跳到主要內容

臺灣博碩士論文加值系統

(54.83.119.159) 您好!臺灣時間:2022/01/17 09:51
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

我願授權國圖
: 
twitterline
研究生:侯信安
研究生(外文):Xin-Anne Hou
論文名稱:應用於正交分頻多工系統中一種有效降低峰值對平均功率比方法
論文名稱(外文):An Efficient Peak-to-Average Power Ratio (PAPR) Reduction Method in OFDM
指導教授:魏哲和魏哲和引用關係
指導教授(外文):Che-Ho Wei
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電子工程系
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:2002
畢業學年度:90
語文別:英文
中文關鍵詞:高峰值對平均功率比正交分頻多工系統
外文關鍵詞:PAPROFDM
相關次數:
  • 被引用被引用:0
  • 點閱點閱:192
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
OFDM是一種可以滿足高速資料傳輸需求的多工技術,但OFDM有兩項主要的缺點:高峰值對平均功率比(PAPR)以及對頻率飄移敏感。高峰值對平均功率比會同時降低功率放大器的效率,並且使系統的效能惡化。結果高峰值對平均功率比使得OFDM實作上變得困難。
這篇論文整理現行許多降低PAPR方法,並針對這些方法進行電腦模擬,而其結果作為比較的依據。首先,解決PAPR問題的基本演算法,包括:訊號變形、編碼,和多信號表示方式,將會在此論文中描述。更進一步,對基本演算法的修正也包含在此篇論文。最後,根據模擬所得到的結果,我們想出一種在OFDM系統中有效降低PAPR的方法。

Orthogonal Frequency Division Multiplexing (OFDM) is a promising transmission technique which satisfy the requirement of high data rate communication. However, OFDM has two main disadvantages: high PAPR and sensitivity to frequency offset. High PAPR reduces the power amplifier efficiency and degrades the performance of the system. Consequently, high PAPR makes implementation of OFDM difficult.
This thesis reviews several PAPR reduction methods and provides computer simulations to evaluate these methods. The basic algorithms of PAPR reduction methods, including signal distortion, coding, and multiple signal representation, are described in this thesis. Furthermore, the modified algorithms are also investigated. Finally, we propose an efficient PAPR reduction method, attenuation, in OFDM based on the simulation result.

LIST OF CONTENTS I
LIST OF FIGURES IV
LIST OF TABLES VII
CHAPTER 1 INTRODUCTION 1
CHAPTER 2 OFDM TECHNIQUE 1
2.1. HISTORY OF OFDM TECHNIQUE 2
2.2. OFDM BASICS 3
2.3. CYCLIC PREFIXED GUARD TIME 6
2.4. TRANSMISSION OVER BAND-LIMITED CHANNELS 9
2.5. OFDM PARAMETERS 13
CHAPTER 3 PAPR PROBLEM IN OFDM 15
3.1. PEAK-TO-AVERAGE POWER RATIO IN OFDM SYSTEM 16
3.2. PAPR DISTRIBUTION IN OFDM SIGNALS 19
3.2.1. Maximum PAPR 19
3.2.2. PAPR distribution 20
3.3. NON-LINEAR EFFECT OF FRONT-END COMPONENTS 25
3.3.1. Characteristic of the power amplifier 25
3.3.2. Reasonable PAPR range considering DAC precision 26
CHAPTER 4 BASIC ALGORITHM FOR PAPR REDUCTION METHODS 28
4.1. SIGNAL DISTORTION METHOD 29
4.1.1. Clipping 29
4.1.2. Companding 31
4.1.3. Attenuation 35
4.2. SCRAMBLING AND CODING 38
4.2.1. Scrambling 38
4.2.2. Coding 38
4.3. MULTIPLE SIGNAL REPRESENTATION (MSR) 47
4.3.1. Selected mapping 47
4.3.2. Partial Transmit Sequence 48
4.3.3. Random Interleaving [27] 50
4.4. SUMMARY 51
CHAPTER 5 MODIFIED ALGORITHM AND SIMULATION FOR PAPR REDUCTION METHODS 52
5.1. SIGNAL DISTORTION 54
5.1.1. Repeated clipping and frequency domain filtering 54
5.1.2. New attenuation structure 54
5.1.3. Improve attenuation by combining with PTS 56
5.1.4. Simulation results 57
5.2. CODING 67
5.2.1. GRM codes construction of high-order QAM constellation 67
5.2.2. Simulation results 68
5.3. MULTIPLE SIGNAL REPRESENTATION 70
5.3.1. Modified algorithm 70
5.3.2. Simulation result 75
5.4. SUMMARY 77
CHAPTER 6 CONCLUSION 81
REFERENCES 83

[1] I. C. Chung, “Peak-to-average power ratio reduction techniques for OFDM signals”, NCTU master thesis, Institute of Electronics College of Electrical and Computer Science National Chuao Tung University, Jun. 2001.
[2] R. van Nee, R. Prasad, “OFDM for wireless multimedia communications”, Artech House, 2000.
[3] H. Ochiai, H. Imai, “On the distribution of the Peak-to-Average power ratio in OFDM signals”, IEEE Trans. on Comm., vol. 49, no. 2, pp. 282-289, Feb. 2001.
[4] J. Armstrong, “Peak-to-average power reduction for OFDM by repeated clipping and frequency domain filtering”, IEEE Electronics Letters, vol. 38, no. 5, pp. 246-247, Feb 2002.
[5] X. Huang, J. Lu, J. Zheng, “Companding transform for the reduction of peak-to-average power ratio of OFDM signals”, in Proc. VTC ’01, vol. 2, pp. 835-839, 2001.
[6] J. A. Davis, J. Jedwab, “Peak-to-mean power control in OFDM, Golay complementary sequence, and Reed-Muller codes”, IEEE Trans. Info., vol. 45, no. 7, pp. 2397-2417, Nov. 1999.
[7] C. Rößing, V. Tarokh, “A contruction of OFDM 16-QAM sequence having low peak powers”, IEEE Trans. Info., vol. 47, no. 5, pp. 2091-2094, July 2001.

QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top