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研究生:黃伯廷
研究生(外文):Po-Ting Hwang
論文名稱:多輸入多輸出正交分頻多工系統之調適性通道估測
論文名稱(外文):An adaptive channel estimation scheme for MIMO OFDM system
指導教授:陳永芳陳永芳引用關係
指導教授(外文):Yung-Fang Chen
學位類別:碩士
校院名稱:國立中央大學
系所名稱:通訊工程研究所
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:英文
論文頁數:61
中文關鍵詞:調適性通道估測訓練序列遞迴最小平方演算法多輸入多輸出正交分頻多工
外文關鍵詞:MIMO OFDMRLStraining sequenceadaptive channel estimation
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多輸入及多輸出正交分頻多工系統能在無線通訊中增加傳送資料容量。而對於頻率選擇性的衰退通道下,系統需要知道通道的參數資訊,以便於解回傳送的信號。本論文中,我們提出一種使用最佳訓練序列(training sequence)的調適性遞迴最小平方演算法(RLS)去估測通道,以改進其效能及降低複雜度。它是利用先前我們已經計算出的通道參數去幫助我們估測通道,而不去計算複雜度較高的反矩陣。最後,模擬結果也顯示出在較低的信號雜訊比(SNR)和較小的都卜勒頻率下,有較佳的均方誤差(MSE)和位元錯誤率(BER)。
Multiple-input and multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems can be used to increase capacity in wireless communication. For the frequency-selective fading channel in wireband system, it is required to know the knowledge of channel parameters. In this thesis, we propose an adaptive recursive least-square (RLS) algorithm using optimum training sequences for channel estimation to improve the performance and reduce the complexity. Instead of tracking a large matrix inversion, we exploit the information of channel parameters that we have calculated to estimate the channel. Simulation results prove that the mean square error (MSE) performance of channel estimation and bit error rate (BER) are better with low signal- to-noise ratio (SNR) and low Doppler frequency.
Contents
Contents I
List of Figures III
Chapter 1 Introduction 1
1.1 Motivation 1
1.2 Organization 3
Chapter 2 Introduction to OFDM Architecture 6
2.1 Multicarrier Modulation 6
2.2 OFDM Introduction and Block Diagram 7
2.3 Design of the OFDM Signal 10
2.3.1 Guard Interval 11
2.3.2 Windowing 12
2.4 Advantages and Disadvantages of OFDM System 13
Chapter 3 MIMO OFDM System Model 14
3.1 MIMO OFDM System Model 14
3.2 Characteristics of Time-Varying Channel Statistic 15
3.2.1 Multipath Propagation 15
3.2.2 Channel Statistics 17
3.2.3 Delay Profiles 19
3.3 Channel Equalization and Signal Demodulation 21
Chpater 4 Adaptive Channel Estimation 24
4.1 Basic of Channel Parameter Estimation 24
4.2 Optimum training sequence 27
4.3 Adaptive Channel Estimation 28
Chapter 5 Simulation Results 33
5.1 Description of Simulation 33
5.2 Simulation Results 34
5.2.1 Comparison between different adaptive channel estimation algorithms 34
5.2.2 Comparison between different channel estimation algorithms 44
Chapter 6 Conclusions 58
REFERENCE 59
[1] Y. (G) Li, N. Seshadri, and S. Ariyavisitakul, “Channel estimation for OFDM systems with transmitter diversity in mobile wireless channels,” IEEE J. Select. Areas Commun., vol. 17, pp. 461-471, Mar. 1999.
[2] Y. (G) Li, “Simplified channel estimation for OFDM systems with multiple transmit antennas,” IEEE Trans. Wireless Commun., vol. 1, pp. 67-75, Jan. 2002.
[3] I. Barhumi, G. Leus, M. Moonen, “Optimal training design for MIMO OFDM systems in mobile wireless channels,” IEEE Trans. Signal Processing, vol. 51, pp.1615-1624, June 2003.
[4] Y. (G) Li, L. J. Cimini Jr., and N. R. Sollenberger, “Robust channel estimation for OFDM systems with rapid dispersive fading channels,” IEEE Trans. Commun., vol. 46, pp. 902-915, July 1998.
[5] H. Sari, G. Karam, and I. Jeanclaude, “Transmission techniques for digital terrestrial TV broadcasting,” IEEE Commum. Mag., vol. 33, pp. 100-109, Feb. 1995.
[6] H. Minn, D. I. Kim, V. K. Bhargava, “A reduced complexity channel estimation for OFDM systems with transmit diversity in mobile wireless channels,” IEEE Trans. Commun., vol. 50, pp. 799-807, May 2002.
[7] R. Steele, Mobile Radio Communications. New York: IEEE Press, 1992.
[8] M. D. Batariere, J. F. Kepler, T. P. Krauss, S. Mukthavaram, J. W. Porter, F. W. Vook, “An experimental OFDM system for broadband mobile communications,” in Proc. 54th IEEE Veh. Technol. Conf., pp. 1947-1951, Oct. 2001.
[9] IEEE 802.11a, “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: High-speed Physical Layer in the 5 GHZ Band,” IEEE 802.11a, 1999.
[10] J. G. Proakis, “Digital Communication,” 4th ed., New York, McGraw-Hill, 2000.
[11] S. Haykin, “Adaptive Filter Theory,” 4th ed., Prentice Hall, Englewood Cliffs, NJ. 2002.
[12] K. Witrisal, “OFDM Air-Interference Design for Multimedia Communications,” Ch. 4, Ph. D. Thesis, Delft University of Technology, The Netherlands, April 2002.
[13] J. Mannerkoski, D. P. Taylor, “Blind equalization using least- squares lattice prediction,” IEEE Trans. Signal Processing, vol. 47, pp. 630-639, Mar. 1999.
[14] L. Tong, G. Xu, and T. Kailath, “Blind identification based on second-order statistic: A frequency-domain approach, ” IEEE Trans. Inform. Theory, vol. 41, pp. 329-334, Jan. 1995.
[15] S. Coleri, M. Ergen, A. Puri, A. Bahai, “Channel estimation techniques based on pilot arrangement in OFDM systems,” IEEE Trans. Broadcasting, vol. 48, Sept. 2002.
[16] M. Engels, “Wireless OFDM Systems: How to make them work?” IMEC, Belgium, 2002.
[17] R. Van Nee, R. Prasad, “OFDM for Wireless Multimedia Com- munications,” Artech House, Boston-London, 2000.
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1. 江明修、梅高文(2003),自律乎?他律乎?--財團法人監督機制之省思,中國行政評論,12(2),頁 137-160。
2. 林江亮、張秋桂、黃美玲(2004),非營利組織稅務問題之研究,財稅研究,36(2),頁12-25。
3. 陳依蘋(2002),透明度與企業價值,會計研究月刊,200,頁48-54。
4. 葉銀華(2002),從台灣上市公司網站資訊揭露看透明度,會計研究月刊,200,頁70-77。
5. 許崇源(2001),我國非營利組織責任及透明度提升之研究-德爾菲法之應用,中山管理評論,9(4),頁540-566。
6. 許崇源(2001),我國非營利組織責任及財務公開問題研究-非營利組織應加強公開並研訂一般公認會計原則,主計月刊,550,頁43-47。
7. 許治文、高子荃(1998),我國壽險業財務資訊公開化之研究,和春學報,5,頁193-203。
8. 劉玉珍、李怡宗、黃寶慧(2004),市場管理制度創新與行為財務學:資訊揭露制度設計的政策意涵,證券暨期貨月刊,22(4),頁4-14。
9. 張振山、包幸玉(2004),我國資訊公開制度之探討,證券暨期貨月刊,22(4),頁15-24。
10. 蔡彥卿(1991),中美財務揭露系統管制之比較(下)─支持管制「財揭露系統」的理由及建議,會計研究月刊,64,頁52-55。
11. 鄭明慧、范以端(1999),各國金融機構財務業務資訊公開揭露現況,存款保險資訊季刊,12(3),頁122-162。
12. 顏信輝、鄭程鴻(2001),我國企業使用網際網路報導財務資訊之研究,當代會計,2(2),頁147-168。
13. 賴英照(1989),證券交易法逐條釋義,第二冊,實用稅務出版社,民國78年。
 
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