淡江大學機構典藏:Item 987654321/52500
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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/52500


    Title: 多天線系統在高速度環境下之適應性調變與編碼
    Other Titles: Adaptive modulation and coding for MIMO system in high speed environment
    Authors: 鄭暉弘;Cheng, Hui-hun
    Contributors: 淡江大學電機工程學系碩士班
    李揚漢;Lee, Yang-han
    Keywords: 正交分頻多工;都卜勒;多天線;適應性;調變;編碼;OFDM;Doppler;MIMO;Adaptive;modulation;Coding
    Date: 2010
    Issue Date: 2010-09-23 17:51:44 (UTC+8)
    Abstract: 新一代的通訊系統採用正交分頻多工(Orthogonal frequency-division multiplexing)作為傳輸技術，除了傳輸技術的改變，支援高速移動中的使用者，確保移動時不會有斷話的情形發生，也是新一代通訊系統重要的課題之ㄧ。在移動通道中，都卜勒擴散(Doppler spread)會破壞子載波之間的正交性，將導致子載波間互相干擾(Inter Carrier Interference)，嚴重影響系統效能。

    使用者遠離時，因為與基地台的距離發生變化，導致接收訊號越來越差，此時想要維持良好的服務品質(Quality of Services)，基地台可以利用適應性調變與編碼(Adaptive Modulation and Coding)技術，適時的改變調變與編碼方式，以維持服務品質。

    本論文主要在討論調變(Modulation)、編碼(Coding)以及多天線技術（Multiple-Input Multiple-Output），在高速環境下，對於系統效能的影響，並且提供在不同訊雜比(Signal Noise Ratio)、不同速度下，使用何種調變與編碼的建議表。
    Most generation wireless communication systems are based on Orthogonal frequency-division multiplexing transmission technology. Besides the transmission technology changes, to avoid break down when users communicate by phone and support users in high speed environment are important. In a moving channel, doppler spread will cause inter carrier interference. It will affect performance seriously.

    When the users far away form base station, the received signal will become weak. If we want to keep good quality of services, we can use adaptive modulation and coding technology to change the combination of modulation and coding.

    In this paper, we will discuss the performance in different modulation, coding, and MIMO system in high speed environment and give an adaptive modulation and coding table in different speed and signal noise ratio.
    Appears in Collections:[Graduate Institute & Department of Electrical Engineering] Thesis

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