准同步时域相位OCDMA系统仿真研究  

Research on simulation of quasi-synchronous coherent time-spreading OCDMA

作　　者：肖峥峰[1] 龚方平[1] 罗昭[1] 吉建华[1] 

机构地区：[1]深圳大学新技术研究中心,广东深圳518060

出　　处：《光通信研究》2010年第3期57-59,共3页Study on Optical Communications

基　　金：国家自然科学基金资助项目(60772027)

摘　　要：LA序列的非周期自相关及互相关在原点附近存在一个零相关区,将LA序列应用于光码分多址(OCDMA)系统,就可以构成准同步时域相位OCDMA系统。只要将各用户之间的延时控制在同步误差范围之内,就可以消除时域相位OCDMA系统的差拍噪声和多址干扰。文章对16个用户、数据传输速率为1 Gbit/s、传输距离为20 km的准同步时域相位OCDMA系统进行了仿真,仿真结果表明,LA码适用于准同步时域相位OCDMA系统。The aperiodic auto-correlation and cross-correlation of LA sequences have a zero correlation zone near the origin.Thus,a quasi-synchronous coherent time-spreading OCDMA system can be realized by applying the LA sequences to the OCDMA system.The beat noise and multiple-access interferences in the system can be cancelled as long as the time delay between the users is controlled within the range of synchronous errors.A quasi-synchronous coherent time-spreading 1 Gbit/s OCDMA system with 16 users and a transmission range of 20 km is simulated,the result of which indicates that the LA code is applicable to quasi-synchronous coherent time-spreading OCDMA systems.

关 键 词：光通信 光码分多址 LA码 非周期互相关函数 

分 类 号：TN929[电子电信—通信与信息系统]