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研究生:林孟毅
研究生(外文):Meng-Yi Lin
論文名稱:多輸入多輸出正交分頻多工系統之通道估計法的改良
論文名稱(外文):Improved channel estimation algorithms for MIMO OFDM systems
指導教授:吳國光吳國光引用關係
學位類別:碩士
校院名稱:國立中興大學
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
畢業學年度:96
語文別:中文
論文頁數:59
中文關鍵詞:多輸入多輸出正交分頻多工通道估計
外文關鍵詞:MIMOOFDMchannel estimation
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無線傳輸系統的效能可以透過速率、範圍以及可靠性三種參數來描述。在多輸入多輸出技術(Multi-input Multi-output ; MIMO)出現之前,傳輸速率的增加必須犧牲範圍和可靠性;範圍的擴展則會犧牲速率和可靠性;而提高可靠性則必須降低速率和傳輸範圍。結合了MIMO和OFDM(Orthogonal frequency-division multiplexing)的MIMO-OFDM系統顛覆了上述限制,因為它能同時提升上述三個參數的性能。然而,在MIMO-OFDM系統中的通道估計問題也變得更複雜,需要相當高的計算複雜度,而文獻上的簡化演算法往往會犧牲估計的準確性。在本論文中,我們比較了數種不同的多輸入多輸出正交分頻多工系統之通道估計法,並提出結合通道預測的改良式演算法,能夠大幅提升簡化演算法的估計準確度。
Multiple-input-multiple-output(MIMO)in combination with orthogonal frequency division multiplexing(OFDM)can be used to improve the efficiency of mobile wireless communication systems. Specifically, with MIMO-OFDM, the transmission rate and transmission range can be greatly enhanced at the same bit error rate condition. However, accurate channel parameter estimation will be needed in MIMO-OFDM systems for diversity combining, coherent detection and decoding, which is more complicated than channel estimation in SISO-OFDM systems. In this thesis, we will investigate existing algorithms for MIMO-OFDM channel estimation. Several reduced-complexity algorithms will be examined and we will propose methods to combat the performance degradation of these algorithms arising from some underlying assumptions.
中文摘要 Ⅰ
英文摘要 Ⅱ
目次 III
圖目次 V

第一章 序論....... 1
1.1前言........... 1
1.2研究動機....... 1
1.3論文架構....... 2
第二章 多輸入多輸出正交分頻多工系統. 3
2.1正交分頻多工簡介........ 3
2.2 OFDM系統模型........... 6
2.3多輸入多輸出簡介........ 8
2.4無線通訊的通道模型...... 10
2.5通道之模擬與分析........ 11
2.6線性預測................ 15
第三章 最小均方誤差通道估計演算法..18
3.1基本演算法[12].......... 18
3.1.1複雜度分析............ 21
3.2最佳訓練符元法[13]...... 22
3.3簡化型通道估計[13]...... 24
3.4改良之簡化型通道估計法.. 25
3.5模擬結果................ 25
3.5.1使用實際通道預測之模擬結果..... 26
3.5.2使用預估通道預測之模擬結果..... 28

第四章 適應性通道估計法... 30
4.1適應性通道估計法........ 30
4.2簡化型適應性通道估計法.. 32
4.3改良之簡化型適應性通道估計法..... 33
4.4模擬結果................ 33
4.4.1不同速率下遺忘因子對於MSE影響比較....... 33
4.4.2使用實際通道預測之MSE 模擬結果.......... 35
4.4.3使用實際通道預測之MSE 模擬結果.......... 37
第五章 低計算複雜度通道估計法 40
5.1低計算複雜度通道估計法[14]....... 40
5.2改良之低計算複雜度通道估計法1.... 43
5.3改良之低計算複雜度通道估計法2.... 44
5.4改良之低計算複雜度通道估計法3.... 46
5.5模擬結果....... 48
5.4.1使用實際通道預測之MSE 模擬結果. 48
5.4.2使用估計通道預測之MSE 模擬結果. 52

第六章 結論.......57
參考文獻 ..........58
[1] Thomas F. Quatieri, “ Discrete-Time Speech Signal Processing: Principles and Practice,” , Prentice Hall PTR, 2002.
[2] J. R. Treichler, C. R. Johnson, M. G. Larimore, “ Theory And Design of Adaptive Filters,” Prentice Hall,2001
[3] B. R. Saltzberg, “Performance of an efficient parallel data transmission system ,” IEEE Trans. Commun. Technol., vol. COM-15,pp.805-811,Dec. 1967
[4] S. B. Weinstein and P. M. Ebert, “Data transmission by frequency multiplexing using the discrete Fourier transform,” IEEE Trans Commun. Technol., vol.COM-19, pp.628-634, Oct. 1971
[5] K. Pahlavan, A. H. Levesque, “ Wireless Information Networks”, Wiley-Interscience, 1995
[6] Clark R. H., “A Satatical Theory of Mobile-Radio Reception,”BELL Systems Technical Journal,vol.47,pp957-1000,1968
[7] William C. Jakes, “Microwave Mobile Communications. ”New York : John Wiley & Sons Inc,1975
[8] P. Dent, G. E Bottomley, and T. Croft, “ Jakes Fading Model Revisted ” 24th Electronics Letters,vol.29, no.13, pp.1162-1163,Jun.1993
[9] Harry L.Van Trees, “ Detection, Estimation and Modulation Theory”, John Wiley & Sons Inc,2001
[10] J. J. van de Beek, O. Edfors, M. Sandell, S. K. Wilson, and P. O. B¨orjesson, “On channel estimation in OFDM systems,” Proc. IEEE Vehicular Technology Conf. Chicago, IL, vol. 2, pp. 815-819, July 1995.
[11] M. Jankiraman, “ Space-time codes and MIMO systems”, Artech House,2004.
[12] Y. Li, N. Seshadri, and S. Ariyavistakul, “Channel estimation for OFDM systems with transmitter diversity in mobile wireless channel,” IEEE Journal on Commun., vol. 17, pp. 461-471, Mar. 1999.
[13] Y. Li, “Simplified channel estimation for OFDM systems with multiple transmit antennas,” IEEE Trans. on wireless communications, vol. 1, pp. 67-75, Jan. 2002.
[14] H. Minn, D. I. Kim, and 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.
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