基于导频结构的遥测时变信道均衡技术  

An Telemetry Adaptive Equalization Algorithm Against Multipath Effect Based on Pilot Training

作　　者：许琬琳 赵岭[1] 贾冒华 雷永刚 XU Wanlin;ZHAO Ling;JIA Maohua;LEI Yonggang(School of Electronic and Information Engineering,Beihang University,Beijing 100191,China;Beijing Institute of Radio Measurement and Testing,Beijing 100854,China;Beijing Institute of Tracking and Communication Technology,Beijing 100094,China)

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191 [2]北京无线电计量测试研究所,北京100854 [3]北京跟踪与通信技术研究所,北京100094

出　　处：《无线电通信技术》2023年第5期905-911,共7页Radio Communications Technology

基　　金：北京市自然科学基金(L202003)。

摘　　要：信道均衡(Channel Equalization,CE)技术作为一种高效抗多径方法,在卫星通信领域有着广泛的应用价值。为提高均衡算法性能,提出一种基于面向判决的最小均方(Decision-Directed Least Mean Square,DD-LMS)算法及判决反馈均衡(Decision Feedback Equalizer,DFE)算法的自适应均衡技术。该技术基于导频训练序列方案及最小二乘法进行信道估计,在时域对畸变码元进行补偿;基于信号传输速率及信道特性设置导频数据结构,自适应切换信道均衡模式及步长因子,实现最优均衡性能。在遥测多径衰落信道下,该自适应均衡算法误码率为10^(-5)时约有0.5 dB增益,具有良好的系统稳定性。为满足实际应用需求,基于现场可编程门阵列(Field Programmable Gate Array,FPGA)平台进行实现,仿真及实测结果验证了该算法的有效性。As an efficient anti-multipath method,Channel Equalization(CE) technology has high application value in satellite communication.In order to improve the performance of equalization algorithm,this paper proposes a Decision-Directed Least Mean Square(DD-LMS) algorithm and Decision Feedback Equalizer(DFE) adaptive equalization technology.The technique is based on pilot training sequence scheme and least square method for channel estimation,so as to compensate the distortion element in time domain.Based on signal transmission rate and channel characteristics,the pilot data structure is set,and the channel balancing mode and step factor are adaptively switched to achieve optimal balancing performance.The adaptive equalization algorithm has a gain of about 0.5 dB when the bit error rate is 10~(-5),and provides good system stability under the telemetry multipath fading channel.In order to meet practical application requirements,it is implemented based on a Field Programmable Gate Array(FPGA) platform.Simulation and measurement results verify the effectiveness of the algorithm.

关 键 词：导频训练 抗多径衰落技术 自适应信道均衡 最小均方算法 现场可编程门阵列 

分 类 号：TN911.5[电子电信—通信与信息系统]