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Derivation of a Low-Complexity-Pilot-Aided Doppler estimator for underwater acoustic applicationsa)
Ali M Bassam1,2, Mae L Seto1,2
1Department of Mechanical Engineering, Dalhousie University, Halifax, Nova Scotia, Canada.
Abstract:
A time-domain Doppler estimation method is developed using shift-orthogonal pilot sequences in underwater acoustic (UWA) orthogonal frequency division multiplexing systems. The derivation uses channel assumptions that cover a wide class of UWA communication environments. The proposed estimator is computationally lightweight, targeting applications with limited on-board processing power. Asymptotic analysis for high signal-to-noise ratios and a Cramer-Rao lower bound are presented. Although it is sub-optimal and is outperformed by some estimators, the proposed estimator outperforms many existing estimators found in the literature (in terms of mean square error).
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