一种基于扩展素数码和单重合序列的二维光正交码EPC/OCS  

A New Family of Two-Dimensional Optical Orthogonal Codes EPC/OCS Based on Extend Prime Code and One-Coincidence Sequence

作　　者：吉建华[1] 徐铭[1] 张志朋[1] 杨淑雯[1] 

机构地区：[1]深圳大学新技术研究中心,深圳518060

出　　处：《光子学报》2007年第7期1285-1288,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(60132040);广东省自然科学基金(530102804300855);深圳大学基金(200634)资助

摘　　要：以扩展素数码(EPC)作为时间扩频伪随机序列,单重合序列(OCS)作为波长跳频伪随机序列,构造了一种新的二维光正交码EPC/OCS,并分析了码字的互相关性能.与修正素数跳频码MPHC相比,EPC/OCS的波长数并不局限于素数,可以是任意整数,不仅构造灵活,而且可充分利用MWOCDMA系统的有效波长数.当系统的有效波长数大于某个素数时,EPC/OCS不仅码字容量大于MPHC,而且互相关性能也有所改善.理论分析表明,EPC/OCS可降低MW OCDMA系统误码率.A new two-dimensional optical orthogonal codes named EPC/OCS is firstly constructed, using EPC（extend prime code） for time spreading and OCS（one-coincidence sequence） for wavelength hopping. Cross-correlation performance of EPC/OCS is analyzed. Compared with MPHC, the number of wavelengths for EPC/OCS is not limited to prime number. EPC/OCS can be constructed flexibly, and also can use available wavelengths adequately. When the number of wavelengths is larger than prime number, EPC/OCS not only has larger code cardinality, but also has better cross-correlation performance. Theoretical analysis shows that EPC/OCS can reduce the bit error rate（BER） of MW OCDMA networks.

关 键 词：光码分多址 二维光正交码 素数码 扩展素数码 单重合序列 

分 类 号：TN929.11[电子电信—通信与信息系统]