(3.227.235.183) 您好!臺灣時間:2021/04/20 09:26
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:陳俊吉
研究生(外文):Chun-Chi Chen
論文名稱:應用於正交分頻多工無線區域網路系統之連續式時間同步法
論文名稱(外文):A Successive Timing Synchronization Method for OFDM-Based Wireless Local Area Network
指導教授:李鎮宜
指導教授(外文):Chen-Yi Lee
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電子工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2003
畢業學年度:91
語文別:英文
論文頁數:64
中文關鍵詞:正交分頻多工同步無線區域網路
外文關鍵詞:OFDMsynchronizationWLAN
相關次數:
  • 被引用被引用:0
  • 點閱點閱:65
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
正交分頻多工系統,如IEEE 802.11a,廣泛應用於無線區域網路。而正交分頻多工系統中的時間同步是相當重要的議題,嚴重的時間誤差將造成後續解碼失敗。所以對封包傳輸式的正交分頻多工系統很需要一個快速且精準的時間同步器,同步器還要能處理一些干擾因素,如雜訊、多重路徑效應和頻偏效應,同時能達到理想的效能。
論文中將提出一個應用於正交分頻多工無線區域網路之連續式時間同步法,其中包含封包偵測,頻偏估測及傳送符元時間同步,最後會提出完整的連續式時間同步架構。除了連續式時間同步法之外,同時還會比較目前一些基本的時間同步器。模擬結果顯示,連續式時間同步法誤差較小且能快速收斂,尤其更能適應於嚴重的衰減通道下的環境。

The OFDM system such as IEEE 802.11a is utilized widely in the Wireless LAN. The timing synchronization is an important topic for the OFDM system since the serious timing error will destroy the proceeding demodulation. A rapid and accurate timing synchronizer is needed for the packet-based OFDM system. Also it needs to deal properly with some interference factor such as noise, multipath effect, and frequency offset etc; concurrently, achieve a desirable performance.
In this thesis, a successive timing synchronization fit for OFDM-based Wireless LAN is proposed. The proposed timing synchronization includes packet detection, frequency offset estimation, and symbol timing synchronization and an accomplished architecture of the successive timing synchronization is proposed as well. Besides, some fundamental timing synchronizers are discussed. The proposed successive timing synchronization is comparatively more powerful than some fundamental timing synchronizations as a consequence of the speedy convergence and low timing error. Especially, it is robust enough in the serious fading channel as confirmed by the simulation results.

Abstract
Contents
1. Introduction
2. OFDM System
2.1 The Basis of OFDM
2.2 The Imperfections of OFDM
2.3 The Conclusions of OFDM basis
3. Wireless LAN Physical Layer Specifications of IEEE 802.11a
3.1 The Major Parameter of IEEE 802.11a
3.2 The Frame Structure of IEEE 802.11a
3.3 The Channel Model of IEEE 802.11a
3.4 OFDM System Simulation Platform
4. Timing Synchronization for IEEE 802.11a
4.1 The Overview of Timing Synchronization
4.2 An Efficient Timing Synchronization
4.3 A Rapid Timing Synchronization
4.4 A Hybrid-correlation Timing Synchronization
5. Successive Timing Synchronization
5.1 Algorithm of the Successive Timing Synchronization
5.2 Performance analysis of Timing Synchronization
5.3 Architecture of the Successive Timing Synchronization
6. Conclusions and Future Works

[1] R. W. Chang, “Synthesis of band-limited orthogonal signals for multichannel data transmission”, Bell System Tech. J., 45:1775-1796, Dec. 1966
[2] IEEE 802.11, IEEE Standard for Wireless LAN Medium Access Control and Physical Layer Specifications, Nov. 1999.
[3] Speth, M., Gunnar Fock, D., Meyr, H., “Optimum Receiver Design for Wireless Broad-Band Systems Using OFDM-Part I”, IEEE Transactions on Communications, vol. 47, No. 11,November 1999.
[4] Pollet, T.; Van Bladel, M.; Moeneclaey, M, “BER Sensitivity of OFDM Systems to Time Synchronization Error”, Communications, IEEE Transactions on , Volume: 43 Issue: 2 , Feb/Mar/Apr 1995
Page(s): 191 -193
[5] Speth, M., Daecke, D., Meyr, H., “Minimum overhead burst synchronization for OFDM based broadband transmission”, IEEE Global Telecommunications Conference, vol. 5, pp. 2777-2882, 1998.
[6] P. H. Moose, “A Technique for OFDM frequency offset correction”, IEEE TRANS. COMMUN, vol.42, Oct. 1994, pp2908-2914.
[7] John Terry, Juha Heiskala, “OFDM wireless LANs: A Theoretical and Practical Guide”, pp. 48-73, 2002.
[8] R. Van Nee, “OFDM codes for peak-to average power reduction and error correction”, IEEE Global Telecommun. Conf., vol. 1, pp. 740-744, 1996.
[9] Kun-Wah Yip, Tung-Sang Ng, Yik-Chung Wu, “Impacts of Multipath Fading on the Timing Synchronization of IEEE 802.11a Wireless LANs”, IEEE International Conference, Vol 1, pp. 517-521, 2002.
[10] Van Nee, R., “A New OFDM Standard for High Rate Wireless LAAN in the 5 GHz Band”, IEEE vehic. Tech. Conf., Fall 1999.
[11] Bob O’Hara, Al Petrick, “The IEEE 802.11 Handbook”, New York. IEEE press, 1999.
[12] Chin-Fang Hsu, Yuan-Hao Huang, Tzi-Dar Chiueh. “Design of an OFDM receiver for high-speed wireless LAN”. IEEE International Symposium, Circuits and Systems, pp. 558-561, April, 2001
[13] Timothy M. Schmidl and Donald C. Cox, Fellow, IEEE. ”Robust Frequency and Timing Synchronization for OFDM”. IEEE TRANSACTIONS ON COMMUNICATIONS, vol. 45, no. 12, December 1997.
[14] P.R. Chevillat, D. Maiwald, and G. Ungerboecck. ”Rapid training of a voiceband data modem receiver employing an equalizer with fractional T-spaced coefficients”. IEEE Trans on Communications, 35:869-876, September 1987.
[15] Speth, M. Classen, F., Meyr, H., ”Frame synchronization of OFDM systems in frequency selective fading channels”. Vehicular Technology Conference, 1997 IEEE 47th, Volume 3, page: 1807-1811, 4-7 May 1997.
[16] J.-J. Van de Beek, M. Sandell and P. O. Brjesson, ”ML estimation of time and frequency offset in OFDM systems”. IEEE Trans. Signal Processing, Vol. 45, no. 7, pp. 1800-1805, 1800-1805, Jul 1997.
[17] 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, page: 119-123, 2002.
[18] Speth, M., Fechtel, S., Meyr, H., ”Optimum receiver design for OFDM-based broadband transmission .II. A case study”. IEEE Trans. Commun., vol. 49, pp. 2908-2914, Oct 1994.
[19] Chia-Sheng. Peng, Chian-Hung Cho and Kuei-Ann Wen, ”Frame Synchronization and Digital AGC for OFDM Based WLAN”. European wireless Modulation and Signal Synchronization, vol. 42, pp. 2908-2914, Feb 2002.
[20] Schwoerer, L., ”VLSI suitable synchronization algorithms and architecture for IEEE 802.11a physical layer”. IEEE International Symposium on, Circuits and Systems vol. 5, v-721 —v-724, 2002.
[21] R. E. Ziemer, W. H. Tranter, ”Principles of Communications systems, Modulation, and Noise”, John Wiley &Sons, version 5-th, 2002.
[22] Theodore S. Rappaport, ”Wireless Communications Principles and Practice”, Prentice Hall PTR, version 2-th, 2002.
[23] Richard van Nee, Ramjee Prasad, ”OFDM for Wireless Multimedia Communications”, Artech House Boston.London, 1999.
[24] Ferdinand Classen, Heinrich Meyr, ”Frequency Synchronization Algorithms for OFDM Systems suitable for Communication over Frequency Selective Fading Channels”, Vehicular Technologyy Conference, 1994 IEEE 44-th, vol 3, pp 1655-1659, Jun 1994.
[25] Stefan Johansson, Martin Nilsson, Peter Nilsson, ”An OFDM Timing Synchronization ASIC”, Electronics, Circuits, Systems ICECS, vol. 1, pp. 324-327, 2002.
[26] Kabulepa, L.D., Garcia Ortiz A., Glesner M., ”Power reduction techniques for an OFDM burst synchronization core”, Electronics, Circuits, Systems ISCAS, vol. 1, pp. 256-268, 2002.
[27] Donghoon Lee and kyungwhoon Cheun, ”Coarse Symbol Synchronization Algorithms for OFDM Systems in Multipath Channels”, IEEE Communications Letters, vol. 6, No. 10, 2002.
[28] Charles J. You, J. Henry Horng, ”Optimum frame and frequency synchronization for OFDM systems”, ICCE Consumer Electronics, pp. 226-227, 2001.

QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
系統版面圖檔 系統版面圖檔