相容碼率打孔渦輪碼應用於區域多點分配服務系統

簡易檢索 / 詳目顯示

回結果列表

研究生：	闕振哲 Jhen-jhe Cyue
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
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：	95
語文別：	英文
論文頁數：	85
中文關鍵詞：	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
外文關鍵詞：	LMDS system, rain fade, Puncture, inter-, Turbo code
相關次數：	點閱：17 下載：0
分享至:	分享至facebook 分享至twitter

查詢本校圖書館目錄查詢臺灣博碩士論文知識加值系統勘誤回報

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。

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.

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

                                

[1] D. A. Gray, “A broadband wireless access system at 28 GHz,” in Proc. NIST-Cosponsored Conf. on Wireless Commun., Boulder, CO, pp. 1–7, 11–13 Aug. 1997.
[2] S. Farahvash and M. Kavehrad, “Co-channelInterferenceAssessment for Line-of-Sight and Nearly Line-of-Sight Millimeter-Waves Cellular LMDS Architecture,” International Journal of Wireless Information Networks (Kluwer Academic Publishers), Vol. 7, No. 4, 2000
[3] Propagation Data and Prediction Methods Required for The Design of Terrestrial Line-of-sight Systems, Rec. ITU-R P.530-8.
[4] Shieh Chiu-wen “The Engineering of K Band Digital Microwave Systems,” Telecommunication Technique Journal, Vol. 1, No. 2, May 1997.
[5] B Papazian Peter., George A. Hufford, Robert J. Achatz and Randy Hoffman, “Study of the Local Multipoint Distribution Service Radio Channel,” IEEE Transactions on Broadcasting, Vol. 43, No. 2, June 1997.
[6] Chih-Yuan Chu and K.S. Chen, "Effects of Rain Fading on the Efficiency of the Ka-band LMDS System in the Taiwan Area," IEEE Transactions on vehicular technology, January 2005.
[7] Joachim Hagenauer, Peter Hoeher, "A Viterbi Algorithm with Soft-Decision Output and its Applications," IEEE 1989.
[8] M. K Tsay, Z. S. Lee, and C. H. Liao, “Variable range power control for downlink CDMA-based LMDS systems,” Proc. 1st Int. Conf. Commun. Elect. (2006 ICCE) Vietnam, Oct. 2006.
[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.
[10] C.H. Lee, B.Y. Chung, and S.H. Lee, Dynamic modulation scheme in consideration of cell interference for LMDS, Proc. Int. Conf. Commun. Tech., (1998), S38-8-1 – S38-8-5.
[11] Y. Yasuda, K. Kashiki, Y. Hirata, ”High Rate Punctured Convolutional Codes for Soft Decision Viterbi Decoding,”IEEE Trans. on Com., Vol. COM-32, pp. 315-319, Mar. 1984.
[12] J. Hagenauer, ”Rate-Compatible Punctured Convolutional Codes (RCPC Codes) and their Applications,”IEEE Trans. on Com., Vol. 36, NO. 4, pp. 389-400, Apr. 1988
[13]G.D. Forney, ”The Viterbi Algorithm,’’ Proc. of the IEEE, Vol. 61, No. 3, pp. 268-278, Mar. 73
[14] S.Farahvash and M. Kavehrad, “Co-channel Interference Assessment for Line-of-Sight and Nearly Line-of-Sight Millimeter-Waves Cellular LMDS Architecture,” International Journal of Wireless Information Networks (Kluwer Academic Publishers), Vol. 7, No. 4, 2000.
[15] Chih-Yuan Chu and K.S. Chen, "Effects of Rain Fading on the Efficiency of the Ka-band LMDS System in the Taiwan Area," IEEE Transactions on vehicular technology, January 2005.
[16] Vincentzio Roman “Frequency Reuse and System Deployment in Local Multipoint Distribution Service,” IEEE Personal Communications, December 1999.
[17] Interim V&V Text for CDMA-2000 Physical Layer (Revision 8.3), TIA, 1999
[18] Hikmet sari ”Some Design Issues in Local Multipoint Distribution System,” IEEE, 1998.
[19] Mu-King Tsay and Fu-Tung Wang, ”A Twisted Sector Cellular Pattern in Local Multipoint Distribution System,” Journal of the Chinese Institute of Electrical Engineering , Vol.10, No3. 2003.
[20] Mustafa Eroz, A.Roger Hammons Jr., “On the design of prunable interleavers for Turbo codes,” in Proc. IEEE VTC’99, Houston, TX, May15-19, 1999.
[21] Jin Young Kim “Parallel Concatenated Convolutional Coding for an LMDS System” IEEE TRANSACTIONS ON BROADCASTING, VOL. 46, SEPTEMBER 2000, pp.206-214.
[22] Ranjan Bose “Improving Capacity in LMDS Network Using Trellis-Coded Modulation” EURASIP Journal on Wireless Communication and Networking 2004:2, 365-373
[23] Jian Qi “TURBO CODE IN IS-2000 CODE DIVISION MULTIPLE ACCESS COMMUNICATIONS UNDER FADING” B.S. The Northwest Telecommunications Engineering Institute, 1983.
[24] Mustafa Eroz, A.Roger Hammons Jr., “On the design of prunable interleavers for Turbo codes,” in Proc. IEEE VTC’99, Houston, TX, May15-19, 1999.
[25] C. Berrou, A. Glavieux, and P. Thitimajshima, “Near Shannon Limit Error-Correcting Coding and Decoding-Turbo Codes,” Proc. Int’l Conf. Communications, May 1993, pp. 1064-1070.
[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.

簡易檢索 / 詳目顯示

相關論文