Doppler estimation based on signal phase matching principle in wideband OFDM

Major problem in applying OFDM to underwater channels is the motion-induced Doppler distortion which creates non-uniform frequency offset in the case of a wideband acoustic signal. And the loss of orthogonality due to the Doppler effects must be compensated before the demodulation with discrete Fourier transform. This paper proposes a novel Doppler estimation technique for OFDM communications over an underwater acoustic channel. We exploit the intrinsic structure information of OFDM signals to derive a Doppler estimator based on signal-phase-matching (SPM) principle. Simulation results show that the main advantages of the proposed technique are its computation simplicity and high accuracy.