(18.204.2.190) 您好!臺灣時間:2021/04/22 08:51
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:林敏裕
研究生(外文):Min-Yu Lin
論文名稱:正交分頻多工系統之通道響應重建與區塊干擾消除
論文名稱(外文):Channel Reponse Reconstruction and Inter-Block Interference (IBI) Cancellation for OFDM Systems
指導教授:沈文和
指導教授(外文):Wern-Ho Sheen
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電信工程系
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:中文
論文頁數:80
中文關鍵詞:正交分頻多工系統通道估算通道響應重建區塊干擾子載波干擾
外文關鍵詞:OFDMChannel EstimationChannel Response ReconstructionInter-Block Interference (IBI)Inter-Carrier Interference (ICI)
相關次數:
  • 被引用被引用:0
  • 點閱點閱:133
  • 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
正交分頻多工技術以良好的頻譜效益且具有抵抗多路徑衰減通道效應能力,成為現今高速無線傳輸技術主流。正交分頻多工系統中,當多路徑衰落通道延遲擴散超出保護區間時,則造成相鄰區塊干擾(Inter-Block Interference,IBI)效應。因此正交分頻多工系統若欲於通道延遲擴散較大的環境運作,則須使用區塊干擾消除方法以避免嚴重性能衰減。本論文主要探討OFDM系統之區塊干擾消除議題,除了探討時域循環性旋積信號還原及頻域等化器區塊干擾消除方法之性能外,本論文亦提出頻域適應性通道預測法,此方法可用於重建多路徑衰落通道響應,且具有適用於不同延遲擴散通道環境之彈性,毋須事先猜測通道環境特性。經由電腦模擬結果顯示,此方法所重建之通道響應具有較小之歸一化均方差(NMSE),在循環性旋積信號還原區塊干擾消除方法應用上亦有較佳之封包錯誤率(PER)。

Orthogonal Frequency Division Multiplexing (OFDM) is a promising technique for high data rate transmission. It has higher bandwidth efficiency and is more immune to the effect of multipath dispersion, as compared to the single carrier technique. However, as multipath dispersion exceeding the guard interval used in the system for multipath protection, inter-block interference (IBI) occurs and that results in significant degradation on system performance. In this thesis, the issue of IBI cancellation is investigated. Both time- and frequency-domain cancellation methods are studied and compared. A new frequency-domain channel prediction based on recursive least square (RLS) algorithm is proposed to accurately reconstruct the channel impulse response. Accurate channel reconstruction is a necessity for time-domain IBI cancellation to work properly. Computer simulations show that our new method of channel reconstruction can improve the cancellation performance very significantly.

目錄
頁次
中文摘要………………………………………………………………………... i
英文摘要………………………………………………………………………... ii
誌謝……………………………………………………………………………... iii
目錄....................................................................................................................... iv
圖目錄................................................................................................................... vi
表目錄................................................................................................................... viii
第一章 簡介....................................................................................................... 1
第二章 OFDM傳輸技術基本原理................................................................... 3
2.1 多載波調變原理......................................................................... 3
2.2 IFFT/FFT實現............................................................................ 8
2.3 循環前置碼................................................................................. 9
2.4 視窗法與接收端等化器............................................................. 12
第三章 IEEE 802.11a無線區域網路標準介紹................................................ 15
3.1 實體層碼框架構......................................................................... 15
3.2 PLCP前序信號........................................................................... 18
3.3 Signal Field................................................................................. 19
3.4 Data Field.................................................................................... 20
3.4.1 Service Field, Tail and Pad bits....................................... 20
3.4.2 攪亂器和迴旋編碼器..................................................... 21
3.4.3 資料位元交錯與子載波調變映射................................. 23
3.4.4 領航子載波與視窗法..................................................... 25
3.5 PMD規範.................................................................................... 26
第四章 通道模型與數位濾波器設計............................................................... 29
4.1 多路徑衰落通道模型. ............................................................... 29
4.2 數位濾波器設計......................................................................... 32
4.3 前置失真..................................................................................... 36
第五章 OFDM系統區塊干擾消除................................................................... 43
5.1 區塊干擾效應表述..................................................................... 43
5.2 區塊干擾消除方法..................................................................... 47
5.2.1 循環性旋積信號還原區塊干擾消除法......................... 47
5.2.2 頻域等化器..................................................................... 49
5.3 通道脈衝響應重建..................................................................... 49
5.3.1 通道內插法與最小平方法............................................. 51
5.3.2 頻域適應性通道預測法................................................. 53
5.4 模擬結果與分析......................................................................... 59
5.4.1 歸一化均方差................................................................. 59
5.4.2 封包錯誤率..................................................................... 66
第六章 結論與未來展望................................................................................... 76
參考文獻............................................................................................................... 77
個人簡歷………………………………………………………………………... 80

[1] J. G. Proakis, Digital Communications, 4th Ed. New York: McGraw-Hill, 2001.
[2] R. W. Chang, “Synthesis of band-limited orthogonal signals for multi-channel data transmission,” in Bell System Tech. J., vol.45, pp. 1775-1796, Dec. 1966.
[3] S. B. Weinstein and P. M. Ebert, “Data transmission by frequency-division multiplexing using the discrete fourier transform,” IEEE Trans. Commun., vol.19, pp. 628-634, Oct. 1971.
[4] A. Peled and A. Ruiz, “Frequency domain data transmission using reduced computational complexity algorithms,” in Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing, pp. 964-967, Denver, CO, 1980.
[5] ETS 300401: Radio Broadcast System: Digital Audio Broadcasting (DAB) to mobile, portable and fixed receivers. 2000..
[6] ETS 300744: Digital Video Broadcasting (DVB); Framing structure, channel coding, and modulation for digital terrestrial television. 2001.
[7] IEEE Std. 802.11a-1999, Part 11: Wireless LAN Medium Control (MAC) and Physical Layer (PHY) Specifications: High-speed Physical Layer in the 5GHz Band. LAN/MAN Standards Committee of the IEEE computer society, Sep. 16, 1999.
[8] IEEE Standard for Local and metropolitan area networks - Part 16: Air Interface for Fixed Broadband Wireless Access Systems - Amendment 2: Medium Access Control Modifications and Additional Physical Layer Specifications for 2-11 GHz, IEEE Std 802.16a-2003 (Amendment to IEEE Std 802.16-2001), pp. 0_1 -292, 2003.
[9] Richard Van Nee and Ranjee Prasad, OFDM for Wireless Multimedia Communications, Artech House, 2000.
[10] A.V. Oppenheim and R.W. Schafer, Discrete-Time Sginal Processing, 2nd ed. NJ: Prentice-Hall, 1999.
[11] T. Rappaport, Wireless Communications: Principles and Practice, Englewood Cliffs, NJ: Prentice-Hall, 1996.
[12] B. O’Hara and A. Petrick, The 802.11 handbook: A Designer’s Companion, Institute of Electrical and Electronics Engineers, Inc, Dec. 1999.
[13] IEEE Std 802.11g/D2.1, (Supplement to ANSI/IEEE Std 802.11, 1999 Edition) Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Further Higher-Speed Physical Layer Extension in the 2.4 GHz Band, January 2002
[14] Samel Celebi, “Interblock interference (IBI) and time of reference (TOR) computation in OFDM systems,” IEEE Trans. Commun., vol. 49, pp. 1895 -1900, November 2001.
[15] Dukhyun Kim, and Gordon L. Stuber, “Residual ISI cancellation for OFDM with applications to HDTV broadcasting,” IEEE J. Select. Areas Commun., vol. 16, pp. 1590-1599, October 1998.
[16] S. Trautmann, T. Karp, and N.J. Fliege, “Frequency domain equalization of DMT/OFDM systems with insufficient guard interval,” in IEEE International Conference on Communications, 2002, vol. 3, pp. 1646-1650, 28 April-2 May 2002
[17] S. Trautmann and N.J. Fliege, “Perfect equalization for DMT systems without guard interval,” IEEE J. Select. Areas Commun., vol.20, pp. 987-996, June 2002.
[18] Yumin Lee and Pinchieh Huang, “Channel interpolation and MMSE multi-input multi-output frequency-domain DFE for wireless data communications using OFDM,” in IEEE International Conference on Communications, vol.1, pp. 207 -211, 2002
[19] Heiko Schmidt, Volker Kuhn, Karl-Dirk Kammeyer, Reinhard Ruckriem, and Stefan Fechtel, “Channel Tracking in Wireless OFDM Systems,”
[20] Simon Haykin, Adaptive Filter Theory, 4th ed. Prentice Hall, 2002.
[21] Louis L. Scharf, Statistical Signal Processing : Detection, Estimation, and Time Series Analysis, Addison-Wesley, 1991.
[22] J. A. C., “Bingham. Multicarrier modulation for data transmission: An idea whose time has come,” IEEE Commun. Mag., vol.28, pp. 5-14, May 1990.
[23] P. S. Chow., J. M. Cioffi, and J. A. C. Bingham, “A practical discrete multi-tone transceiver loading algorithm for data transmission over spectrally shaped channels,” IEEE Trans. Commun., vol.43, pp. 773-775, Feb. 1995.
[24] H. Sari, G. Karam, and l. Jeanclaude, “Transmission techniques for digital terristrial TV broadcasting,” IEEE Commun. Mag., vol.33, pp. 100-109, Feb. 1995.
[25] A. Vahlin and N. Holte, “Optimal finite duration pulses for OFDM,” IEEE Trans. Commun., vol.44, pp. 10-14, Jan. 1996.
[26] Henrique S. Malvar and David H. Staelin, “Optimal FIR pre- and postfilters for decimation and interpolation of random signals,” IEEE Trans. Commun., vol. 36, pp. 67 — 74, January 1988.
[27] John Terry and Juha Heiskala, OFDM Wireless LANs: A Theoretical and Practical Guide, SAMS, 2002.
[28] Heinrich Meyr, Marc Moeneclaey, and Stefan A. Fechtel, Digital Communication Receivers, John Wiley & Sons, 1998.
[29] Pinchieh Huang and Yumin Lee, “Adaptive decision feedback orthogonality restoration filter for windowed OFDM,” in IEEE VTS 54th VTC 2001 Fall, vol. 2 , pp. 1106 -1110 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