| 光码分多址接入系统中Chebyshev映射混沌码的实现 |
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| 引用本文： | 郑志华,钱宗珏,寿国础,胡怡红.光码分多址接入系统中Chebyshev映射混沌码的实现[J].北京邮电大学学报,2009,32(6):67-71. |
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| 作者姓名： | 郑志华 钱宗珏 寿国础 胡怡红 |
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| 作者单位： | 北京邮电大学,信息与通信工程学院,北京,100876;中北大学,机电工程学院,太原,030051;北京邮电大学,信息与通信工程学院,北京,100876 |
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| 基金项目： | 国家自然科学基金项目(60672025); 国家高技术研究发展计划项目(2008AA01Z218) |
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| 摘 要： | 研究了无源光网络中基于Chebyshev映射混沌扩频码的光码分多址（OCDMA）接入系统，该系统通过在同一波长信道中采用不同的码字，有效增加了用户数. 提出了利用Chebyshev映射产生混沌扩频序列的实现方案，并将序列作为系统中的用户地址码. 系统性能的仿真结果表明，所产生的混沌序列具有良好的相关性，可以抑制系统中的多址干扰；系统的误码率性能得到改善，较单纯的OCDMA系统可提高约1～3个数量级，同时较传统光正交码可提高约1个数量级.
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| 关 键 词： | 无源光网络 光码分多址 混沌序列 Chebyshev映射 |
| 收稿时间： | 2009-3-26 |
| 修稿时间： | 2009-9-9 |
Implementation of Chaotic Codes Using Chebyshev-Map in OCDMA System of Access Networks |
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| ZHENG Zhi-hua,QIAN Zong-jue,SHOU Guo-chu,HU Yi-hong.Implementation of Chaotic Codes Using Chebyshev-Map in OCDMA System of Access Networks[J].Journal of Beijing University of Posts and Telecommunications,2009,32(6):67-71. |
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| Authors: | ZHENG Zhi-hua QIAN Zong-jue SHOU Guo-chu HU Yi-hong |
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| Affiliation: | ZHENG Zhi-hua1,2,QIAN Zong-jue1,SHOU Guo-chu1,HU Yi-hong1 (1.School of Information , Communication Engineering,Beijing University of Posts , Telecommunications,Beijing 100876,China,2.School of Mechanical , Electronic Engineering,North University of China,Taiyuan 030051,China) |
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| Abstract: | The overall structure and scheme of optical code division multiple access (OCDMA) system were presented based on Chebyshev-map chaotic codes in optical access networks. The system supports more users by providing the different codes at same wavelength channel. The system generated numerous good-performance sequences by Chebyshev-map chaotic spread spectrum and these sequences are suitable to be subscriber address codes. Simulation results demonstrate that the spread spectrum sequences have good correlation properties, reducing the influence of multi-access interference (MAI) and increasing security. The bit error rate performance of the proposed system achieve better than that of single OCDMA system and optical orthogonal codes (OOC). So this system has a wide application prospect. |
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| Keywords: | optical code division multiple access wavelength division multiplexing passive optical network chaotic spread spectrum Chebyshev-map |
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