基于DS/FH的混合OCDMA/WDM网络
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摘要
光码分多址(OCDMA)技术是一种扩频技术,它将光纤通信和CDMA技术结合起来,允许所有的信道同时共享同一带宽,可满足目前及将来通信发展中异步、高速、宽带、可靠的要求。在未来的全光网络中,将扮演重要的角色。而把光码分复用技术与光波分复用(WDM)组成混合网络并应用于局域网中将是未来光码分多址的发展方向。
本文在研究国内外最新研究成果基础上,对混合OCDMA/WDM网络的拓扑结构和OCDMA的扩频码和编解码器作出一定改进。
首先,在对网络中的存在的各种拓扑结构分析和比较前提下,构建一种基于树形和环形的混合OCDMA/WDM网络拓扑结构。并且介绍了网络运行时,网络节点中光分叉复用器上下路端口情况。
其次,针对进一步扩容需要增加码长与编解码器实现困难的矛盾的问题,本文以光正交码为基础,分析了DS-OCDMA、FH-OCDMA的扩频码。然后以光纤延迟线编解码器和光纤光栅编解码器为基本元件组成混合DS/FH编解码器,使系统的编码过程能在时域和频域上同时进行,可以有效的解决系统中的码字问题。
最后,基于混合DS/FH编解码技术,建立了一种混合OCDMA/WDM网络模型;然后通过对该网络系统的数学模型画出模拟曲线图来分析比较混合OCDMA/WDM系统的性能;最后通过实验证明该混合网络系统具有可行性,DS/FH编解码技术可以有效地解决地址码码字的限制问题,混合OCDMA/WDM比单纯的OCDMA更有实用性。
Optical code-division multiple access (OCDMA) technology is a spread spectrum technique which combines optical fiber communications with CDMA technique, which allows all of communication development at present and in the future: asynchrony, high-speed, broad-band, reliability. It will play an important role in the processof all-optical networks. With the optical code division multiplexing and optical wavelength division multiplexing (WDM) network composed of mixed and it applied to the local area network are the most promising trends in OCDMA development.
This paper do some research by analyzing and finishing the previous work on iris recognition, and propose some new ideas in hybrid WDM/OCDMA system topology and OCDMA code technology feature extraction.
First of all, in the presence of a variety of network topology analysis and comparison of the premise, is proposed OCDMA/WDM network based on the mixed tree and ring topology. It describes the operation of the network, the network node bifurcation optical multiplexer ports up and down road conditions.
Second, for the system to increase the code word with code weight and code length also increased the problem, this paper introduces DS-OCDMA, FH-OCDMA spreading code. The hybrid DS/FH code structure is based fiber delay line and fiber grating-based code. That effectively solve the word problem in the system code, because the coding of the system in time domain and frequency domain simultaneously.
Finally, based on hybrid DS/FH code technology, the establishment of a hybrid OCDMA/WDM network model. Then the system through the Matlab simulation model to compare and analyze the performance of the hybrid OCDMA/WDM systems. After that, the experiment proved the feasibility of the hybrid network system has. The hybrid DS/FH code technology can effectively solve the address code constraints. The hybrid OCDMA/WDM and the pure OCDMA more than mere practicality.
本文在研究国内外最新研究成果基础上,对混合OCDMA/WDM网络的拓扑结构和OCDMA的扩频码和编解码器作出一定改进。
首先,在对网络中的存在的各种拓扑结构分析和比较前提下,构建一种基于树形和环形的混合OCDMA/WDM网络拓扑结构。并且介绍了网络运行时,网络节点中光分叉复用器上下路端口情况。
其次,针对进一步扩容需要增加码长与编解码器实现困难的矛盾的问题,本文以光正交码为基础,分析了DS-OCDMA、FH-OCDMA的扩频码。然后以光纤延迟线编解码器和光纤光栅编解码器为基本元件组成混合DS/FH编解码器,使系统的编码过程能在时域和频域上同时进行,可以有效的解决系统中的码字问题。
最后,基于混合DS/FH编解码技术,建立了一种混合OCDMA/WDM网络模型;然后通过对该网络系统的数学模型画出模拟曲线图来分析比较混合OCDMA/WDM系统的性能;最后通过实验证明该混合网络系统具有可行性,DS/FH编解码技术可以有效地解决地址码码字的限制问题,混合OCDMA/WDM比单纯的OCDMA更有实用性。
Optical code-division multiple access (OCDMA) technology is a spread spectrum technique which combines optical fiber communications with CDMA technique, which allows all of communication development at present and in the future: asynchrony, high-speed, broad-band, reliability. It will play an important role in the processof all-optical networks. With the optical code division multiplexing and optical wavelength division multiplexing (WDM) network composed of mixed and it applied to the local area network are the most promising trends in OCDMA development.
This paper do some research by analyzing and finishing the previous work on iris recognition, and propose some new ideas in hybrid WDM/OCDMA system topology and OCDMA code technology feature extraction.
First of all, in the presence of a variety of network topology analysis and comparison of the premise, is proposed OCDMA/WDM network based on the mixed tree and ring topology. It describes the operation of the network, the network node bifurcation optical multiplexer ports up and down road conditions.
Second, for the system to increase the code word with code weight and code length also increased the problem, this paper introduces DS-OCDMA, FH-OCDMA spreading code. The hybrid DS/FH code structure is based fiber delay line and fiber grating-based code. That effectively solve the word problem in the system code, because the coding of the system in time domain and frequency domain simultaneously.
Finally, based on hybrid DS/FH code technology, the establishment of a hybrid OCDMA/WDM network model. Then the system through the Matlab simulation model to compare and analyze the performance of the hybrid OCDMA/WDM systems. After that, the experiment proved the feasibility of the hybrid network system has. The hybrid DS/FH code technology can effectively solve the address code constraints. The hybrid OCDMA/WDM and the pure OCDMA more than mere practicality.
引文
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2.程艳丽. CDMA2000分组域核心网移动IP技术.电子设计工程, 2010, 7:30-32
3.刘攀登.下一代光接入网—WDM/OCDMA混合网络.广东通信技术, 2009, 12(5):14-18
4.金亮亮,毛培法,张江鑫.光复用技术及其在光纤通信系统中的应用.通信技术,2002,131(11):36-38
5.李锐,李洪祚,高晓来. OTDM(光时分复用)技术的现状和展望.长春师范学院学报, 2008,27(6):31-34
6.李叶芳,王晓旭,柳华.波分复用器在光纤通信中的应用.物理与工程,2007,17(5):26-28
7.张有琳. CWDM在城域网构建中的运用.工程技术,2006, 1(18):24-28
8.刘述一.浅析通信行业中的DWDM技术.科技信息,2009,5:79
9.高屹然,林金桐. OCDM技术的研究. [北京邮电大学博士学位论文].2004:2-5
10.程世盛.利用OCDMA和WDM技术构建全光网络.光子技术,2006,14(4):217-219
11.岳文静.混合WDM+OCDMA系统的性能分析. [太原理工大学硕士学位论文]. 2006:1-4
12.杨淑雯,殷洪玺.光码分多址全光网络实现方案.电子学报,2001,29(8):1148-1150
13.杨明,狄卫国,刘颖娜.一种基于OCDMA技术实现局域网随机接入的方法.中兴通信技术, 2007, 13(3):47-49
14.董海峰. OCDMA通信技术及其新发展.光电子技术, 2003,12(1):52-57
15. ZouWei, H. Ghafouri-Shiraz,H. M. Shalaby. New code families for fiber- bragg- grating-based spectral-amplitude-coding optical CDMA systems. IEEE Photonic Technologyletters, 2001, (13):890-892
16. S. P. Wan,Y. Hu. Two dimension optical CDMA differential system with Prime/OOCcodes. IEEE Photonics Technology letters, 2001, 13(12):1373-1375
17.晏力.光通信网的光码分多址(OCDMA)技术.渝州大学学报(自然科学版), 2002,19(4):83-86
18. Davis P A,Shaar A A. Asynchronous multiplexing for an optical-fiber local areanetwork. Electronics Letters, 1983, 19(10):390-392
19. D. E. N. Davies,G. W. James. Fibre-optical tapped delay line filter employing coherentoptical processing. Electronics Letters,1984, (20):96-97
20. J. A. Salehi. Code division multiple-access techniques in optical fiber networks-partⅠ:fundamental principles. IEEE Transactions on communications,1989,37(8):825-833
21. H. Fathallah,L. A. Rusch, S. LaRochelle. Optical frequency-hopmultiple access communications system, 1998, (3):1269-1273
22. S. Park,B. K. Kim,C. S. Park. Performance enhancement using the bipolar capacity ofbipolar coded fiber Bragg gratings and balanced detection in the spectral encodedcode-division-multiple-accesssystems. Optics ommunications, 2004, 230(4-6): 319-324
23. S. S. Min,Y. H. Won. Optical CDMA system with the least multiple access interferenceunder arbitrary restrictions. Optics Communications,2003,228(4-6):309-318
24. T. W. F. Chang,E. H. Sargent. Optimizing Spectral Efficiency in Multi-wavelength Optical CDMA System. IEEE Transactions on Communications, 2003, 51(9):1442-1445
25. Chovan J,Uherek F, Peter H. Performance analysis of an optical CDMA system withnon-ideal optical hard-limiters. Optics Communications, 2003, 216(4-6):289-297
26.王福晶.光码分多址OCDMA通信系统研究及实现. [浙江大学硕士学位论文].2006:1-5
27.李川,张以谟.光纤光栅原理,技术与传感应用.北京:科学出版社, 2005,10
28.丁美玲.基于FBG编解码器的光码分多址系统, [浙江大学博士学位论文]. 2002:1
29. J. F. Huang,C. C. Yang. Reduction of Multiple-Access Interference in Fiber- Grating-Based Optical CDMA Network. IEEE Transactions on Communications, 2005, 50(10):1680-1687
30. J. A. Azana,P. Kockaert. Generation of a 100-GHz optical pulse train by pulserepetition-rate multiplication using superimposed fiber Bragg gratings. IEEEPhotonics Technology Letters, 2003, 15(3):413-415
31. Fouli K,Maier M. OCDMA and optical coding:Principles, applications, andchallenges. IEEE Communications Magazine, 2007, 45(8):27-34
32.蔡茂国,杨淑雯,殷洪玺.光码分多址全光网络实现方案.电子学报, 2001, 29(8):1148-1150
33.左超,马文华.基于频谱分割的光码分多址接入系统实验研究.中国激光, 2003, 30(1):41-44
34.高泽华,钱宗珏.利用薄膜腔实现OCDMA的编解码方案研究.仪器仪表学报, 2002, 23(2):161-165
35. Yubao Wang, Yiran Gao,Jian Wu, et al. Performance Analysis for a Novel RingNetwork System. Journal of Optical Communications, 2005, 26(6):264-267
36.张崇富,邱昆,陈华容.波分复用/光码分多址网络性能研究.电子科技大学学报, 2005, 34(4):433-436
37.吉建华,吴琛.基于BCH信道编码的FFH-OCDMA系统.光电子·激光, 2002, 13(11):1126-1136
38. Ji Jianhua,Xu Ming,Yang Shuwen. Research on receiver’s optimum threshold inmulti-wavelength OCDMA based on maximum likelihood principle. Guangzi Xuebao, 2007, 36(4):698-701
39.李晓滨,孙玉勇,宋建中.可调串行光码分多址编码器/解码器.中国激光, 2001, 30(2):353-356
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