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研究生:游家賢
研究生(外文):Chia-Hsien Yu
論文名稱:正交分頻多工系統中多天線之單一及多重載波頻率估測
論文名稱(外文):Estimation of Single and Multiple Carrier Frequency Offsets in OFDM Systems with Multiple Antennas
指導教授:馮世邁
口試委員:蘇炫榮蘇柏青
口試日期:2013-07-25
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:電信工程學研究所
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:2013
畢業學年度:101
語文別:英文
論文頁數:50
中文關鍵詞:正交分頻多工載波頻率偏移頻率分析
外文關鍵詞:OFDMCFOFA
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Orthogonal frequency division multiplexing (OFDM) systems are sensitive to the carrier frequency offset (CFO), which degrades the performance of the system. Therefore, CFO estimation is an important issue in OFDM systems. The focus of this thesis is on CFO estimation in OFDM systems. This thesis first extends frequency analysis (FA) method to estimate carrier frequency offset in OFDM systems with more than two transmitting antennas. Then, we extend the FA method to multi-users. Finally, simulation results show the proposed method works in different settings.

List of Figures vii
Abstract ix
Acknowledgements xi
1 Introduction 1
2 CFO in OFDM Systems 5
2.1 Introduction to OFDM Systems . . . . . . . . . . . . . . . . . . . . . 6
2.2 Carrier Frequency Offset . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3 Compensation of CFO . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3 FA method for CFO estimation using OSTBC 13
3.1 Review of OSTBC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2 Review FA CFO estimation SISO-OFDM . . . . . . . . . . . . . . . . 16
3.3 Review FA CFO estimation MISO-OFDM 2Tx . . . . . . . . . . . . . 19
3.4 Extension FA CFO estimation MISO-OFDM >2Tx . . . . . . . . . . 21
3.5 Simulation Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4 Application of FA method in Multi-Users Systems 29
4.1 Block-Type Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.2 Comb-Type Arrangement . . . . . . . . . . . . . . . . . . . . . . . . 34
4.3 Effect of Inter-Carrier Interference . . . . . . . . . . . . . . . . . . . . 38
4.4 Simulation Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5 Conclusion 47
Bibliography 49


[1] Lu Wu, Xian-Da Zhang, Pei-Sheng Li and Yong-Tao Su, "A Closed-form Blind CFO Estimator Based on Frequency Analysis for OFDM Systems," IEEE Transactions on Wireless Communication, vol. 57, pp. 1634-1637, June 2009.
[2] Lars Haring, Stefan Bieder, Andreas Czylwik, and Thomas Kaiser, "Estimation Algorithms of Multiple Channels and Carrier Frequency Offsets in Application to Multiuser OFDM Systems," IEEE Transactions on Wireless Communication, vol. 9, no. 3, March 2010.
[3] E. G. Larsson and P. Stoica, Space-Time Block Coding for Wireless Communications. Cambridge University Press, 2003.
[4] Zhi-Ting Huang, "Estimation of I/Q Imbalance and Carrier Frequency Offset for Orthogonal Space-Time Block Coded OFDM Systems," Master thesis, National Taiwan University, June, 2012.
[5] J. Yu and Y. Su, "Pilot-assisted maximum-likelihood frequency-offset estimation for OFDM systems," IEEE Trans. Commun., vol. 52, pp. 1997-2008, Nov. 2004.
[6] Y. Yao and G. B. Giannakis, "Blind carrier frequency offset estimation in SISO, MIMO, and multiuser OFDM system," IEEE Trans. Commun., vol. 53, pp. 173-183, Jan. 2005.
[7] S. Ahmed, S. Lambotharan, A. Jakobsson, and J. A. Chambers, "MIMO frequency-selective channels with multiple frequency offsets: estimation and detection techniques," IEE Proc. Commun., vol. 152, no. 4, 2005, pp. 489-494.
[8] T. Roman and V. Koivunen, "Subspace method for blind CFO estimation for OFDM systems with constant modulus constellations," in Proc. Vehicular Technology Conference, vol. 2, Stockholm, Sweden, May 2005, pp. 1253-1257.
[9] O. Besson and P. Stoica, "On parameter estimation of mimo flat-fading channels with frequency offsets," IEEE Trans. Signal Processing, vol. 51, no. 3, pp. 602-613, Mar. 2003.
[10] Yi-Fan Jian, "Joint Estimation of I/Q Imbalance and Carrier Frequency Offset Using Pilot Subcarriers for OFDM Systems," Master thesis, National Taiwan University, June, 2011.


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