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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/9032


    Title: 多載波調變信號之濾波器組、載波數估測與載波回復系統設計
    Authors: 呂國賢;Guo-Hsai Lu
    Contributors: 電機工程研究所
    Keywords: 多載波調變
    Date: 2000-06-19
    Issue Date: 2009-09-22 11:39:49 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 由於多載波調變方式能夠達到較大的頻寬效益,得到較高的資料傳輸率,因此近年來有些數位傳輸系統多採用多載波調變方式,而非傳統的單載波技術,例如在無線通訊方面的窄頻個人通訊服務(PCS)的應用,和多載波碼分多工(CDMA);而在有線通訊方面的高速數位用戶迴路(HDSL)亦採多載波調變技術。 本論文乃考慮多載波調變信號在加成性高斯雜訊環境下,接收端已知各個載波頻率時,設計接收系統之濾波器模組,濾出各個單一載波訊號,供後續系統使用;載波數估側模組,考慮載波數目為一變化值,偵測多載波調變訊號之載波數;載波回復模組,回復載波因受雜訊、通道影響,產生的相位偏移,。此外藉由電腦模擬,了解系統效能,且提供系統中模組參數的設定。 本論文將提供接收系統之系統設計及完整的接收運作流程,並針對濾波器組、載波數估測、和載波回復的設計有詳盡的討論,並進行電腦模擬作效能的評估。 In the recent past, multi-tone modulation has generated a lot of research interest. Multi-tone Modulation superimposes several carrier- modulated waveforms in parallel subchannels in order to increase the data rate on a channel. Much of the research in this area has focused on providing maximal bandwidth efficiency and has therefore employed M-ary phase shift keying or quadrature amplitude modulation (MPSK and QAM, respectively) on the subcarriers. In this thesis, we discuss how to design a receiving system of multi-tone modulated signals when the carrier frequencies of received signals were known. We design the filter-bank module to filter the every single signal of multi-tone signal. It is necessary to ascertain much of carriers that multi-tone modulated signal have .So we design the carrier-number detection module in the receiving system to detect the carriers. Then we design the carrier recovery module to track the phase offset of single signal in the subchannels.
    Appears in Collections:[電機工程研究所] 博碩士論文

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