由於人類使用電子產品越來越普及，需要較大的資料傳輸量來應付越來越多的用戶。然而隨著製程和天線技術的演進，能將元件越做越小，對於天線來說，也就意味著能運作在更高的頻段，也就是說能在一個傳送端或用戶端上乘載多個的天線(Muti-Input Muti-Output, MIMO)來收發訊號。在目前5G的規劃，是以低頻段為主，高頻段為輔，其訊號格式仍然是利用正交分頻多工 (Orthogonal Frequency Diversity Mutiplexing , OFDM)，但是隨著天線數量的增加，就需要利用一些預編碼(Pre-Coding)技術來將混雜在一起的訊號分離。本篇論文實驗架構將仿效現行環境，傳送端為訊號產生器，其產生的訊號由電腦提供，傳送端到基地台是利用光纖來傳遞訊號，基地台再到用戶端則是利用天線來傳遞訊號，用戶端則是利用示波器將訊號存到電腦裡來做後續的數位訊號處理。利用空時編碼技術(Space Time Block Coding) 將傳送端的訊號先做編碼。在傳送端到基地台過程中，再利用偏振多工技術(Polarization Diversity Mutiplexing , PDM)來增加傳輸的資料量，在基地台到接收端，我們將訊號升頻到28GHz的毫米波頻段藉由天線進行傳輸，最後接收端再將訊號復原。
最後的實驗結果將比較只用一個天線和用多天線來傳輸的表現差別和優缺點，和在多天線的情況下，無線距離對於錯誤率的影響、光功率對於錯誤率，最後將比較兩種STBC排列的優缺點。

Because widespread of using electronic product, we need more data transmission rate to handle more user. Thanks to the evolution of produce process and antenna technology, size of elements are decreased. It means we can support many antennas on one user side and work at higher frequency. In present plans of 5G, we mainly use low frequency band to transmit signal and use high frequency band to support transmission. The format of signal is still Orthogonal Frequency Diversity Mutiplexing (OFDM). By the quantity of antenna increasing, we use pre-coding technology to separate signal from different antenna. The structure of this paper will imitate present communication system. At first, we use space time block code to pre-process signal, and then we use polarization diversity multiplexing for increasing data rate. However, we transmit signal through antennas at 28GHz (millimeter wave). Finally, we recover signal with digital signal processing at receiver. Final result will show our performance at different wireless distance and the sensitivity of optical power and comparison of SISO and MIMO. At last, we propose a simple structure to compare our original structure.

中文摘要 I
ABSTRACT II
致謝 III
目錄 IV
圖目錄 VII
表目錄 X
第一章 緒論 1
1-1 前言 1
1-2 研究動機與目的 3
1-3 論文架構 6
第二章 原理介紹 7
2-1 OFDM訊號原理 7
2-2 多對多天線傳輸MIMO 10
2-3 STBC編碼 11
2-3-1 STBC encoder 11
2-3-2 STBC decoder 13
2-3 光電轉換器―馬赫德調變器MACH-ZEHNDER MODULATOR(MZM) 16
2-4 光學梳狀濾波器OPTICAL INTERLEAVER 18
2-5 光接收器PHOTODETECTOR 19
2-6 混頻器MIXER 21
第3章 實驗架構介紹 22
3-1 DSP架構 22
3-2 偏振態多工(POLARIZATION DIVERSITY MULTIPLEXING ,PDM) 25
3-2-1 偏振態介紹 25
3-2-2 利用IL及特定訊號光波長實現偏振多工及偏振無感接收 26
3-3實驗架構 28
3-4 實驗參數設置 31
第4章 實驗結果 32
4-1 PDM光譜圖 32
4-2 單偏振和PDM的光功率VS BER比較圖 34
4-3 OPTICAL功率對BER 36
4-4 1X1 VS 2X1 VS 2X2對距離拉開的容忍表現 39
4-5 不同訊號格式星座圖 41
4-6 不同STBC排法表現比較 42
4-6-1 訊號排列格式介紹 42
4-6-2 結果圖 43
第5章 結論 44
參考文獻 45

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