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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/8033

    Title: 使用MMSE等化器的Filterbank OFDM系統探討;The Investigation of Filterbank OFDM Systems with MMSE Equalization
    Authors: 李達龍;Da-Long Lee
    Contributors: 通訊工程研究所
    Keywords: IEEE 802.11a;多載波調變;MMSE 等化器;正交分頻多工系統;濾波器組;multicarrier modulation;MMSE equalization;OFDM;Filterbank;IEEE 802.11a
    Date: 2004-10-07
    Issue Date: 2009-09-22 11:16:20 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 在本篇論文中將討論使用filterbank的多載波系統應用於無線室內的環境中。使用filterbank取代DFT做為OFDM系統的主要目的為其較佳的頻譜特性,能夠降低interchannel interference (ICI),甚至可以省去CP,增加OFDM傳輸效率。我們首先討論filterbank設計參數的選定; 接著提出三種具MMSE等化器的接收機架構,並對這三種等化器組態的特性做探討及比較。此外,將使用MMSE等化器的Filterbank OFDM系統,和現行的IEEE 802.11a系統做比較。整個模擬環境設定參考 IEEE 802.11a 之 OFDM 系統規格設計,採用 64點 FFT 系統之次頻帶。雜訊源和通道考慮 AWGN 和 Multipath Fading,另外我們將考慮 narrowband interference 之影響。結果顯示了Filterbank-based 多載波通訊系統具有較為優越的傳輸性能,但須付出較高複雜度和較長之訓練序列。 In this thesis we investigate the use of the filterbank-based multicarrier communication system in the indoor environment. The filterbank-based system as opposed to DFT OFDM, is that the property of low sidelobe in filterbank can reduce intercarrier interference which is typically serious for some situations in OFDM. First, the choice of the filterbank design parameters is discussed. The receiver characteristics of different equalization structures are studied, and their complexity and performance are compared as well. Finally, the IEEE 802.11a OFDM system is compared with the filterbank-based multicarrier proposal. A quasi-static channel is used and the noise considers narrowband interference and AWGN. The results show that the performance of filterbank-based system is superior to the IEEE 802.11a OFDM system with the penalty of complexity and longer training sequence.
    Appears in Collections:[通訊工程研究所] 博碩士論文

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