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Student Number 81345015
Author Che-Shen Yeh(葉哲勝)
Author's Email Address No Public.
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Department Computer Science and Information Engineering
Year 1999
Semester 2
Degree Ph.D.
Type of Document Doctoral Dissertation
Language zh-TW.Big5 Chinese
Title A study of channel estimation for OFDM systems
Date of Defense 2000-12-27
Page Count 116
Keyword
  • channel estimation
  • OFDM
  • Abstract The orthogonal frequency division multiplexing (OFDM) system has been widely adopted in both wire line and wireless communication systems, such as ADSL, DAB, DVB-T, Japanese ISDB, ETSI HiperLAN2, IEEE802.11. In OFDM systems channel fading effects are eliminated by the equalization of received signals, where the equalizer coefficients are determined according to results of channel estimation process. The channel estimation is usually accomplished in the frequency domain by inserting pilot tones in OFDM symbols.
    In this dissertation, channel estimations of OFDM systems in the time-domain for both slow fading and fast fading channels are investigated. Three time-domain channel estimation methods are proposed in this dissertation as follows:
    1.Frequency domain Pilot Time domain Average (FPTA)
    2.Time domain Pilot Time Cross-correlation(TPTC)
    3.Time domain Pilot Time Cross-correlation with Time varying Estimation. (TPTCTE)
    Theoretical analysis reveals that a higher P/N ratio can be obtained with proposed estimation methods. It is also demonstrated from computer simulations, under assumptions of multipath distortion and AWGN channel, the proposed estimation techniques can outperform the conventional estimation techniques in which the channel response is estimated in the frequency domain.
    The simulations in this dissertation employ some practical fading channel models of digital transmission. One of these models used is obtained by experimental results of the field-testing of the Digital Television (DTV) related activities of Taiwan. Other channel models used are recommended by the Advanced Television Test Center (ATTC) in the U. S. A. and by the Digital Audio Broadcasting (DAB) project in Europe, with both static and dynamic multipath distortions.
    The simulation results reveal that the proposed time-domain channel estimation techniques can perform better than the conventional frequency domain channel estimation technique. The proposed FPTA and TPTC techniques have advantages of low computational complexity and high P/N ratio. The simulation results also demonstrate that the TPTCTE method can improve the performance especially for time varying channel and can reduce the SER error floor. In TPTCE a novel channel estimation and compensation scheme for fast fading channel is employed for OFDM systems using time domain training sequence. Which results in a better performance for both slow fading and fast fading environments.
    Table of Content Abstract7
    1. Introduction9
    2. Description of OFDM Channel Models16
    2.1 Static Reception Channel Model16
    2.2 Mobile Reception Channel Model22
    3. Channel Estimation over Slow Fading Channel31
    3.1 Description of the Channel Estimation Methods 31
    3.2 Analysis of Pilot to Noise Ratio35
    3.3 Performance Comparison and Discussion40
    4. Channel Estimation over Fast Fading Channel64
    4.1 Description of the Channel Estimation Methods 64
    4.2 Performance Comparison and Discussion74
    5. Conclusion84
    References88
    Publication List94
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    11. H. Sari, G. Karam, and I. Jeanclaude “ Frequency domain equalization of mobile radio and terrestrial broadcast channels”. Global Telecommunication Conference IEEE published, Vol. 1, pp. 1-5, 1994.
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    27.William Y. Zon, Yiyan Wu and Michele Gwillet“Analyses of ATV Transmission Subsystem Field Test Data”, IEEE Transactions on Broadcasting Vol. 42, No. 1. March 1996, pp.1~9
    28.Che-Shen Yeh, Shih-Jack Chang, Chiung-Jang Chen, Yinyi Lin, “Digital Television Development in Taiwan”, IEEE International Symposium on Consumer Electronics, October 1998. pp. TPA1-01~06.
    29.C.S.Yeh and Y. Lin “Channel Estimation Using Pilot Tons in OFDM Systems” IEEE Trans. on Broadcasting Dec.1999, Vol. 45, Number 04 PP. 400~409
    30.“Digital Video Broadcasting (DVB) Framing structure, Channel Coding and Modulation Digital Terrestrial Television (DVB-T)” ETS 300 744, v1.2.1, June 1999.
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    35.M.-S. Kang and W.-J. Song “A robust channel equalizer for OFDM TV receivers” IEEE Transactions on Consumer Electronics, vol.44, no.3, pp. 1129-1133, August 1998.
    36.Che-Shen Yeh, Yinyi Lin and Yiyan Wu “OFDM System Channel Estimation Using Time-Domain Training Sequence for Mobile Reception of Digital Terrestrial Broadcasting”本篇論文於89年8月被IEEE Broadsting Technology Society 所接受。
    37.Che-Shen Yeh, Yinyi Lin and Yiyan Wu“Channel Estimation in OFDM Systems for Terrestrial Broadcasting”本篇論文於89年9月被IEICE Communication society所接受。
    38.Che-Shen Yeh, Chiung-Jang Chen, Chih-Cheng Cho, Yinyi Lin“Digital Television Development in Taiwan” 1998 IEEE International Symposium on Consumer Electronics (isce’98), PP. TAP1-01-06
    39.Che-Shen Yeh, Shih-Jack Chang, Chih-Cheng Cho, Yinyi Lin “The DTV field tests and the channel model analysis (C-10)” Proceedings of the Second (1999) Radio Science Symposium National Central University December, 20~21, 1999 Chung Li, Taiwan, R. O. C. PP. 117~130
    40.葉哲勝、林銀義、陳瓊璋、張世傑、卓志成 “數位通信系統中單載波與多載波傳輸性能之研究”(1998/10)第四屆電腦與通信技術研討會PP. .405 ~ 410
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    45.J-J van de Beek, O. Edfors, M. Sandell, S. K. Wilson and P. O. Brjesson, “On channel estimation in OFDM systems,” Vehicular Technology Conf., 1995, pp. 815-819.
    Advisor
  • Yin-Yi Lin(林銀議)
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    Date of Submission 2000-12-27

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