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Joint Equalization and Decoding Scheme Using Modified Spinal Codes for Underwater Communications

Abstract : Intersymbol interference (ISI) cancellation over frequency-selective underwater acoustic channel (UAC) is usually performed efficiently using iterative equalization. To this aim, an interleaver is required between the error correction scheme and the modulation scheme, and the longer the interleaver block length the better the performance. However, in the case of time-varying UAC, the length of the interleaver should not be longer than the channel coherence time, thus limiting the performance. Hence, for time-varying UAC with a low coherence time, small interleaver block length have to be used. In this paper, we propose a small block length coding scheme and its associate joint equalization and decoding algorithm based on Spinal codes. We show its efficiency over static large delay spread channels and static UAC: more precisely, simulation results show that the proposed scheme achieves a higher bit error rate than the Turbo equalization scheme with the same block length, especially for high spectral efficiency modulations. Simulations of proposed scheme over UAC obtained from underwater sea experiments are also presented which show the promising performances.
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https://hal.archives-ouvertes.fr/hal-01424505
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Submitted on : Friday, June 11, 2021 - 8:59:39 AM
Last modification on : Monday, October 11, 2021 - 2:23:44 PM
Long-term archiving on: : Sunday, September 12, 2021 - 6:22:53 PM

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Yupeng Tai, Frédéric Guilloud, Christophe Laot, Raphaël Le Bidan, Hai-Bin Wang. Joint Equalization and Decoding Scheme Using Modified Spinal Codes for Underwater Communications. OCEANS 2016 - Monterey : MTS/IEEE international conference, Sep 2016, Monterey, United States. pp.1 - 6, ⟨10.1109/OCEANS.2016.7761418⟩. ⟨hal-01424505⟩

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