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研究生:謝忠憲
研究生(外文):Chon-Hsien Hsieh
論文名稱:在快速雷利衰減通道中對時變速度用戶的強健性多載子分碼多重存取通道估測
論文名稱(外文):Robust MC-CDMA Channel Estimation for the User with Time-Varying Velocity Over Rapidly Rayleigh Fading Channel
指導教授:陳博現
指導教授(外文):Bor-Sen Chen
學位類別:碩士
校院名稱:國立清華大學
系所名稱:電機工程學系
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:2004
畢業學年度:92
語文別:中文
論文頁數:41
中文關鍵詞:適應性非集中式濾波器多載子分碼多重存取雷利衰減聯合估測
外文關鍵詞:Adpative unscented filterMC-CDMARayleighjoint estimation
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  • 被引用被引用:0
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  • 下載下載:17
  • 收藏至我的研究室書目清單書目收藏:0
多載子分碼多重存取(MC-CDMA)結合了多載子傳輸與直序列展頻兩種調變方式,近來已經有一些方法在討論當通道資訊未知的狀況下如何設計MC-CDMA系統。在本論文中,我們考慮更實際的情況,那就是使用者的速度會隨著時間改變。所以,我們將提出一個可以對時變性的通道衰減有穩健性的適應性非集中式濾波器(Adaptive Unscented Filter)。首先,我們假設通道為自回歸(AutoRegressive)隨機程序,接下來用提出的適應性非集中式濾波器經由非線性的方式同時估測這個自回歸程序的參數以及通道增益以達到在時變衰減通道中的穩健性。在通道估測後,我們可以利用估測到的通道以及在估測過程中產生的一些參數來增強等化器的性能。而在這裡我們採用決策回授的方式來作通道估測。用電腦模擬的結果顯示,我們所提出的利用適應性非集中式濾波器所做的決策回授方式可以更穩健並且更準確的追蹤到通道。
Multicarrier code-division multiple access (MC-CDMA) combines multicarrier transmission with direct sequence spread spectrum. Recently, different approaches have been adopted without assuming a perfectly known channel. In this paper, we consider the more realistic case that the velocity of mobile station is time-varying. Thus, we present a channel estimation algorithm called Adaptive Unscented Filter (AUF) that can be robust to the variational fading rate. First, we model the mobile radio channel as an AutoRegressive (AR) random process. Then we jointly estimate the parameters of the AR process and the channel gain using the proposed AUF to achieve the robust estimation under variational fading rate. Following channel estimation, the parameters produced in the computation of AUF are used to enhance the performance of the MMSE equalizer. In tracking mode, we adopt decision-directed scheme based on AUF to track both the dynamics and gains of channel and then to detect the signal using the enhanced MMSE equalizer. Simulation results indicate that the proposed AUF-based decision-directed channel tracking algorithm can track the channel more precisely and robustly than the conventional channel estimator. And the enhanced MMSE method can achieve more robust equalization of MC-CDMA communication systems over the rapid multipath Rayleigh fading channel.
摘要………………………………………… i

致謝………………………………………… ii

目錄………………………………………… iii

第一章:簡介……………………………… iv

第二章:MC-CDMA系統介紹……………… v

第三章:強健性通道追蹤演算…………… vi

第四章:增強型MMSE等化器設計………… vii

第五章:電腦模擬結果與討論…………… viii

第六章:結論……………………………… ix

英文版論文………………………………… x
[1] A. J. Viterbi, CDMA, Principle of Spread Spectrum Communications. Reading, MA:
Addison-Wesley, 1995.
[2] K. Tachikawa, “W-CDMA Mobile Communications Systems,” John Wiley & Sons
Inc., 2002.
[3] E. Dahlman, B. Gudmundson„ M. Nilsson, and J. Skold, “UMTS/IMT-2000 Based
onWidband CDMA,” IEEE Communication Magzine, vol. 36, no. 9, pp. 70-80, Sept.
1998.
[4] “802.11 WLAN Standard,” IEEE 802.11 Standards Committee, 1994.
[5] H. Honkasalo, K. Pehkonen, M.T.Niemi, A.T.Leino, “WCDMA and WLAN for 3G
and beyond,” IEEE Wireless Communications, vol. 9, no. 2, pp.14-18, April 2002.
[6] A. Chouly, A. Brajal, and S. Jourdan, “Orthogonal multicarrier technique applied
to direct sequence spread spectrum CDMA systems,” Proc. IEEE GLOBECOM’93,
Houston, pp.1723-1728, Nov. 1993.
[7] V. N. Richard and P. Ramjee, “OFDM Wireless Multimedia Communications,”
Artech House, 2000.
[8] J. A. C. Bingham, “Multicarrier modulation for data transmission: An idea whose
time has come,” IEEE Communication magzine, vol. 28, pp. 5-14, May 1990.
[9] N. Yee, J. P. Linnartz, “Wiener filtering of multi-carrier CDMA in Rayleigh fading
channel,” PIMRC’94, vol.4, pp.1344 - 1347, Sept. 1994.
[10] H. Xing and M. Renfors, “The performance evaluation of the multicarrier CDMA
system with frequency domain equalization,” IEEE Vehicular Technology Conf., vol.
4, pp. 2362 -2366, 1999.
[11] A. Peled and A. Ruiz, “Frequency domain data transmission using reduced computational
complexity algorithms,” Proc. IEEE Int. Conf. Acoust., Speech, Signal
Processing, pp. 964-968, 1980.
[12] L. Lindbom, “Simplified Kalman estimation of fading mobile radio channels: high
performance at LMS computational load ”Acoustics, Speech, and Signal Processing,
ICASSP93, Vol.3 , pp.352 - 355, April 1993.
[13] P. H-Y Wu and A. Duel-Hallen, “Multiuser detectors with disjoint Kalman channel
estimators for synchronous CDMA mobile radio channels,” IEEE Trans. Commun.,
vol. 48, no. 5, pp. 752 -756, May 2000.
[14] H. Y. Wu and A. Duel-Hallen, “On the performance of coherent and noncoherent
multiuser detectors for mobile radio CDMA channels,” PROC. IEEE 6th Int. Conf.
Universal Personal Communications (ICUPC’96), Cambridge, MA, pp. 76-80, Oct.
1996.
[15] S. J. Julier and J. K. Uhlmann, “Unscented filtering and nonlinear estimation,”
Proceedings of the IEEE , vol.92 , no.3, pp.401-422, March 2004.
[16] S. J. Julier, J. K. Uhlmann, and H. F. Durrant-Whyte, “A new approach for filtering
nonlinear systems,” in Proc. American Control Conf.,pp. 1628—32, 1995.
[17] S. Haykin, Adaptive Filter Theory, 4rd Edition. Prentice-Hall, 2002.
[18] T. Muller, H. Rohling, and R. Grunheid, “Comparison of different detection algorithms
for OFDM-CDMA in broadband Rayleigh fading,”in Proc. IEEE Vehicular
Technology Conf., pp. 835—838, 1995.
[19] S. Kaiser, “Analytical performance evaluation of OFDM-CDMA mobile radio
systems,” in Proc. 1st European Personal and Mobile Communications Conf.,
EPMCC’95, Bologna, Italy, pp. 215—220, Nov. 1995.
[20] D. N. Kalofonos and J. G. Proakis, “Performance of the multistage detector for aMCCDMA
system in a Rayleigh fading channel,” in Proc. IEEE Global Communications
Conf. (GLOBECOM"96), vol. 3, pp. 1784—1788, Nov. 1996.
[21] S. Kaiser and P. Hoeher, “Performance of multicarrier CDMA with channel estimation
in two dimensions,” in Proc. IEEE Symp. Personal Indoor and Mobile Radio
Communications (PIMRC’97), pp. 115—119, 1997.
[22] P. Hoeher, S. Kaiser, and P. Robertson, “Two-dimensional pilot-symbol-aided channel
estimation by Wiener filtering,” in Proc. IEEE Int. Conf. Acoustics, Speech, and
Signal Processing (ICASSP’97), pp. 1845—1848. systems, 1997.
[23] S. Cacopardi, F. Frescura, F. Gatti, and G. Reali, “Channel estimation and tracking
of an indoor orthogonal multicarrier DS-CDMA systemn using measured channel
delay profiles,” in Proc. IEEE Vehicular Technology Conf. (VTC’96), pp. 1559—1563,
1996.
[24] S. Cacopardi, F. Frescura, and G. Reali, “Performance comparison of multicarrier
DS-SS radio access schemes for WLAN using measured channel delay profiles,” in
Proc. IEEE Vehicular Technology Conf. (VTC’97), pp. 1877—1881, 1997.
[25] D. N. Kalofonos, Milica Stojanovic, and J. G. Proakis, “Performance of Adaptive
MC-CDMA Detectors in Rapidly Fading Rayleigh Channel,” IEEE Trans. Wireless
Communications, vol.2, No. 2, pp. 1375-1387, March 2003.
[26] G. L. Stuber, “Principles of Mobile Communication 2/e,” Kluwer Academic Publishers,
2001.
[27] T.S. Rappaport, “Wireless communications 2/e,” Prentice Hall PTR, 2002.
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