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    题名: 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
    贡献者: 通訊工程研究所
    关键词: 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
    上传时间: 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.
    显示于类别:[通訊工程研究所] 博碩士論文

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