Research on the Doppler Shift Mitigation Scheme for OFDM Underwater Acoustic Communication

Abstract:

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Doppler shift decreases the estimation accuracy of carrier frequency and may result in divergent estimation. It thus degrades the performance of orthogonal frequency division multiplexing (OFDM) underwater acoustic (UWA) communication system. In this paper, the two-step Doppler shift mitigation scheme[4] was adopted to mitigate the Doppler effect. The innovation lied in the second step in which an enhanced carrier frequency offset (CFO) two-time estimation approach on basis of the pilot was proposed to improve the Doppler shift mitigation scheme. In addition, the new Doppler shift mitigation scheme with the proposed approach was implemented in the OFDM communication system under the simulated multipath-spread channel environment. The experiment results show that the new scheme is able to improve the performance of OFDM UWA communication significantly.

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Periodical:

Edited by:

Robin G. Qiu and Yongfeng Ju

Pages:

820-825

DOI:

10.4028/www.scientific.net/AMM.135-136.820

Citation:

Q. W. Chang et al., "Research on the Doppler Shift Mitigation Scheme for OFDM Underwater Acoustic Communication", Applied Mechanics and Materials, Vols. 135-136, pp. 820-825, 2012

Online since:

October 2011

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$38.00

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