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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46609完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張進福 | |
| dc.contributor.author | Chan-Shuo Chang | en |
| dc.contributor.author | 張展碩 | zh_TW |
| dc.date.accessioned | 2021-06-15T05:18:33Z | - |
| dc.date.available | 2015-07-23 | |
| dc.date.copyright | 2010-07-23 | |
| dc.date.issued | 2010 | |
| dc.date.submitted | 2010-07-20 | |
| dc.identifier.citation | [1] W. C. Jakes, Microwave Mobile Communication, 2nd ed. Piscataway, NJ; IEEE Press, 1994.
[2] T. S. Rappaport, Wireless Communications; Principles and Practice Upper Saddle River, NJ; Prentice-Hall, 1996 [3] Won Gi Jeon; Kyung Hi Chang; Yong Soo Cho; , 'An equalization technique for orthogonal frequency-division multiplexing systems in time-variant multipath channels,' Communications, IEEE Transactions on , vol.47, no.1, pp.27-32, Jan 1999 [4] Kwanghoon Kim; Hyuncheol Park; , 'A Low Complexity ICI Cancellation Method for High Mobility OFDM Systems,' Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd , vol.5, no., pp.2528-2532, 7-10 May 2006 [5] Chi Kuo; Jin-Fu Chang; , 'Equalization and channel estimation for OFDM systems in time-varying multipath channels,' Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on , vol.1, no., pp. 474- 478 Vol.1, 5-8 Sept. 2004 [6] Yang-Seok Choi; Voltz, P.J.; Cassara, F.A.; , 'On channel estimation and detection for multicarrier signals in fast and selective Rayleigh fading channels,' Communications, IEEE Transactions on , vol.49, no.8, pp.1375-1387, Aug 2001 [7] Schniter, P.; , 'Low-complexity equalization of OFDM in doubly selective channels,' Signal Processing, IEEE Transactions on , vol.52, no.4, pp. 1002- 1011, April 2004 [8] Soon Up Hwang; Jeong Hoon Lee; Jongsoo Seo; , 'Low Complexity Iterative ICI Cancellation and Equalization for OFDM Systems Over Doubly Selective Channels,' Broadcasting, IEEE Transactions on , vol.55, no.1, pp.132-139, March 2009 [9] M. Hsieh and C. Wei, “Channel estimation for OFDM systems based on comb-type pilot arrangement in frequency selective fading channels” in IEEE Trans. Consumer Electron., vol.44, no. 1, Feb. 1998. [10] Yang-Seok Choi; Voltz, P.J.; Cassara, F.A.; , 'On channel estimation and detection for multicarrier signals in fast and selective Rayleigh fading channels,' Communications, IEEE Transactions on , vol.49, no.8, pp.1375-1387, Aug 2001 [11] G. I. Ohta, F. Kamada, N. Teramura and H. Hojo, “ 5 GHz W-LAN verification for public mobile applications – Internet newspaper on train and advanced ambulance car ”, CCNC 2004 IEEE 1st, pp. 569–574, 2004 [12] Won Gi Jeon, Kyung Hi Chang, and Yong Soo Cho,” An Equalization Technique for Orthogonal Frequency-Division Multiplexing Systems in Time-Variant Multipath Channels ”, IEEE Transactions on Communications, Vol.47, NO.1, Jan. 1999 [13] Joonsuk Kim“ Interference Suppression for High Data Rate STBC/SFBC with 1-bit Feedback “, IEEE Communication Letters, vol.13 No. 1, January 2009 [14] Wei Bai; Lin Tang; Zhiyong Bu; , 'An equalization method for OFDM in time varying multipath channels,' Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th , vol.3, no., pp. 1740- 1743 Vol. 3, 26-29 Sept. 2004 [15] Zijian Tang; Cannizzaro, R.C.; Leus, G.; Banelli, P.; , 'Pilot-Assisted Time-Varying Channel Estimation for OFDM Systems,' Signal Processing, IEEE Transactions on , vol.55, no.5, pp.2226-2238, May 2007 [16] Rugini, L.; Banelli, P.; Cacopardi, S.; , 'A full-rank regularization technique for MMSE detection in multiuser CDMA systems,' Communications Letters, IEEE , vol.9, no.1, pp. 34- 36, Jan. 2005 [17] Y. Zahao and A. Huang, “ A novel Channel estimation method for OFDM Mobile Communications Systems based on pilot signals and transform domain processing” in Proc. IEEE 47th Vehicular Techno.Conf., Phoenix, USA, pp. 2089-2093, May 1997. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46609 | - |
| dc.description.abstract | 正交分頻載波多工系統使用在時變及頻率選擇性通道，會造成相當大的子載波間干擾效應現象。在這種高速的移動環境下行動通訊會遭受極大的都卜勒效應，系統受到的快速衰減影響相當大，傳統的非時變通道傳道解調架構由於無法克服這個問題，而使得錯誤率大幅提升。
此篇論文我們利用ICI效應產生之機制，提出一個等化器之演算法。此等化器作用方式分為二個階段，在第一階段我們使用時域加窗的方式來抑制ICI效應，並且在第二階段採用疊代估測法的方式來估測頻域符號。模擬結果顯示我們提出的等化器在頻率選擇性通道中其效能及其複雜度比起傳統的線性MMSE估測法均有獲得改善。 | zh_TW |
| dc.description.abstract | Orthogonal frequency division multiplexing (OFDM) systems may experience significant inter-carrier interference (ICI) when used in time- and frequency-selective, or doubly selective, channels. In high mobility environment mobile communication suffers from critical Doppler effect, the performance is decreasing due to fast fading. The structure of the traditional demodulation system in time-invariant channel can not conquer this problem, so that the BER is rapidly rising.
In this thesis we take the advantage of the mechanism generated by ICI effect, and we proposed calculating method of the equalizer. This method contains two stages, the first stage applies time-domain windowing to restrict ICI support, and the second stage uses iterative estimation to estimate finite-alphabet frequency-domain symbols. Simulation results indicate that our equalizer has significant performance and complexity advantages over the classical linear MMSE estimator in doubly selective channels. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T05:18:33Z (GMT). No. of bitstreams: 1 ntu-99-R97942088-1.pdf: 2043808 bytes, checksum: 777cc66f91856d67c15e1c0bb2619fa4 (MD5) Previous issue date: 2010 | en |
| dc.description.tableofcontents | 致 謝 ii
中文摘要 iii ABSTRACT iv 目 錄 I 圖目錄 III 表目錄 VII Chapter 1 緒論 1 1.1 前言 1 1.2 OFDM架構及簡介 3 1.3 無線通道環境介紹 6 1.3.1 前言 6 1.3.2 通道環境之參數 7 1.3.3 通道模型 13 1.4 研究動機 17 1.5 論文架構 17 Chapter 2 時變通道下子載波間干擾及其抑制方法 19 2.1 前言 19 2.2 高速移重環境中的都卜勒效應 (Doppler Effect)造成之ICI現象 19 2.3 ICI成因 21 2.4 ICI Cancellation文獻回顧及消除機制 21 Chapter 3 加窗技術設計 29 3.1 前言 29 3.2 時域加窗介紹 29 3.3 最大訊號與干擾及雜訊之比加窗設計 (Max SINR Window) 33 3.4 最小帶狀近似誤差加窗設計 (Min BAE Window) 36 3.5 模擬結果 37 Chapter 4 低複雜度之等化器技術疊代估測法 45 4.1 介紹 45 4.2 SIS (Successive Interference Suppression) 47 4.3 MMSE-SD (Successive detection) 48 4.4 MMSE-ASD (advanced Successive Detection) 51 4.5 模擬結果及複雜度比較 56 Chapter 5 總結 65 5.1 各章結論 65 5.2 未來可能延伸方向 67 參考文獻 69 | |
| dc.language.iso | zh-TW | |
| dc.subject | 複雜度 | zh_TW |
| dc.subject | 都卜勒效應 | zh_TW |
| dc.subject | 子載波間干擾效應 | zh_TW |
| dc.subject | 等化器 | zh_TW |
| dc.subject | 正交分頻載波多工系統 | zh_TW |
| dc.subject | 加窗 | zh_TW |
| dc.subject | 疊代偵測 | zh_TW |
| dc.subject | iterative estimation | en |
| dc.subject | complexity | en |
| dc.subject | Doppler effect | en |
| dc.subject | ICI | en |
| dc.subject | equalization | en |
| dc.subject | OFDM | en |
| dc.subject | windowing | en |
| dc.title | 在時變多路境環境下OFDM用於克服ICI效應之低複雜度加窗技術 | zh_TW |
| dc.title | Low Complex Windowing Method of ICI Reduction for OFDM Systems in Time-Varying Multipath Channels | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 98-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 魏學文,金力鵬,黃政吉 | |
| dc.subject.keyword | 都卜勒效應,子載波間干擾效應,等化器,正交分頻載波多工系統,加窗,疊代偵測,複雜度, | zh_TW |
| dc.subject.keyword | Doppler effect,ICI,equalization,OFDM,windowing,iterative estimation,complexity, | en |
| dc.relation.page | 71 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2010-07-21 | |
| 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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