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研究生： 劉威廷
Wei-Ting Liu
論文名稱： 直接序列展頻系統利用干擾消除與M_ary正交調變技術的分析與模擬
Simulation and Performance Analysis of Interference Cancellation with M-ary Orthogonal Modulation for DS-CDMA system
指導教授： 蔡木金
Mu-King Tsay
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 電機工程學系
Department of Electrical Engineering
畢業學年度： 90
語文別： 中文
論文頁數： 83
中文關鍵詞： 多人使用干擾 、干擾消除機制 、分碼多重調變
外文關鍵詞： multiple access interference, interference cancellation scheme, cdma
相關次數： 點閱：6  下載：0 
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    • 本篇論文使用了M-ary 正交調變的DS-CDMA系統，模擬結果顯示出M-ary正交調變可以降低多人使用干擾效應 (MAI)。由於系統通道模型為AWGN與Rayleigh fading，所以使用了RAKE接收架構與Channel Estimation來抵抗多路徑通道的衰落的效應。
    接著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)與串聯干擾消除機制(SIC)的優缺點。同時我們也考慮了混合干擾消除機制(HIC)，因為它能夠改善PIC與SIC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。

    In this thesis, we use the M-ary orthogonal modulation in DS/CDMA system. The results show the Multiple Access Interference (MAI) is reduced due to M-ary orthogonal modulation compared with the case without orthogonal modulation. The system simulation models include AWGN and Rayleigh fading channel. So the rake structure and channel estimation technique can be used to combat multipath fading.
    Then we analyze and simulate different kinds of interference cancellation (IC) schemes to overcome MAI in DS/CDMA. Among ICs, we can see the advantage and disadvantage of traditional parallel interference cancellation (PIC) and serial interference cancellation (SIC). A hybrid interference cancellation by combining SIC and PIC is also considered. It can improves the disadvantage of PIC and SIC.
    The simulation results show that the performance enhancement can be achieved through M-ary orthogonal modulation, channel estimation and Improved IC technique.

    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 3 Chapter 2 DS-CDMA System and Channel Model 5 2.1 Transmitter Model 5 2.1.1 M-ary Orthogonal Modulation Transmitter Model 6 2.2 Pseudo-Noise Spreading Sequence Generator 8 2.2.1 Maximal Length Sequences 9 2.3 Channel Model 11 2.3.1 Multi-path Fading Model 11 2.4 Rake Receiver Model 12 2.4.1 Non-coherent Rake Receiver 12 2.5 Channel Estimation Technique 15 2.5.1 Idea on estimation of non-coherent reception 15 2.5.2 Channel Parameter Estimator 16 Chapter 3 Multiple Access Interference Cancellation Scheme And Performance Analysis 20 3.1 Conventional Detection Without Multiuser Detection 21 3.1.1 Receiver Performance Analysis 22 3.1.2 BER Performance under AWGN channel 27 3.1.3 BER Performance under Fading channel 28 3.2 Parallel Interference Cancellation 29 3.2.1 Conventional Parallel Interference Cancellation 29 3.2.2 Conventional PIC with channel parameter estimation 33 3.2.3 Partial Parallel Interference Cancellation 36 3.3 Serial Interference Cancellation 39 3.3.1 Improve Serial Interference Cancellation…………………...43 3.4 Hybrid Interference Cancellation 44 3.4.1 Improve Hybrid Interference Cancellation 49 Chapter 4 Simulation Result and Discussion 51 4.1 Performance of Some Basic Scheme 52 4.1.1 Performance of M-ary Orthogonal Modulation 52 4.2.1 Performance Using RAKE Receiver And Channel Estimation Under Rayleigh Fading 53 4.2 Performance Using IC Schemes Under AWGN Channel 54 4.3 Performance Using IC Schemes Under Rayleigh Fading Channel 57 4.4 Compare PIC With Hybrid IC Under AWGN Channel For Multirate DS-CDMA 58 4.5 Simulation Results 61 Chapter 5 Conclusion 72 APPENDICES A.I Feedback Connections for 11-stage m-sequence Generator 74 A.II Correlator Output Process 78 Reference 80

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