2017.7925924.
[2] P. Raviteja, Y. Hong, E. Viterbo and E. Biglieri, "Practical Pulse-Shaping Waveforms for Reduced-Cyclic-Prefix OTFS," in IEEE Transactions on Vehicular Technology, vol. 68, no. 1, pp. 957-961, Jan. 2019, doi: 10.1109/TVT.2018.2878891. [3] T. Thaj and E. Viterbo, "Orthogonal Time Sequency Multiplexing Modulation," 2021 IEEE Wireless Communications and Networking Conference (WCNC), Nanjing, China, 2021, pp. 1-7, doi: 10.1109/WCNC49053.2021.9417451. [4] T. Thaj, E. Viterbo and Y. Hong, "Orthogonal Time Sequency Multiplexing Modulation: Analysis and Low-Complexity Receiver Design," in IEEE Transactions on Wireless Communications, vol. 20, no. 12, pp. 7842-7855, Dec. 2021, doi: 10.1109/TWC.2021.3088479. [5] S. G. Neelam and P. R. Sahu, "Detection Techniques for SISO/MIMO-OTSM Systems with Hardware Impairments Under High Mobility Scenarios," 2024 National Conference on Communications (NCC), Chennai, India, 2024, pp. 1-6, doi: 10.1109/NCC60321.2024.10485695. [6] H. F. Harmuth, "Applications of Walsh functions in communications," in IEEE Spectrum, vol. 6, no. 11, pp. 82-91, Nov. 1969, doi: 10.1109/MSPEC.1969.5214175. [7] F. Lampel, A. Avarado and F. M. J. Willems, "On OTFS using the Discrete Zak Transform," 2022 IEEE International Conference on Communications Workshops (ICC Workshops), Seoul, Korea, Republic of, 2022, pp. 729-734, doi: 10.1109/ICCWorkshops53468.2022.9814589. [8] K. R. Murali and A. Chockalingam, "On OTFS Modulation for High-Doppler Fading Channels," 2018 Information Theory and Applications Workshop (ITA), San Diego, CA, USA, 2018, pp. 1-10, doi: 10.1109/ITA.2018.8503182. [9] P. Raviteja, K. T. Phan, Y. Hong and E. Viterbo, "Embedded Delay-Doppler Channel Estimation for Orthogonal Time Frequency Space Modulation," 2018 IEEE 88th Vehicular Technology Conference (VTC-Fall), Chicago, IL, USA, 2018, pp. 1-5, doi: 10.1109/VTCFall.2018.8690836. [10] B. Zhu and Z. Luo, "A High-Performance Block LMMSE Equalizer for OTFS-MIMO Diversity and Multiplexing," 2022 IEEE 8th International Conference on Computer and Communications (ICCC), Chengdu, China, 2022, pp. 928-932, doi: 10.1109/ICCC56324.2022.10065865. [11] X. Huang, A. Farhang and R. -R. Chen, "Channel Estimation and Turbo Equalization for Coded OTFS and OFDM: A Comparison," in IEEE Wireless Communications Letters, vol. 12, no. 9, pp. 1613-1617, Sept. 2023, doi: 10.1109/LWC.2023.3284778. [12] S. S. Das, V. Rangamgari, S. Tiwari and S. C. Mondal, "Time Domain Channel Estimation and Equalization of CP-OTFS Under Multiple Fractional Dopplers and Residual Synchronization Errors," in IEEE Access, vol. 9, pp. 10561-10576, 2021, doi: 10.1109/ACCESS.2020.3046487. [13] S. Sabapathy, J. S. Prabhu, S. Maruthu and D. N. K. Jayakody, "Profuse Channel Estimation and Signal Detection Techniques for Orthogonal Time Frequency Space in 6G Epoch: A Survey," in IEEE Access, vol. 11, pp. 129963-129993, 2023, doi: 10.1109/ACCESS.2023.3333428. [14] T. Thaj and E. Viterbo, "Low Complexity Iterative Rake Decision Feedback Equalizer for Zero-Padded OTFS Systems," in IEEE Transactions on Vehicular Technology, vol. 69, no. 12, pp. 15606-15622, Dec. 2020, doi: 10.1109/TVT.2020.3044276. [15] T. Thaj and E. Viterbo, "Low Complexity Iterative Rake Detector for Orthogonal Time Frequency Space Modulation," 2020 IEEE Wireless Communications and Networking Conference (WCNC), Seoul, Korea (South), 2020, pp. 1-6, doi: 10.1109/WCNC45663.2020.9120526. [16] P. Raviteja, K. T. Phan, Y. Hong and E. Viterbo, "Interference Cancellation and Iterative Detection for Orthogonal Time Frequency Space Modulation," in IEEE Transactions on Wireless Communications, vol. 17, no. 10, pp. 6501-6515, Oct. 2018, doi: 10.1109/TWC.2018.2860011. [17] 3GPP TS 36.101. "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) Radio Transmission and Reception," 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. [18] de Boor, Carl, A Practical Guide to Splines. Springer-Verlag, New York: 1978. | - |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/100606 | - |
| dc.description.abstract | 本論文探討適用於多重輸入多重輸出之正交時頻空間、正交時序多工與正交分頻多工系統的通道估測方法。針對高速移動環境下通道估測與等化的挑戰，提出一種基於插值的導頻通道估測方法，結合區塊式最小均方誤差等化，能有效降低運算複雜度並維持優異的偵測性能。
此外，本研究針對多重輸入多重輸出系統提出一種僅需單一導頻的通道估測架構，利用曲線擬合與符號交替技術，有效降低導頻與保護間隔所需的開銷。透過一階、二階及三階的曲線擬合法，分析其在不同移動速度下的估測準確性，並提出多種修正策略以改善高速移動時的估測誤差。 模擬結果顯示，所提出的方法在維持良好誤比特率與均方誤差表現的同時，亦能有效降低系統的導頻開銷，特別是在中低速移動環境下展現出顯著優勢。 | zh_TW |
| dc.description.abstract | This thesis investigates channel estimation techniques for Multiple-Input Multiple-Output (MIMO) systems based on Orthogonal Time Frequency Space (OTFS), Orthogonal Time Sequency Modulation (OTSM), and Orthogonal Frequency Division Multiplexing (OFDM). To address the challenges posed by rapidly time-varying channels in high-mobility scenarios, an interpolation-based pilot-assisted channel estimation method combined with blockwise Minimum Mean Square Error (MMSE) equalization is proposed, achieving reduced computational complexity while maintaining reliable detection performance.
Furthermore, a novel pilot-efficient channel estimation framework for MIMO OTFS/OTSM systems is developed, employing curve fitting and sign-alternating schemes to mitigate pilot contamination and reduce guard interval overhead. First-order, second-order, and third-order curve fitting methods are explored, and various refinement strategies are proposed to enhance estimation accuracy under high Doppler conditions. Simulation results confirm that the proposed methods achieve favorable Bit Error Rate (BER) and Normalized Mean Square Error (NMSE) performance while significantly reducing pilot overhead, particularly in low to moderate mobility scenarios. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2025-10-08T16:05:43Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2025-10-08T16:05:43Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 口試委員會審定書.............................. #
誌謝.............................. i 中文摘要.............................. ii 英文摘要.............................. iii 目次.............................. iv 圖次.............................. vi 表次.............................. viii 第一章 Introduction.............................. 1 1.1 Motivation.............................. 1 1.2 Contribution.............................. 2 1.3 Structure of Thesis.............................. 2 第二章 Background Knowledge.............................. 4 2.1 OFDM System.............................. 4 2.2 OTFS System.............................. 5 2.3 OTSM System.............................. 7 2.4 Channel Model.............................. 11 2.5 Blockwise MMSE Implementation.............................. 12 2.6 Implementation Pilot-Based Channel Estimation Method.............................. 13 2.7 Summary.............................. 16 第三章 Channel Estimation Methods for MIMO System.............................. 17 3.1 MIMO OTFS/OTSM System Structure.............................. 18 3.2 Multiple Pilots Channel Estimation Method.............................. 19 3.3 Proposed Channel Estimation Method.............................. 20 3.3.1 First-ordered Channel Estimation.............................. 20 3.3.2 Second-ordered Channel Estimation.............................. 21 3.3.3 Third-ordered Channel Estimation.............................. 23 3.3.4 Modifications and Improvements.............................. 24 3.4 Summary.............................. 25 第四章 Numerical Results.............................. 27 4.1 SISO System.............................. 28 4.1.1 OTFS and OTSM System.............................. 28 4.1.2 Blockwise MMSE Equalization.............................. 30 4.1.3 Interpolation Pilot-based Channel Estimation Method.............................. 32 4.2 MIMO System.............................. 33 4.2.1 Multiple Pilots Channel Estimation Method.............................. 33 4.2.2 Proposed Channel Estimation Method.............................. 35 4.3 Summary.............................. 42 第五章 Conclusion and Future Work.............................. 43 5.1 Conclusion.............................. 43 5.2 Future Work.............................. 43 參考文獻.............................. 45 | - |
| dc.language.iso | en | - |
| dc.subject | 多重輸入多重輸出,正交時頻空間,正交時序多工,通道估測,導頻設計,曲線擬合, | zh_TW |
| dc.subject | MIMO,OTFS,OTSM,Channel Estimation,Pilot Design,Curve Fitting, | en |
| dc.title | 一種適用於多重輸入輸出之正交時頻空間、正交時序多工及正交分頻多工系統的通道通用估測方法 | zh_TW |
| dc.title | A General Channel Estimation Method for MIMO OTFS, OTSM, and OFDM System | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.coadvisor | 李晃昌 | zh_TW |
| dc.contributor.coadvisor | Huang-Chang Lee | en |
| dc.contributor.oralexamcommittee | 趙啟超;蘇育德;呂忠津 | zh_TW |
| dc.contributor.oralexamcommittee | Chi-Chao Chao;Yu-Ted Su;Chung-Chin Lu | en |
| dc.relation.page | 47 | - |
| dc.identifier.doi | 10.6342/NTU202503398 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2025-08-14 | - |
| dc.contributor.author-college | 電機資訊學院 | - |
| dc.contributor.author-dept | 電信工程學研究所 | - |
| dc.date.embargo-lift | 2025-10-09 | - |
| 顯示於系所單位： | 電信工程學研究所 | |
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|---|---|---|---|
| ntu-113-2.pdf | 2.61 MB | Adobe PDF | 檢視/開啟 |
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