高速移動環境下多天線正交分頻多工之通道估測與等化

以作者查詢圖書館館藏

、以作者查詢臺灣博碩士

、以作者查詢全國書目

、勘誤回報

、線上人數：22

、訪客IP：18.117.145.41

姓名

徐華璘(Hua-Lin Hsu) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

高速移動環境下多天線正交分頻多工之通道估測與等化
(Channel Estimation and Equalization for multiple antennas OFDM System in High-mobility Environment)

相關論文

★ WiMAX基地台信號覆蓋實地量測與分析	★ 被動元件阻抗量測原理及實務
★ 正交分頻多工接收機中數位降頻器之低通濾波器設計	★ 適用於數位電視之里德所羅門編解碼硬體實作
★ 數位電視地面廣播系統之通道估測與等化器設計與實現	★ 數位電視地面廣播之數位基頻收發機即時軟體設計與實現
★ 數位電視地面廣播系統通道解碼之腓特比解碼器實現	★ 無線區域網路收發機之整合實現與測試
★ 以DSP處理器實現數位電視地面廣播系統發射機	★ 數位電視內接收機同步系統之設計與實現
★ AIS實體層(GMSK/FM)與資料鏈結層軟體無線電技術實現	★ 數位電視地面廣播系統內接收機之快速傅立葉轉換處理器研究與設計
★ 數位電視地面廣播之數位降頻器與再取樣器設計與實現	★ 軟體無線電任意基頻訊號接收機系統設計及實現
★ 陣列天線互耦及接收機增益與相位對波束合成器性能影響及校正研究	★ 適用於OFDM系統之可變長度快速傅立葉轉換處理器設計與實現

檔案

[Endnote RIS 格式]

[Bibtex 格式]

[相關文章]

[文章引用]

[完整記錄]

[館藏目錄]

[檢視]

[下載]

本電子論文使用權限為同意立即開放。
已達開放權限電子全文僅授權使用者為學術研究之目的，進行個人非營利性質之檢索、閱讀、列印。
請遵守中華民國著作權法之相關規定，切勿任意重製、散佈、改作、轉貼、播送，以免觸法。

摘要(中)

DVB-T是採用正交分頻多工（OFDM）的技術來傳送，OFDM系統具有抵抗多重路徑干擾及頻譜使用效率高等優異特性，其中抵抗多重路徑干擾是藉由前置循環字首（Cyclic prefix）及多載波之特性以達到免除碼字間干擾（ISI），而頻譜使用效率高則是運用多載波正交特性達到的。在高速移動環境下，DVB-T訊號經過時變的通道，接收到的訊號會有都普勒擴展(Doppler Spread)的現象，破壞了子載波間的正交性，而引起載波間干擾(ICI)，使得最高容許的接收速度下降。為了克服高速移動所引起的載波間干擾(ICI)，本論文將前人方法加以改良，介紹了一套適合高速移動接收的通道估測與等化的方法。
　　在此論文中，我們參考DVB-T系統，且進一步的修改使其更合適於高速移動下的環境。我們運用多天線分集多工與ICI估測與消除，並比較了三種不同的通道與ICI估測方法(FD-LS、PN-code、Group Pilot)。
　　在DVB-T在8K模式、16QAM、編碼率為1/2的條件下，利用此改良的方法可以使單天線DVB-T系統達到250km/h，多天線系可達到300km/h。最後，若引入Group pilot估測技術則單天線系統更可達到300km/h。

摘要(英)

DVB-T is an OFDM system, which exhibits outstanding characteristics in terms of simplicity in combating multi-path transmission and efficiency in spectral utilization. The ISI effect results from the multi-path interference could be successfully eliminated by the insertion of cyclic-prefix and the use of multi-carriers. In high-mobility environment, DVB-T signals pass the time-varying channel, and a loss of sub-carrier orthogonality due to Doppler spread of received signals leads to inter-carrier interference (ICI).This ICI effect degrades the maximum allowed velocity of reception. For eliminating this ICI effect due to high-mobility reception, this thesis modifies other’s methods and introduces a method about channel estimation and equalization, which is suitable high-mobility reception.
In this thesis, we refer to the DVB-T standard, and further make it suitability for high mobility environment.We use multiple antennas technique and ICI cancellation,compares three different scheme for channel and ICI estimation.
This thesis proposed method improve the maximum allowed velocity as high as 250km/h for DVB-T receiver with SISO in 8K mode、16QAM、code-rate=1/2,and multiple antennas DVB-T reception improve the maximum allowed velocity more then 300km/h.Finally, reception use group pilot estimation technique SISO-DVB-T-like can work as 300km/h.

關鍵字(中)

★ 載波間干擾
★ 歐規數位電視地面廣播
★ 高速移動

關鍵字(英)

★ DVB-T
★ ICI
★ High-mobility

論文目次

摘要 i
誌謝 iii
目錄 iv
圖目錄 vii
表目錄 xi
第一章緒論 1
1.1 研究動機與背景 1
1.2 章節提要 2
第二章正交分頻多工系統與多天線分集技術簡介 3
2.1 正交分頻多工系統簡介 3
2.1.1 OFDM調變介紹 3
2.1.2 OFDM領航碼輔助通道估測 (Pilot Assisted Channel Estimation)與系統種類介紹 8
2.1.3 OFDM基頻等效模型 13
2.2 多天線分集技術簡介 15
2.2.1 接收端分集 (Receiver diversity) 15
2.2.2 傳送端分集 (Transmit diversity) 17
2.3 多天線分集技術與正交分頻多工系統之結合 19
2.3.1 MRC-OFDM 和 STBC-OFDM 19
2.3.2 SFBC-OFDM 22
第三章歐規數位電視地面廣播系統簡介 24
3.1 DVB-T系統規格與參數 24
第四章通道估測與載波間干擾消除 30
4.1 正交分頻多工系統與載波間干擾 30
4.2 動態通道模型 (Time-varying Channel Model) 33
4.3 通道估測(Channel Estimation) 37
4.3.1 SISO/SIMO-OFDM 系統通道估測 37
4.3.1.1 通道估測與載波間干擾估測合適於DVB-T 37
4.3.1.1.1 最小平方法通道估測 (Least Square Channel Estimation) 38
4.3.1.1.2 通道響應插值 (Interpolation of the Channel Response) 39
4.3.1.1.3 載波間干擾估測 (ICI Estimation) 40
4.3.1.1.4 通道估測準確度之改善1 (反覆式通道估測) 48
4.3.1.1.5 通道估測準確度之改善2 (通道濾波) 49
4.3.1.2 結合通道與載波間干擾估測法 (Joint Channel and ICI Estimation Method) 51
4.3.1.3 虛擬雜訊序列通道與ICI估測法 (Pseudo-noise Channel and ICI Estimation Method) 55
4.3.2 MISO/MIMO-OFDM 系統通道估測 60
4.3.2.1 散佈領航碼頻域最小平方法通道估測 (Scattered Pilot Frequency Domain-Least Square Channel Estimation, FD-LS) 60
4.3.2.2 SFBC 散佈領航碼頻域最小平方法通道估測 (SFBC Scattered Pilot Frequency Domain-Least Square Channel Estimation, FD-LS) 61
4.3.2.3 結合通道與載波間干擾估測法 (Joint Channel and ICI Estimation Method) 62
4.3.2.4 虛擬雜訊序列通道與ICI估測法 (Pseudo-noise Channel and ICI Estimation Method) 63
4.4 通道等化與載波間干擾消除(Channel Equalization and ICI Cancellation) 64
4.4.1 連續式載波間干擾消除 (Serial Intercarrier Interference Cancellation) 65
4.4.2 考慮ICI之零值逼近等化 (Zero-forcing Equalization with Considering ICI) 66
4.4.3 結合零值逼近等化與連續干擾消除 69
4.4.4 低複雜度零值逼近等化 (Low-Complexity Zero-forcing Equalization) 70
第五章電腦模擬與結果分析 72
5.1 模擬接收機架構介紹 72
5.2 高速移動下DVB-T系統效能模擬 74
5.3 不同通道與載波間干擾估測方法之比較 75
5.4 不同載波間干擾等化與消除方法之比較 79
5.5 多天線分集技術與載波間干擾等化消除技術模擬 81
5.6 綜合比較模擬 83
第六章結論與未來發展 90
參考文獻 91

參考文獻

[1] ETSI EN 300 744, Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television, European Standard.
[2] “Framing Structure, Channel Coding and Modulation for Digital Television Terrestrial Broadcasting System”, 2006-04
[3] Sinem Coleri, Mustafa Ergen, Anuj Puri, Ahmad Bahai, “Channel Estimation Techniques Based on Pilot Arrangement in OFDM Systems,” IEEE Transaction on Broadcasting, vol. 44, No.3, Sep. 2002
[4] A. Dowler and A. Nix, “Performance evaluation of channel estimation techniques in a multiple antenna OFDM system,” Proceedings of Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th, vol. 2, pp. 1214-1218, 2003.
[5] B. Muquet, Z. Wang, G.B. Giannakis, M. de Courville, P. Duhamel, “Cyclic prefixing or zero padding for wireless multicarrier transmissions?”, IEEE Transactions on Communications, Volume 50, Page(s):2136 – 2148, Dec. 2002
[6] M. Muck, M. de Courville, , M. Debbah, P. Duhamel, “A pseudo random postfix OFDM modulator and inherent channel estimation techniques” Global Telecommunications Conferenceb, Volume 4, Page(s):2380 – 2384, Dec. 2003
[7] P.W. Wolniansky; G.J. Foschini, G.D. Golden, R.A. Valenzuela, “V-BLAST: an architecture for realizing very high data rates over the rich-scattering wireless channel”, in 1998, pp. 295-300
[8] S. M. Alamouti, “A simple transmit diversity technique for wireless communications,” IEEE Journal on Selected Areas of Communication, vol. 16, pp. 1451-1458, Oct. 1998.
[9] V. Tarokh, H. Jafarkhani, and A. R. Calderbank, “Space–time block codes from orthogonal designs,”IEEE Trans. Inform. Theory, vol. 45, pp. 1456–1467, July 1999.
[10] K. F. Lee, D. B. Williams, “A Space-Time Coded Transmitter Diversity Technique for Frequency Selective Fading Channels”, Sensor Array and Multichannel Signal Processing Workshop, IEEE Proceedings, pp. 149-152, 2000.
[11] Lee, K.F.; Williams, D.B, “A space-frequency transmitter diversity technique for OFDM systems” Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE Volume 3, 27 Nov.-1 Dec. 2000 Page(s):1473 - 1477 vol.3
[12] V. Tarokh, S. M. Alamouti, and P. Poon, "New detection schemes for transmit diversity with no channel estimation," Proceedings of IEEE International Conference on Universal Personal Communications, vol. 2, pp. 917-920, 1998.
[13] Yi Wang; Zhiheng Guo; Xiaofeng Tao; Ping Zhang, “Pilot Design and Channel Estimation in MIMO-OFDM System with Two Transmit Antennas”, Communications and Networking in China, Page(s):1 – 5, Oct. 2006
[14] B. Ozbek,, D. Le Ruyet, “Low complexity ZF receiver for orthogonal SFBC-OFDM in broadband wireless channels”, Volume 42, Page(s):479 – 481, April 2006
[15] A. Agrawal, G. Ginis, J.M. Cioffi, “Channel diagonalization through orthogonal space-time coding”, IEEE International Conference on Communications, Volume 3, Page(s):1621 – 1624, May 2002,
[16] A. Hutter and R. “Hasholzner, “Determination of Intercarrier Interference Covariance Matrices and their Application to Advanced Equalization for Mobile OFDM,” in 5th International OFDM-Workshop 2000, pp. 33/1-33/5, Technische Universitat Hamburg-Harburg, Sept. 2000
[17] A.A. Hutter, J.S. Hammerschmidt, E. e Carvalho, J.M. Cioffi, “Receive diversity for mobile OFDM systems”, Wireless Communications and Networking Conference, Volume 2, Page(s):707 – 712, Sept. 2000
[18] MOTIVATE report to the 36th DVB-T Meeting (2000-01) Using DVB-T standard to deliver broadcast Services to mobile receiver
[19] W. C. Jakes. “Microwave Mobile Communications” [M]. IEEE Press, Wiley Interscience, 1994.
[20] Y. Mostofi and D. Cox, “ICI mitigation for pilot-aided OFDM systems,” IEEE Transactions on Wireless Communications, vol. 4,no. 2, pp. 765-774, March 2005.
[21] Volker Fischer, Alexander Kurpiers and Dominik Karsunke,” ICI Reduction Method for OFDM Systems”, 8th International OFDM-Workshop 2003 (InOWo'03), Hamburg, Conference Proceedings.
[22] 施寶鎮,”高速移動環境下DVB-T數位電視廣播之通道估測與等化”, 中央大學碩士論文。
[23] Xiaoguang Wu, uixia Kang, ian Tang, ing Zhang, ingyu Zhou “An Pilot-Assisted Channel Estimation Method for OFDM Systems in Time-Varying Channels”, Personal, Indoor and Mobile Radio Communications, Page(s):1 – 6, Sept. 2007
[24] A. G. Armada, and M. Calvo, “phase noise and sub-carrier spacing effects on the performance of an OFDM communication system,” IEEE Commun. Lett., Vol. 2, No. 1, pp. 11-13, Jan. 1998.
[25] A. Stamoulis, S. N. Diggavi, and N. Al-Dhahir, “Intercarrier Interference in MIMO OFDM,” IEEE transactions on signal processing, vol. 50, no. 10 pp. 2451– 2464., Oct. 2002,
[26] GUO Qiao, GUI Lin, ZHANG Wen-jun, “Research on Channel Estimation and Equalization in TDS-OFDM System” VIDEO ENGINEERING, NO.10 2005 (Sum No280)
[27] Bowei Song, Lin Gui, Yunfeng Guan, Wenjun Zhang, “On channel estimation and equalization in TDS-OFDM based terrestrial HDTV broadcasting system”, IEEE Transactions on Consumer Electronics, Volume 51, Issue 3, Page(s):790 – 797, Aug. 2005
[28] Guanghui Liu, Junling Zhang, “ITD-DFE Based Channel Estimation and Equalization in TDS-OFDM Receivers”, IEEE Transactions on Consumer Electronics, Volume 53, Page(s):304 – 309, May 2007
[29] Won Gi Jeon, Kyung Hi Chang,Yong Soo Cho, ”An Equalization Technique for OFDM Systems in Time-Variant Multipath Channels”,IEEE Transactions on Communications,Vol.47, NO.1, Jan. ,1999
[30] Martin Toeltsch, Andreas F. Molisch, “Equalization of OFDM-Systems by Interference Cancellation Techniques”, IEEE International Conference On Communications, Vol.6,2001.p.p. 1950-1954.2001
[31] P. Schniter, ”Low-complexity equalization of OFDM in doubly selective channels”, IEEE Transaction on Signal Process.,Vol.52, NO.4, Apr. ,2004

指導教授

陳逸民(Yih-Min Chen)

審核日期

2008-7-14

推文