In order to maintain orthogonality among subcarriers for mobile OFDM,a CFOs step-size estimation model is established to avoid severe performance degradation caused by ICI,and algorithmic stability,step-size parameters,and the errors of CFOs estimation are investigated.First,after an averaging window algorithm is introduced,the mathematic model of step-size estimation algorithm is obtained through step-size parameter and time-varying CFOs.Then,based on the results of simulation referred to MATLAB,the determ...