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姓名 闕振哲(Jhen-jhe Cyue)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 相容碼率打孔渦輪碼應用於區域多點分配服務系統
(Rate Compatible Punctured Turbo Codes for LMDS Systems)
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摘要(中) LMDS系統是一項受人關注的技術,LMDS系統是使用在20-50GHz之雙向數位式細胞系統,它提供語音、多媒體及數據傳輸之服務,LMDS可以滿足各種類型使用者的需求。但是,在LMDS系統中雨衰及細胞內干擾是影響服務品質因素。
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打孔模式的選擇,導致雨衰相關有系統的相容碼率碼改進LMDS系統的效能。根據系統的環境,一個關於雨衰的參數將用來調整碼率減少冗餘位元和改進頻譜效益。模擬結果顯示提出相容碼率打孔渦輪碼在區域多點分配服務系統相較於沒有打孔的渦輪碼的方案獲得一個提升的頻譜效益。兩個方案的BER是相近的。
摘要(英) LMDS system is a two-way digital cellular system operating in 20-50 GHz, it offers the services of the audio, video, multimedia and data transmission, LMDS can meet all kinds of users’’ demands. However, rain attenuation and inter cell interference (ICI) influence the factor of Quality of Service (QoS) in LMDS system.
In order to reduce the impacts of rain fade and of inter cell interference on LMDS systems, we propose a new criterion for the choice of the puncturing patterns, lead to systematic rate-compatible codes with respect to the rain attenuation to improve the performance of LMDS systems. In accordance with the system situation, a parameter with regard to rain attenuation will be used to adjust the code rate to reduce the redundancy bit and to improve the spectrum efficiency. Simulation results show that the proposed rate compatible punctured Turbo code for LMDS systems compared with without punctured Turbo code scheme leading an improvement of spectrum efficiency. And the BER of two schemes are close.
關鍵字(中) ★ 區域多點分配服務系統
★ 渦輪碼
★ 打孔
★ 雨衰
★ 細胞內干擾
★ 服務品質
關鍵字(英) ★ LMDS system
★ rain fade
★ Puncture
★ inter-
★ Turbo code
論文目次 摘要 i
Abstracts ii
誌謝 iii
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
Chapter2 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. LMDS system consists of four parts 5
2-1-3. Advantages of Fixed Wireless Access 6
2-1-4. FCC Band Plan for LMDS 8
2-2. Characteristics of Propagation Channel 10
2-2-1. Propagation in Free Space 10
2-2-2. Propagation Loss 11
2-3. Inter-Cell interference calculation 12
2-3-1.The well-know radio formula 12
2-3-2. ITU-R Rain Attenuation Prediction Model 13
2-3-3. Cross-Polarization Discrimination (XPD) 16
2-3-4. Path loss exponent (α) 17
2-4. Layout of Cellular Configuration 18
2-4-1. System Deployment Trade-offs 18
2-4-2. Frequency Reuse 18
2-4-3. Alternating Polarizations 19
2-4-4. Cell Planning of LMDS 20
2-5. Link Budget Calculation 22
2-6. Typical architecture 23
2-6-1. Co-channel interference 24
Chapter 3 Turbo Code 28
3-1. Introductions 28
3-2. Turbo encoder 30
3-2-1. Turbo code system model 30
3-2-2. IS-2000 CDMA system 31
3-2-3. General Turbo code encoder 32
3-2-4. RSC encoder 33
3-2-5. Interleaver 34
3-2-6. Output puncturing 36
3-3. Turbo code decoding 37
3-3-1. Introduction of Turbo decoding 37
3-3-2. Iteration 38
3-3-3.Turbo Code decoding Procedure 39
3-3-4. SOVA 40
Chapter 4 Performance Analysis and Simulation Results 46
4-1. Simulation environment in LMDS 47
4-1-1. Modulation Schemes in LMDS 47
4-1-2. Coverage ratio 48
4-1-3. Error Probabilities of Some Modulation Schemes 48
4-1-4. Bit Error Rate of Modulation Schemes 49
4-2. Performance Analysis in LMDS 50
4-2-1. Effects of Rain 50
4-2-2. Effects of XPD 57
4-2-3. Effects of beam-width 61
4-2-4. Effects of Path loss exponent (α) 66
4-3. Channel quality 70
4-3-1. Simulation Results 72
Chapter 5 Conclusions 81
References 83
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[9] R. Bose, G. Bauer, A. Hayn, R. Jakoby” LOS and NLOS interference investigations for LMDS network,” Dept. of EE., IIT Delhi, Hauz Khas, 110016.
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[26] P. Jung and J. Plechinger, “Performance of rate compatible punctured turbo-codes for mobile radio applications,” IEE - Electronics Letters, vol. 33, no. 25, pp. 2102–2103, 1997.
[27] M. K Tsay and Z. S. Lee, “Improve the performance of CDMA-based LMDS by power control along with dynamic modulation,” International Joun of Electronical Engineering, vol. 13, No. 4, pp. 389-395, 2006.
指導教授 蔡木金(Mu-king Tsay) 審核日期 2007-7-9
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