臺灣博碩士論文加值系統

在本論文中，我們研究在合作式的無線通訊系統下(Cooperative Communication System)結合正交分頻多工(orthogonal frequency division multiplexing，OFDM)使頻率選擇性衰減通道簡化為平坦衰減通道。我們分別使用三種空頻碼(space frequency coding，SFC)，討論在頻域下使用迫零(zero forcing)、最小平方錯誤率(minimum mean square error)接收器如何達到合作式的滿分集增益在平坦衰減通道(flat fading channel)下，針對不同的中繼點做系統模擬，從模擬結果中可得知在不同的中繼點數與頻率偏移下三種空頻碼的系統效能。

In this thesis, we study in cooperative wireless communications system that combined Orthogonal Frequency Division Multiplexing (OFDM) to let frequency selective fading channel reduces to a flat fading channel.We are using three space-frequency codes (SFC) to discuss that we use ZF, and MMSE to achieve full cooperative diversity at receiver in the frequency domain.In the flat fading channel,we compared the performance of three space-frequencywhen multi relay nodes exist.

致謝 I
摘要 II
Abstract III
目錄 IV
圖目錄 VI
表目錄 VII
第一章 緒論 1
1.1前言 1
1.2研究目的與動機 1
1.3論文架構 3
第二章 合作式無線通訊系統與正交分頻多工系統架構 4
2.1合作式無線通訊系統概述 4
2.2合作式無線通訊系統 5
2.3分集技術(diversity) 7
2.4正交分頻多工系統簡介 8
2.5離散傅立葉反轉換(IDFT)和離散傅立葉轉換(DFT) 9
2.6正交分頻多工系統基本架構 10
2.7保護區間(GI) 12
第三章 分散式空頻碼 14
3.1分散空頻碼簡介（distributed space frequency coding） 14
3.2多載波頻率偏移下的合作式通信系統模型 14
3.3頻率反轉空頻碼(Frequency-reversal SFC) 19
3.4頻域線性摺積空頻碼(Frequency-domain linear convolutive SFC) 24
3.5 Alamouti空頻碼設計 29
3.6碼率比較 30
3.7檢測器介紹： 30
第四章 模擬結果分析 32
4.1前言 32
4.2系統流程圖 33
4.3模擬一參數與結果 34
4.4模擬二參數與結果 38
4.5模擬三參數與結果 41
第五章 複雜度分析 43
第六章 結論 44
參考文獻 45

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