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研究生： 吳昱賢
Yu-Hsien Wu
論文名稱： 預編碼技術應用於多使用者多輸入多輸出下行系統之研究
Precoding for Multiuser MIMO Downlink Systems
指導教授： 張立中
Li-Chung Chang
口試委員: 曾德峰
Der-Feng Tseng
劉馨勤
Hsin-Chin Liu
曾恕銘
Shu-Ming Tseng
學位類別： 碩士
Master
系所名稱： 電資學院 - 電機工程系
Department of Electrical Engineering
論文出版年： 2015
畢業學年度： 103
語文別： 中文
論文頁數： 65
中文關鍵詞： 多使用者多輸入多輸出 、多使用者干擾 、預編碼 、位元錯誤率 、複雜度
外文關鍵詞： Multiuser MIMO, MUI, precoding, BER, Complexity
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    • 多使用者多輸入多輸出(multiuser multi-input multi-output, MU-MIMO)系統是設計給多個使用者同時使用的MIMO系統的架構，它在無線網路的環境裡可以增加傳輸的效率，然而在傳訊號的時候卻會產生多使用者干擾(multi-user interference, MUI)使得每一個使用者無法收到正確的資料。預編碼(precoding)是MU-MIMO系統裡很重要的技術，其功用是就是消除多使用者干擾(multi-user interference, MUI)，所以預編碼的設計就會影響到整個系統的效能。本論文一開始會介紹MU-MIMO下行系統、MU-MIMO正交分頻多工(multiuser multi-input multi-output orthogonal frequency division multiplexing, MU-MIMO OFDM)下行系統以及近年來的幾個用於兩系統的預編碼方法，接下來會基於這些預編碼方法提出一個複雜度比較低的預編碼方法。新的預編碼方法會與舊有的預編碼方法進行效能比較，效能比較的指標為位元錯誤率(bits error rate, BER)和複雜度(complexity)。BER的效能比較會在MU-MIMO和MU-MIMO OFDM系統上模擬，每一個系統都會用兩個不同的通道來比較效能。複雜度則是會改變使用者的個數或天線個數的情況下來模擬比較各個預編碼的計算量。

    Multiuser multi-input multi-output (MU-MIMO) downlink systems are designed for many users using MIMO systems in the same time; it can improve efficiency of transmission in the wireless network. However, MU-MIMO systems will cause multi-user interference (MUI) to the users which cannot receive signal correctly. Precoding techniques are the important process for MU-MIMO systems. The main purpose of precoding is to eliminate MUI, so the design of precoding will affect the performance of systems. In this thesis, we will introduce MU-MIMO downlink systems、MU-MIMO orthogonal frequency division multiplexing (MU-MIMO OFDM) downlink systems and precoding methods in the recent years for them. Based on these precoding techniques, we propose a novel precoding method with less complexity. New method will compared with old methods in bits error rate (BER) and complexity. BER comparison will simulate in MU-MIMO and MU-MIMO OFDM systems, each of them is simulated with two different channels. Complexity simulation will have two scenarios; first one is changing the number of users and the other one is changing the number of antennas.

    第一章序論 1.1 研究背景 1.2 論文架構 1.3 符號介紹 第二章系統架構與相關技術介紹 2.1 系統架構 2.1.1 多使用者多輸入多輸出系統(MU-MIMO system) 2.1.2 多使用者多輸入多輸出正交分頻多工系統(MU-MIMO-OFDM system) 2.2 相關技術介紹 2.2.1 正交分頻多工(OFDM) 2.2.2 保護區間(guard interval) 2.2.3 奇異值分解(SVD) 2.2.4 QR分解(QRD) 2.2.5 條件數(Condition Number) 2.2.6 晶格縮減(Lattice Reduction, LR) 2.2.6.1 晶格(Lattice) 2.2.6.2 複數LLL(Complex LLL, CLLL)縮減演算法 2.2.7 預編碼(Precoding) 2.2.7.1 通道反矩陣法(Channel Inversion, CI) 2.2.7.2 簡化廣義MMSE反矩陣法(Simplified Generalized MMSE Channel Inversion, S-GMI) 2.2.7.3 晶格縮減S-GMI-MMSE法(Lattice Reduction S-GMI-MMSE, LR-S-GMI-MMSE) 2.2.7.4 低複雜度GMI法(Low Complexity GMI,LC-GMI) 第三章新的預編碼方式、複雜度與模擬環境 3.1 本論文提出的預編碼方法(Proposed) 3.2 Proposed的效能分析 3.3 複雜度(Complexity) 3.4 模擬環境 第四章模擬結果 4.1 BER效能模擬結果 4.1.1 MU-MIMO系統在Channel Model 1的模擬結果 4.1.2 MU-MIMO系統在Channel Model 2的模擬結果 4.1.3 MU-MIMO OFDM系統在Channel Model 3的模擬結果 4.1.4 MU-MIMO OFDM系統在Channel Model 4的模擬結果 4.1.5 增加傳送端天線個數對BER效能的影響 4.2 複雜度模擬結果 4.2.1 固定使用者接收端天線個數的預編碼複雜度模擬結果 4.2.2 固定使用者個數的預編碼複雜度模擬結果 4.3 綜合結果 第五章結論 附錄A 附錄B 參考文獻

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