抑制多用户干扰的串行反馈干扰抑制算法研究  

Serial feedback interference suppression algorithm for multi-user interference suppression

作　　者：苏国瑞 林浩坤 蒲涛 郑吉林 谭业腾 牟卫峰 SU Guorui;LIN Haokun;PU Tao;ZHENG Jilin;TAN Yeteng;MOU Weifeng(College of Communications Engineering,Army Engineering University of PLA,Nanjing 210007,China;School of Software Engineering,Huazhong University of Science and Technology,Wuhan 430070,China;College of Information and Communication,National University of Defense Technology,Wuhan 430010,China)

机构地区：[1]陆军工程大学通信工程学院,江苏南京210007 [2]华中科技大学软件学院,湖北武汉430070 [3]国防科技大学信息与通信学院,湖北武汉430010

出　　处：《量子电子学报》2021年第6期880-888,共9页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金,61475193,61177065,61174199。

摘　　要：在多用户光码分多址(OCDMA)传输系统中,多用户干扰(MAI)严重影响系统传输性能。针对系统中多用户干扰来源于各用户码字不完全正交的特点,采用码字的自、互相关函数表达接收信号与系统损伤,引入将多用户干扰看作可重构的“有效信息”的新思路,提出了一种基于数字信号处理技术的串行反馈干扰抑制算法。搭建了2用户同步接入频谱幅度编码光码分多址(SAC-OCDMA)传输系统仿真平台,验证了该算法抑制多用户干扰的有效性。仿真结果表明:相较于光阈值器件,采用串行反馈干扰抑制算法抑制多用户干扰的效果更好,系统传输性能的改善更大,引入的功率代价仅为2.3 dB。In the multi-user optical code division multiple access(OCDMA)transmission system,multi-user interference(MAI)seriously affects the transmission performance of the system.In view of the fact that the multi-user interference comes from the incomplete orthogonality of codewords,the received signal and the system damage can be expressed by the autocorrelation and the crosscorrelation functions of codewords.A new research idea regarding the multi-user interference as the effective information that can be reconstructed is introduced to suppress the multi-user interference,and a serial feedback interference suppression algorithm based on the digital signal processing technology is proposed.A simulation platform for two users synchronous access spectrum amplitude code optical code division multiple access(SAC-OCDMA)transmission system is built to verify the effectiveness of the algorithm in suppressing the multi-user interference.The simulation results show that compared with the optical threshold device,the serial feedback interference suppression algorithm can suppress the multi-user interference better,the improvement of the system transmission performance is greater,while the power penalty introduced is only 2.3 dB.

关 键 词：光通信 光码分多址系统 多用户干扰 串行反馈干扰抑制算法 

分 类 号：TN929.12[电子电信—通信与信息系统]