导频辅助的突发信号多普勒频偏及变化率联合估计  

Pilot-aided Joint Estimation of Doppler Shift and Doppler Rate for Burst Transmission

作　　者：刘洋[1] LIU Yang(Southwest China Institute of Electronic Technology,Chengdu 610036,China)

机构地区：[1]中国西南电子技术研究所,成都610036

出　　处：《电讯技术》2024年第7期1115-1122,共8页Telecommunication Engineering

基　　金：国家自然科学基金国际(地区)合作与交流项目(62361136810)。

摘　　要：为了提升高动态突发卫星通信系统多普勒参数估计精度及运算效率,提出了一种基于数据辅助的多普勒频偏及变化率联合估计算法。首先,优化了突发传输帧结构并建立了信号模型;接着,利用导频信号的延迟自相关特性,通过一次离散傅里叶变换(Discrete Fourier Transform,DFT)完成多普勒变化率的快速估计和补偿,实现多普勒变化率动态压缩;最后,利用改进的最大似然估计(Maximum Likelihood Estimation,MLE)离散化实现算法,通过在有限数量多普勒变化率取值上的最大似然值搜索计算,得到最终的多普勒频偏及变化率精确估计值。相较于帧头-帧尾导频估计算法,所提算法的估计性能提高7 dB以上,运算量下降30%。相较于传统MLE离散化实现算法,所提算法的估计性能与之相当,运算量下降99.8%,可为卫星通信系统实现更好的性能与复杂度平衡提供设计参考。To improve the accuracy and efficiency of Doppler parameter estimation for high dynamic burst transmission satellite communication system,a novel joint-estimation algorithm for Doppler shift and Doppler rate based on data-aided method is presented.Firstly,an optimization frame structure of burst transmission is proposed and the corresponding signal model is established.Then,based on the time-delay autocorrelation property of pilot symbols,the fast estimation and compensation for Doppler rate are implemented through one Discrete Fourier Transform(DFT)to accomplish dynamic range compression.Furthermore,an improved discretization method of Maximum Likelihood Estimation(MLE)is proposed to get the final accurate estimation results of Doppler parameters,by searching maximum likelihood value in finite Doppler rate test values.Compared with that of the preamble-postamble pilot estimation algorithm,the estimation performance of the proposed algorithm is improved by more than 7 dB,and the computational complexity is reduced by 30%.Compared with that of the existing discretization method of MLE,the estimation performance of the proposed algorithm is close to its conventional counterparts,and the computational complexity is reduced by 99.8%.The proposed algorithm can provide a reference for achieving a better balance between performance and complexity in satellite communication system design.

关 键 词：卫星移动通信 高动态突发传输 多普勒参数估计 数据辅助 

分 类 号：TN927[电子电信—通信与信息系统]