Doppler parameter estimation method based on improved SAGE

The invention relates to a Doppler parameter estimation method based on improved SAGE, and the method comprises the steps: carrying out the reasonable assumption of a probability density function of a Doppler power spectrum through employing the prior information of scatterer distribution in a channel; initial value setting and hierarchical estimation are carried out on multipath Doppler parameters in the SAGE algorithm based on the prior probability distribution of the Doppler frequency, and multipath components in an interval with high Doppler frequency prior probability are preferentially estimated. Compared with the prior art, the method has the advantages that the influence of the periodic continuation part in the likelihood spectrum on the estimation process is reduced by exchanging the multipath estimation sequence, and the reliability is high. 本发明涉及一种基于改进SAGE的多普勒参数估计方法，该方法通过利用信道中散射体分布的先验信息，对多普勒功率谱的概率密度函数进行合理假设，并基于多普勒频率的先验概率分布对SAGE算法中多径的多普勒参数进行初始值设置及分层估计，优先估计多普勒频率先验概率高的区间内的多径分量。与现有技术相比，本发明通过交换多径的估计顺序，减