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Time-Varying Channel Equalization in Underwater Acoustic OFDM Communication System

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Abstract

In this paper, three time-varying channel equalization schemes are studied in the underwater acoustic (UWA) Orthogonal Frequency Division Multiplexing (OFDM) communication system. The equalization algorithms are the zero-forcing (ZF) equalization algorithm, and the minimum mean square error equalization (MMSE) algorithm and the serial interference cancellation (SIC) equalization algorithm. Among the schemes, there is a problem of needing a large amount of operation when obtaining the inversion of the channel matrix. Then, to reduce the computation complexity of channel matrix inversion, the band approximation of the channel matrix, the serial equalization and the LDLH decomposition are also studied. To evaluate the efficacy of the algorithms studied in this paper, numerical simulation and the field experiment are both conducted. The simulation results proof that each equalization algorithm can work appropriately under different time-varying conditions, and valid the reliability of each simplified algorithm under the same Doppler factor. The results of two sets of field experiment also prove that the simplified algorithm eliminates the influence of the residual narrow band Doppler to a certain extent, and a better effect is obtained while a channel estimation algorithm with higher accuracy is combined.

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Authors and Affiliations

  1. North China University of Water Resources and Electric Power, Zhengzhou, China

    Anfu Zhu

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  1. Anfu Zhu
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Correspondence to Anfu Zhu.

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Anfu Zhu

The author declares that he has no conflict of interest.

The initial version of this paper in Russian is published in the journal “Izvestiya Vysshikh Uchebnykh Zavedenii. Radioelektronika,” ISSN 2307-6011 (Online), ISSN 0021-3470 (Print) on the link http://radio.kpi.ua/article/view/S0021347020080038 with DOI: https://doi.org/10.20535/S0021347020080038

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Zhu, A. Time-Varying Channel Equalization in Underwater Acoustic OFDM Communication System. Radioelectron.Commun.Syst. 63, 405–417 (2020). https://doi.org/10.3103/S0735272720080038

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