在智能算法下減少相似度並應用於降 低正交分頻多工系統的峰均功率比

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蘇筱晴(Xiao-Qing Su) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

在智能算法下減少相似度並應用於降低正交分頻多工系統的峰均功率比
(Similarity-Reduced Intelligent Algorithms for OFDM PAPR Reduction)

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摘要(中)

在通訊領域當中，正交分頻多工系統 (Orthogonal Fre-
quency Division Multiplexing, OFDM) 一直被廣為使用。然而，
OFDM 系統卻有很嚴重的高峰均功率比 (Peak-to Average Power
Ration, PAPR) 的問題，因此如何改善 PAPR 是一個很重要的課題。
如今已有許多技術被開發於改善 PAPR 的問題，其中部分傳輸序
列 (Partial Transmit Sequences, PTS) 也是常被使用的技術之一，由
於 PTS 採用遍佈式搜索最佳角度相位，所以計算複雜度相當高。
利用智慧型演算法 (Intelligent Algorithm, IA) 結合 PTS 是我們近年
來常使用的次佳化演算法，可以有效的降低 PAPR，並且大幅降低
計算複雜度，因此，這類型的次佳化演算法也是一個常被拿來研
究的議題。
因為智慧型演算法結合 PTS 與傳統 PTS 效能還是有些差距，本
論文根據常用的智慧型演算法做些修改，加入檢視相似度過高的
i相位因子並加以修正，可以避免會陷入區域最佳解或提早收斂的
情況，雖然會增加一些複雜度，但卻比傳統的方法更有效率的降
低訊號的 PAPR 值。

摘要(英)

Orthogonal Frequency Division Multiplexing (OFDM) has been
widely used in communication fields. One of the major drawbacks of
OFDM is high peak-to-average power ratio (PAPR) for the transmitted
signals. Therefore, the issue about how to remedy the PAPR in an OFDM
system is important. Nowadays, many techniques have been developed
to reduce the problem of high PAPR. Partial Transmit Sequence (PTS)
is one of the attractive techniques to reduce the PAPR, but PTS requires
an exhaustive search for all combinations of allowed phase factors such
that the computational complexity is quite high. The sub-optimal algo-
rithms that combine the PTS technique and intelligent algorithms have
been frequently discussed in the past few years. It can effectively reduce
PAPR and significantly decrease computational complexity. As a result,
iiithis type of sub-optimal algorithms become a subject that draws a lot of
interest.
However, there is still some performance gap between the sub-optimal
algorithms and the traditional PTS solutions. In this thesis, we propose a
new method based on the intelligent algorithms which reduces the sim-
ilarity during searching for the phase factors for PTS in order to avoid
the solutions falling in local minimum. The proposed method can ef-
fectively reduce PAPR though it may increase computational complexity
more than the original intelligent algorithms.

關鍵字(中)

★ 部分傳輸序列
★ 智慧型演算法
★ 人造蜂群演算法
★ 免疫基因演算法
★ 相似度

關鍵字(英)

★ PTS
★ Intelligent Algorithm
★ Aartificial Bee Colony Algorithm
★ Immune Genetic Algorithm
★ Similarity

論文目次

中文摘要 i
Abstract . iii
Contents . i
List of Figures ii
Table of Figures . iii
Chapter1Introduction . 1
Chapter2OFDM and Partial Transmit Sequence 7
2.1 OFDM and PAPR 7
2.2 The PTS scheme . 9
Chapter3PAPR Minimization using modified IGA and modified ABC 12
3.1 Metric for Similarity 12
3.2 The MIGA Algorithm . 15
3.3 The MABC Algorithm 23
3.3.1 Complexity Analysis 28
Chapter4Simulation Result 33
4.1 Performance of Proposed Method with Different Threshold . 34
4.2 Comparison of Proposed Method with previous Algorithm 50
Chapter5Conclusion 58
Reference 59

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指導教授

張大中(Dah-Chung Chang)

審核日期

2016-1-28

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