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研究生： 朱柏安
Chu, Po-An
論文名稱： LTE下行傳輸系統之有效通道估測方法
An Efficient Channel Estimation Algorithm for LTE Downlink Systems
指導教授： 張名先
Chang, Ming-Xian
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 電腦與通信工程研究所
Institute of Computer & Communication Engineering
論文出版年： 2013
畢業學年度： 102
語文別： 英文
論文頁數： 33
中文關鍵詞： 長期演進技術 、參考訊號 、通道估測 、通道響應
外文關鍵詞： LTE, reference signals, channel estimation, channel response
相關次數： 點閱：130  下載：2 
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    • 在長期演進技術(Long term evolution, LTE)中，接收端需要知道通道資訊來等化通道的效應，以降低多重路徑對訊號的干擾。其參考訊號是作為通道估測之用，我們在LTE系統下利用參考訊號，來估測頻域之通道響應。
    此篇論文將通道估測分為一維和二維兩種方法。我們在LTE技術的下行傳輸系統中，採用LTE的通道環境以及通道估測所用的參考訊號，來做一維和二維的估測。我們討論一種複雜度低，且沿著頻域和時域來做二維的通道估測，最後二維的方法獲得比一維的方法更好的估測結果。

    In long term evolution (LTE) systems, the receiver needs the information of the fading channel to equalize the received signal and mitigate the associated interference. Reference signals are used as pilots to aid the channel estimation. We estimate the channel frequency response by the reference signals in the LTE environment.
    In this thesis, we use one-dimensional (1D) and two-dimensional (2D) channel estimations. We consider the downlink channel in the LTE system and use reference signals to implement 1D and 2D channel estimations. We study low-complexity channel estimation algorithms based on time-domain and frequency-domain pilot signals. The 2D approach achieves better performance.

    Chinese Abstract……I English Abstract……II Acknowledgement……III Contents……IV List of Tables……VI List of Figures……VII Chapter 1 Introduction……1 1.1 Motivation……1 1.2 Organization of this thesis……2 Chapter 2 OFDM System and Channel Model……4 2.1 Orthogonal Frequency Division Multiplexing (OFDM)……4 2.3 Channel Model……6 2.3.1. Jake’s Rayleigh Fading Model……6 2.3.2. Multipath Model……7 Chapter 3 LTE Downlink System……9 3.1 Downlink Structure ……9 3.1.1. Slot Structure and Physical Resource Elements……9 3.1.2. Modulation……11 3.2 Pilot Structure ……13 3.2.1. Mapping to Resource Elements……13 3.2.2. Sequence Generation……14 Chapter 4 Channel Estimation.……16 4.1 1D Frequency-Domain Approach For Channel Estimation……16 4.1.1. Least-Squares Fitting - Polynomial (LSF-Poly.)……18 4.1.2. Least-Squares fitting - Channel Impulse Response (LSF-CIR) ……21 4.2 2D Frequency-Domain Approach for Channel Estimation……22 4.3 Simulation Result……29 Chapter 5 Conclusion……32 Bibliography……33

    [1] 3GPP TS 36. 211: Evolved Universal Terrestrial Radio Access (E-UTRA), Physical channels and modulation. Release 9, (2010-03).
    [2] M. X. Chang and Y. T. Su, “2-D regression channel estimation for equalizing OFDM signals,” Proc IEEE 51th Vehicular Technology Conference, Tokyo, pp. 240-244, May 2000.
    [3] M. X. Chang and Y. T. Su, “Model-based channel estimation for equalizing OFDM signal,” IEEE Trans. Commun., vol. 50, pp. 240-544, Apr. 2002.
    [4] Y. Li, and X. Huang, “The Simulation of Independent Rayleigh Faders,” IEEE Trans. Commun., vol. 50, NO. 9, pp. 1503-1514, Sept. 2002.
    [5] M. X. Chang and Y. T. Su, “Performance Analysis of Equalized OFDM System in Rayleigh Fading,” IEEE Trans. Commun., vol. 1, NO. 4, October 2002.
    [6] Ming-Xian Chang "A new derivation of least-squares-fitting principle for OFDM channel estimation", Wireless Communications, IEEE Transactions on, pp. 726 - 731 Volume: 5, Issue: 4, April 2006.
    [7] J. Zyren and W. McCoy, “Overview of the 3GPP Long Term Evolution Physical Layer,” Freescale Semiconductor, Inc., white paper, July 2007.
    [8] Ming-Xian Chang and Ren-Shian Chen, “The Karhunen-Lo`eve Expansion of 1D and 2D OFDM Channel Responses,” Vehicular Technology Conference (VTC Fall), 2011 IEEE, pp. 1-6, Sept. 2011.
    [9] Subin Wang, Chunjing Hu, Tao Peng and Wenbo Wang, “A Low Complexity Channel Estimation Approach of LTE Downlink System,” Communication Technology (ICCT), 2012 IEEE 14th International Conference on, pp.143-147, Nov. 2012.

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