Invited Papers from the 12th International Conference on Theoretical and Computational Acoustics (ICTCA 2015); Guest Editor: Yuefeng SunNo Access

A Combined Doppler Scale Estimation Scheme for Underwater Acoustic OFDM System

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- Erratum: A Combined Doppler Scale Estimation Scheme for Underwater Acoustic OFDM System

Lu Ma

Acoustic Science and Technology Laboratory, and College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin, Heilongjiang Province, P. R. China

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Gang Qiao

Acoustic Science and Technology Laboratory, and College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin, Heilongjiang Province, P. R. China

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, and

Songzuo Liu

Acoustic Science and Technology Laboratory, and College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin, Heilongjiang Province, P. R. China

E-mail Address: liusongzuo@hrbeu.edu.cn

Corresponding author.

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https://doi.org/10.1142/S0218396X15400044Cited by:16 (Source: Crossref)

Abstract

Since the performance of orthogonal frequency division multiplexing (OFDM) system is severely limited by frequency-dependent Doppler shifts over underwater acoustic (UWA) channels, a combined Doppler scale estimation scheme is proposed, containing two steps: (1) the initial Doppler scale estimation via transmitting two identical short OFDM symbols preceded by a cyclic prefix (CP) as a preamble prior to the data transmission; and (2) fine synchronization and Doppler scale estimation for each CP-OFDM block are achieved by the CP-based method, and eventually the resampling methodology is adopted for nonuniform Doppler shifts compensation. The proposed scheme has been tested with real data from the Songhua Lake experiment where the transmitter is moving at a speed of about 2.5 m/s, and the Yellow sea trial in which the transmitter and receiver are floating freely with waves and currents. Excellent performance results are obtained by block-by-block processing, without buffering the whole packet, which is suitable for real-time receiver processing over time-varying UWA channels.

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