基于电平交叉率的多普勒频移估计方法

Doppler frequency shift estimation method based on level crossing rate

针对在莱斯信道下对接收信号进行最大多普勒频移估计的需求,提出基于电平交叉率的传统多普勒频移估计方法,引入循环迭代的思想使得接收端的滤波器带宽达到最优,接收信号通过最优滤波后,再进行基于电平交叉率的多普勒频移估计,大大减缓了噪声对估计性能的影响.改进算法的复杂度虽然有所提高,但在莱斯信道下,其比传统的多普勒频移估计算法更能准确估计出接收信号的多普勒频移,仿真结果验证了算法的有效性和优越性.

According to the demand of maximum Doppler frequency estimation on the received signal in the Rice channel,on the basis of the tradition Doppler frequency shift estimation method based on the level crossing rate,a iterative design was introduced to make the bandwidth of the receiving filter achieve optimal,then the Doppler frequency shift was estimated based on the level crossing rate after the received signal through filtering optimally,which slowed down the effect of noise on the performance of estimation greatly.The complexity of the novel method has increased,but the novel method can estimate the frequency shift more accurately than the tradition method in the Rice channel.Simulation results show that the method can estimate the Doppler frequency shift accurately and effecti-vely.