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.
出处
《光子学报》
EI
CAS
CSCD
北大核心
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
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
Optical code division multiple access （OCDMA）
Two-dimensional optical orthogonal codes
Prime code
Extend prime code
One coincidence sequence
