高速移动场景下抗多普勒频偏同步方法  

Anti-doppler frequency shift synchronization method in high-speed mobile scene

作　　者：王黎阳 翟旭平[1] 杜翀[2] WANG Liyang;ZHAI Xuping;DU Chong(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200072,China;Shanghai Research Center of Urban Public Safety,Shanghai Advanced Research Institute of Chinese Academic of China,Shanghai 201210,China)

机构地区：[1]上海大学特种光纤与光接入网重点实验室,上海200072 [2]中国科学院上海高等研究院城市公共安全研究中心,上海201210

出　　处：《电视技术》2019年第3期55-60,共6页Video Engineering

基　　金：中国科学院重点部署项目资助(KFZD-SW-310)

摘　　要：针对高超音速航空通信中,无线传输信号受到多普勒频偏影响,同步接收难度增大的问题,通过详细分析多普勒频移影响接收信号同步门限的原理,提出了一种对多普勒频偏敏感度较低的分段同步方法。仿真结果表明,改进的同步方法具有更大的判决容限,使得同步接收判决准确性显著提高。同时,为了减少多普勒频偏对数据解调的影响,采用特殊结构的前导序列,提出了一种分段求估计,估计求平均的频偏估计方法,提高了频偏估计的准确性。In hypersonic communication,wireless transmission signals are affected by Doppler frequency shift,which increases the difficulty of synchronization.To solve this problem,we propose a piecewise synchronization method with low sensitivity to Doppler frequency shift by analyzing the principle of Doppler frequency shift affecting the synchronization threshold in detail.The simulation results show that the improved synchronization method has wider tolerance,and the accuracy of the synchronization decision is significantly improved.Moreover,in order to reduce the effect of Doppler frequency shift on the data demodulation,we propose a subsection frequency shift estimation method by adopting a special structure of the preamble,which improves the accuracy of frequency shift estimation.

关 键 词：同步方法 多普勒频偏 同步门限 频偏估计 

分 类 号：TN917.1[电子电信—通信与信息系统]