基于变码重光正交码光码分多址系统的性能分析  

Investigation on Performance of OCDMA System Based on Variable-Weight Optical Orthogonal Codes

作　　者：杨志程[1] 敖发良[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《广西通信技术》2007年第4期26-29,共4页Guangxi Communication Technology

摘　　要：光正交码是一种具有良好自相关性和互相关性的(0,1)序列,被广泛的运用于光码分多址(OCDMA)系统。由于光正交码中所有码字的码重都固定不变,使得码字的容量不大。我们提出了变码重的光正交码,并对其进行了理论分析。最后,给出了数值仿真结果。结果表明,采用变码重光正交码的系统无论是在可接入用户数还是在系统误码率上都优于采用固定码重光正交码的系统。研究结果对OCDMA系统参数的选取具有一定的参考价值。An optical orthogonal code（OOC） is a family of （0, 1） sequences with good auto-and cross-correlation properties; they are widely used in optical code division multiple access（OCDMA） system. But the capacity of OOC is verysmall, the reason is that the weight of each codeword is the same. We present the variable-weight OOC, which can provide large codeword. Furthermore, we analysis the performance of variable-weight OOC in optical CDMA system. At last, numerical simulations are carried out, the results show that whether the number of users or the bit error rate（BER）,the performance of system which used variable-weight OOC is better than that of which used OOC. The findings have the certain reference value to the OCDMA system parameter selection.

关 键 词：光码分多址 变码重光正交码 误码率 光硬限幅器 

分 类 号：TN929.11[电子电信—通信与信息系统]