基於適應性網路模糊推論系統應用於區域多點分配服務系統之相容碼率打孔渦輪碼

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研究生：	陶可欣 Ke-hsin Tao
論文名稱：	基於適應性網路模糊推論系統應用於區域多點分配服務系統之相容碼率打孔渦輪碼 ANFIS-based rate compatible punctured turbo codes for LMDS 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 - 通訊工程學系 Department of Communication Engineering
畢業學年度：	96
語文別：	英文
論文頁數：	78
中文關鍵詞：	區域多點分配服務系統、相容碼率打孔渦輪碼
外文關鍵詞：	LMDS system, rate compatible punctured turbo codes
相關次數：	點閱：11 下載：0
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LMDS系統可以滿足大部分的都市、小家庭以及大型企業用戶中所需求之語音、多媒體及數據傳輸等多樣化寬頻服務。然而，最主要影響LMDS系統的服務品質因素為雨衰及細胞內干擾。
為了減少LMDS系統中雨衰和細胞內干擾的問題，我們提出新的標準由雨衰之影響來選擇打孔模式，進而改善LMDS系統的效能。根據系統的環境，使用關於雨衰的參數來調整碼率減少冗餘位元和改進傳送率。模擬結果顯示出，在區域多點分配服務系統中，使用適應性網路模糊推論系統之相容碼率打孔渦輪碼，相較於沒有打孔的渦輪碼傳送模式中，在相似的位元錯誤率之下提升了較高的傳送率。

LMDS systems to meet most of the city, family and large enterprise customers by the demand of diversification of broadband services, such as voice, multimedia and data transmission. However, rain attenuation and inter cell interference (ICI) influence are the main factors affecting the Quality of Service (QoS) in LMDS system.
In order to reduce the impact of rain attenuation and inter cell interference in LMDS system, we propose a new criterion that can choice the puncturing patterns from the impact of rain fade, lead to improve the performance of LMDS system. According to the channel condition, we can use the parameter about rain fade to adjust the code rate which reducing the redundancy bit and improve the throughput. Simulation results show the performance with and without ANFIS (adaptive network fuzzy inference system) based rate compatible punctured turbo code in a similar BER conditions, the former upgrade a higher throughput.

摘要......................................................i
Abstract.................................................ii
誌謝....................................................iii
List of Figures..........................................vi
List of Table...........................................vii
Chapter 1 Introduction....................................1
1-1. Motivation and Objective................ ..........1
1-2. Structure of the thesis............ ...............2
Chapter 2 Background of LMDS..............................3
2-1. Local Multipoint Distribution Service (LMDS).......3
2-1-1. LMDS system consists of four parts.............4
2-1-2. Advantages of Fixed Wireless Access............5
2-1-3. FCC Band Plan for LMDS.........................6
2-2. Characteristics of Propagation Channel.............7
2-2-1. Propagation in Free Space......................7
2-3. Calculation of inter-cell interference.............8
2-3-1.The well-know radio formula.....................8
2-3-2. ITU-R Rain Attenuation Prediction Model........9
2-3-3. Cross-Polarization Discrimination (XPD).......12
2-4. Layout of Cellular Configuration..................13
2-4-1. System Deployment Trade-offs..................13
2-4-2. Cell Planning of LMDS.........................13
2-5. Link Budget Calculation...........................15
2-6. Typical architecture..............................16
2-6-1. Co-channel interference.......................17
Chapter 3 Turbo Code.....................................20
3-1. Introductions.....................................20
3-2.  Turbo code encoder...............................21
3-2-1. General Turbo code encoder....................21
3-2-2. RSC encoder...................................22
3-2-3. Interleaver...................................23
3-2-4. Output puncturing.............................24
3-3. Turbo code decoding...............................25
3-3-1. Introduction of Turbo decoding................25
3-3-2. Iteration.....................................26
3-3-3.Turbo Code decoding Procedure..................27
3-3-4. SOVA..........................................28
3-4. Control system....................................34
3-4-1. Introduction of ANFIS.........................34
3-4-2. Theory and Architecture.......................34
Chapter 4 Performance Analysis and Simulation Results....39
4-1. Simulation environment in LMDS....................40
4-1-1. Modulation Schemes in LMDS....................40
4-1-2. Coverage ratio................................41
4-1-3. Error Probabilities of Some Modulation Schemes41
4-1-4. Bit Error Rate of Modulation Schemes..........42
4-2. Performance Analysis in LMDS......................43
4-2-1. Effects of Rain...............................43
4-2-2. Effects of XPD................................47
4-2-3. Effects of beamwidth..........................51
4-3. ANFIS.............................................55
4-3-1. ANFIS Simulation..............................56
4-3-2. Simulation Results............................59
Chapter 5 Conclusions....................................63
References...............................................64

                                

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