直接序列展頻系統利用平行干擾消除與編碼技術在M-ary正交調變下之干擾分析與模擬

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姓名

周煌奇(Huang-Chi Zhou ) 查詢紙本館藏

畢業系所

電機工程研究所

論文名稱

直接序列展頻系統利用平行干擾消除與編碼技術在M-ary正交調變下之干擾分析與模擬
(Performance Analysis and Simulation Using Parallel Interference Cancellation and Coding Technique in DS-CDMA system with M-ary Orthogonal Modulation)

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摘要(中)

第三代行動通訊系統是架構在CDMA系統架構下的，這是因為CDMA的系統能夠提供了比TDMA與FDMA系統更多的系統容量。但是在CDMA系統中，當所使用的Pseudo-Noise sequences並不正交時，訊號會受到所謂的Multiple Access Interference(MAI)的干擾。
本篇論文因此分析使用M-ary 正交調變的DS-CDMA系統效能，並且使用四種的PIC的接收技術去消除MAI的干擾影響，此外還利用三種的編碼方式增加系統效能，以及使用RAKE接收架構與Channel Estimation抵抗多路徑通道的衰落的效應。
論文中的模擬結果顯示，使用了以上所述的技術後，可以得到較好的效能結果。

摘要(英)

The 3th generation mobile communication system will base on CDMA system, because CDMA system can provide more capacity than TDMA and FDMA systems. But because the pseudo-noise sequences are not exatly orthogonal, signal will suffer from the interference called Multiple Access Interference (MAI).
This thesis analyzes the performance of DS-CDMA system with M-ary orthogonal Modulation, using four types of PIC receiver to cancel the MAI effect, tow kinds of channel codes to increasing the system performance. RAKE structure and Channel Estimation are also used to fight multipath fading.
The simulation results show that we have can improve the performance using PIC, Coding, and channel estimation technique.

關鍵字(中)

★ M-ary正交調變
★ 平行干擾消除
★ 編碼

關鍵字(英)

★ CDMA
★ Coding
★ M-ary Orthogonal Modulation
★ PIC

論文目次

Contents
ABSTRACT...............................................I
CONTENTS...............................................II
List of Figures and Tables.............................IV
Chapter 1 Introduction................................1
1.1 Research Background..............................1
1.2 Research Motivation..............................2
1.3 Thesis Architecture..............................4
Chapter 2 DS-CDMA System and Channel Model............5
2.1 Transmitter Model................................5
2.1.1M-ary Orthogonal Modulation Transmitter Model
..............................................6
2.2 Pseudo-Noise Spreading Sequence Generator.....8
2.2.1Maximal Length Sequences......................9
2.3 Channel Model.................................14
2.3.1Multi-path Fading Model.......................14
2.4 Rake Receiver Model...........................16
2.4.1Non-coherent Rake Receiver....................16
2.5 Channel Estimation Technique..................19
2.5.1Ideal on estimation of non-coherent reception
..............................................20
2.5.2Estimator on Channel parameter................21
Chapter 3 Coding......................................25
3.1 Convolutional Coding.......................25
3.1.1 Convolutional Encoder.................25
3.1.2 Convolutional Decoder.................30
3.2 Turbo Coding............................31
3.2.1 Turbo Coding structure.........................31
3.2.2 Puncturing............................32
3.2.3 Decoder...............................33
Chapter 4 Multiple Access Interference Cancellation
Scheme And Performance Analysis.............34
4.1 Conventional DS-CDMA System Without Multiuser
Interference Cancellation........................35
4.1.1 Receiver Performance Analysis..................36
4.1.2 BER Performance under AWGN Channel.............42
4.1.3 BER Performance under Fading Channel...........43
4.2 Conventional Parallel Interference Cancellation
.................................................44
4.2.1 Multistage Parallel Interference Canceller Analysis
...............................................48
4.3 Multistage Partial Parallel Interference Cancellation
.................................................51
4.4 Adaptive Parallel Interference Cancellation......54
4.5 Wiener Filter Multistage Parallel Interference
Cancellation.....................................60
Chapter 5 Simulation Results and Discussion...........64
5.1 PIC Schemes Under AWGN Channel...................65
5.1.1 Performance Using PIC Schemes Under AWGN Channel
.............................................65
5.1.2 Performance Using PIC Schemes With Coding Under
AWGN Channel.................................67
5.2 Performance Using RAKE Receiver and Channel Estimation
Under Multipath Fading...........................68
5.3 PIC Schemes Under Two Path Rayleigh Fading Channel
.................................................69
5.3.1 Performance Using PIC Schemes Under Two Path Rayleigh
Fading Channel..............................69
5.3.2 Performance Using PIC Schemes With Coding Under
Two Path Rayleigh Fading Channel.............70
5.4 Simulation Results...............................71
Chapter 6 Conclusions.................................82
APPENDIX
A.I Correlator Output Process.................84
A.II BER for Wiener filter...................86
Reference

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指導教授

蔡木金(Mu-King Tsay)

審核日期

2001-6-8

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