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One of the major problem in applying OFDM to underwater channels is that it is vulnerable to carrier frequency offset (CFO) caused by transceiver mismatch and/or Doppler shifts. And the loss of orthogonality due to the CFO effects must be compensated before the demodulation with discrete Fourier transform. This paper proposes a novel CFO estimation technique for OFDM communications over an underwater acoustic channel. We exploit the intrinsic structure information of OFDM signals to derive a CFO 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.