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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/72001

    Title: 中國地面數位電視廣播單載波規格訊號 之通道估測與等化;Channel Estimation and Equalization for Single-Carrier Modulation Signal in China DMB-T/H
    Authors: 孫詠星;Sun,Yung-Hsing
    Contributors: 通訊工程學系
    Keywords: 數位電視廣播;時域同步正交分頻多工;單載波調變;PN序列;小數時間延遲;決定回授等化;DTMB;TDS-OFDM;SCM;PN-sequence;Fractional delay;DFE
    Date: 2016-08-18
    Issue Date: 2016-10-13 14:11:13 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 中國地面數位電視廣播DMB-T/H目前已被ITU列為國際正式標準之一,採用時域同步正交分頻多工調變技術(TDS-OFDM),其特點為利用保護區間放置PN序列實現快速同步與通道估測的能力,在資料部分有單載波以及多載波兩種調變模式,其中單載波調變並利用頻域等化方法(SC-FDE)在過去幾年中常被提出討論,此一傳統架構擁有較低的峰對峰值比(PAPR)和對相位誤差較不敏感等特點,適合拿來用作HDTV廣播系統或水下通訊等應用,但卻較無法對抗深度的頻率衰減通道。本論文針對單載波的規格訊號,使用PN595作為保護區間,探討通道估測與等化的課題。
    ;Chinese Digital Terrestrial Multimedia Broadcast (DTMB), Previously known as DMB-T/H (Digital Multimedia Broadcast-Terrestrial/Handheld), has now been listed as one of the official international DTTB (Digital Terrestrial Television Broadcasting) Standard. Use time-domain synchronous orthogonal frequency division multiplexing modulation technique (TDS-OFDM), which is characterized by using PN sequence as guard interval, having the ability to achieve fast synchronization and channel estimation. In the frame body (FB) there are two kinds of modulation mode, single-carrier and multi-carrier in which a single carrier modulation and frequency domain equalization method (SC-FDE) has raised for discussion in the past few years, this traditional architecture has a lower peak-to-peak ratio (PAPR) and less sensitive to the phase error, which is suitable for applications such as HDTV broadcasting or underwater communications system, but it cannot be against the frequency doubly selective channel.
    In this paper, we discuss the channel estimation and equalization for the single-carrier specification signal, using PN595 as a guard interval. Channel estimation mainly dependent on the PN sequence, after its removed and the system is equivalent to the ZP-OFDM and compatible to its equalization algorithm. And we consider more practical situation to improve simulation accuracy by using upsampling, at the same time channel delay time is not on integer symbol period time, and there has sidelobe effect by the pulse-shaping filter which is resulting from the channel fractional delay after sampling at the receiver, will affect system performance.
    Therefore we compare different channel estimation and equalization algorithms for particular channel model represented different classic situation and design the receiver, using computer simulation and observation of details, hope to adjust the parameters to achieve the effect of reducing the complexity and improve performance.
    Appears in Collections:[通訊工程研究所] 博碩士論文

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