臺灣博碩士論文加值系統

在本篇論文中，由於無線光通訊系統傳送資料時，會因外在雜訊而發生資料位元的錯誤，為了降低位元錯誤率，我們在資料送出前，利用渦輪碼(Turbo code)這類的前向錯誤更正碼技術，先將資料透過編碼器進行編碼再送出，在接收資料前，也加入對應的解碼器，在編碼器和解碼器上，透過使用FPGA來當作編解碼器硬體，利用MATLAB將編碼與解碼程式分別寫入兩個FPGA，一個FPGA進行資料的編碼，另一個作解碼。
實驗中， 將圖形產生器當作資料輸出來源，把進入FPGA的資料透過MATLAB編碼後，將編碼後的訊號與超發光二極體光源，同時送入電光相位調變器，傳送至光檢測器在經FPGA解碼後，最後送到高頻示波器顯示結果，在傳送資料時，利用渦輪碼將資料編碼，將在傳送過程中有可能發生錯誤的資料，利用渦輪碼進行解碼運算，使資料復原為原本傳送時的資料，並降低位元錯誤率。

In this paper, due to the data transmission in the wireless optical communication system, the data bit error will occur due to external noise. In order to reduce the bit error rate, we use the forward error correction code technology such as turbo code to encode the data through the encoder before sending out the data, and then add the corresponding decoder before receiving the data. In the encoder and decoder, FPGA is used as the hardware of the codec. MATLAB is used to write the encoding and decoding programs into two FPGAs, one for data encoding and the other for decoding.
In the experiment, the graphics generator is used as the data output source. After the data entering FPGA is encoded by MATLAB, the encoded signal and the Super luminescent Diode (SLD) light source are simultaneously sent to the Electro-Optic Modulator(EOM), and then to the photodetector, which is decoded by FPGA, and finally sent to the high-frequency oscilloscope to display the results. When transmitting data, turbo code is used to encode the data, and the data that may be wrong in the process of transmission is decoded by turbo code, so that the data can be restored to the original data, and the bit error rate has been reduced.

摘要.........................................i
Abstract....................................ii
誌謝........................................iii
目錄.........................................iv
表目錄.......................................vi
圖目錄......................................vii
第一章 緒論...................................1
1.1 前言......................................1
1.2 研究動機與目的.............................1
1.3 論文架構...................................2
第二章 光通訊研究背景...........................3
2.1 光纖基本介紹...............................3
2.2 光纖接頭區分...............................3
2.3 超輻射發光二極體............................4
2.4 調變.......................................5
2.7 嵌入式系統..................................9
2.7.1現場可程式化邏輯閘陣列.....................10
2.7.2 Red Pitaya..............................10
2.8 光電檢測器.................................11
第三章 錯誤更正碼介紹與文獻探討..................12
3.1 錯誤更正碼.................................12
3.1.1區塊碼(Block code)介紹....................13
3.1.2卷積碼(Convolution code)介紹..............13
3.2 光通訊介紹.................................16
第四章 實驗內容與討論...........................20
4.1 實驗架構..................................20
4.2 錯誤更正碼之無線光通訊系統架構說明...........20
4.3 FPGA編解碼器程式編寫說明...................21
4.3.1 MATLAB程式編寫中的問題與解決方法..........21
4.3.2 問題解決後編碼器與解碼器程式說明...........24
4.4 實驗結果與數據............................27
4.5 加上位元錯誤的實驗結果與數據................31
第五章 結論....................................38
參考文獻.......................................39
Extended Abstract.............................41

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