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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 鐘嘉德 | zh_TW |
| dc.contributor.advisor | Char-Dir Chung | en |
| dc.contributor.author | 黃予璿 | zh_TW |
| dc.contributor.author | Yu-Hsuan Huang | en |
| dc.date.accessioned | 2025-07-23T16:36:34Z | - |
| dc.date.available | 2025-07-24 | - |
| dc.date.copyright | 2025-07-23 | - |
| dc.date.issued | 2025 | - |
| dc.date.submitted | 2025-07-20 | - |
| dc.identifier.citation | [1] R. Hadani et al., “Orthogonal time frequency space modulation,” in Proc. IEEE Wireless Commun. Netw. Conf., San Francisco, CA, USA, Mar. 2017, pp. 1-6.
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Hong, “Diversity analysis of OTFS over block time-varying channels,” IEEE Trans. Veh. Technol., vol.73, no.9, pp. 14062-14067, Sep. 2024. [23] K. Sinha, S. K. Mohammed, P. Raviteja, Y. Hong, and E. Viterbo, “OTFS based random access preamble transmission for high mobility scenarios,” IEEE Trans. Veh. Technol., vol. 69, no. 12, pp. 15078-15094, Dec. 2020. [24] X. Geng et al., “Random access preamble design and timing advance estimation for OTFS systems in high-mobility scenarios,” Electronics, vol. 13, no. 7, art. no. 1166, Apr. 2024. [25] M. S. Khan, Y. J. Kim, Q. Sultan, J. Joung, and Y. S. Cho, “Downlink synchronization for OTFS-based cellular systems in high Doppler environments,” IEEE Access, vol. 9, pp. 73575-73589, May 2021. [26] M. Bayat and A. Farhang, “Time and frequency synchronization for OTFS,” IEEE Wireless Commun. Lett., vol. 11, no. 12, pp. 2670-2674, Dec. 2022. [27] C. D. Chung, M. Z. Xu, and W. C. Chen, “Initial time synchronization for OTFS,” IEEE Trans. Veh. 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Boca Raton, FL, USA: CRC Press, 2013. [38] A. V. Oppenheim and R. W. Schafer, Discrete-Time Signal Processing, 3rd ed. Upper Saddle River, NJ: Prentice Hall, 2010. | - |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/98053 | - |
| dc.description.abstract | 本報告進行對初始時間同步(initial time synchronization; ITS)的研究，ITS對於在線性時變多路徑(linear time varying multipath; LTV)通道下運行的正交時頻間距調變(orthogonal time frequency space; OTFS)的相干解調至關重要。先前的研究已經開發了有效地基於前導訊框的ITS方法，並利用各種選擇最大值識別規則來估計LTV通道中具有強主導路徑的情況下的主導路徑延遲。然而，當LTV通道沒有強主導路徑時，這些ITS方法的估計準確性會明顯降低。本報告提出了一種基於梳狀前導訊框(comb-type preamble-frame; CPF)的ITS系統，該系統採用離散時間過取樣技術，並引入了兩種新的選擇主導峰值識別規則，以提升ITS的性能。無論LTV通道是否具有強主導路徑，改進的CPF型ITS系統在估計準確性和對都卜勒的穩健性方面均顯著優於現有的基於前導訊框的ITS系統。 | zh_TW |
| dc.description.abstract | Initial time synchronization (ITS) is essential for the coherent demodulation in orthogonal time frequency space systems operating over the linear time varying multipath (LTV) channels. Previous studies have developed efficacious preamble-frame-based ITS approaches using various select-the-largest identification rules to estimate the leading channel path delay over LTV channels exhibiting a strong leading path. However, such ITS approaches provide noticeable estimation inaccuracy under LTV channels without a strong leading path. In this paper, a comb-type preamble-frame (CPF)-based ITS system adopting discrete-time oversampling and two new select-the-leading-peak identification rules are proposed to provide improved ITS performance. Particularly, whether LTV channels exhibit a strong leading path or not, the improved CPF-based ITS system outperforms existing preamble-frame-based ITS systems significantly in estimation accuracy and robustness against Doppler spread. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2025-07-23T16:36:34Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2025-07-23T16:36:34Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 誌謝 i
中文摘要 ii Abstract iii Contents iv List of Figures vi List of Tables viii List of Abbreviations ix Notations iii Chapter 1 Introduction 1 1.1 Rectangularly-pulsed OTFS Modulation 1 1.2 Initial Time Synchronization 2 1.3 Multipath Propagation 6 1.4 Motivation and Contribution 7 1.5 Organization 8 Chapter 2 ITS System 9 2.1 Transmitted Signal 9 2.1.1 Comb-type Preamble Frame Waveform 9 2.1.2 Discrete Ambiguity Function 10 2.1.3 Transmitted Signal Model 11 2.2 Received Signal 12 2.2.1 LTV Channel Model 12 2.2.2 Received Signal Model 12 2.2.3 Discrete Cross-Ambiguity Measures 15 Chapter 3 Synchronization Rules 21 3.1 Review of Select-the-largest Identification Rule 22 3.2 Review of Newtonized-select-the-largest Identification Rule 23 3.3 Review of Select-the-largest Group Identification Rule 23 3.4 Select-the-leading-peak Identification 1 Rule 24 3.5 Select-the-leading-peak Identification 2 Rule 29 Chapter 4 Performance Results 32 4.1 Channel and System Parameters 34 4.2 Performance Results of SLPI1-CPF System 36 4.3 Performance Results of SLPI2-CPF System 44 4.4 Comparison of Complexity 47 Chapter 5 Conclusion 50 Reference 51 Appendix 56 | - |
| dc.language.iso | en | - |
| dc.subject | 正交時頻間距 | zh_TW |
| dc.subject | 初始時間同步 | zh_TW |
| dc.subject | 線性時變多路徑通道 | zh_TW |
| dc.subject | 梳狀前導訊框波形 | zh_TW |
| dc.subject | linear time-varying multipath channel | en |
| dc.subject | orthogonal time frequency space | en |
| dc.subject | comb-type preamble frame waveform | en |
| dc.subject | initial time synchronization | en |
| dc.title | 矩形脈波正交時頻間距調變系統之改進的初始時間同步 | zh_TW |
| dc.title | Improved Initial Time Synchronization for Rectangularly-pulsed Orthogoanl Time Frequency Space Systems | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.coadvisor | 陳維昌 | zh_TW |
| dc.contributor.coadvisor | Wei-Chang Chen | en |
| dc.contributor.oralexamcommittee | 林茂昭;蘇育德;古孟霖 | zh_TW |
| dc.contributor.oralexamcommittee | Mao-Chao Lin;Yu-Ted Su;Meng-Lin Ku | en |
| dc.subject.keyword | 正交時頻間距,梳狀前導訊框波形,初始時間同步,線性時變多路徑通道, | zh_TW |
| dc.subject.keyword | orthogonal time frequency space,comb-type preamble frame waveform,initial time synchronization,linear time-varying multipath channel, | en |
| dc.relation.page | 56 | - |
| dc.identifier.doi | 10.6342/NTU202502071 | - |
| dc.rights.note | 同意授權(限校園內公開) | - |
| dc.date.accepted | 2025-07-21 | - |
| 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 | 2025-07-24 | - |
| 顯示於系所單位： | 電信工程學研究所 | |
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