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The authors propose an OFDM-receiver capable of estimating and correcting, on a symbol-by-symbol basis, the subcarrier dependent Doppler shifting due to the movement of source and receiver in an underwater acoustic network. They propose two methods of estimation: one of which is based upon the marginal maximum likelihood principle, and one of which is ad-hoc. They compare the performance of both estimators to the Cramer-Rao lower bound. The wideband modulation scheme Orthogonal Frequency Division Multiplexing (OFDM) has recently generated much interest in the context of underwater acoustic communications for its potential to increase achievable data rates.
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