自适应均衡器在超短波高速数传系统中的应用  

APPLICATION OF ADAPTIVE EQUALIZER IN HIGH-SPEED VHF DATA TRANSMISSION SYSTEM

作　　者：马雯 

机构地区：[1]中国电子科技集团公司第五十研究所,上海200331

出　　处：《南阳理工学院学报》2017年第4期5-8,36,共5页Journal of Nanyang Institute of Technology

摘　　要：为满足超短波(VHF)频段高速数据传输的需求,将π/4 DQPSK调制与自适应均衡技术相结合。基于VHF信道特性,并综合考虑性能及复杂度因素,选用自适应判决反馈均衡器结构,并采用递归最小二乘算法实现快速收敛。仿真结果表明,采用低阶均衡器,在实测多径信道模型下可获得良好的接收性能,但在扩展多径信道模型下接收性能有所下降。实际应用中,应根据传输距离及具体的无线传播环境,合理设置均衡器的抽头个数。To meet the requirement of high-speed data transmission in VHF band,DQPSK modulation is combined with adaptive equalization technique. Based on the characteristics of VHF channel,and factors of performance and complexity,the adaptive decision feedback equalizer（ DFE） is adopted and the recursive least square algorithm is used. The simulation results show that,when setting only a few stages in the equalizer,good performance can be obtained with measured VHF channel models,while such good performance can＇t be obtained with expanded VHF channel models. In real applications,the stage number of DFE should be set properly according to transmission distance and wireless propagation environment.

关 键 词：超短波信道 高速数据传输 判决反馈均衡器 递归最小二乘 

分 类 号：TN914.3[电子电信—通信与信息系统]