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研究生： 陳怡昌
I-Chang Chen
論文名稱： 適應性正交多工調變訊號之研究
Adaptive Modulation Technique using OMOM
指導教授： 鐘嘉德
Char-Dir Chung
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 通訊工程學系
Department of Communication Engineering
畢業學年度： 91
語文別： 中文
論文頁數： 86
中文關鍵詞： 仲上衰減 、頻譜增益 、適應性調變 、正交多工正交調變 、切換邊界
外文關鍵詞： Adaptive modulation, Nakagami fading, spectral efficiency, region boundary, OMOM
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    • 本論文針對一新型的調變家族--正交多工正交調變家族[4][5]使用適應性調變技術，包括可變速率可變功率、固定傳送功率以及固定調變參數三種不同的方式，在維持一定平均位元錯誤率的要求之下，根據通道狀況選擇適合的調變參數或是傳送功率，使系統有最佳化的頻譜效益。考慮非擇頻平緩衰減通道為仲上衰減通道時，找出所使用調變參數間最佳化的切換邊界以及最佳化的傳送功率。最後可發現可變速率可變功率方式會有較高的頻譜效益，但也會需要較大的傳送功率。

    In this thesis, we consider a novel class of Orthogonally-Multiplexed Orthogonal Modulation(OMOM)[4][5] by using adaptive modulation technique including three methods of variable-rate variable-power, constant power and constant rate. Under average bit error rate constraint, we choose suitable parameter of OMOM or transmitted power to maximize spectral efficiency according to the channel quality. Considering the frequency-nonselective, slowly Nakagami-fading channel, we find the optimal switch boundary and adapted power of each used modulation parameter. We can find that the variable-rate variable-power method get larger spectral efficiency, but it need larger transmitted power.

    圖表索引 iii 第一章 緒論 1 1.1 適應性調變技術的發展與趨勢………………………1 1.2 研究動機………………………………………………3 1.3 論文架構………………………………………………4 第二章 調變系統模型 5 2.1 正交多工正交振幅調變訊號模型……………………6 2.2 正交多工正交相位調變訊號模型……………………14 2.3 正交多工正交調變訊號之位元錯誤率………………17 第三章 適應性正交多工正交調變技術 25 3.1 適應性正交多工系統模型……………………………26 3.2 可變速率可變功率……………………………………32 3.3 固定傳送功率…………………………………………36 3.4 固定調變參數…………………………………………39 第四章 數值結果 41 4.1 可變速率可變功率之數值結果………………………42 4.2 固定傳送功率之數值結果……………………………54 4.3 固定調變參數之數值結果……………………………62 第五章 結論 69 中英對照表 I 參考文獻 IV

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