差分群时延条件下基于恒模算法的模式解复用技术  

Mode demultiplexing based on CMA under the condition of differential group delay

作　　者：胡贵军[1] 王艳萍[1] 闫李 李公羽[1] 李莉[1] 

机构地区：[1]吉林大学通信工程学院,长春130012

出　　处：《吉林大学学报（工学版）》2015年第3期961-965,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(61177066);吉林省科技发展计划项目(20120761);长春市科技局国际合作项目(2011105);教育部留学回国人员科研启动基金项目

摘　　要：为了改善存在差分群时延(Differential group delay,DGD)情况下模式复用系统的解复用性能,采用基于恒模算法(Constant modulus algorithm,CMA)的MIMO均衡器对2×2模式复用系统的输出信号进行了解复用,利用CMA更新迭代MIMO均衡器的抽头系数。仿真结果表明,该算法能够成功实现带有串扰和时延的信号解复用,并且具有很好的收敛性。在系统信噪比大于18.25 d B时,系统误码率均能达到10-5量级,满足通信系统的要求。In order to improve the demultiplexing performance of the mode division multiplexing system, which has Differential Group Delay （DGD）, the MIMO equalizer based on Constant Modulus Algorithm （CMA） is used to demultiplex the received signal, in which the SMA is used to iterate and update the tap coefficients of the MIMO equalizer. Simulation results show that the algorithm can successfully demultiplex the received signals with crosstalk and delay and has good convergence. When the Optical Signal Noise Ratio （OSNR） in the system is greater than 18.25 dB, the Bit Error Rate （BER） of the system can reach 10^-5s order magnitude, which meets the requirements of the communication system.

关 键 词：通信技术 光纤通信 模式复用 恒模算法 差分群时延 

分 类 号：TN913.7[电子电信—通信与信息系统]