博碩士論文 104553024 詳細資訊




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姓名 古世丞(Shih Cheng Ku)  查詢紙本館藏   畢業系所 通訊工程學系在職專班
論文名稱 基於查表方式做不同內插法之適應性放大器預失真
(LUT Based Adaptive Predistortion for PA with Different Interpolation Methods)
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摘要(中) 在過去,資料傳輸的速率及訊號品質皆遠不及現今處處普及之4G 與5G 的高速無線傳輸,原因之一為今日的無線通訊系統架構中,採用數位預失真做為資料傳送端之訊號補償技術,儘管資料傳輸過程中的接收端和傳送端皆須有良好的訊號品質,但無線通訊系統中傳送端的基本訊號品質對傳輸速率之影響更鉅。近幾年來,已有多項關於數位預失真技術之研究,例如:多項式基頻數位預失真及查表式基頻數位預失真…等。在本研究中,將以查表式數位預失真技術為主,比較數種不同數位預失真架構及其差異,並且採用如LMS(Least Mean Square)、Interpolation、及Adaptive system…等相關的演算法,以獲得不同參數設定所呈現的模擬結果,進而探討在功率放大器加入PA Identification(功率放大器識別器)的技術,比較其相對應的成效及不同架構應用之優劣性,主要研究目的為使數位預失真的收斂速度可以有效的提高,且使功率放大器的輸出能夠更接近由系統傳送給功率放大器的原始輸入訊號,藉此研究結果優化整體數位預失真的收斂時間與功率放大器輸出的訊號品質。
摘要(英) The data transmission rate and signal quality have been significantly improved in wireless transmission such as 4G and 5G nowadays. One of the reasons leading to better results is to adopt digital predistortion as the compensation technology for power amplifiers (PA) in the present wireless communication systems. Although during the process of data transmission, the receiver and the transmitter both have to be equipped with good signal quality, the signal quality of the transmitter in a wireless communication system has important influence on data transmission rate. In the recent years, there have been many studies on digital presdistortion technology such as polynomial baseband digital predistortion and
look-up-table digital predistortion and so on. In this study, look-up-table digital predistortion is considered with comparing several kinds of digital interpolation methods. In addition, some algorithms such as Least Mean
Square (LMS), interpolation, and the adaptive PA identification structure were applied in order to compare simulation results due to different parameter settings. This study also involves the technique of applying PA
identification for the PA. The main purpose of this study is to upgrade the convergence of digital predistortion more efficiently and to enable the output of the PA to be approach the original input signals.
關鍵字(中) ★ 預失真
★ 查表法
★ 內插法
★ 適應性
★ 功率放大器
關鍵字(英) ★ Pre-Distortion
★ Look-Up-Table
★ Interpolation
★ Adaptive
★ Power Amplifier
論文目次 中文摘要. . . . . . . . . . . . . . . . . . . . . . i
英文摘要 . . . . . . . . . . . . . . . . . . . . . iii
目錄. . . . . . . . . . . . . . . . . . . . . . . . i
圖目錄. . . . . . . . . . . . . . . . . . . . . . . ii
表目錄. . . . . . . . . . . . . . . . . . . . . . . iv
第1 章序論. . . . . . . . . . . . . . . . . . . . . 1
1.1 前言. . . . . . . . . . . . . . . . . . . . . . 1
1.2 章節架構 . . . . . . . . . . . . . . . . . . . . 3
第2 章數位預失真的基本架構. . . . . . . . . . . . . . 5
2.1 功率放大器之非線性特性. . . . . . . . . . . . . . 6
2.1.1 功率放大器之飽和特性. . . . . . . . . . . . . . 6
2.1.2 AM/AM 與AM/PM 特性 . . . . . . . . . . . . . . 7
2.2 功率放大器之預失真補償 . . . . . . . . . . . . . . 9
2.3 運用PA 逆函式導出Inverse LUT . . . . . . . . . . 10
2.4 基本自適應預失真架構建置. . . . . . . . . . . . . 15
第3 章學習PA 特性並找出初始查找表之方法. . . . . . . . 22
3.1 PA Model Identification 的架構. . . . . . . . . 23
3.2 運用直接學習架構方法建立初始LUT . . . . . . . . . 26
3.3 內插法的運用 . . . . . . . . . . . . . . . . . . 27
3.3.1 Linear Interpolation. . . . . . . . . . . . . 27
3.3.2 Previous Interpolation. . . . . . . . . . . . 29
3.3.3 Next Interpolation. . . . . . . . . . . . . . 30
3.3.4 Spline Interpolation. . . . . . . . . . . . . 31
3.3.5 Pchip Interpolation . . . . . . . . . . . . . 34
第4 章系統模擬與結果分析. . . . . . . . . . . . . . . 36
4.1 無功率放大器識別器的初始查找表模擬 . . . . . . . . 38
4.1.1 模擬結果比較- 無PA Identification . . . . . . . 39
4.1.2 模擬加入內插法的結果比較- 無PA Identification . .43
4.2 功率放大器識別器置入初始查找表模擬. . . . . . . . .44
4.2.1 模擬結果比較- 有PA Identification . . . . . . .46
4.2.2 模擬加入內插法的結果比較- 有PA Identification . .49
4.3 比較不同查找表大小之影響. . . . . . . . . . . . . .50
第5 章結論. . . . . . . . . . . . . . . . . . . . . .58
參考文獻. . . . . . . . . . . . . . . . . . . . . . . 59
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指導教授 張大中(Dah-Chung Chang) 審核日期 2019-7-1
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