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姓名 沈律名(Lu-Min Shen)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 混沌粒子群優化演算法用於預失真線性化技術
(Linearization for Predistortion Using the Chaotic Particle Swarm Optimization Method)
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摘要(中) 正交分頻多工(Orthogonal Frequency Division Multiplexing,OFDM)因為高效率的頻寬效益以及多路徑通道的穩定傳輸,使得其成為現代無線通訊中不可或缺的技術。然而,此技術本身所擁有的高峰值對均值功率比(Peak-to-Average Power Ratio,PAPR)問題,造成功率放大器之非線性失真,導致調變訊號會有頻譜再生(Spectral Regrowth)的現象而干擾鄰近通道的傳輸訊號。考慮到寬頻系統中的記憶性問題,本篇論文研究了功率放大器的新預失真技術。在過去的文獻中,已有許多預失真器模型能夠同時對功率放大器進行記憶非線性化的補償。在本論文的架構中,首先將功率放大器模型的表示成一個具有記憶性的沙雷(Saleh)的模型,預失真器的部分,則是利用記憶性多項式做為預失真器的模型。與過去的預失真方法比較,提出的預失真器能透過改善混沌粒子群演算法於間接學習結構中對所提出的預失真器參數做迭代的估測,實現理想的系統性能以及加快收斂的速度,就能達成高度的線性化補償。
摘要(英) It is well known that Orthogonal Frequency Division Multiplexing (OFDM) has become indispensable in modern wireless communications because of high frequency efficiency and high transmission stability in multi-path channel environments. However, OFDM has an inherent characteristic of high Peak-to-Average Power Ratio(PAPR) subject to nonlinear distortion of a power amplifier, leading to the phenomenon of spectral regrowth for modulated signals such that the adjacent communication channels are interfered. Taking into account the memory problem in wideband systems, this thesis studied a new predistortion scheme for the power amplifier. From previous researches in the literature, there have been many predistorter’s models considering to compensate for the nonlinearity effect of a power amplifier. In our framework, we first establish the Saleh model for characterizing the power amplifier followed by a LTI model and then use the Memory polynomial model for the predistorter. Compared with previous predistortion methods, the proposed predistorter is easier to reach the required performance with a with a new chaotic particle swarm optimization(NCPSO) method at a satisfying convergence rate.
關鍵字(中) ★ 預失真
★ 粒子群演算法
★ 功率放大器
關鍵字(英) ★ predistortion
★ particle swarm optimization
★ power amplifier
論文目次 中文摘要.i
英文摘要.ii
目錄 . i
圖目錄. ii
表目錄.iii
第 1 章序論 . 1
1.1 前言 .1
1.2 章節架構 .4
第 2 章系統模型 . 5
2.1 傳輸訊號模型 .5
2.2 功率放大器模型 .6
2.2.1 記憶型 PA-Weiner Model .7
2.2.2 記憶型 PA-Hammerstein Model .8
2.2.3 非記憶型 PA-Saleh Model .8
2.4 預失真器學習結構 . 10
第 3 章補償非線性的預失真技術演算法 .12
3.1 間接學習架構自適應性算法的預失真器參數估計 .13
3.1.1 NLMS .13
3.1.2 RLS .14
3.1.3 Wiener . 15
3.1.4 KF . 16
3.1.5 UKF . 18
3.2 直接學習架構自適應性算法的預失真器參數估計 .22
3.2.2 RLS . 23
3.2.3 UKF .24
3.3 基於 PSO 算法的預失真器參數估計 .27
3.3.1 改善混沌粒子群演算法 (NCPSO) . 29
第 4 章系統模擬與結果分析 .33
4.1 間接學習架構下不同演算法比較 .34
4.1.1 星座點比較 .34
4.1.2 誤差向量幅度 .37
4.1.3 演算法收斂曲線比較 .39
4.1.4 ACPR 指標 .42
4.1.5 功率頻譜密度 .44
4.2 直接學習架構下不同演算法比較 .44
4.2.1 星座點比較 .44
4.2.2 誤差向量幅度 .46
4.2.3 演算法收斂曲線比較 . 47
4.2.4 ACPR 指標 .48
4.2.5 功率頻譜密度 .50
4.3 NCPSO 參數變化影響之比較 .51
4.4 複雜度比較 . 55
第 5 章結論 . 62
參考文獻.63
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指導教授 張大中(Da-Chung Chang) 審核日期 2018-8-16
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