Traditional Doppler algorithm is not robust to the fast-varying Under Water Acoustic(UWA)Orthogonal Frequency Division Multiplying(OFDM) systems.To overcome the shortcoming,an efficient Doppler estimation algorithm was proposed for the system.First,the sample rate conversion was completed using oversampling and linear interpolation methods.Then,the accurate Doppler shift was acquired by combining the candidate value of Doppler factor.Simulation results show that the proposed algorithm can not only ensure th...