光码分多址接入系统中Chebyshev映射混沌码的实现  

Implementation of Chaotic Codes Using Chebyshev-Map in OCDMA System of Access Networks

作　　者：郑志华[1,2] 钱宗珏[1] 寿国础[1] 胡怡红[1] 

机构地区：[1]北京邮电大学信息与通信工程学院,北京100876 [2]中北大学机电工程学院,太原030051

出　　处：《北京邮电大学学报》2009年第6期67-71,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：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)

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.The structure of optical code division multiple access （OCDMA） system based on Chebyshev-map chaotic codes is investigated in passive optical networks. The system can support more subscribers by providing the different codes at same wavelength channel. The scheme on chaotic spread spectrum sequences using Chebyshev-map is presented, which is taken as subscriber address codes. The performance of this system is analyzed. The simulation results show that the chaotic sequences have good correlation properties, and restrain the influence of multiple access interference. The bit er- ror rate performance of the proposed system is improved by about 1--3 orders of magnitude better than that of single OCDMA system, and obtains about 1 order of magnitude improvement relative to traditional optical orthogonal codes.

关 键 词：无源光网络 光码分多址 混沌序列 CHEBYSHEV映射 

分 类 号：TN915.6[电子电信—通信与信息系统]