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研究生:陳培宗
研究生(外文):Pei-Chung Chen
論文名稱:正交分頻多工系統之前導碼排列方式研究
論文名稱(外文):STUDIES OF PILOT PATTERN FOR OFDM SYSTEMS
指導教授:許超雲許超雲引用關係
指導教授(外文):Chau-Yun Hsu
學位類別:碩士
校院名稱:大同大學
系所名稱:通訊工程研究所
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:2007
畢業學年度:95
語文別:英文
論文頁數:49
中文關鍵詞:OFDMpilotchannel estimation
外文關鍵詞:正交分頻多工前導碼通道估測
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現代數位通訊對高效率傳輸要求越來越提高,所以尋找提高傳輸效率的方法一直是大家追求
的重點. 而本篇論文主要在透過電腦模擬驗證,在相同的前導碼密度(pilot density)條件
下, 使用不同的前導碼排列方式(pilot pattern)可以提高系統傳輸效率及透過電腦模擬證
明鑽石形排列方式具有最高的傳輸效率.
The modern digital communications are more and more enhances to high
efficiency transmission request, therefore to find a way to enhances data
transmission efficiency is popular subject. A communications signal
transmission over wireless channels, that in practice has suffers much
interference and noise influence. Especially, the practice channel is time
variance, which have different channel characteristic at different time. This
thesis mainly to proof that we can enhance the transmission efficiency by
change pilot pattern alignment at same pilot density condition, and to verify
the pilot pattern arrangement in diamond shape have highest transmission
efficiency then any other, by simulation manner.
ENGLISH ABSTRACT i
CHINESE ABSTRACT ii
ACKNOWLEDGEMENTS iii
TABLE OF CONTENTS iv
LIST OF FIGURES vi
LIST OF TABLES x

I Introduction 1
1.1 Background 1
1.2 Motivation 2
1.3 Organization of This Thesis 2
II Overview of OFDM System 3
2.1 Introduction of OFDM Communication System 3
2.1.1 OFDM Architecture 3
2.1.2 OFDM Signals 4
2.1.3 Bandwidth Efficiency 5
2.2 OFDM Modulation 7
2.3 Guard Interval and Cyclic Prefix 8
2.4 Pilot placement 10
III Mobile Wireless Channel 12
3.1 AWGN Channel Model 12
3.2 Mobile Radio Propagation 14
3.2.1 Multipath fading Channels 16
3.2.2 Rayleigh fading 16
3.2.3 Rician fading 19
3.2.4 Doppler shift 20
3.2.5 Jakes’ model simulation 22
IV Pilot-Assisted OFDM Channel Estimation 26
4.1 Channel modeling 26
4.2 Two-Dimensional Channel Estimation 28
4.2.1 2 D-pilot placement 28
4.2.2 Maximum pilot distance 32
4.2.3 Optimal pilot pattern 34
V Simulation Result 37
5.1 Estimator simulation model 37
5.2 Simulation Result 41
VI Conclusions 45
REFERENCES 46
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[6] John G . Proakis, Digital Communications, McGraw-Hill, 2000.
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[8] Theodore S. Rappaport, Wireless Communications Principles and Practice,
Second Edition, Prentice Hall, 2002
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Systems Technical Journal, vol.47, pp.957-1000, 1968.
[10] William C. Jakes, Microwave Mobile Communications, John Wiley & Sons,
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Electron Letter, vol.29, no.13, pp.1162-1163, June, 1993.
[16] Baoguo Yang, Khaled Ben Letaief, Roger S. Cheng, and Zhigang Cao,
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Channels Based on Parametric Channel Modeling,” IEEE Trans. Comm, vol.
49, no. 3, pp. 467-479, March, 2001.
[17] Michele Morelli and Umberto Mengali, “A Comparison of Pilot-Aided
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