使用渦輪碼改善區域多點分配服務系統的效能

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姓名

林坤德(Kun-De Lin) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

使用渦輪碼改善區域多點分配服務系統的效能
(To Improve The Performance of LMDS Systems Using Turbo Coding)

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摘要(中)

在各項微波傳輸技術中，LMDS可以說是最受到注目的，因為它可以提供雙向的語音、影像及數據傳輸的寬頻整合服務。LMDS能夠滿足各類型的用戶分佈與應用，從住家到商業用途均能提供服務，因此更具有彈性及擴充性。台灣在2000年三月十九日發放固網執照，即使有線寬頻傳輸應是其競爭的主軸，然而仍有業者藉助固定無線傳輸技術的應用，以提高其競爭力。由此可窺知LMDS的發展潛力。
本論文提出使用渦輪碼去減少LMDS系統的位元錯誤率，並討論在LMDS系統環境下使用渦輪碼探討不同的雨衰、調變、距離和碼率探討分析其效能。

摘要(英)

LMDS is the most obtrusive among mini-meter wave propagation techniques. Because it can provide wideband integrated services including two-way voice, video, and data transmission. The asymmetry between downstream and upstream is quite consistent with the normal data flow, particularly for residential applications. Of course the spectrum can also be used to provide symmetric traffic that would typically be required for business applications.
In this thesis we use turbo code to reduce the BER and simulate different rain rate、 modulation、 distance and code rate. By using this scheme, we can get the better data efficiency and improve the system performance.

關鍵字(中)

★ 區域多點分配服務
★ 渦輪碼

關鍵字(英)

★ turbo code
★ LMDS

論文目次

Chapter 1 Introduction 1
1-1. Motivation and Objective 1
1-2. Evolution Course of LMDS 3
Chapter 2 Background of LMDS 4
2-1. Local Multipoint Distribution Service (LMDS) 4
2-1-1. Introduction to the meaning of LMDS 4
2-1-2. Fixed Wireless Access Advantages 5
2-1-3. FCC Band Plan for LMDS 6
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 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) 15
2-4. Layout of Cellular Configuration 16
2-4-1. System Deployment Trade-offs 16
2-4-2. Frequency Reuse 17
2-4-3. Alternating Polarizations 18
2-4-4. Cell Planning of LMDS 19
2-5. Link Budget Calculation 20
2-6.Typical architecture 21
2-6-1. Co-channel interference 22
Chapter 3 Turbo Code 26
3-1. Turbo encoder 26
3-1-1 Turbo code system model 26
3-1-2 IS-2000 CDMA system 28
3-1-3 General Turbo code encoder 29
3-1-3-1 RSC encoder 30
3-1-3-2 Interleaver 33
3-2 Turbo code decoding 36
3-2-1 Turbo code decoding algorithm under AWGN channel 36
3-2-2 The MAP decoding algorithm 40
3-2-2-1 Symbol-by-symbol MAP decoding algorithm 42
3-2-2-2 Computation of , , 44
3-2-2-3 MAP decoding algorithm final result 51
Chapter 4 Performance Analysis by using Turbo code in LMDS 54
4-1. Modulation Schemes in LMDS 55
4-1-1. Dynamic Modulation in LMDS 55
4-1-2. Error Probabilities of Some Modulation Schemes 57
4-2. Simulation Performance Analysis 59
Chapter 5 Conculisions 69
References 71

參考文獻

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指導教授

蔡木金(M.K.Tsay)

審核日期

2006-7-3

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