使用渦輪碼改善區域多點分配服務系統的效能｜國立中央大學博碩士論文系統

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研究生：	林坤德 Kun-De Lin
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
指導教授：	蔡木金 M.K.Tsay
口試委員:
學位類別：	碩士 Master
系所名稱：	資訊電機學院 - 通訊工程學系 Department of Communication Engineering
畢業學年度：	94
語文別：	英文
論文頁數：	73
中文關鍵詞：	區域多點分配服務、渦輪碼
外文關鍵詞：	turbo code, LMDS
相關次數：	點閱：11 下載：0
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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。

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.

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

                                

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