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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.
Aiming at the need of maximum Doppler shift estimation of received signal under Rice channel, a traditional Doppler frequency shift estimation method based on level crossover is proposed. The idea of cyclic iteration is introduced to optimize the filter bandwidth at the receiver , The received signal through the optimal filter, and then based on the level of cross-rate Doppler shift estimate, greatly reducing the impact of noise on the estimation performance.Although improved the complexity of the algorithm has improved, but in the Les channel , Which can estimate the Doppler frequency shift of the received signal more accurately than the traditional Doppler frequency shift estimation algorithm. The simulation results verify the effectiveness and superiority of the proposed algorithm.