博碩士論文 87324060 詳細資訊




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姓名 胡建偉(Jiann-Woei Hwu)  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平行干擾消除技術改善在多人使用干擾的分析與模擬
(Performance Analysis and Simulation of Using Parallel Interference Cancellation Technique in DS-CDMA system to Improve the Multiple Access Interference)
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摘要(中) 未來第三代無線通訊系統為了滿足人們的需求,除了語音服務之外,
甚至提供影像與數據的傳送。在這樣的前提下,寬頻分碼多工 ( Wideband
Code Division Multiple Access ; WCDMA ) 系統成為未來發展趨勢。目前使用
中的CDMA系統比起過去的無線通訊系統 ( TDMA或FDMA系統 ) 有許多的
優點,其中最大的優點是能提升系統容量,但使用者增加的同時也相對增加
了彼此間的干擾,這種干擾又稱為多重擷取干擾 ( Multiple Access Interference
; MAI )。所以本篇論文的目的在於針對這種干擾提出改善的方法,我們利
用平行干擾消除法( Parallel Interference Cancellation ; PIC ) 來增加系統效能。另
外,我們將IS-95的上鍵路徑 ( Up-link ) 調變部份做討論與模擬,並且有鑑於
系統在衰落與多路徑環境下的效能並非很理想,因此除了使用雷克 ( RAKE )
接收器來抵抗多路徑衰減 ( Multipath Fading ) 之外,還加入了通道參數估測
器( Channel Parameter Estimation ) 以改善系統效能。
最後根據我們分析與模擬的結果顯示,PIC技術確實能改善系統效能。
摘要(英) The 3th generation mobile communication system provides not only voice but also
video and data services for satisfy human request. On the premise that wideband CDMA
system becomes more improvement in the future trend. Comparisons of CDMA, TDMA
and FDMA systems, there are many advantages using CDMA in the cellular system.
The most of these advantages is increasing the system capacity. System interference will
increase by large capacity. This interference is called Multiple Access Interference ( MAI ).
In this thesis, we use Parallel Interference Cancellation Schemes to increase system
performance. We will discuss and simulate the IS-95 standard’’s modulator in Up-link path.
In the receiver design, we use RAKE structure to fight multipath fading and also join the
Channel Parameter Estimation to improve system performance.
Finally, according to our simulation results that the PIC technique is improving system
performance indeed.
關鍵字(中) ★ 直接序列展頻
★ 平行干擾消除器
★ 多重擷取干擾
★ 雷克接收機
★ 瑞雷衰減
★ 通道參數估測
關鍵字(英) ★ DS-CDMA
★ PIC
★ MAI
★ RAKE Receiver
★ Rayleigh Fading
★ Channel Parameter Estimation
論文目次 Chapter 1 Introduction
1.1 Research Background
1.2 Research Motivation
1.3 Thesis Architecture
Chapter 2 DS-CDMA System and Channel Model
2.1 Transmitter Model
2.1.1 M-ary Orthogonal Modulation Transmitter Model
2.2 Pseudo-Noise Spreading Sequence Generator
2.2.1 Maximal Length Sequences
2.3 Channel Model
2.3.1 Multi-path Fading Model
2.4 Rake Receiver Model
2.4.1 Non-coherent Rake Receiver
2.5 Channel Estimation Technique
2.5.1 Ideal on estimation of non-coherent reception
2.5.2 Estimator on Channel parameter
Chapter 3 Multiple Access Interference Cancellation Scheme And Performance Analysis
3.1 Conventional DS-CDMA System Without Multiuser Interference Cancellation
3.1.1 Receiver Performance Analysis
3.1.2 BER Performance over AWGN and Fading channel
3.2 Conventional Parallel Interference Cancellation
3.2.1 Multistage Parallel Interference Canceller Analysis
3.3 Multistage Partial Parallel Interference Cancellation
3.4 Adaptive Parallel Interference Cancellation
3.4.1 Adaptive Multistage PIC for Fading Channel
Chapter 4 Simulation Result and Discussion
4.1 Performance Using PIC Schemes Under AWGN Channel
4.2 Performance Using RAKE Receiver and Channel Estimation Under Multipath Fading
4.3 Performance Using PIC Schemes Under Two Path Rayleigh Fading Channel
4.4 Simulation Results
Chapter 5 Conclusion and Further Work
5.1 Conclusion
5.2 Further Work
APPENDICES
A.I Feedback Connections for 11-stage m-sequence Generator
A.II Correlator Output Process
Reference
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指導教授 蔡木金(Mu-King Tsay) 審核日期 2000-6-21
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