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Student Number 92523015
Author Jung-Yen Peng(彭容彥)
Author's Email Address No Public.
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Department Communication Engineering
Year 2004
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Design and Implementation of a MIMO-OFDM System for WLANs
Date of Defense 2005-07-06
Page Count 61
Keyword
  • Channel Estimation
  • IEEE 802.11n
  • MIMO-OFDM
  • STBC
  • Synchronization
  • WLANs
  • WWiSE.
  • Abstract  Because of the demand of higher transmission data rate and better transmission quality, the MIMO-OFDM technology is the trend of the next-generation WLANs. In the thesis, we design a MIMO-OFDM baseband transceiver with two transmit antennas and two receive antennas based on the WWiSE(World Wide Spectrum Efficiency)Alliance’s IEEE 802.11n proposal. Then the architecture is implemented by VHDL.
     In this thesis, an STBC-OFDM system is described, including the functions of frame detection, symbol timing synchronization, carrier frequency synchronization, and channel estimation. First, each block is discussed individually and the performance is analyzed. Finally, from the system-level simulation results, we show that the proposed MIMO-OFDM receiver offers better performance than the IEEE 802.11a system in an indoor multipath channel.
    Table of Content 1. 緒論1
      1.1 研究背景與動機1
      1.2 章節架構2
    2. 多輸入多輸出正交分頻多工系統(MIMO OFDM)簡介3
      2.1正交分頻多工系統(OFDM)介紹3
      2.2多輸入多輸出系統介紹5
      2.3.STBC -OFDM介紹10
      2.4.WWise1 2
      2.5無線通道模型15
    3. MIMO-OFDM收發機架構及系統模擬16
      3.1系統架構16
      3.2同步(synchronization)20
       3.2.1 封包偵測20
       3.2.2 時序同步22
       3.2.3.載波頻率同步26
      3.3.通道估測(Channel Estimation)37
       3.3.1通道估測演算法37
      3.4  相位誤差對STBC-OFDM系統之影響43
      3.5  系統模擬45
    4.  MIMO-OFDM收發機之電路設計48
      4.1 模擬環境及平台48
      4.2同步(synchronization)49
        4.2.1 封包偵測(Packet Detection)硬體架構49
        4.2.2 時序同步硬體架構52
        4.2.3 載波頻率同步硬體架構54
      4.3  通道估測(Channel Estimation) 硬體架構56
    5. 結論與未來工作59
    參考文獻60
    Reference [1] “Orthogonal Frequency Division Multiplexing,” U.S Patent No.3, 488, 4555, filed Nov.14, 1966, issued Jan.6, 1970.
    [2] S.B.Weinstein and P.M.Ebert,” Data Transmission by Frequency-Division Multiplexing Using the Discrete Fourier Transform,” IEEE Trans. Commun, vol. 19, pp.628-634,Oct.1971.
    [3] R,van Nee and R.praasad,OFDM for Wireless Multimedia Communications,Boston/London:Artech House,1999.
    [4] John Terry and Juha Heiskala, OFDM Wireless LANs: A Theoretical and Practical Guide. Indianapolis, Indiana: Sams, 2002.
    [5] T.S.Rappaport, Wireless Communications: Principles and Practice, Prentice Hall, 1996.
    [6] A. Wittneben, “Base station modulation diversity for digital SIMULCAST,” Proc. 1991 IEEE Vehicular Technology Conf. (VTC 41st), pp. 848–853, May 1991.
    [7] V. Tarokh, N. Seshadri, and A. R. Calderbank, “Space-time codes for high data rate wireless communication: Performance criteria and code construction,” IEEE Trans. Inform. Theory, vol. 44, Mar. 1998.
    [8] S. M. Alamouti, “A simple transmit diversity scheme for wireless communications, “IEEE J. Select. Areas Commun., vol. 16, pp. 1451-1458, Oct. 1998.
    [9] V. Tarokh, H. Jafarkhani, and A. R. Calderbank, “Space–time block codes from orthogonal designs,”IEEE Trans. Inform. Theory, vol. 45, pp. 1456–1467, July 1999.
    [10] P. W. Wolniansky, G. J. Foschini, G. D. Golden, and R. A. Valenzuela, ”V-BLAST: an architecture for realizing very high data rates over the rich-scattering wireless channel,” International Symposium on Signals, Systems, and Electronics, pp. 295-300, Sep. 1998.
    [11] WWise Proposal: High throughput extension to the 802.11 Standard, Jan. 06,2005.
    [12] T,M.Schmidl,D.C.Cox,“ Low-overhead, low-complexity burst synchronization for OFDM,” IEEE International Conference on Communications, vol. 3, pp. 1301-1306, June 1996
    [13] Schenk, T.C.W.; van Zelst, A.; “Frequency synchronization for MIMO OFDM wireless LAN systems”, IEEE Vehicular Technology Conf. 2003-fall, vol 2, 6-9, pp. 781 – 785, Oct. 2003.
    [14] 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
    [15] W. G. Jeon, K. H. Paik, and Y. S. Cho, “An efficient channel estimation technique for OFDM systems with transmitter diversity,” IEICE Trans. Commun., vol. E84-B, no. 4, pp. 967-974, April 2001.
    [16] Slimane Ben Slimane,”Channel estimation for HIPERLAN/2 with transmitter diversity,” ICC 2002 - IEEE International Conference on Communications, vol. 25, no. 1, pp. 26 – 30,April 2002,
    [17] R. Andraka, “A survey of CORDIC algorithms for FPGA based computers,” ACM/SIGDA 6th International Symposium of FPGA, pp. 191– 200, Feb 1998.
    Advisor
  • Dah-Chung Chang(張大中)
  • Files
  • 92523015.pdf
  • approve in 1 year
    Date of Submission 2005-07-20

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