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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 許大山(Da-Shan Shiu) | |
dc.contributor.author | Sheng-Yu Huang | en |
dc.contributor.author | 黃笙瑜 | zh_TW |
dc.date.accessioned | 2021-06-13T03:42:47Z | - |
dc.date.available | 2011-07-29 | |
dc.date.copyright | 2006-07-29 | |
dc.date.issued | 2006 | |
dc.date.submitted | 2006-07-26 | |
dc.identifier.citation | [1] John G. Proakis, 'Digital Communications', 4th Ed., McGraw-Hill, 2000.
[2] WC Jakes. Jr., et al., 'Microwave mobile communications,' New York: Wiley, 1974. [3] D. Tse and P. Viswanath, 'Fundamentals of Wireless Communication', Cambridge University Press, 2005. [4] Theodore S. Rappaport, 'Wireless Communications: Principles and Practice,' 2th Ed., New Jersey: Prentice-Hall, 2002. [5] ETSI EN 300 744 (V1.4.1), 'Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television,' Jan 2001. [6] J.E. Mazo, 'Exact matched filter bound for two-beam Rayleigh fading,' IEEE Trans. Commun., vol. 39, Issue 7, July 1991, pp. 1027-1030. [7] Fuyun Ling, 'Matched filter-bound for time-discrete multipath Rayleigh fading channels,' IEEE Trans. Commun., vol. 43, Issue 234, Feb-Mar-Apr 1995, pp. 710-713. [8] G.E. Bottomley, E. Sourour, R. Ramesh, S. Chennakeshu, 'Optimizing the performance of limited complexity RAKE receivers' in Proc. IEEE Vehicular Technology Conf., vol. 2, 18-21 May 1998, pp. 968-972. [9] R.D.J. Van Nee, 'The Multipath Estimating Delay Lock Loop,' Spread Spectrum Techniques and Applications, 29 Nov.-2 Dec. 1992, pp. 39-42. [10] R.D.J. Van Nee, J. Siereveld, P.C. Fenton, B.R. Townsend, 'The multipath estimating delay lock loop: Approaching theoretical accuracy limits,' in Proc. IEEE Position Location and Navigation Symp., vol. 1, April 1994, pp. 246-251. [11] E. Sourour, G. Bottomley, R. Ramesh, 'Delay tracking for direct sequence spread spectrum systems in multipath fading channels,' in Proc. IEEE Vehicular Technology Conf., vol. 1, 16-20 May 1999, pp. 422-426. [12] M. Rlinami, H. Morikawa, T. Aoyama, 'An adaptive multipath mitigation technique for GPS signal reception,' in Proc. IEEE Vehicular Technology Conf., vol. 2, 15-18 May 2000, pp. 1625-1629. [13] Boon Chong Ng, M. Cedervall, A. Paulraj, 'A structured channel estimator for maximum likelihood sequence detection in multipath fading channels,' IEEE Trans. Vehicular Technology, vol.48, Issue 4, July 1999, pp. 1216-1228. [14] M.D. Hahm, Z.I. Mitrovski, E.L. Titlebaum, 'Deconvolution in the presence of Doppler with application to specular multipath parameter estimation,' IEEE Trans. Signal Processing, vol. 45, Issue 9, Sept. 1997, pp. 2203-2219. [15] T.G. Manickam, R.J. Vaccaro, 'A non-iterative deconvolution method for estimating multipath channel responses,' in Proc. IEEE Int. Conf. Acoustics, Speech, and Signal Processing (ICASSP), vol. 1, 27-30 April 1993, pp. 333-336. [16] K.C. Zangi, L.G. Krasny, 'Using side information to improved channel estimation for channels with fractionally-spaced medium rays,' in Proc. IEEE Vehicular Technology Conf., vol. 3, 15-18 May 2000, pp. 1904-1908. [17] M. Barton, D.W. Tufts, 'Reduced-rank least squares channel estimation,' IEEE Trans Acoustics, Speech, and Signal Processing, vol. 38, Issue 8, Aug. 1990, pp. 1403-1410. [18] Z. Kostic, M.I. Sezan, E.L. Titlebaum, 'Estimation of the parameters of a multipath channel using set-theoretic deconvolution,' IEEE Trans. Commun., vol. 40, Issue 6, June 1992, pp. 1006-1011. [19] Z. Kostic, G. Pavlovic, 'Resolving subchip-spaced multipath components in CDMA communication systems,' IEEE Trans. Vehicular Technology, vol. 48, Issue 6, Nov. 1999, pp. 1803-1808. [20] D.D. Colclough, E.L. Titlebaum, 'Delay-Doppler POCS for specular multipath ,' in Proc. IEEE Int. Conf. Acoustics, Speech, and Signal Processing (ICASSP), vol. 4, 13-17 May 2002, pp. 3940-3943. [21] 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. [22] M. Nakamura, M. Fujii, M. Itami, K. Itoh, A.H. Aghvami, 'A study on an MMSE ICI canceller for OFDM under Doppler-spread channel,' in Pro. IEEE Int. Symp. Personal, Indoor Mobile Radio Communicatrions (PIMRC), vol. 1, 7-10 Sept. 2003, pp. 236-240. [23] T. Pollet, M. Van Bladel, M. Moeneclaey, 'BER sensitivity of OFDM systems to carrier frequency offset and Wiener phase noise,' IEEE Trans. Conmmun., vol. 43, Issue 234, Feb-Mar-Apr 1995, pp. 191-193. [24] 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. [25] 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. [26] Yang-Seok Choi; P.J. Voltz, F.A. Cassara, 'On channel estimation and detection for multicarrier signals in fast and selective Rayleigh fading channels,' IEEE Trans. Commun., vol. 49, Issue 8, Aug. 2001, pp. 1375-1387. [27] J.-J. van de Beek, O. Edfors, M. Sandell,S.K. Wilson, P.O. Borjesson, 'On channel estimation in OFDM systems,' in Proc. IEEE Vehicular Technology Conf., vol. 2, 25-28 July 1995, pp. 815-819. [28] O. Edfors, M. Sandell, J.-J. van de Beek, S.K. Wilson, P.O. Borjesson, 'OFDM channel estimation by singular value decomposition,' IEEE Trans. Commun., vol. 46, Issue 7, July 1998, pp. 931-939. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/32323 | - |
dc.description.abstract | 在同調偵測的系統中,接收端必須利用通道狀態資訊來恢復所傳送之訊息信號。有關通道參數估計的問題,例如:相對時間延遲(relative delay),衰減值(attenuation)以及相位(phase)估測之研究已經在諸多文獻中被討論。在實際的通道狀態裡,重疊多路徑通道(即路徑間隔為一個符元區間之內)可能在很多通訊環境裡發生。在這篇論文內,我們對於如何在緊密間隔多路徑(closely-spaced multipath)通道的環境中解析重疊路徑成分(overlapped multipath components)的問題感到興趣,因為這是通道估測過程中最具挑戰的情況之一。
許多基於最小平方準則(Least-square criterion)或近似最小平方法之通道參數估測技術已經在文獻中被提出。在此研究的第一部分,我們將描述如何利用已知收發機濾波器之資訊,來實現最小平方通道估測演算法。並且解釋欲估測之複合通道事實上是位於由收發機濾波器之脈衝響應所構成的子空間(subspace)中。因此,我們將研究在接收端不知道正確路徑延遲的前提下,所假設的子空間(hypothesis subspace)對最小平方通道估測法的衝擊。此外,我們推導出在基於最小平方準則下,通道參數之估計均方誤差(MSE)的上下界理論值。此上下界理論值可用來說明路徑延遲間隔假定(delay hypothesis spacing)和過取樣比(oversampling ratio)是如何影響通道估測器的性能。 論文的第二部分將討論正交頻分多工(OFDM)傳輸中,由都卜勒擴散通道(Doppler spread channel)所產生的載波間干擾(ICI)效應。在移動通道中,都卜勒擴展會破壞子載波之間的正交性,將而導致載波間干擾。其結果可能嚴重地降低系統性能的表現。由於都卜勒偏移(Doppler shift)可以視為在頻域上的“時間延遲”,因此前述的最小平方估測法可以直接延伸應用於估計正交頻分多工系統中所遭受的都卜勒偏移。最後,基於最小平方準則之通道估測演算法,我們會提供有關參數設計上的導引和建議,如路徑延遲間隔假定、過取樣比和相關器之相關視窗大小(the width of the correlation window)等參數之取決。 | zh_TW |
dc.description.abstract | In the coherent detection systems, the knowledge of the channel states is necessary to recover the transmitted information signal. The problem of estimating channel parameters such as relative delay, attenuation and phase has been addressed in the literature. In the realistic channel condition the overlapped multipath components (at most one symbol apart) may happen in many communication environments. In this thesis, we are interested in the problem of solving overlapped multipath components in the closely-spaced multipath scenario because this is one of the most challenging situation in the channel estimation process.
Many channel estimation techniques have been proposed based on least-square criterion or to give the approximate least-square estimates. In the first part of this research, we describe a least-square algorithm to incorporate a prior knowledge of the transmit and receive filters into the channel estimation procedure. It is shown that the composite channel lies on the subspace formed by the impulse responses of the transceiver filters. We will investigate the impact of not modelling the time delays exactly when constructing this hypothesis subspace. Moreover, a lower and an upper bound of mean-square-error (MSE) for least-square based algorithms are derived, which show how the performance depends on the delay hypothesis spacing and oversampling ratio. The second part of the thesis discusses the problem of inter-carrier interference (ICI) due to Doppler spread channel in orthogonal frequency division multiplexing (OFDM) transmission. The Doppler spread in mobile radio channel distort the orthogonality among subcarriers resulting in ICI, which seriously degrades the performance of systems. It is observed that the Doppler shifts looks like the 'delay' in the frequency domain. The least-square technique can be directly extended to estimate Doppler shifts for OFDM systems. We will give a guidance in selecting some implementation parameters such as path hypothesis spacing, oversampling factor and the width of the correlation window for the least-square based channel estimation algorithms. | en |
dc.description.provenance | Made available in DSpace on 2021-06-13T03:42:47Z (GMT). No. of bitstreams: 1 ntu-95-R93942035-1.pdf: 997432 bytes, checksum: 25b2be622194d1acb85a017774f38eb0 (MD5) Previous issue date: 2006 | en |
dc.description.tableofcontents | Abstract i
Contents ii List of Figures iv 1 Introduction 1 1.1 Motivation of The Thesis . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Contributions of The Thesis . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Thesis Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Channel Model 6 2.1 The Channel Model as A Linear Time-Varying System . . . . . . . . . . 6 2.2 Channel Autocorrelation Function and Power Spectra . . . . . . . . . . . 7 2.3 Statistical Channel Models . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.4 Propagation Scenario in This Thesis . . . . . . . . . . . . . . . . . . . . 11 3 Multipath Parameter Estimation Techniques 13 3.1 Signal and System Model . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.2 Delay, Amplitude and Phase Estimation Techniques for Discrete Multipath Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.2.1 Envelope Tracking with Subtraction . . . . . . . . . . . . . . . . . 17 3.2.2 Projection Onto Convex Set (POCS) . . . . . . . . . . . . . . . . 19 3.3 Performance Bound Analysis for Least-Square Based Algorithms . . . . . 21 3.3.1 Delay, Amplitude and Phase Estimation Based on Least Square Criterion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.3.2 Mean-Square-Error Performance Bound Analysis for Least-Square Based Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.3.3 The E®ect of Delay Hypothesis Spacing . . . . . . . . . . . . . . . 30 3.3.4 The E®ect of The Width of Correlation Window . . . . . . . . . . 33 3.3.5 A Comparison between Least-square and POCS . . . . . . . . . . 34 4 Delay, Amplitude, Phase and Doppler Shift Estimation for OFDM Systems under A Time and Frequency Dispersive Channel 37 4.1 OFDM Signal Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 4.1.1 Frequency Domain Representation of The OFDM Signal . . . . . 42 4.2 Delay, Amplitude, Phase and Doppler Shift Estimation Based on Least-Square Criterion for OFDM Systems . . . . . . . . . . . . . . . . . . . . 45 4.2.1 Channel Parameters Estimation Based on Least-Square Criterion 45 4.2.2 The E®ect of Doppler Shift Hypothesis Spacing . . . . . . . . . . 48 4.2.3 The E®ect of The Width of Correlation Window . . . . . . . . . . 50 4.3 An Example Study for DVB-T Receiver . . . . . . . . . . . . . . . . . . 51 5 Conclusion 56 Bibliography 58 | |
dc.language.iso | en | |
dc.title | 基於最小平方通道估測演算法之效能極限和其延伸應用於正交頻分多工系統中之都卜勒位移估測 | zh_TW |
dc.title | Performance Limit for Least-Square Based Channel Estimation and Its Extension for Doppler Shift Estimation in OFDM Systems | en |
dc.type | Thesis | |
dc.date.schoolyear | 94-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 蘇炫榮(Hsuan-Jung Su),李學智(Hsueh-Jyh Li),馮世邁(See-May Phoong) | |
dc.subject.keyword | 最小平方法,密集間隔多路徑通道,正交頻分多工,都卜勒位移, | zh_TW |
dc.subject.keyword | Least-square,Closely-spaced multipath channel,OFDM,Doppler shift, | en |
dc.relation.page | 61 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2006-07-26 | |
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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