直接序列展頻系統利用干擾消除在多速率傳輸下的分析與模擬

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姓名

劉柏賢(Po-Hsieh Liu) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

直接序列展頻系統利用干擾消除在多速率傳輸下的分析與模擬
(Simulation and Performance Analysis of Interference Cancellation For Multi-rate MPG DS-CDMA system)

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摘要(中)

在第三代行動通訊發展中，著重在現實行動系統中能夠結合高、中和低速率傳輸。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。
在本篇論文中我們分析與模擬不同的干擾消除機制(IC)去消除MAI的干擾影響，在探討這些干擾消除機制時，將可瞭解平行干擾消除機制(PIC)、團體方式平行干擾消除機制(GPIC)與團體方式串聯干擾消除機制(GSIC)的優缺點。同時我們也考慮了兩種團體方式混合干擾消除機制(GHIC)，因為它能夠改善GPIC與GSIC的缺點。
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)

In the development of third mobile telecommunication systems, attention for the realization of mobile systems, which are able to integrate high, medium and low rate transmission is increasing day by day. But because that the pseudo-noise sequences are not exactly orthogonal, signal will suffer from the interference called Multiple Access Interference (MAI).
In this thesis, we analyze and simulate different kinds of interference cancellation (IC) schemes to overcome MAI in multi-rate MPG DS/CDMA. Among ICs, we can see the advantage and disadvantage of traditional parallel interference cancellation (PIC) 、 groupwise parallel interference cancellation (GPIC) and groupwise serial interference cancellation (GSIC). Two kinds of groupwise hybrid interference cancellation (GHIC) by combining GSIC and GPIC is also considered. It can improve the disadvantage of PIC 、GPIC and GSIC.
The simulation results show that the performance enhancement can be achieved through weighting factors and Improved IC technique.

關鍵字(中)

★ 多人使用干擾
★ 干擾消除機制

關鍵字(英)

★ multiple access interference
★ cdma
★ interference cancellation scheme

論文目次

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 Multirate DS-CDMA System and Channel Model 5
2.1 System Model 5
2.1.1 Amplitude Modulated DS-CDMA Systems 5
2.1.2 Quadrature Amplitude Modulated DS-CDMA Systems 7
2.2 Pseudo-Noise Spreading Sequence Generator 8
2.2.1 Pseudo-random Noise Sequence 8
2.2.2 Maximal Length Sequences 9
2.3 Multi Processing-Gain Systems Performance in AWGN Channels 11
2.4 Performance in Multipath Rayleigh Fading Channel 12
2.4.1 Channel Model 12
2.4.2 Rake Receiver 12
Chapter 3 Multiple Access Interference Cancellation Scheme And Performance
Analysis 15
3.1 Conventional Detection Without Multiuser Detection 16
3.2 Parallel Interference Cancellation 18
3.2.1 Conventional Parallel Interference Cancellation 18
3.2.2 Partial Parallel Interference Cancellation 22
3.3 Serial Interference Cancellation 25
3.3.1 Conventional Serial Interference Cancellation 25
3.3.2 Improve Serial Interference Cancellation 28
3.4 Groupwise Parallel Interference Cancellation 29
3.4.1 Groupwise Weighted Parallel Interference Cancellation 30
3.4.2 Weighting Factor For Low Rate Users 32
3.5 Groupwise Serial Interference Cancellation 32
3.5.1 General Groupwise Serial Interference Cancellation 32
3.5.2 Extended Groupwise Serial Interference Cancellation 34
3.6 Groupwise Hybrid Interference Cancellation 35
3.6.1 General Groupwise Hybrid Interference Cancellation 35
3.6.2 Groupwise Weighted Hybrid Interference Cancellation 37
3.7 Extension of Parallel Interference Cancellation 38
3.7.1 General Extension of Parallel Interference Cancellation 38
3.7.2 Extension of Weighted Parallel Interference Cancellation 42
3.8 Extension of Groupwise Hybrid Interference Cancellation 44
3.8.1 General Extension of Groupwise Hybrid Interference Cancellation44
3.8.2 Extension of Groupwise Weighted Hybrid InterferenceCancellation47
Chapter 4 Simulation Result and Discussion 49
4.1 Performance Using IC Schemes Under AWGN Channel 50
4.1.1 Performance Without Weighted factor 50
4.1.2 Performance Using Weighted factor 53
4.2 Performance Using IC Schemes Under Rayleigh fading Channel 56
4.3 Simulation Results 58
Chapter 5 Conclusion 78
APPENDICES
A.I Feedback Connections for 11-stage m-sequence Generator 80
Reference 84

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指導教授

蔡木金(Mu-King Tsay)

審核日期

2003-6-17

推文