本篇論文中對正交多工調變訊號作一探討研究，此正交多工調變訊號分為二種基本的型式分別為正交多工正交相位調變訊號[1]和正交多工正交幅調變訊號[2]，而正交多工調變訊號包含現有已存在的調變型式，如正交多分頻多工(Orthogonal Frequency Division Multiplexing)及尚未發現的調變型式，論文中即針對正交多工調變訊號進行差異性錯誤保護架構的研究。我們在論文中提出差異性傳送功率和差異性編碼率二種架構。在論文中針對差異性傳送功率架構，推導出根據傳送資料重要性最佳的傳送功率分配方式並評估其系統效能趨勢。最後在差異性編碼率架構中，以不同碼率的里德-所羅門碼(Reed-Solomon Codes)對不同重要性的傳送資料進行不同程度的錯誤保護，並在相同的冗餘度下與使用相同編碼率比較，進一步去討論其效能。

Orthogonally Multiplexed Modulation signals are investigated in this thesis .The research focus is on the application of the unequal error protection to the Orthogonally-Multiplexed Modulation signals. First , the energy allocation among the component signals of Orthogonally Multiplexed Modulation is optimized by minimizing a modified symbol error function in AWGN channel and the scheme performance is observed. Second, the different R-S coding rate for the component signals of Orthogonally Multiplexed Modulation is used. The performance comparison between using the same R-S coding rate and using the different R-S coding rate Orthogonally Multiplexed Modulation system is presented.

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