English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 64745/64745 (100%)
造訪人次 : 20476692      線上人數 : 361
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋


    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/8137


    題名: 數位電視地面廣播系統之通道估測與等化器設計與實現;Design and Implementation of Channel Estimation and Equalization for DVB-T Receiver
    作者: 林仁傑;Ren-Jay Lin
    貢獻者: 通訊工程研究所
    關鍵詞: 通道估測;數位電視地面廣播;正交分頻多工;通道等化;channel equalization;channel estimation;OFDM;DVB-T
    日期: 2006-06-27
    上傳時間: 2009-09-22 11:19:08 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 正交分頻多工(OFDM)系統具有抵抗多重路徑干擾及頻譜使用效率高等優異特性,其中抵抗多重路徑干擾是藉由循環字首(Cyclic prefix)及多載波之特性以達到免除碼字間干擾(ISI)及載波間干擾(ICI),而頻譜使用效率高則是運用多載波正交特性達到的。在循環字首的保護下,多路徑通道對各載波的影響在於其振幅與相位的失真,因此在個子載波之通道等化只需一個複數係數(One-tap)以修正其失真,而其成功要件則在於各子載波之通道頻率響應估測。 本研究中以實現複雜度許可之前提下,針對DVB-T系統進行穩定通道及快速衰落(移動)通道下之通道估測與等化演算法的模擬與硬體設計實現,其中模擬實現結果亦有助於了解OFDM傳收系統規格,如頻段、頻寬、子載波頻率間隔等與通道狀況對接收性能的影響,且針對典型的通道估測採最小平方法搭配線性內插之缺點,並提出插值濾波器之方法改善通道估測之精確度,進一步提升接收機效能。 OFDM systems exhibit superior characteristics in terms of simplicity in combating multi-path transmission and efficiency in spectral utilization. The effects of ICI and ISI arise from the multi-path interference could be successfully eliminated by the insertion of cyclic-prefix and the use of multi-carriers. Furthermore the advantage of spectral efficiency is achieved by orthogonal property. Under the protection of cyclic-prefix, multi-path effect causes distortion of amplitude and phase only. In accordance with the exact channel estimation among each sub-carrier, the distortion could be compensated by one-tap complex coefficients. With the consideration of hardware implementation, the algorithms of the channel estimation and equalization were investigated and simulated for static channels and fast fading channels for DVB-T system. Moreover, the dependence of the receiving performance upon relationships between channel conditions and system specifications, e.g. transmission band, bandwidth, sub-carrier spacing, etc. would be clarified from simulation results. In contrast to the least-square method with linear interpolation for conventional channel estimator, interpolation filter was proposed to estimate the channel response more accurately, and improve the performance of the receiver further.
    顯示於類別:[通訊工程研究所] 博碩士論文

    文件中的檔案:

    檔案 大小格式瀏覽次數
    0KbUnknown541檢視/開啟


    在NCUIR中所有的資料項目都受到原著作權保護.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回饋  - 隱私權政策聲明