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在采用一维ST-OOC码的基础上,在光CDMA系统编/解码器端分别加入起/解偏器,引入偏振信息来提高码字维数,从而得到一种新型光CDMA系统多维码的构造方法。理论分析表明通过在一维系统中引入n个偏振方向,系统码字容量能相应增加为原来的n倍。数值计算表明,在采用ST-OOC码并引入两个偏振方向的二维光CDMA系统中,该方法能增加同时用户数,有效地减小系统多用户干扰,使系统的设计更经济。
Based on the one-dimensional ST-OOC code, the optical CDMA system coder / decoder respectively add / depolarizer, introduce polarization information to improve the codeword dimension, so as to get a new multi-dimensional code of CDMA system Construction method. Theoretical analysis shows that by introducing n polarization directions in a one-dimensional system, the system code word capacity can be correspondingly increased by n times. The numerical results show that this method can increase the number of simultaneous users and reduce the system multi-user interference effectively, which makes the system more economical to design in the two-dimensional optical CDMA system adopting ST-OOC code and introducing two polarization directions.