Patent ID: 7859944

Claim:
A method for mitigating Doppler distortions in a received multi-carrier based underwater acoustic (UWA) signal, the method comprising the steps of: (a) receiving a multi-carrier based UWA signal in a distorted condition, wherein the multi-carrier based UWA signal includes one or more packets and wherein each of the one or more packets includes one or more data blocks; and (b) processing the received multi-carrier based UWA signal to compensate for the distorted condition and restore the multi-carrier based UWA signal to an approximate original condition, wherein processing of the received multi-carrier based UWA signal includes: i. estimating the Doppler scale for each packet, ii. using the Doppler scale estimations to resample the multi-carrier based UWA signal for non-uniform Doppler compensation, iii. estimating the carrier frequency offset (CFO) on a block by block basis to generate a plurality of different CFO estimations, and iv. using the plurality of different CFO estimations for high-resolution uniform compensation of residual Doppler effects for inter-carrier interference (ICI) reduction.