OCDMA系统中二维变重光正交码的设计及性能分析  

Acquirement and performance analysis of 2D-VWOOC for optical CDMA system

作　　者：李传起[1,2] 周园园[2] 张媛[2] 陈晖[2] 管成龙[2] 

机构地区：[1]广西师范大学电子工程学院,广西桂林541012 [2]南京信息工程大学数理学院,江苏南京210044

出　　处：《量子电子学报》2011年第5期635-640,共6页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(6097705);江苏省自然科学基金(KB2008437);江苏省高校自然科学基金(07KJB510066)资助项目

摘　　要：以单重合序列作为波长跳频序列,严格变重光正交码作为时间扩频序列,构造一种新的跳频/扩时二维变重光正交码。对所构造二维码的自相关和互相关性能进行了详细分析,得出互相关均值的表达式,并对该二维地址码的多址干扰误码率进行了仿真比较和理论分析。结果表明,确定严格变重光正交码的参数和单重合序列的长度,增加波长数会增加码字容量并降低系统的误码率;确定单重合序列的参数和严格变重光正交码的码重和码字个数,增加码长将降低系统的误码率。Based on OCS for wavelength hopping and strict VW-OOC for time spreading, a new ram- ily, named one-coincide sequence/strict wavelength optical orthogonal code （OCS/SVW-OOC）, of twodimension wavelength-hopping/time-spreading variable-weight optical orthogonal code （VW-OOC） is constructed. Auto-correlation and cross-correlation performances of OCS/SVW-OOC are analyzed in detail and the mean value of cross-correlation is reduced The bit error ratio （BER） for the 2D code was simulated and compared. The simulation results show that for the given parameters of SVW-OOC and length of OCS, not only the BER of OCS/SVW-OOC decreases, but also the capacity increases, when the number of wavelengths increases. And for the given parameters of OCS, code weight and number of SVW-OOC, the BER of OCS/SVW-OOC decreases when the code length of SVW-OOC increases

关 键 词：光通信 二维变重光正交码 严格变重光正交码 单重合序列 

分 类 号：TN921.2[电子电信—通信与信息系统]