臺灣博碩士論文加值系統

在這篇論文中，我們研究關於正交分頻多工器(orthogonal frequency division multiplexing)裡的峰值均值比(PAPR)的降低方法。我們使用一個有限制的通道模型，藉由監控傳輸序列的部分自相關值(partial autocorrelation)，使得有可容忍的峰值均值比的傳輸序列可以通過。同時建立轉變圖(transition diagram)來表示這個有限制的通道。最後提出一些模擬的結果。
正交分頻多工 (orthogonal frequency division multiplexing) 系統的發展可以追溯到50年代。由於數位信號處理器(DSP)以及超大型積體電路(VLSI)技術的成熟，使得正交分頻多工系統中的高速FFT以及IFFT演算法的晶片設計變的可行。因此正交分頻多工系統廣泛的應用在目前以及未來的高速傳輸系統上。
正交分頻多工系統有著很大的峰值均值比，會導致高代價的非線性功率放大器。目前有許多關於這方面的研究。主要的方法包括了selective mapping，partial transmit sequence以及Golay complementary sequences等等。這些方法在降低峰值均值比上都有不錯的結果，但是同時也存在著一些限制。
我們在這篇論文中最主要的工作是研究一個有限制的通道模型，經過控制輸入序列的部分自相關值(partial autocorrelation)，限制能夠通過的輸入序列。同時提出這個有限制通道模型的籬笆結構以及轉變圖結構。最後根據提出來的有限制的通道模型，我們做了一些模擬。並且提出將來的研究方向。

中文摘要…………………………………………………………………1
誌謝………………………………………………………………………2
目錄………………………………………………………………………3
第一章 簡介……………………………………………………………..4
第二章 正交分頻多工系統的簡介……………………………………..5
第三章 正交分頻多工系統中的峰直均值比問題……………………..6
第四章 有限制的通道模型……………………………………………..7
第五章 結論與未來工作………………………………………………..8
附錄 英文論文範本……………………………………………………..9

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