雙躍進合作通訊在固定式無線寬頻接取系統之研究

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姓名

周高鵬(Kao-Peng Chou) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

雙躍進合作通訊在固定式無線寬頻接取系統之研究
(Study of Dual-Hop Cooperative Communications on Fixed Broadband Wireless Access Systems)

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摘要(中)

區域多點分配系統是一種採用蜂巢式細胞架構之固定式無線寬頻接取技術的通訊系統，可以提供高速雙向傳輸服務。由於系統規格的物理特性，通訊受到細胞同頻干擾和雨衰的影響。在這篇論文中，引入雙躍式合作性通訊技術來改善通訊品質和系統效能。通訊涵蓋率、頻譜效益是我們觀察通訊品質和系統效能的觀測參數。首先，我們先觀察在最佳合作式通訊架構下抗干擾的表現，並視為效能最佳可達界限。由於最佳化的系統架構在傳遞器的使用量上過於龐大，在實現上有成本過高的缺點。為了克服成本上的考量，我們在這篇論文中提出了兩個新的架構，”單環跳躍傳遞” 和”雙環跳躍傳遞”。在單環跳躍傳遞上，我們專注在通訊涵蓋率的考量，利用較少的傳遞器在惡劣的通訊環境下達到期望的通訊涵蓋率。而雙環跳躍傳遞則是在單環跳躍傳遞的架構下多架設了一環傳遞器，目的是補償另一環傳遞效率較低的使用者區塊，進而達到較高的整體系統效益。

摘要(英)

LMDS is a broadband wireless access technology, which provides high data rates communications. Caused by the physic nature, LMDS suffered from inter-cell interference and rain attenuation. In this thesis, we involve the dual-hop cooperative communication system against those effects. First we observe the optimal case which every subscriber has a corresponding relay at the optimal position. The performance be improved but the architecture is not practical using too many relays. So we invent two practical relaying architectures, namely “simplex ring relaying” and “duplex ring relaying”. In the case of simplex ring relaying, we focus on optimize the coverage ratio. Then in duplex ring relaying, we enhance the simplex ring relaying by add another ring relays inside the first ring to maximize the spectrum efficiency. Then we compare those architectures with conventional LMDS.

關鍵字(中)

★ 合作式通訊
★ 雙躍進
★ 固定式無線寬頻
★ 區域多點分配服務系統

關鍵字(英)

★ cooperative communications
★ dual hop
★ LMDS
★ relay

論文目次

中文摘要 i
Abstracts ii
誌謝 iii
Contents iv
List of Figures vi
List of Table viii
Chapter 1 Introduction 1
1.1 Motivation and Objective 1
1.2 Structure of the thesis 3
Chapter 2 Background of LMDS 4
2.1 Local Multipoint Distribution Service (LMDS) 4
2.1.1 LMDS units 5
2.1.2 Advantages of Fixed Wireless Access 5
2.1.3 FCC band plan for LMDS 7
2.2 Characteristics of propagation channel 8
2.2.1 Propagation in free space 8
2.2.2 Propagation loss 9
2.3 Inter Cell Interference (ICI) calculation 10
2.3.1 The well-know radio formula 10
2.3.2 ITU-R rain attenuation prediction model 11
2.3.3 Cross-Polarization Discrimination (XPD) 14
2.3.4 Path loss exponent (α) 15
2.4 Layout of cellular configuration 16
2.4.1 System deployment trade-offs 16
2.4.2 Frequency reuse 16
2.4.3 Alternating polarizations 17
2.4.4 Cell planning of LMDS 18
2.5 Link Budget Calculation 20
2.6 Typical architecture 21
2.7 Co-channel interference 22
Chapter 3 Dual-hop system 26
3.1 Regenerative: (Decode-and-Forward) 26
3.2 Non-regenerative: (Amplify-and-Forward) 27
3.3 Dual-hop system model 28
3.4 Relaying protocol 30
3.4.1 OAF protocol 30
3.4.2 NAF protocol 32
3.5 Proposed Dual-hop architecture for LMDS 35
3.5.1 Relay location 35
3.5.2 Optimal relay architecture 37
3.5.3 Simplex ring relay architecture 38
3.5.4 Duplex ring relay architecture 40
Chapter 4 Performance Analysis and Simulation Results 41
4.1 Simulation environment in LMDS 41
4.1.1 Modulation Schemes in LMDS 41
4.1.2 Coverage ratio 42
4.1.3 Error Probabilities of Some Modulation Schemes 43
4.1.4 Bit Error Rate of Modulation Schemes 44
4.2 Performance Analysis in LMDS 45
4.2.1 SINR distribution in different rain rate 45
4.2.2 Coverage ratio in different rain rate 50
4.2.3 Spectrum efficiency in different rain rate 54
Chapter 5 Conclusions 57
Reference 58

參考文獻

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指導教授

蔡木金、林嘉慶
(Mu-King Tsay、Jia-Chin Lin)

審核日期

2009-7-13

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