一种基于正交拉丁方序列和光正交码的二维光正交码MOLS/OOC

在研究正交拉丁方（OLS）与跳频序列关系的基础上,首先提出了一种新的非素数幂中奇数阶两两正交拉丁方组的构造方法;然后,以两两正交拉丁方（MOLS）序列作为波长跳频序列,以一维光正交码（OOC）作为时间扩频序列,提出了一种2D-OOC（MOLS/OOC）的构造方法;最后,对构造的新2D-OOC的性能进行了仿真.与PC/OOC等码字对比,二维MOLS/OOC码的波长数并不局限于素数,充分利用了MWOCDMA系统中的有效波长数;而且码字容量逼近理论极限.该方法构造的码字为渐近最优2D-OOC.仿真实验表明,该码字误码性能也较优越.

A new family of 2-D optical orthogonal codes MOLS / OOC based on mutually orthogonal latin square and optical orthogonal code

The relationship between orthogonal latin square（ OLS） and the frequency hopping sequence family was studied. Firstly,a new construction method was proposed for mutually orthogonal non-prime power odd order Latin square group. Secondly,a new construction method based on MOLS as wavelength hopping sequence and 1D-OOC as time spreading sequence was proposed for 2D-OOC（ MOLS / OOC）. Finally,a simulation was done for the performance of the new constructed 2D-OOC. Compared with other codes such as PC / OOC,the number of wavelength used in this 2D-OOC（ MOLS / OOC） code was not limited to a prime number,the effective wavelength of MWOCDMA was full used. Furthermore,theoretical limits were approached by code capacity. Thus,asymptotically optimal 2D-OOC was constructed by this method. By simulation analysis,the performance of bit error rate（ BER） was reduced.