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Summary: Symbol by Symbol Doppler Rate Estimation for
Highly Mobile Underwater OFDM
Nathan Parrish, Sumit Roy
Department of Electrical Engineering
University of Washington
Seattle, Washington 98195
Email: nparrish,sroy@u.washington.edu
Payman Arabshahi
Applied Physics Laboratory
University of Washington
Seattle, Washington 98105
Email: payman@apl.washington.edu
Abstract--We 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. We propose two
methods of estimation: one of which is based upon the marginal
maximum likelihood principle, and one of which is ad-hoc. We
compare the performance of both estimators to the Cramer-Rao
lower bound. We show through simulation that the proposed
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