【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.更多还原

【Abstract】 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.更多还原