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研究生:林俊宏
研究生(外文):Jyun-Hung Lin
論文名稱:適用於正交分頻多工系統之記憶性效應功率放大器適應性查表法預先失真補償技術
論文名稱(外文):Adaptive Look-Up Table Predistortion Technique for High Power Amplifier With Memory Effects In OFDM System
指導教授:連振凱連振凱引用關係
指導教授(外文):Jenn-Kaie Lain
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:電子與資訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:94
中文關鍵詞:預先失真補償技術正交分頻多工查表法
外文關鍵詞:predistortionOFDMHPA memory model
相關次數:
  • 被引用被引用:3
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  • 下載下載:61
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正交分頻多工(Orthogonal Frequency Division Multiplexing, OFDM)技術廣泛應用於各種無線通訊系統中,其具有高頻寬效率的優點,在多路徑通道環境中可以提供高可靠度的通訊傳輸。此技術最主要的缺點是具有高峰值對均值功率比,(Peak-to-Average Power Ratio, PAPR),導致高功率(High Power Amplifier, HPA)放大器之非線性失真,造成功率效益不佳,因此OFDM 系統對功率放大器的線性度要求較高。
在過去文獻中已有相當多的研究使用預先失真補償技術來解決無記憶性效應的高功率放大器(HPA)之非線性失真現象,不幸的是,這種無記憶性高功率放大器(HPA)之預先失真補償技術已經無法有效滿足寬頻及多頻的應用技術,像是OFDM(Orthogonal Frequency Division Multiplexing)系統和DVB-T(Digital Video Broadcasting-Terrestrial)...等等,所以記憶性效應的高功率放大器已經不能被忽略在使用寬頻或多頻的傳輸系統中。本論文研究適用於OFDM 系統之適應性數位預先失真技術採用記憶性效應的高功率放大器模型來模擬預先失真補償技術之效果。
Orthogonal Frequency Division Multiplexing (OFDM) has recently been applied widely in wireless communication systems. OFDM has high frequency efficiency and high communication transmission reliability under multi-path channel environment. A major drawback of OFDM is a high Peak-to-Average Power Ratio (PAPR) problem that causes the nonlinear distortion in High Power Amplifier (HPA) and reduces power efficiency, so higher linearity of power amplifier is needed.
In the past literature, there are many linearization techniques with predistorter to compensate the nonlinearity of memoryless effect of High Power Amplifier. Unfortunately, the performance with predistorter of memoryless effect High Power Amplifier has not satisfied the application with wider bandwidth and multi-bandwidth techniques, such as Orthogonal Frequency Division Multiplexing (OFDM) and Digital Video Broadcasting-Terrestrial (DVB-T) system..etc.. So that, memory effect High Power Amplifier would not be ignored when communication have wider bandwidth and multi-bandwidth. In this paper, memory effect High Power Amplifier model is taken with a adaptive predistorter in OFDM system and simulated out the performance after predistorter.
第一章 序論 1
1.1 研究動機 1
1.2 研究目的 2
第二章 研究背景 3
2.1 正交分頻多工系統發展演進 3
2.2 正交分頻多工介紹 6
2.2.1 OFDM技術簡介 6
2.2.2 OFDM技術原理 9
2.2.2.1 OFDM基本原理 9
2.2.2.2 OFDM正交原理 10
2.2.3 OFDM技術特性 11
2.2.3.1 OFDM抗多路徑干擾 11
2.2.3.2 OFDM的PAPR特性 12
2.3 功率放大器介紹 13
2.3.1 功率放大器簡介 13
2.3.2 功率放大器訊號 15
2.3.3 功率放大器模型 16
2.3.3.1 無記憶性效應高功率放大器模型 17
2.3.3.1.1 立方模型 17
2.3.3.1.2 Rapp model 18
2.3.3.1.3 Ghorbani 模型 19
2.3.3.1.4 Saleh 20
2.3.3.2 記憶性效應高功率放大器模型 22
2.3.3.2.1 記憶性多項式之高功率放大器模型 22
2.3.3.2.2 Model of TWTA with memory 23
2.3.4 功率放大器非線性失真效應 25
2.3.4.1 無記憶性非線性效應 25
2.3.4.2 記憶性非線性效應 27
2.3.4.3 互調失真 27
2.3.4.4 振幅失真 29
2.3.4.5 相位移失真 30
2.3.4.6 頻率失真 30
2.3.4.7 AM/AM、AM/PM 失真 30
2.4 功率放大器非線性失真對OFDM 之影響 31
2.4.1 功率放大器非線性傳輸特性 31
2.4.2 改善OFDM訊號傳輸非線性效應 34
2.4.2.1 降低OFDM 訊號的PAPR 特性. 34
2.4.2.2 改善發射端的非線性傳輸特性 37
第三章 功率放大器線性化技術 39
3.1 功率放大器線性化技術簡介 39
3.1.1 回授式線性化技術 40
3.1.2 前饋式線性化技術 42
3.1.3 反減補償技術 43
3.1.3.1 反減補償技術簡介 43
3.1.3.2 P1dB功率壓縮點 44
3.1.4 預先失真線性化技術 45
3.2 基頻數位預先失真線性化技術 48
3.2.1 多項式基頻數位預先失真補償器 49
3.2.2 查表式基頻數位預先失真補償器 51
3.2.2.1 查表式基頻無記憶性數位預先失真補償器 51
3.2.2.2 查表式基頻記憶性數位預先失真補償器 54
3.2.3 多項式結合查表式基頻數位預先失真器 59
3.2.4 最小均方演算法(LMS) 61
3.3 查表法結合內插法線性化技術 62
3.3.1 查表法結合線性內插法基頻預先失真器 63
3.4 查表法結合線性內插法之預先失真補償器硬體實現 66
第四章 模擬結果 69
4.1 模擬設定 69
4.2 峰值裁減 70
4.3 模擬結果 71
4.3.1 無記憶性效應預先失真補償技術模擬結果 72
4.3.1.1 多項式法模擬結果 72
4.3.1.2 查表法模擬結果 74
4.3.1.3 多項式法結合查表法模擬結果 77
4.3.1.4 查表法結合線性內插法模擬結果 79
4.3.2 記憶性效應預先失真補償技術模擬結果 83
4.3.2.1 模擬系統 A 84
4.3.2.2 模擬系統 B 86
第五章 結論 90
參考文獻 91
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