本篇論文中，我們討論當CAP調變訊號或OFDM調變訊號進入可見光通訊系統時，受到系統通道干擾，造成通道響應的影響，並且進一步利用線性等化器解調訊號，之後更進一部討論當訊號受到非線性效應影響時，利用非線性沃爾泰拉(Volterra)等化器對受到非線性效應的調變訊號進行解調，並討論可見光通訊裡的一些重要參數改變對於等化器以及整個系統的影響，做進一步的分析與探討。

This thesis discusses the channel effects of a visible light communication system on signal performance, when carrier-less amplitude phase (CAP) or orthogonal frequency-division multiplexing (OFDM) modulation scheme is employed. To mitigate the channel effects and interference, which is mainly caused by an LED, this thesis applies linear and Volterra equalizer to equalize the signals, and studies the effects of the filter parameters on the visible light communication system.

中文摘要 i
致謝 iii
目錄 iv
圖目錄 vi
第一章 緒論 1
1.1簡介 1
1.2研究動機 2
第二章 OFDM 與CAP訊號運用於VLC系統 3
2.1 可見光通訊(VLC ,Visible Light Communication) 3
2.2 可見光通訊系統之應用 5
2.3 可見光通訊之發射端與接收端 6
2.4 正交分頻多工(OFDM ,Orthogonal frequency-division multiplexing) 9
2.4.1正交分類多工(OFDM)簡介 9
2.4.2 正交分類多工(OFDM)調變 11
2.4.3正交分類多工(OFDM)優點與缺點 12
2.5無載波振幅相位調製訊號(Carrierless amplitude phase modulation) 14
2.5.1 CAP 簡介 14
2.5.2 CAP 調變 15
2.5.3 CAP 優點與缺點 18
第三章 等化器 20
3.1 等化器簡介 20
3.2 線性等化器 22
3.3 等化器之預估方法 28
3.4演算法 29
3.4.1 Wiener演算法 29
3.4.2 LMS (Least-Mean-Square)演算法 32
3.4.3 RLS (Recursive Least Squares)演算法 34
3.4.4 演算法比較 37
3.5 沃爾泰拉等化器(Volterra) 等化器 38
第四章 非線性系統與等化器之模擬 40
4.1非線性架構 40
4.2 模擬過程 40
4.3 模擬結果 42
第五章 VLC 實驗系統 50
5.1沃爾泰拉等化器解調非線性偏壓區 50
5.2 解調訊號峰值比分析 58
5.3 可見光通訊距離(h)與等化器應用分析 60
5.4調變訊號 OFDM與CAP比較 67
第六章 結論 70
第七章 Reference 71

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