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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 許大山(Da-Shan Shiu) | |
| dc.contributor.author | Po-Hsien Wu | en |
| dc.contributor.author | 吳柏賢 | zh_TW |
| dc.date.accessioned | 2021-06-08T07:05:15Z | - |
| dc.date.copyright | 2008-11-25 | |
| dc.date.issued | 2008 | |
| dc.date.submitted | 2008-11-20 | |
| dc.identifier.citation | [1] L. Cimini Jr., 'Analysis and simulation of a digital mobile channel using
orthogonal frequency division multiplexing,' IEEE Trans. Commun.,vol. 33, pp.665-675, July 1985 [2] Sekchin Chang and Edward J. Powers, 'Cancellation of inter-carrier interference in OFDM systems using a nonlinear adaptive flter OFDM in time variant multipath channels with frequency offset,' Communications, 2000. ICC 2000. 2000 IEEE International Conference on Volume 2, 18-22 June 2000 pp. 1039 - 1043 vol.2 [3] Y.-H. Yeh and S.-G. Chen, 'Reduction of doppler-induced ICI by interference prediction,' in Proc. IEEE Int. Symp. Pers., Indoor Mobile Radio Commun., Sep. 2004, vol. 1, pp. 653V657. [4] M. Munster and L. Hanzo, 'Second-order channel parameter estimationassisted cancellation of channel variation-induced inter-subcarrier interference in OFDM systems,' in Proc. Int. Conf. EUROCON21, Trends Commun., Jul. 2001, vol. 1, pp. 1V5. [5] X.Huang and H.-C. Wu, 'Intercarrier interference analysis for wireless OFDM in mobile channels,' in Proc. IEEE Wireless Commmun. Netw.Conf., Apr. 2006, pp. 1848-1853 [6] Xiaozhou Huang and Hsiao-Chun Wu, 'Robust and e±cient intercarrier interference mitigation for OFDM systems in time-varying fading channels,' in IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 56, NO. 5, SEPTEMBER 2007 [7] Y. Zhao and S.-G. Haggman, 'Sensitivity to doppler shift and carrier frequency errors in OFDM systems - the consequences and solutions,' Proc. IEEE Vehicular Technology Conference, pp. 1564-1568, Atlanta, GA, Apr. 1996. [8] John G. Proakis, 'Digital communications', 4th Ed., McGraw-Hill, 2000. [9] D. Tse and P. Viswanath, 'Fundamentals of wireless communication', Cambridge University Press, 2005. [10] WC Jakes. Jr., et al., 'Microwave mobile communications,' New York: Wiley, 1974. [11] European Telecommunications Standards Institute, 'Radio Broadcasting Systems: Digital Audio Broadcasting (DAB) to Mobile, Portable, and Fixed Receivers,' May 1997, Sophia Antipolis, France. ETS300 401. [12] European Broadcasting Union, 'Digital video broadcasting framing structure, channel coding, and modulation for tigital terrestrial television,' Jan. 1999, Geneva, Switzerland. Draft EN300 744 V1.2.1.36 [13] M. Nakamura, T. Seki, M. Itami, K. Itoh, A. Hamid Aghvami, 'New estimation and equalization approach for OFDM under Doppler-spread channel.' in Pro. IEEE Int. Symp. Personal, Indoor Mobile Radio Communicatrions (PIMRC), pp.88-92, 2002. [14] T. Pollet, M. Van Bladel, M. Moeneclaey, 'BER sensitivity of OFDM systems to carrier frequency o®set and Wiener phase noise,' IEEE Trans. Conmmun., vol. 43, Issue 234, Feb-Mar-Apr 1995, pp. 191-193. [15] P. Robertson, S. Kaiser, 'Analysis of the loss of orthogonality through Doppler spread in OFDM systems,' in Proc. IEEE Global Telecommunications Conf., vol. 1b, 1999, pp. 701-706. [16] Hsiao-Chun Wu, 'Analysis and characterization of intercarrier and interblock interferences for wireless mobile OFDM systems,' IEEE Trans. Broadcasting, vol. 52, Issue 2, June 2006, pp. 203-210. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/26290 | - |
| dc.description.abstract | 在正交頻分多工系統(OFDM)中，系統的效能對於都卜勒效應或傳送端和接收端的頻率不同所造成的頻率誤差非常敏感。
在此篇論文中，我們提出了一個新的壓抑載波間干擾的技術，為Q-tap的分數間距最小平均平方誤差等化器(Q-tap FSMMSE Equalizer)。在跟傳統的最小平均平方誤差等化器(MMSE Equalizer)的比較下，我們提出方法之計算的複雜度可大幅度的降低而不會犠牲太多的效能。”分數間距”指的是等化器tap之間距為子載波間距的分數倍。此方法之效能對於傳送端與接收端之間中心頻率不同步不敏感。模擬也展示出，在陸地數位電視廣播(DVB-T)的接收端擁有高移動速度的情境下，對相同的Q之下，Q-tap二分之一倍的分數間距最小平均平方誤差等化器比Q-tap最小平均平方誤差等化器有更好的效能。 | zh_TW |
| dc.description.abstract | Orthogonal frequency division multiplexing (OFDM) digital communication system is very sensitive to frequency errors caused by doppler effect or frequency differences between transmitter and receiver local oscillators.
In this thesis, we propose a new intercarrier interference (ICI) suppression scheme, Q-tap fractionally spaced MMSE (FSMMSE) equalizer. 'Fractionally spaced' means the spacing of equalizer tap is a fraction of subcarrier spacing. The performance of this method is not sensitive to the unsynchronized center frequency. Simulation also show that Q-tap '1/2' FSMMSE equalizer has better performance than Q-taps MMSE equalizer with the same Q under the scenario of DVB-T receiver with very high mobile speed. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T07:05:15Z (GMT). No. of bitstreams: 1 ntu-97-R95942092-1.pdf: 1549566 bytes, checksum: 7e5e4d4dda87227cd05b5c1dc39ca1b6 (MD5) Previous issue date: 2008 | en |
| dc.description.tableofcontents | Contents 1
List of Figures 3 1 Introduction 1 1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Contribution and Organization . . . . . . . . . . . . . . . . . 2 2 Background 4 2.1 Equalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1.1 Fractionally Spaced Equalizer . . . . . . . . . . . . . . 4 2.2 Channel Model . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2.1 The Channel Model as A Linear Time-Varying System 8 2.2.2 Channel Autocorrelation Function and Power Spectra . 9 2.2.3 Statistical Channel Models . . . . . . . . . . . . . . . . 12 2.2.4 Propagation Scenario in This Thesis . . . . . . . . . . 13 3 The Performance Analysis on Fractionally spaced Equalizer over time variant channel in OFDM Systems 16 3.1 OFDM Signal Model . . . . . . . . . . . . . . . . . . . . . . . 17 3.1.1 Frequency Domain Representation of The OFDM Signal 20 3.2 Low Complexity ICI Cancelation . . . . . . . . . . . . . . . . 24 3.2.1 Q-tap Equalizer . . . . . . . . . . . . . . . . . . . . . . 24 3.2.2 OFDM Fractionally Spaced Q-tap Equalizer . . . . . . 26 3.2.3 The Performance Analysis under Same Equalizer Com- plexity . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 4 Simulation 31 4.1 An Example Study for DVB-T Receiver . . . . . . . . . . . . 31 5 Conclusions 34 Bibliography 35 | |
| dc.language.iso | en | |
| dc.title | 在正交頻分多工系統中頻域分數間距等化器的效能分析 | zh_TW |
| dc.title | Performance Analysis on Frequency Domain Fractionally Spaced Equalizer in OFDM systems | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 97-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 李學智(Hsueh-Jyh Li),馮世邁(See-May Phoong),朱士維(Shi-Wei Chu) | |
| dc.subject.keyword | 正交頻分多工,都卜勒,等化器,多倍取樣,分數間距, | zh_TW |
| dc.subject.keyword | OFDM,doppler,equalizer,oversample,fractionally spaced, | en |
| dc.relation.page | 37 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2008-11-20 | |
| 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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