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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張進福 | |
| dc.contributor.author | Jing-Min Yang | en |
| dc.contributor.author | 楊竣閔 | zh_TW |
| dc.date.accessioned | 2021-06-13T16:39:04Z | - |
| dc.date.available | 2005-07-26 | |
| dc.date.copyright | 2005-07-26 | |
| dc.date.issued | 2005 | |
| dc.date.submitted | 2005-07-05 | |
| dc.identifier.citation | [1] Kai Shi and Serpedin, E.; ” Coarse frame and carrier synchronization of OFDM systems: a new metric and comparison ” ,Wireless Communications, IEEE Transactions on, Volume 3, Issue 4, July 2004 Page(s):1271 - 1284
[2] A. J. Coulson ; “Maximum likelihood synchronization for OFDM using a pilot symbol: Analysis” ,IEEE J. Select. Areas Commun., vol. 19, pp. 2495–2503, Dec. 2001. [3] Hlaing Minn; Bhargava, V.K. Letaief, K.B.; “A robust timing and frequency synchronization for OFDM systems” ,Wireless Communications, IEEE Transactions on Volume 2, Issue 4, July 2003 Page(s):822 – 839 [4] T. M. Schmidl and D. C. Cox, “Robust frequency and timing synchronization for OFDM,” IEEE Trans. Commun., vol. 45, pp. 1613–1621, Dec. 1997. [5] Zhang, J.L.; Wang, M.Z.; Zhu, W.L.; “A novel OFDM frame synchronization scheme” Communications, Circuits and Systems and West Sino Expositions, IEEE 2002 International Conference on Volume 1, 29 June-1 July 2002 Page(s):119 - 123 vol.1 [6] H. Minn, M. Zeng, and V. K. Bhargava, “On timing offset estimation for OFDM systems,” IEEE Commun. Lett., vol. 4, pp. 242–244, July 2000. [7] Byungjoon Park; Hyunsoo Cheon; Changeon Kang; Daesik Hong; “A novel timing estimation method for OFDM systems” ,Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE Volume 1, 17-21 Nov. 2002 Page(s):269 - 272 vol.1 [8] Theodore s. Rappaport ; “Wireless Communications : Principles and Practice” ,2nd Edition , Prentice Hall , 2002 [9] Irvine, J.; Couvy, J.-P.; Graziosi, F.; Laurila, J.; Mossakowski, G.; Robin, P.; “System architecture for the MOSTRAIN project (mobile services for high speed trains)” ,Vehicular Technology Conference, 1997 IEEE 47th Volume 3, 4-7 May 1997 Page(s):1917 - 1921 vol.3 [10] http://www.thsrc.com.tw/main/hsr/faq/01.asp?item=2 [11] J. J. van de Beek, M. Sandell, and P. O. Borjesson, “ML estimation of time and frequency offset in OFDM systems,” IEEE Trans. Signal Processing, vol. 45, pp. 1800–1805, July 1997. [12] N. Lashkarian and S. Kiaei, “Class of cyclic-based estimators for frequency offset estimation of OFDM systems,” IEEE Trans. Commun., vol. 48, pp. 2139–2149, Dec. 2000. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/38609 | - |
| dc.description.abstract | 近年來正交分頻多工技術(OFDM)相當熱門，廣泛運用在無線區域網路802.11a與數位電視廣播系統DVB，也被看好應用於第四代無線行動系統，另外台灣高速鐵路也在今年正式開通，希望未來能讓乘客在高速移動的火車享受同等的通訊服務，而由於OFDM系統利用子載波正交性來達到低頻寬高傳輸率的系統特性，因此有良好的同步技術來維持子載波間正交性極為重要的。
本論文在因應高速移動環境下，提出一個新的同步符元，並以此為基礎，在時間與粗調中心載波頻率漂移的同步問題上作探討，另外也提出一個簡易的方法，讓傳統方法的同步符元在高速移動環境下輕易改善在時間同步上的表現。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2021-06-13T16:39:04Z (GMT). No. of bitstreams: 1 ntu-94-R91942099-1.pdf: 4819539 bytes, checksum: 08f84c584ddfe3f16516a0c0b9a5bdfa (MD5) Previous issue date: 2005 | en |
| dc.description.tableofcontents | 第一章 緒論............................................................................................................1
1.1 研究背景.......................................................................................................1 1.2 OFDM系統介紹與同步的影響....................................................................1 1.3 文獻回顧.......................................................................................................4 1.4 高速移動環境與通道模型...........................................................................6 1.4.1 台灣高速鐵路現況..........................................................................6 1.4.2 高速鐵路系統架構..........................................................................7 1.4.3 通道模型..........................................................................................9 1.5 研究動機及論文架構.................................................................................12 第二章 高速移動環境下OFDM系統四段式同步符元的探討..........................15 2.1 四段式同步符元及其度量式.....................................................................15 2.1.1 [B B –B B] 同步符元及其度量式..............................................15 2.1.2 所提出的同步符元及其度量式....................................................16 2.2 粗調封包偵測.............................................................................................24 2.2.1 [B B –B B] 封包與頻率同步的步驟..........................................24 2.2.2 所提 [C D –C D] 粗調封包偵測的問題與改善........................25 2.2.3 考慮高速移動環境中[C D –C D]粗調封包偵測進一步改善....27 2.3 [C D –C D]細調封包偵測及頻率偏移的估測.........................................32 2.3.1 細調封包偵測................................................................................32 2.3.2 頻率偏移估測................................................................................35 2.4 結論.............................................................................................................37 第三章 高速移動環境下運用八段式同步符元的封包與頻率同步的探討......39 3.1 研究動機.....................................................................................................39 3.2 八段式同步符元及其時間度量式.............................................................40 3.2.1 八段式以C、D為子符元的同步符元及時間度量式....................41 3.2.2 八段式以B為子符元的同步符元及時間度量式.........................49 3.3 八段式符元的粗調封包偵測.....................................................................50 3.4 細調封包偵測與頻率偏移的估測.............................................................53 3.5 結論.............................................................................................................59 第四章 針對高速移動環境通道下時變性同步符元時間估測的影響與改善..61 4.1 研究動機.....................................................................................................61 4.2 對[B B -B B]的調整方法............................................................................61 4.2.1 接收信號數學模型........................................................................61 4.2.2 所提的翻轉方法............................................................................62 4.2.3 翻轉位置的探討............................................................................65 4.3 翻轉方法應用在[B B]上的探討.................................................................67 4.3.1 [B B]的度量式與其問題...............................................................67 4.3.2 所提的方法在時間估測上的改善................................................69 4.4 翻轉方法應用在八段式同步符元上的探討.............................................71 4.5 結論.............................................................................................................78 第五章 總結..........................................................................................................79 參考文獻......................................................................................................................81 | |
| dc.language.iso | zh-TW | |
| dc.title | 在高速鐵路環境下OFDM系統的粗略框碼與中心載波同步訓練符元之研究 | zh_TW |
| dc.title | A Study on Training Symbols in Coarse Frame and Carrier Synchronization for OFDM Systems in High-Speed Train Environment | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 93-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 鐘嘉德,魏學文 | |
| dc.subject.keyword | 正交分頻多工,同步,訓練符元, | zh_TW |
| dc.subject.keyword | OFDM,synchronization,training symbol, | en |
| dc.relation.page | 82 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2005-07-05 | |
| 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 |
| 顯示於系所單位： | 電信工程學研究所 | |
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