Hu, X.; Wang, Y.; Wu, F., and Huang, A., 2021. Using a new channel estimation algorithm to improve underwater acoustic communication with multiple receivers. Journal of Coastal Research, 37(4), 779–783. Coconut Creek (Florida), ISSN 0749-0208.

Underwater acoustic (UWA) communication with multiple receivers has been developed for underwater wireless data transmission, because the receiving array can improve the reliability of the system by using spatial diversity. In this paper, a channel estimation algorithm is proposed that fully uses UWA channel sparsity for single-input, multiple-output (SIMO) communication. The proposed algorithm integrates L₀ norm into the cost function of the improved proportionate normalized least-mean-square (IPNLMS) algorithm based on L₀ norm. The performance of the L₀ norm–constrained IPNLMS, IPNLMS based on L₀ norm, and the proposed algorithm is studied in terms of normalized misalignment for SIMO UWA channel estimation. In addition, the influence of the number of receivers on channel estimation accuracy is analyzed. Finally, the numerical simulation results demonstrate the superiority of the proposed algorithm in terms of robustness, which achieves the lower normalized misalignment than the other two algorithms in a shallow-water acoustic channel estimation.